/* GTK - The GIMP Toolkit * Copyright (C) 1995-1999 Peter Mattis, Spencer Kimball and Josh MacDonald * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS * file for a list of people on the GTK+ Team. See the ChangeLog * files for a list of changes. These files are distributed with * GTK+ at ftp://ftp.gtk.org/pub/gtk/. */ #include "gdkconfig.h" #include "gdk/gdkkeysyms.h" #include "gtkdnd.h" #include "gtkimage.h" #include "gtkinvisible.h" #include "gtkmain.h" #include "gtkstock.h" #include "gtkwindow.h" static GSList *source_widgets = NULL; typedef struct _GtkDragSourceSite GtkDragSourceSite; typedef struct _GtkDragSourceInfo GtkDragSourceInfo; typedef struct _GtkDragDestSite GtkDragDestSite; typedef struct _GtkDragDestInfo GtkDragDestInfo; typedef struct _GtkDragAnim GtkDragAnim; typedef struct _GtkDragFindData GtkDragFindData; typedef enum { GTK_DRAG_STATUS_DRAG, GTK_DRAG_STATUS_WAIT, GTK_DRAG_STATUS_DROP } GtkDragStatus; struct _GtkDragSourceSite { GdkModifierType start_button_mask; GtkTargetList *target_list; /* Targets for drag data */ GdkDragAction actions; /* Possible actions */ /* Drag icon */ GtkImageType icon_type; union { GtkImagePixmapData pixmap; GtkImagePixbufData pixbuf; GtkImageStockData stock; } icon_data; GdkBitmap *icon_mask; GdkColormap *colormap; /* Colormap for drag icon */ /* Stored button press information to detect drag beginning */ gint state; gint x, y; }; struct _GtkDragSourceInfo { GtkWidget *widget; GtkTargetList *target_list; /* Targets for drag data */ GdkDragAction possible_actions; /* Actions allowed by source */ GdkDragContext *context; /* drag context */ GtkWidget *icon_window; /* Window for drag */ GtkWidget *fallback_icon; /* Window for drag used on other screens */ GtkWidget *ipc_widget; /* GtkInvisible for grab, message passing */ GdkCursor *cursor; /* Cursor for drag */ gint hot_x, hot_y; /* Hot spot for drag */ gint button; /* mouse button starting drag */ GtkDragStatus status; /* drag status */ GdkEvent *last_event; /* motion event waiting for response */ gint start_x, start_y; /* Initial position */ gint cur_x, cur_y; /* Current Position */ GdkScreen *cur_screen; /* Current screen for pointer */ guint32 grab_time; /* timestamp for initial grab */ GList *selections; /* selections we've claimed */ GtkDragDestInfo *proxy_dest; /* Set if this is a proxy drag */ guint drop_timeout; /* Timeout for aborting drop */ guint destroy_icon : 1; /* If true, destroy icon_window */ guint have_grab : 1; /* Do we still have the pointer grab */ }; struct _GtkDragDestSite { GtkDestDefaults flags; GtkTargetList *target_list; GdkDragAction actions; GdkWindow *proxy_window; GdkDragProtocol proxy_protocol; guint do_proxy : 1; guint proxy_coords : 1; guint have_drag : 1; }; struct _GtkDragDestInfo { GtkWidget *widget; /* Widget in which drag is in */ GdkDragContext *context; /* Drag context */ GtkDragSourceInfo *proxy_source; /* Set if this is a proxy drag */ GtkSelectionData *proxy_data; /* Set while retrieving proxied data */ guint dropped : 1; /* Set after we receive a drop */ guint32 proxy_drop_time; /* Timestamp for proxied drop */ guint proxy_drop_wait : 1; /* Set if we are waiting for a * status reply before sending * a proxied drop on. */ gint drop_x, drop_y; /* Position of drop */ }; #define DROP_ABORT_TIME 300000 #define ANIM_STEP_TIME 50 #define ANIM_STEP_LENGTH 50 #define ANIM_MIN_STEPS 5 #define ANIM_MAX_STEPS 10 struct _GtkDragAnim { GtkDragSourceInfo *info; gint step; gint n_steps; }; struct _GtkDragFindData { gint x; gint y; GdkDragContext *context; GtkDragDestInfo *info; gboolean found; gboolean toplevel; gboolean (*callback) (GtkWidget *widget, GdkDragContext *context, gint x, gint y, guint32 time); guint32 time; }; /* Enumeration for some targets we handle internally */ enum { TARGET_MOTIF_SUCCESS = 0x40000000, TARGET_MOTIF_FAILURE, TARGET_DELETE }; /* Drag icons */ static GdkPixmap *default_icon_pixmap = NULL; static GdkPixmap *default_icon_mask = NULL; static GdkColormap *default_icon_colormap = NULL; static gint default_icon_hot_x; static gint default_icon_hot_y; /* Forward declarations */ static void gtk_drag_get_event_actions (GdkEvent *event, gint button, GdkDragAction actions, GdkDragAction *suggested_action, GdkDragAction *possible_actions); static GdkCursor * gtk_drag_get_cursor (GdkDisplay *display, GdkDragAction action); static GtkWidget *gtk_drag_get_ipc_widget (GdkScreen *screen); static void gtk_drag_release_ipc_widget (GtkWidget *widget); static gboolean gtk_drag_highlight_expose (GtkWidget *widget, GdkEventExpose *event, gpointer data); static void gtk_drag_selection_received (GtkWidget *widget, GtkSelectionData *selection_data, guint32 time, gpointer data); static void gtk_drag_find_widget (GtkWidget *widget, GtkDragFindData *data); static void gtk_drag_proxy_begin (GtkWidget *widget, GtkDragDestInfo *dest_info, guint32 time); static void gtk_drag_dest_realized (GtkWidget *widget); static void gtk_drag_dest_hierarchy_changed (GtkWidget *widget, GtkWidget *previous_toplevel); static void gtk_drag_dest_site_destroy (gpointer data); static void gtk_drag_dest_leave (GtkWidget *widget, GdkDragContext *context, guint time); static gboolean gtk_drag_dest_motion (GtkWidget *widget, GdkDragContext *context, gint x, gint y, guint time); static gboolean gtk_drag_dest_drop (GtkWidget *widget, GdkDragContext *context, gint x, gint y, guint time); static GtkDragDestInfo * gtk_drag_get_dest_info (GdkDragContext *context, gboolean create); static GtkDragSourceInfo *gtk_drag_get_source_info (GdkDragContext *context, gboolean create); static void gtk_drag_clear_source_info (GdkDragContext *context); static void gtk_drag_source_check_selection (GtkDragSourceInfo *info, GdkAtom selection, guint32 time); static void gtk_drag_source_release_selections (GtkDragSourceInfo *info, guint32 time); static void gtk_drag_drop (GtkDragSourceInfo *info, guint32 time); static void gtk_drag_drop_finished (GtkDragSourceInfo *info, gboolean success, guint time); static void gtk_drag_cancel (GtkDragSourceInfo *info, guint32 time); static gint gtk_drag_source_event_cb (GtkWidget *widget, GdkEvent *event, gpointer data); static void gtk_drag_source_site_destroy (gpointer data); static void gtk_drag_selection_get (GtkWidget *widget, GtkSelectionData *selection_data, guint sel_info, guint32 time, gpointer data); static gint gtk_drag_anim_timeout (gpointer data); static void gtk_drag_remove_icon (GtkDragSourceInfo *info); static void gtk_drag_source_info_destroy (GtkDragSourceInfo *info); static void gtk_drag_update (GtkDragSourceInfo *info, GdkScreen *screen, gint x_root, gint y_root, GdkEvent *event); static gint gtk_drag_motion_cb (GtkWidget *widget, GdkEventMotion *event, gpointer data); static gint gtk_drag_key_cb (GtkWidget *widget, GdkEventKey *event, gpointer data); static gint gtk_drag_button_release_cb (GtkWidget *widget, GdkEventButton *event, gpointer data); static gint gtk_drag_abort_timeout (gpointer data); /************************ * Cursor and Icon data * ************************/ #define action_ask_width 16 #define action_ask_height 16 static const guchar action_ask_bits[] = { 0x00, 0x00, 0xfe, 0x7f, 0xfe, 0x1f, 0x06, 0xc0, 0x76, 0xf8, 0xb6, 0xf7, 0xd6, 0xec, 0x66, 0xdb, 0x66, 0xdb, 0x96, 0xec, 0x76, 0xf7, 0x76, 0xfb, 0xf6, 0xfc, 0x72, 0xfb, 0x7a, 0xfb, 0xf8, 0xfc, }; #define action_ask_mask_width 16 #define action_ask_mask_height 16 static const guchar action_ask_mask_bits[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0x8f, 0x07, 0xcf, 0x0f, 0xef, 0x1f, 0xff, 0x3c, 0xff, 0x3c, 0x6f, 0x1f, 0x8f, 0x0f, 0x8f, 0x07, 0x0f, 0x03, 0x8f, 0x07, 0x87, 0x07, 0x07, 0x03, }; #define action_copy_width 16 #define action_copy_height 16 static const guchar action_copy_bits[] = { 0x00, 0x00, 0xfe, 0x7f, 0xfe, 0x1f, 0x06, 0xc0, 0x76, 0xfb, 0x76, 0xfb, 0x76, 0xfb, 0x06, 0x83, 0xf6, 0xbf, 0xf6, 0xbf, 0x06, 0x83, 0x76, 0xfb, 0x76, 0xfb, 0x72, 0xfb, 0x7a, 0xf8, 0xf8, 0xff, }; #define action_copy_mask_width 16 #define action_copy_mask_height 16 static const guchar action_copy_mask_bits[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0x8f, 0x07, 0x8f, 0x07, 0x8f, 0x07, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x8f, 0x07, 0x8f, 0x07, 0x8f, 0x07, 0x87, 0x07, 0x07, 0x00, }; #define action_move_width 16 #define action_move_height 16 static const guchar action_move_bits[] = { 0x00, 0x00, 0xfe, 0x7f, 0xfe, 0x1f, 0x06, 0xc0, 0x96, 0xff, 0x26, 0xff, 0xc6, 0xf8, 0xd6, 0xe3, 0x96, 0x8f, 0xb6, 0xbf, 0x36, 0xc3, 0x76, 0xfb, 0x76, 0xfa, 0xf2, 0xfa, 0xfa, 0xf8, 0xf8, 0xff, }; #define action_move_mask_width 16 #define action_move_mask_height 16 static const guchar action_move_mask_bits[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0x6f, 0x00, 0xff, 0x00, 0xff, 0x07, 0xef, 0x1f, 0xef, 0x7f, 0xcf, 0x7f, 0xcf, 0x3f, 0x8f, 0x07, 0x8f, 0x07, 0x0f, 0x07, 0x07, 0x07, 0x07, 0x00, }; #define action_link_width 16 #define action_link_height 16 static const guchar action_link_bits[] = { 0x00, 0x00, 0xfe, 0x7f, 0xfe, 0x1f, 0x06, 0xc0, 0x36, 0xf8, 0xd6, 0xf7, 0x66, 0xec, 0xa6, 0xe8, 0x26, 0xdf, 0xe6, 0xbd, 0xd6, 0xa7, 0xb6, 0xa8, 0xb6, 0xb1, 0x72, 0xdf, 0xfa, 0xe0, 0xf8, 0xff, }; #define action_link_mask_width 16 #define action_link_mask_height 16 static const guchar action_link_mask_bits[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xcf, 0x07, 0xef, 0x0f, 0xff, 0x1f, 0x7f, 0x1f, 0xff, 0x3f, 0xff, 0x7f, 0xef, 0x7f, 0xcf, 0x77, 0xcf, 0x7f, 0x8f, 0x3f, 0x07, 0x1f, 0x07, 0x00, }; #define action_none_width 16 #define action_none_height 16 static const guchar action_none_bits[] = { 0x00, 0x00, 0xfe, 0x7f, 0xfe, 0x1f, 0x06, 0xc0, 0xf6, 0xff, 0xf6, 0xff, 0xf6, 0xff, 0xf6, 0xff, 0xf6, 0xff, 0xf6, 0xff, 0xf6, 0xff, 0xf6, 0xff, 0xf6, 0xff, 0xf2, 0xff, 0xfa, 0xff, 0xf8, 0xff, }; #define action_none_mask_width 16 #define action_none_mask_height 16 static const guchar action_none_mask_bits[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 0x07, 0x00, 0x07, 0x00, }; #define CURSOR_WIDTH 16 #define CURSOR_HEIGHT 16 static struct { GdkDragAction action; const guchar *bits; const guchar *mask; GdkCursor *cursor; } drag_cursors[] = { { GDK_ACTION_DEFAULT, 0 }, { GDK_ACTION_ASK, action_ask_bits, action_ask_mask_bits, NULL }, { GDK_ACTION_COPY, action_copy_bits, action_copy_mask_bits, NULL }, { GDK_ACTION_MOVE, action_move_bits, action_move_mask_bits, NULL }, { GDK_ACTION_LINK, action_link_bits, action_link_mask_bits, NULL }, { 0 , action_none_bits, action_none_mask_bits, NULL }, }; static const gint n_drag_cursors = sizeof (drag_cursors) / sizeof (drag_cursors[0]); /********************* * Utility functions * *********************/ static void set_can_change_screen (GtkWidget *widget, gboolean can_change_screen) { can_change_screen = can_change_screen != FALSE; g_object_set_data (G_OBJECT (widget), "gtk-dnd-can-change-screen", GUINT_TO_POINTER (can_change_screen)); } static gboolean get_can_change_screen (GtkWidget *widget) { return g_object_get_data (G_OBJECT (widget), "gtk-dnd-can-change-screen") != NULL; } /************************************************************* * gtk_drag_get_ipc_widget: * Return a invisible, off-screen, override-redirect * widget for IPC. * arguments: * * results: *************************************************************/ static GtkWidget * gtk_drag_get_ipc_widget (GdkScreen *screen) { GtkWidget *result; GSList *drag_widgets = g_object_get_data (G_OBJECT (screen), "gtk-dnd-ipc-widgets"); if (drag_widgets) { GSList *tmp = drag_widgets; result = drag_widgets->data; drag_widgets = drag_widgets->next; g_object_set_data (G_OBJECT (screen), "gtk-dnd-ipc-widgets", drag_widgets); g_slist_free_1 (tmp); } else { result = gtk_invisible_new_for_screen (screen); gtk_widget_show (result); } return result; } /*************************************************************** * gtk_drag_release_ipc_widget: * Releases widget retrieved with gtk_drag_get_ipc_widget () * arguments: * widget: the widget to release. * results: ***************************************************************/ static void gtk_drag_release_ipc_widget (GtkWidget *widget) { GdkScreen *screen = gtk_widget_get_screen (widget); GSList *drag_widgets = g_object_get_data (G_OBJECT (screen), "gtk-dnd-ipc-widgets"); drag_widgets = g_slist_prepend (drag_widgets, widget); g_object_set_data (G_OBJECT (screen), "gtk-dnd-ipc-widgets", drag_widgets); } static guint32 gtk_drag_get_event_time (GdkEvent *event) { guint32 tm = GDK_CURRENT_TIME; if (event) switch (event->type) { case GDK_MOTION_NOTIFY: tm = event->motion.time; break; case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: case GDK_BUTTON_RELEASE: tm = event->button.time; break; case GDK_KEY_PRESS: case GDK_KEY_RELEASE: tm = event->key.time; break; case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: tm = event->crossing.time; break; case GDK_PROPERTY_NOTIFY: tm = event->property.time; break; case GDK_SELECTION_CLEAR: case GDK_SELECTION_REQUEST: case GDK_SELECTION_NOTIFY: tm = event->selection.time; break; case GDK_PROXIMITY_IN: case GDK_PROXIMITY_OUT: tm = event->proximity.time; break; default: /* use current time */ break; } return tm; } static void gtk_drag_get_event_actions (GdkEvent *event, gint button, GdkDragAction actions, GdkDragAction *suggested_action, GdkDragAction *possible_actions) { *suggested_action = 0; *possible_actions = 0; if (event) { GdkModifierType state = 0; switch (event->type) { case GDK_MOTION_NOTIFY: state = event->motion.state; break; case GDK_BUTTON_PRESS: case GDK_2BUTTON_PRESS: case GDK_3BUTTON_PRESS: case GDK_BUTTON_RELEASE: state = event->button.state; break; case GDK_KEY_PRESS: case GDK_KEY_RELEASE: state = event->key.state; break; case GDK_ENTER_NOTIFY: case GDK_LEAVE_NOTIFY: state = event->crossing.state; break; default: break; } if ((button == 2 || button == 3) && (actions & GDK_ACTION_ASK)) { *suggested_action = GDK_ACTION_ASK; *possible_actions = actions; } else if (state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK)) { if ((state & GDK_SHIFT_MASK) && (state & GDK_CONTROL_MASK)) { if (actions & GDK_ACTION_LINK) { *suggested_action = GDK_ACTION_LINK; *possible_actions = GDK_ACTION_LINK; } } else if (state & GDK_CONTROL_MASK) { if (actions & GDK_ACTION_COPY) { *suggested_action = GDK_ACTION_COPY; *possible_actions = GDK_ACTION_COPY; } return; } else { if (actions & GDK_ACTION_MOVE) { *suggested_action = GDK_ACTION_MOVE; *possible_actions = GDK_ACTION_MOVE; } return; } } else { *possible_actions = actions; if ((state & (GDK_MOD1_MASK)) && (actions & GDK_ACTION_ASK)) *suggested_action = GDK_ACTION_ASK; else if (actions & GDK_ACTION_COPY) *suggested_action = GDK_ACTION_COPY; else if (actions & GDK_ACTION_MOVE) *suggested_action = GDK_ACTION_MOVE; else if (actions & GDK_ACTION_LINK) *suggested_action = GDK_ACTION_LINK; } } else { *possible_actions = actions; if (actions & GDK_ACTION_COPY) *suggested_action = GDK_ACTION_COPY; else if (actions & GDK_ACTION_MOVE) *suggested_action = GDK_ACTION_MOVE; else if (actions & GDK_ACTION_LINK) *suggested_action = GDK_ACTION_LINK; } return; } static GdkCursor * gtk_drag_get_cursor (GdkDisplay *display, GdkDragAction action) { gint i; for (i = 0 ; i < n_drag_cursors - 1; i++) if (drag_cursors[i].action == action) break; if (drag_cursors[i].cursor != NULL) { if (display != gdk_cursor_get_display (drag_cursors[i].cursor)) { gdk_cursor_unref (drag_cursors[i].cursor); drag_cursors[i].cursor = NULL; } } if (drag_cursors[i].cursor == NULL) { GdkColor bg = { 0, 0xffff, 0xffff, 0xffff }; GdkColor fg = { 0, 0x0000, 0x0000, 0x0000 }; GdkScreen *screen = gdk_display_get_default_screen (display); GdkWindow *window = gdk_screen_get_root_window (screen); GdkPixmap *pixmap = gdk_bitmap_create_from_data (window, (gchar *)drag_cursors[i].bits, CURSOR_WIDTH, CURSOR_HEIGHT); GdkPixmap *mask = gdk_bitmap_create_from_data (window, (gchar *)drag_cursors[i].mask, CURSOR_WIDTH, CURSOR_HEIGHT); drag_cursors[i].cursor = gdk_cursor_new_from_pixmap (pixmap, mask, &fg, &bg, 0, 0); g_object_unref (pixmap); g_object_unref (mask); } return drag_cursors[i].cursor; } /******************** * Destination side * ********************/ /************************************************************* * gtk_drag_get_data: * Get the data for a drag or drop * arguments: * context - drag context * target - format to retrieve the data in. * time - timestamp of triggering event. * * results: *************************************************************/ void gtk_drag_get_data (GtkWidget *widget, GdkDragContext *context, GdkAtom target, guint32 time) { GtkWidget *selection_widget; g_return_if_fail (GTK_IS_WIDGET (widget)); g_return_if_fail (GDK_IS_DRAG_CONTEXT (context)); g_return_if_fail (!context->is_source); selection_widget = gtk_drag_get_ipc_widget (gtk_widget_get_screen (widget)); g_object_ref (context); g_object_ref (widget); g_signal_connect (selection_widget, "selection_received", G_CALLBACK (gtk_drag_selection_received), widget); g_object_set_data (G_OBJECT (selection_widget), "drag-context", context); gtk_selection_convert (selection_widget, gdk_drag_get_selection (context), target, time); } /************************************************************* * gtk_drag_get_source_widget: * Get the widget the was the source of this drag, if * the drag originated from this application. * arguments: * context: The drag context for this drag * results: * The source widget, or NULL if the drag originated from * a different application. *************************************************************/ GtkWidget * gtk_drag_get_source_widget (GdkDragContext *context) { GSList *tmp_list; g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL); g_return_val_if_fail (!context->is_source, NULL); tmp_list = source_widgets; while (tmp_list) { GtkWidget *ipc_widget = tmp_list->data; if (ipc_widget->window == context->source_window) { GtkDragSourceInfo *info; info = g_object_get_data (G_OBJECT (ipc_widget), "gtk-info"); return info ? info->widget : NULL; } tmp_list = tmp_list->next; } return NULL; } /************************************************************* * gtk_drag_finish: * Notify the drag source that the transfer of data * is complete. * arguments: * context: The drag context for this drag * success: Was the data successfully transferred? * time: The timestamp to use when notifying the destination. * results: *************************************************************/ void gtk_drag_finish (GdkDragContext *context, gboolean success, gboolean del, guint32 time) { GdkAtom target = GDK_NONE; g_return_if_fail (GDK_IS_DRAG_CONTEXT (context)); g_return_if_fail (!context->is_source); if (success && del) { target = gdk_atom_intern ("DELETE", FALSE); } else if (context->protocol == GDK_DRAG_PROTO_MOTIF) { target = gdk_atom_intern (success ? "XmTRANSFER_SUCCESS" : "XmTRANSFER_FAILURE", FALSE); } if (target != GDK_NONE) { GtkWidget *selection_widget = gtk_drag_get_ipc_widget (gdk_drawable_get_screen (context->source_window)); g_object_ref (context); g_object_set_data (G_OBJECT (selection_widget), "drag-context", context); g_signal_connect (selection_widget, "selection_received", G_CALLBACK (gtk_drag_selection_received), NULL); gtk_selection_convert (selection_widget, gdk_drag_get_selection (context), target, time); } if (!(success && del)) gdk_drop_finish (context, success, time); } /************************************************************* * gtk_drag_highlight_expose: * Callback for expose_event for highlighted widgets. * arguments: * widget: * event: * data: * results: *************************************************************/ static gboolean gtk_drag_highlight_expose (GtkWidget *widget, GdkEventExpose *event, gpointer data) { gint x, y, width, height; if (GTK_WIDGET_DRAWABLE (widget)) { if (GTK_WIDGET_NO_WINDOW (widget)) { x = widget->allocation.x; y = widget->allocation.y; width = widget->allocation.width; height = widget->allocation.height; } else { x = 0; y = 0; gdk_drawable_get_size (widget->window, &width, &height); } gtk_paint_shadow (widget->style, widget->window, GTK_STATE_NORMAL, GTK_SHADOW_OUT, NULL, widget, "dnd", x, y, width, height); gdk_draw_rectangle (widget->window, widget->style->black_gc, FALSE, x, y, width - 1, height - 1); } return FALSE; } /************************************************************* * gtk_drag_highlight: * Highlight the given widget in the default manner. * arguments: * widget: * results: *************************************************************/ void gtk_drag_highlight (GtkWidget *widget) { g_return_if_fail (GTK_IS_WIDGET (widget)); g_signal_connect_after (widget, "expose_event", G_CALLBACK (gtk_drag_highlight_expose), NULL); gtk_widget_queue_draw (widget); } /************************************************************* * gtk_drag_unhighlight: * Refresh the given widget to remove the highlight. * arguments: * widget: * results: *************************************************************/ void gtk_drag_unhighlight (GtkWidget *widget) { g_return_if_fail (GTK_IS_WIDGET (widget)); g_signal_handlers_disconnect_by_func (widget, gtk_drag_highlight_expose, NULL); gtk_widget_queue_draw (widget); } static void gtk_drag_dest_set_internal (GtkWidget *widget, GtkDragDestSite *site) { GtkDragDestSite *old_site; g_return_if_fail (widget != NULL); /* HACK, do this in the destroy */ old_site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest"); if (old_site) { g_signal_handlers_disconnect_by_func (widget, gtk_drag_dest_realized, old_site); g_signal_handlers_disconnect_by_func (widget, gtk_drag_dest_hierarchy_changed, old_site); } if (GTK_WIDGET_REALIZED (widget)) gtk_drag_dest_realized (widget); g_signal_connect (widget, "realize", G_CALLBACK (gtk_drag_dest_realized), site); g_signal_connect (widget, "hierarchy_changed", G_CALLBACK (gtk_drag_dest_hierarchy_changed), site); g_object_set_data_full (G_OBJECT (widget), "gtk-drag-dest", site, gtk_drag_dest_site_destroy); } /************************************************************* * gtk_drag_dest_set: * Register a drop site, and possibly add default behaviors. * arguments: * widget: * flags: Which types of default drag behavior to use * targets: Table of targets that can be accepted * n_targets: Number of of entries in targets * actions: * results: *************************************************************/ void gtk_drag_dest_set (GtkWidget *widget, GtkDestDefaults flags, const GtkTargetEntry *targets, gint n_targets, GdkDragAction actions) { GtkDragDestSite *site; g_return_if_fail (GTK_IS_WIDGET (widget)); site = g_new (GtkDragDestSite, 1); site->flags = flags; site->have_drag = FALSE; if (targets) site->target_list = gtk_target_list_new (targets, n_targets); else site->target_list = NULL; site->actions = actions; site->do_proxy = FALSE; site->proxy_window = NULL; gtk_drag_dest_set_internal (widget, site); } /************************************************************* * gtk_drag_dest_set_proxy: * Set up this widget to proxy drags elsewhere. * arguments: * widget: * proxy_window: window to which forward drag events * protocol: Drag protocol which the dest widget accepts * use_coordinates: If true, send the same coordinates to the * destination, because it is a embedded * subwindow. * results: *************************************************************/ void gtk_drag_dest_set_proxy (GtkWidget *widget, GdkWindow *proxy_window, GdkDragProtocol protocol, gboolean use_coordinates) { GtkDragDestSite *site; g_return_if_fail (GTK_IS_WIDGET (widget)); g_return_if_fail (!proxy_window || GDK_IS_WINDOW (proxy_window)); site = g_new (GtkDragDestSite, 1); site->flags = 0; site->have_drag = FALSE; site->target_list = NULL; site->actions = 0; site->proxy_window = proxy_window; if (proxy_window) g_object_ref (proxy_window); site->do_proxy = TRUE; site->proxy_protocol = protocol; site->proxy_coords = use_coordinates; gtk_drag_dest_set_internal (widget, site); } /************************************************************* * gtk_drag_dest_unset * Unregister this widget as a drag target. * arguments: * widget: * results: *************************************************************/ void gtk_drag_dest_unset (GtkWidget *widget) { g_return_if_fail (GTK_IS_WIDGET (widget)); g_object_set_data (G_OBJECT (widget), "gtk-drag-dest", NULL); } /** * gtk_drag_dest_get_target_list: * @widget: a #GtkWidget * * Returns the list of targets this widget can accept from * drag-and-drop. * * Return value: the #GtkTargetList, or %NULL if none **/ GtkTargetList* gtk_drag_dest_get_target_list (GtkWidget *widget) { GtkDragDestSite *site; g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL); site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest"); return site ? site->target_list : NULL; } /** * gtk_drag_dest_set_target_list: * @widget: a #GtkWidget that's a drag destination * @target_list: list of droppable targets, or %NULL for none * * Sets the target types that this widget can accept from drag-and-drop. * The widget must first be made into a drag destination with * gtk_drag_dest_set(). **/ void gtk_drag_dest_set_target_list (GtkWidget *widget, GtkTargetList *target_list) { GtkDragDestSite *site; g_return_if_fail (GTK_IS_WIDGET (widget)); site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest"); if (site == NULL) { g_warning ("can't set a target list on a widget until you've called gtk_drag_dest_set() to make the widget into a drag destination"); return; } if (target_list) gtk_target_list_ref (target_list); if (site->target_list) gtk_target_list_unref (site->target_list); site->target_list = target_list; } /************************************************************* * _gtk_drag_dest_handle_event: * Called from widget event handling code on Drag events * for destinations. * * arguments: * toplevel: Toplevel widget that received the event * event: * results: *************************************************************/ void _gtk_drag_dest_handle_event (GtkWidget *toplevel, GdkEvent *event) { GtkDragDestInfo *info; GdkDragContext *context; g_return_if_fail (toplevel != NULL); g_return_if_fail (event != NULL); context = event->dnd.context; info = gtk_drag_get_dest_info (context, TRUE); /* Find the widget for the event */ switch (event->type) { case GDK_DRAG_ENTER: break; case GDK_DRAG_LEAVE: if (info->widget) { gtk_drag_dest_leave (info->widget, context, event->dnd.time); info->widget = NULL; } break; case GDK_DRAG_MOTION: case GDK_DROP_START: { GtkDragFindData data; gint tx, ty; if (event->type == GDK_DROP_START) { info->dropped = TRUE; /* We send a leave here so that the widget unhighlights * properly. */ if (info->widget) { gtk_drag_dest_leave (info->widget, context, event->dnd.time); info->widget = NULL; } } gdk_window_get_origin (toplevel->window, &tx, &ty); data.x = event->dnd.x_root - tx; data.y = event->dnd.y_root - ty; data.context = context; data.info = info; data.found = FALSE; data.toplevel = TRUE; data.callback = (event->type == GDK_DRAG_MOTION) ? gtk_drag_dest_motion : gtk_drag_dest_drop; data.time = event->dnd.time; gtk_drag_find_widget (toplevel, &data); if (info->widget && !data.found) { gtk_drag_dest_leave (info->widget, context, event->dnd.time); info->widget = NULL; } /* Send a reply. */ if (event->type == GDK_DRAG_MOTION) { if (!data.found) gdk_drag_status (context, 0, event->dnd.time); } else if (event->type == GDK_DROP_START && !info->proxy_source) { gdk_drop_reply (context, data.found, event->dnd.time); if ((context->protocol == GDK_DRAG_PROTO_MOTIF) && !data.found) gtk_drag_finish (context, FALSE, FALSE, event->dnd.time); } } break; default: g_assert_not_reached (); } } /** * gtk_drag_dest_find_target: * @widget: drag destination widget * @context: drag context * @target_list: list of droppable targets, or %NULL to use * gtk_drag_dest_get_target_list (@widget). * * Looks for a match between @context->targets and the * @dest_target_list, returning the first matching target, otherwise * returning %GDK_NONE. @dest_target_list should usually be the return * value from gtk_drag_dest_get_target_list(), but some widgets may * have different valid targets for different parts of the widget; in * that case, they will have to implement a drag_motion handler that * passes the correct target list to this function. * * Return value: first target that the source offers and the dest can accept, or %GDK_NONE **/ GdkAtom gtk_drag_dest_find_target (GtkWidget *widget, GdkDragContext *context, GtkTargetList *target_list) { GList *tmp_target; GList *tmp_source = NULL; GtkWidget *source_widget; g_return_val_if_fail (GTK_IS_WIDGET (widget), GDK_NONE); g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), GDK_NONE); g_return_val_if_fail (!context->is_source, GDK_NONE); source_widget = gtk_drag_get_source_widget (context); if (target_list == NULL) target_list = gtk_drag_dest_get_target_list (widget); if (target_list == NULL) return GDK_NONE; tmp_target = target_list->list; while (tmp_target) { GtkTargetPair *pair = tmp_target->data; tmp_source = context->targets; while (tmp_source) { if (tmp_source->data == GUINT_TO_POINTER (pair->target)) { if ((!(pair->flags & GTK_TARGET_SAME_APP) || source_widget) && (!(pair->flags & GTK_TARGET_SAME_WIDGET) || (source_widget == widget))) return pair->target; else break; } tmp_source = tmp_source->next; } tmp_target = tmp_target->next; } return GDK_NONE; } static void gtk_drag_selection_received (GtkWidget *widget, GtkSelectionData *selection_data, guint32 time, gpointer data) { GdkDragContext *context; GtkDragDestInfo *info; GtkWidget *drop_widget; drop_widget = data; context = g_object_get_data (G_OBJECT (widget), "drag-context"); info = gtk_drag_get_dest_info (context, FALSE); if (info->proxy_data && info->proxy_data->target == selection_data->target) { gtk_selection_data_set (info->proxy_data, selection_data->type, selection_data->format, selection_data->data, selection_data->length); gtk_main_quit (); return; } if (selection_data->target == gdk_atom_intern ("DELETE", FALSE)) { gtk_drag_finish (context, TRUE, FALSE, time); } else if ((selection_data->target == gdk_atom_intern ("XmTRANSFER_SUCCESS", FALSE)) || (selection_data->target == gdk_atom_intern ("XmTRANSFER_FAILURE", FALSE))) { /* Do nothing */ } else { GtkDragDestSite *site; site = g_object_get_data (G_OBJECT (drop_widget), "gtk-drag-dest"); if (site && site->target_list) { guint target_info; if (gtk_target_list_find (site->target_list, selection_data->target, &target_info)) { if (!(site->flags & GTK_DEST_DEFAULT_DROP) || selection_data->length >= 0) g_signal_emit_by_name (drop_widget, "drag_data_received", context, info->drop_x, info->drop_y, selection_data, target_info, time); } } else { g_signal_emit_by_name (drop_widget, "drag_data_received", context, info->drop_x, info->drop_y, selection_data, 0, time); } if (site && site->flags & GTK_DEST_DEFAULT_DROP) { gtk_drag_finish (context, (selection_data->length >= 0), (context->action == GDK_ACTION_MOVE), time); } g_object_unref (drop_widget); } g_signal_handlers_disconnect_by_func (widget, gtk_drag_selection_received, data); g_object_set_data (G_OBJECT (widget), "drag-context", NULL); g_object_unref (context); gtk_drag_release_ipc_widget (widget); } static void prepend_and_ref_widget (GtkWidget *widget, gpointer data) { GSList **slist_p = data; *slist_p = g_slist_prepend (*slist_p, g_object_ref (widget)); } /************************************************************* * gtk_drag_find_widget: * Recursive callback used to locate widgets for * DRAG_MOTION and DROP_START events. * arguments: * * results: *************************************************************/ static void gtk_drag_find_widget (GtkWidget *widget, GtkDragFindData *data) { GtkAllocation new_allocation; gint allocation_to_window_x = 0; gint allocation_to_window_y = 0; gint x_offset = 0; gint y_offset = 0; if (data->found || !GTK_WIDGET_MAPPED (widget) || !GTK_WIDGET_SENSITIVE (widget)) return; /* Note that in the following code, we only count the * position as being inside a WINDOW widget if it is inside * widget->window; points that are outside of widget->window * but within the allocation are not counted. This is consistent * with the way we highlight drag targets. * * data->x,y are relative to widget->parent->window (if * widget is not a toplevel, widget->window otherwise). * We compute the allocation of widget in the same coordinates, * clipping to widget->window, and all intermediate * windows. If data->x,y is inside that, then we translate * our coordinates to be relative to widget->window and * recurse. */ new_allocation = widget->allocation; if (widget->parent) { gint tx, ty; GdkWindow *window = widget->window; /* Compute the offset from allocation-relative to * window-relative coordinates. */ allocation_to_window_x = widget->allocation.x; allocation_to_window_y = widget->allocation.y; if (!GTK_WIDGET_NO_WINDOW (widget)) { /* The allocation is relative to the parent window for * window widgets, not to widget->window. */ gdk_window_get_position (window, &tx, &ty); allocation_to_window_x -= tx; allocation_to_window_y -= ty; } new_allocation.x = 0 + allocation_to_window_x; new_allocation.y = 0 + allocation_to_window_y; while (window && window != widget->parent->window) { GdkRectangle window_rect = { 0, 0, 0, 0 }; gdk_drawable_get_size (window, &window_rect.width, &window_rect.height); gdk_rectangle_intersect (&new_allocation, &window_rect, &new_allocation); gdk_window_get_position (window, &tx, &ty); new_allocation.x += tx; x_offset += tx; new_allocation.y += ty; y_offset += ty; window = gdk_window_get_parent (window); } if (!window) /* Window and widget heirarchies didn't match. */ return; } if (data->toplevel || ((data->x >= new_allocation.x) && (data->y >= new_allocation.y) && (data->x < new_allocation.x + new_allocation.width) && (data->y < new_allocation.y + new_allocation.height))) { /* First, check if the drag is in a valid drop site in * one of our children */ if (GTK_IS_CONTAINER (widget)) { GtkDragFindData new_data = *data; GSList *children = NULL; GSList *tmp_list; new_data.x -= x_offset; new_data.y -= y_offset; new_data.found = FALSE; new_data.toplevel = FALSE; /* need to reference children temporarily in case the * ::drag_motion/::drag_drop callbacks change the widget heirarchy. */ gtk_container_forall (GTK_CONTAINER (widget), prepend_and_ref_widget, &children); for (tmp_list = children; tmp_list; tmp_list = tmp_list->next) { if (!new_data.found && GTK_WIDGET_DRAWABLE (tmp_list->data)) gtk_drag_find_widget (tmp_list->data, &new_data); g_object_unref (tmp_list->data); } g_slist_free (children); data->found = new_data.found; } /* If not, and this widget is registered as a drop site, check to * emit "drag_motion" to check if we are actually in * a drop site. */ if (!data->found && g_object_get_data (G_OBJECT (widget), "gtk-drag-dest")) { data->found = data->callback (widget, data->context, data->x - x_offset - allocation_to_window_x, data->y - y_offset - allocation_to_window_y, data->time); /* If so, send a "drag_leave" to the last widget */ if (data->found) { if (data->info->widget && data->info->widget != widget) { gtk_drag_dest_leave (data->info->widget, data->context, data->time); } data->info->widget = widget; } } } } static void gtk_drag_proxy_begin (GtkWidget *widget, GtkDragDestInfo *dest_info, guint32 time) { GtkDragSourceInfo *source_info; GList *tmp_list; GdkDragContext *context; GtkWidget *ipc_widget; if (dest_info->proxy_source) { gdk_drag_abort (dest_info->proxy_source->context, time); gtk_drag_source_info_destroy (dest_info->proxy_source); dest_info->proxy_source = NULL; } ipc_widget = gtk_drag_get_ipc_widget (gtk_widget_get_screen (widget)); context = gdk_drag_begin (ipc_widget->window, dest_info->context->targets); source_info = gtk_drag_get_source_info (context, TRUE); source_info->ipc_widget = ipc_widget; source_info->widget = gtk_widget_ref (widget); source_info->target_list = gtk_target_list_new (NULL, 0); tmp_list = dest_info->context->targets; while (tmp_list) { gtk_target_list_add (source_info->target_list, GDK_POINTER_TO_ATOM (tmp_list->data), 0, 0); tmp_list = tmp_list->next; } source_info->proxy_dest = dest_info; g_signal_connect (ipc_widget, "selection_get", G_CALLBACK (gtk_drag_selection_get), source_info); dest_info->proxy_source = source_info; } static void gtk_drag_dest_info_destroy (gpointer data) { GtkDragDestInfo *info = data; g_free (info); } static GtkDragDestInfo * gtk_drag_get_dest_info (GdkDragContext *context, gboolean create) { GtkDragDestInfo *info; static GQuark info_quark = 0; if (!info_quark) info_quark = g_quark_from_static_string ("gtk-dest-info"); info = g_object_get_qdata (G_OBJECT (context), info_quark); if (!info && create) { info = g_new (GtkDragDestInfo, 1); info->widget = NULL; info->context = context; info->proxy_source = NULL; info->proxy_data = NULL; info->dropped = FALSE; info->proxy_drop_wait = FALSE; g_object_set_qdata_full (G_OBJECT (context), info_quark, info, gtk_drag_dest_info_destroy); } return info; } static GQuark dest_info_quark = 0; static GtkDragSourceInfo * gtk_drag_get_source_info (GdkDragContext *context, gboolean create) { GtkDragSourceInfo *info; if (!dest_info_quark) dest_info_quark = g_quark_from_static_string ("gtk-source-info"); info = g_object_get_qdata (G_OBJECT (context), dest_info_quark); if (!info && create) { info = g_new0 (GtkDragSourceInfo, 1); info->context = context; g_object_set_qdata (G_OBJECT (context), dest_info_quark, info); } return info; } static void gtk_drag_clear_source_info (GdkDragContext *context) { g_object_set_qdata (G_OBJECT (context), dest_info_quark, NULL); } static void gtk_drag_dest_realized (GtkWidget *widget) { GtkWidget *toplevel = gtk_widget_get_toplevel (widget); if (GTK_WIDGET_TOPLEVEL (toplevel)) gdk_window_register_dnd (toplevel->window); } static void gtk_drag_dest_hierarchy_changed (GtkWidget *widget, GtkWidget *previous_toplevel) { GtkWidget *toplevel = gtk_widget_get_toplevel (widget); if (GTK_WIDGET_TOPLEVEL (toplevel) && GTK_WIDGET_REALIZED (toplevel)) gdk_window_register_dnd (toplevel->window); } static void gtk_drag_dest_site_destroy (gpointer data) { GtkDragDestSite *site = data; if (site->proxy_window) g_object_unref (site->proxy_window); if (site->target_list) gtk_target_list_unref (site->target_list); g_free (site); } /* * Default drag handlers */ static void gtk_drag_dest_leave (GtkWidget *widget, GdkDragContext *context, guint time) { GtkDragDestSite *site; site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest"); g_return_if_fail (site != NULL); if (site->do_proxy) { GtkDragDestInfo *info = gtk_drag_get_dest_info (context, FALSE); if (info->proxy_source && info->proxy_source->widget == widget && !info->dropped) { gdk_drag_abort (info->proxy_source->context, time); gtk_drag_source_info_destroy (info->proxy_source); info->proxy_source = NULL; } return; } else { if ((site->flags & GTK_DEST_DEFAULT_HIGHLIGHT) && site->have_drag) gtk_drag_unhighlight (widget); if (!(site->flags & GTK_DEST_DEFAULT_MOTION) || site->have_drag) g_signal_emit_by_name (widget, "drag_leave", context, time); site->have_drag = FALSE; } } static gboolean gtk_drag_dest_motion (GtkWidget *widget, GdkDragContext *context, gint x, gint y, guint time) { GtkDragDestSite *site; GdkDragAction action = 0; gboolean retval; site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest"); g_return_val_if_fail (site != NULL, FALSE); if (site->do_proxy) { GdkAtom selection; GdkEvent *current_event; GdkWindow *dest_window; GdkDragProtocol proto; GtkDragDestInfo *info = gtk_drag_get_dest_info (context, FALSE); if (!info->proxy_source || info->proxy_source->widget != widget) gtk_drag_proxy_begin (widget, info, time); current_event = gtk_get_current_event (); if (site->proxy_window) { dest_window = site->proxy_window; proto = site->proxy_protocol; } else { gdk_drag_find_window_for_screen (info->proxy_source->context, NULL, gdk_drawable_get_screen (current_event->dnd.window), current_event->dnd.x_root, current_event->dnd.y_root, &dest_window, &proto); } gdk_drag_motion (info->proxy_source->context, dest_window, proto, current_event->dnd.x_root, current_event->dnd.y_root, context->suggested_action, context->actions, time); if (!site->proxy_window && dest_window) g_object_unref (dest_window); selection = gdk_drag_get_selection (info->proxy_source->context); if (selection && selection != gdk_drag_get_selection (info->context)) gtk_drag_source_check_selection (info->proxy_source, selection, time); gdk_event_free (current_event); return TRUE; } if (site->flags & GTK_DEST_DEFAULT_MOTION) { if (context->suggested_action & site->actions) action = context->suggested_action; else { gint i; for (i=0; i<8; i++) { if ((site->actions & (1 << i)) && (context->actions & (1 << i))) { action = (1 << i); break; } } } if (action && gtk_drag_dest_find_target (widget, context, NULL)) { if (!site->have_drag) { site->have_drag = TRUE; if (site->flags & GTK_DEST_DEFAULT_HIGHLIGHT) gtk_drag_highlight (widget); } gdk_drag_status (context, action, time); } else { gdk_drag_status (context, 0, time); return TRUE; } } g_signal_emit_by_name (widget, "drag_motion", context, x, y, time, &retval); return (site->flags & GTK_DEST_DEFAULT_MOTION) ? TRUE : retval; } static gboolean gtk_drag_dest_drop (GtkWidget *widget, GdkDragContext *context, gint x, gint y, guint time) { GtkDragDestSite *site; GtkDragDestInfo *info; site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest"); g_return_val_if_fail (site != NULL, FALSE); info = gtk_drag_get_dest_info (context, FALSE); g_return_val_if_fail (info != NULL, FALSE); info->drop_x = x; info->drop_y = y; if (site->do_proxy) { if (info->proxy_source || (info->context->protocol == GDK_DRAG_PROTO_ROOTWIN)) { gtk_drag_drop (info->proxy_source, time); } else { /* We need to synthesize a motion event, wait for a status, * and, if we get a good one, do a drop. */ GdkEvent *current_event; GdkAtom selection; GdkWindow *dest_window; GdkDragProtocol proto; gtk_drag_proxy_begin (widget, info, time); info->proxy_drop_wait = TRUE; info->proxy_drop_time = time; current_event = gtk_get_current_event (); if (site->proxy_window) { dest_window = site->proxy_window; proto = site->proxy_protocol; } else { gdk_drag_find_window_for_screen (info->proxy_source->context, NULL, gdk_drawable_get_screen (current_event->dnd.window), current_event->dnd.x_root, current_event->dnd.y_root, &dest_window, &proto); } gdk_drag_motion (info->proxy_source->context, dest_window, proto, current_event->dnd.x_root, current_event->dnd.y_root, context->suggested_action, context->actions, time); if (!site->proxy_window && dest_window) g_object_unref (dest_window); selection = gdk_drag_get_selection (info->proxy_source->context); if (selection && selection != gdk_drag_get_selection (info->context)) gtk_drag_source_check_selection (info->proxy_source, selection, time); gdk_event_free (current_event); } return TRUE; } else { gboolean retval; if (site->flags & GTK_DEST_DEFAULT_DROP) { GdkAtom target = gtk_drag_dest_find_target (widget, context, NULL); if (target == GDK_NONE) { gtk_drag_finish (context, FALSE, FALSE, time); return TRUE; } else gtk_drag_get_data (widget, context, target, time); } g_signal_emit_by_name (widget, "drag_drop", context, x, y, time, &retval); return (site->flags & GTK_DEST_DEFAULT_DROP) ? TRUE : retval; } } /*************** * Source side * ***************/ /************************************************************* * gtk_drag_begin: Start a drag operation * * arguments: * widget: Widget from which drag starts * handlers: List of handlers to supply the data for the drag * button: Button user used to start drag * time: Time of event starting drag * * results: *************************************************************/ GdkDragContext * gtk_drag_begin (GtkWidget *widget, GtkTargetList *target_list, GdkDragAction actions, gint button, GdkEvent *event) { GtkDragSourceInfo *info; GList *targets = NULL; GList *tmp_list; guint32 time = GDK_CURRENT_TIME; GdkDragAction possible_actions, suggested_action; GdkDragContext *context; GtkWidget *ipc_widget; g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL); g_return_val_if_fail (GTK_WIDGET_REALIZED (widget), NULL); g_return_val_if_fail (target_list != NULL, NULL); if (event) time = gdk_event_get_time (event); tmp_list = g_list_last (target_list->list); while (tmp_list) { GtkTargetPair *pair = tmp_list->data; targets = g_list_prepend (targets, GINT_TO_POINTER (pair->target)); tmp_list = tmp_list->prev; } ipc_widget = gtk_drag_get_ipc_widget (gtk_widget_get_screen (widget)); source_widgets = g_slist_prepend (source_widgets, ipc_widget); context = gdk_drag_begin (ipc_widget->window, targets); g_list_free (targets); info = gtk_drag_get_source_info (context, TRUE); info->ipc_widget = ipc_widget; g_object_set_data (G_OBJECT (info->ipc_widget), "gtk-info", info); info->widget = gtk_widget_ref (widget); info->button = button; info->target_list = target_list; gtk_target_list_ref (target_list); info->possible_actions = actions; info->cursor = NULL; info->status = GTK_DRAG_STATUS_DRAG; info->last_event = NULL; info->selections = NULL; info->icon_window = NULL; info->destroy_icon = FALSE; gtk_drag_get_event_actions (event, info->button, actions, &suggested_action, &possible_actions); info->cursor = gtk_drag_get_cursor (gtk_widget_get_display (widget), suggested_action); /* Set cur_x, cur_y here so if the "drag_begin" signal shows * the drag icon, it will be in the right place */ if (event && event->type == GDK_MOTION_NOTIFY) { info->cur_screen = gtk_widget_get_screen (widget); info->cur_x = event->motion.x_root; info->cur_y = event->motion.y_root; } else { gdk_display_get_pointer (gtk_widget_get_display (widget), &info->cur_screen, &info->cur_x, &info->cur_y, NULL); } g_signal_emit_by_name (widget, "drag_begin", info->context); if (event && event->type == GDK_MOTION_NOTIFY) gtk_drag_motion_cb (info->ipc_widget, (GdkEventMotion *)event, info); info->start_x = info->cur_x; info->start_y = info->cur_y; g_signal_connect (info->ipc_widget, "button_release_event", G_CALLBACK (gtk_drag_button_release_cb), info); g_signal_connect (info->ipc_widget, "motion_notify_event", G_CALLBACK (gtk_drag_motion_cb), info); g_signal_connect (info->ipc_widget, "key_press_event", G_CALLBACK (gtk_drag_key_cb), info); g_signal_connect (info->ipc_widget, "key_release_event", G_CALLBACK (gtk_drag_key_cb), info); g_signal_connect (info->ipc_widget, "selection_get", G_CALLBACK (gtk_drag_selection_get), info); /* We use a GTK grab here to override any grabs that the widget * we are dragging from might have held */ gtk_grab_add (info->ipc_widget); if (gdk_pointer_grab (info->ipc_widget->window, FALSE, GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_RELEASE_MASK, NULL, info->cursor, time) == 0) { if (gdk_keyboard_grab (info->ipc_widget->window, FALSE, time) != 0) { gtk_drag_cancel (info, time); return NULL; } } info->have_grab = TRUE; info->grab_time = time; return info->context; } /************************************************************* * gtk_drag_source_set: * Register a drop site, and possibly add default behaviors. * arguments: * widget: * start_button_mask: Mask of allowed buttons to start drag * targets: Table of targets for this source * n_targets: * actions: Actions allowed for this source * results: *************************************************************/ void gtk_drag_source_set (GtkWidget *widget, GdkModifierType start_button_mask, const GtkTargetEntry *targets, gint n_targets, GdkDragAction actions) { GtkDragSourceSite *site; g_return_if_fail (GTK_IS_WIDGET (widget)); site = g_object_get_data (G_OBJECT (widget), "gtk-site-data"); gtk_widget_add_events (widget, gtk_widget_get_events (widget) | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_MOTION_MASK); if (site) { if (site->target_list) gtk_target_list_unref (site->target_list); } else { site = g_new0 (GtkDragSourceSite, 1); site->icon_type = GTK_IMAGE_EMPTY; g_signal_connect (widget, "button_press_event", G_CALLBACK (gtk_drag_source_event_cb), site); g_signal_connect (widget, "motion_notify_event", G_CALLBACK (gtk_drag_source_event_cb), site); g_object_set_data_full (G_OBJECT (widget), "gtk-site-data", site, gtk_drag_source_site_destroy); } site->start_button_mask = start_button_mask; if (targets) site->target_list = gtk_target_list_new (targets, n_targets); else site->target_list = NULL; site->actions = actions; } /************************************************************* * gtk_drag_source_unset * Unregister this widget as a drag source. * arguments: * widget: * results: *************************************************************/ void gtk_drag_source_unset (GtkWidget *widget) { GtkDragSourceSite *site; g_return_if_fail (GTK_IS_WIDGET (widget)); site = g_object_get_data (G_OBJECT (widget), "gtk-site-data"); if (site) { g_signal_handlers_disconnect_by_func (widget, gtk_drag_source_event_cb, site); g_signal_handlers_disconnect_by_func (widget, gtk_drag_source_event_cb, site); g_object_set_data (G_OBJECT (widget), "gtk-site-data", NULL); } } static void gtk_drag_source_unset_icon (GtkDragSourceSite *site) { switch (site->icon_type) { case GTK_IMAGE_EMPTY: break; case GTK_IMAGE_PIXMAP: if (site->icon_data.pixmap.pixmap) g_object_unref (site->icon_data.pixmap.pixmap); if (site->icon_mask) g_object_unref (site->icon_mask); break; case GTK_IMAGE_PIXBUF: g_object_unref (site->icon_data.pixbuf.pixbuf); break; case GTK_IMAGE_STOCK: g_free (site->icon_data.stock.stock_id); break; default: g_assert_not_reached(); break; } site->icon_type = GTK_IMAGE_EMPTY; if (site->colormap) g_object_unref (site->colormap); site->colormap = NULL; } /** * gtk_drag_source_set_icon: * @widget: a #GtkWidget * @colormap: the colormap of the icon * @pixmap: the image data for the icon * @mask: the transparency mask for an image. * * Sets the icon that will be used for drags from a particular widget * from a pixmap/mask. GTK+ retains references for the arguments, and * will release them when they are no longer needed. * Use gtk_drag_source_set_icon_pixbuf() instead. **/ void gtk_drag_source_set_icon (GtkWidget *widget, GdkColormap *colormap, GdkPixmap *pixmap, GdkBitmap *mask) { GtkDragSourceSite *site; g_return_if_fail (GTK_IS_WIDGET (widget)); g_return_if_fail (GDK_IS_COLORMAP (colormap)); g_return_if_fail (GDK_IS_PIXMAP (pixmap)); g_return_if_fail (!mask || GDK_IS_PIXMAP (mask)); site = g_object_get_data (G_OBJECT (widget), "gtk-site-data"); g_return_if_fail (site != NULL); g_object_ref (colormap); g_object_ref (pixmap); if (mask) g_object_ref (mask); gtk_drag_source_unset_icon (site); site->icon_type = GTK_IMAGE_PIXMAP; site->icon_data.pixmap.pixmap = pixmap; site->icon_mask = mask; site->colormap = colormap; } /** * gtk_drag_source_set_icon_pixbuf: * @widget: a #GtkWidget * @pixbuf: the #GdkPixbuf for the drag icon * * Sets the icon that will be used for drags from a particular widget * from a #GdkPixbuf. GTK+ retains a reference for @pixbuf and will * release it when it is no longer needed. **/ void gtk_drag_source_set_icon_pixbuf (GtkWidget *widget, GdkPixbuf *pixbuf) { GtkDragSourceSite *site; g_return_if_fail (GTK_IS_WIDGET (widget)); g_return_if_fail (GDK_IS_PIXBUF (pixbuf)); site = g_object_get_data (G_OBJECT (widget), "gtk-site-data"); g_return_if_fail (site != NULL); g_object_ref (pixbuf); gtk_drag_source_unset_icon (site); site->icon_type = GTK_IMAGE_PIXBUF; site->icon_data.pixbuf.pixbuf = pixbuf; } /** * gtk_drag_source_set_icon_stock: * @widget: a #GtkWidget * @stock_id: the ID of the stock icon to use * * Sets the icon that will be used for drags from a particular source * to a stock icon. **/ void gtk_drag_source_set_icon_stock (GtkWidget *widget, const gchar *stock_id) { GtkDragSourceSite *site; g_return_if_fail (GTK_IS_WIDGET (widget)); g_return_if_fail (stock_id != NULL); site = g_object_get_data (G_OBJECT (widget), "gtk-site-data"); g_return_if_fail (site != NULL); gtk_drag_source_unset_icon (site); site->icon_type = GTK_IMAGE_STOCK; site->icon_data.stock.stock_id = g_strdup (stock_id); } static void gtk_drag_get_icon (GtkDragSourceInfo *info, GtkWidget **icon_window, gint *hot_x, gint *hot_y) { if (get_can_change_screen (info->icon_window)) gtk_window_set_screen (GTK_WINDOW (info->icon_window), info->cur_screen); if (gtk_widget_get_screen (info->icon_window) != info->cur_screen) { if (!info->fallback_icon) { gint save_hot_x, save_hot_y; gboolean save_destroy_icon; GtkWidget *save_icon_window; /* HACK to get the appropriate icon */ save_icon_window = info->icon_window; save_hot_x = info->hot_x; save_hot_y = info->hot_x; save_destroy_icon = info->destroy_icon; info->icon_window = NULL; gtk_drag_set_icon_default (info->context); info->fallback_icon = info->icon_window; info->icon_window = save_icon_window; info->hot_x = save_hot_x; info->hot_y = save_hot_y; info->destroy_icon = save_destroy_icon; } gtk_widget_hide (info->icon_window); *icon_window = info->fallback_icon; gtk_window_set_screen (GTK_WINDOW (*icon_window), info->cur_screen); if (!default_icon_pixmap) { *hot_x = -2; *hot_y = -2; } else { *hot_x = default_icon_hot_x; *hot_y = default_icon_hot_y; } } else { if (info->fallback_icon) gtk_widget_hide (info->fallback_icon); *icon_window = info->icon_window; *hot_x = info->hot_x; *hot_y = info->hot_y; } } static void gtk_drag_update_icon (GtkDragSourceInfo *info) { if (info->icon_window) { GtkWidget *icon_window; gint hot_x, hot_y; gtk_drag_get_icon (info, &icon_window, &hot_x, &hot_y); gtk_window_move (GTK_WINDOW (icon_window), info->cur_x - hot_x, info->cur_y - hot_y); if (GTK_WIDGET_VISIBLE (icon_window)) gdk_window_raise (icon_window->window); else gtk_widget_show (icon_window); } } static void gtk_drag_set_icon_window (GdkDragContext *context, GtkWidget *widget, gint hot_x, gint hot_y, gboolean destroy_on_release) { GtkDragSourceInfo *info; info = gtk_drag_get_source_info (context, FALSE); gtk_drag_remove_icon (info); if (widget) gtk_widget_ref (widget); info->icon_window = widget; info->hot_x = hot_x; info->hot_y = hot_y; info->destroy_icon = destroy_on_release; gtk_drag_update_icon (info); } /** * gtk_drag_set_icon_widget: * @context: the context for a drag. (This must be called with a context for the source side of a drag) * @widget: a toplevel window to use as an icon. * @hot_x: the X offset within @widget of the hotspot. * @hot_y: the Y offset within @widget of the hotspot. * * Changes the icon for a widget to a given widget. GTK+ * will not destroy the icon, so if you don't want * it to persist, you should connect to the "drag_end" * signal and destroy it yourself. **/ void gtk_drag_set_icon_widget (GdkDragContext *context, GtkWidget *widget, gint hot_x, gint hot_y) { g_return_if_fail (GDK_IS_DRAG_CONTEXT (context)); g_return_if_fail (context->is_source); g_return_if_fail (GTK_IS_WIDGET (widget)); gtk_drag_set_icon_window (context, widget, hot_x, hot_y, FALSE); } static void icon_window_realize (GtkWidget *window, GdkPixbuf *pixbuf) { GdkPixmap *pixmap; GdkPixmap *mask; gdk_pixbuf_render_pixmap_and_mask_for_colormap (pixbuf, gtk_widget_get_colormap (window), &pixmap, &mask, 128); gdk_window_set_back_pixmap (window->window, pixmap, FALSE); if (mask) gtk_widget_shape_combine_mask (window, mask, 0, 0); g_object_unref (pixmap); if (mask) g_object_unref (mask); } static void set_icon_stock_pixbuf (GdkDragContext *context, const gchar *stock_id, GdkPixbuf *pixbuf, gint hot_x, gint hot_y) { GtkWidget *window; gint width, height; GdkScreen *screen; g_return_if_fail (context != NULL); g_return_if_fail (pixbuf != NULL || stock_id != NULL); g_return_if_fail (pixbuf == NULL || stock_id == NULL); screen = gdk_drawable_get_screen (context->source_window); /* Push a NULL colormap to guard against gtk_widget_push_colormap() */ gtk_widget_push_colormap (NULL); window = gtk_window_new (GTK_WINDOW_POPUP); gtk_window_set_screen (GTK_WINDOW (window), screen); set_can_change_screen (window, TRUE); gtk_widget_pop_colormap (); gtk_widget_set_events (window, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK); gtk_widget_set_app_paintable (GTK_WIDGET (window), TRUE); if (stock_id) { pixbuf = gtk_widget_render_icon (window, stock_id, GTK_ICON_SIZE_DND, NULL); if (!pixbuf) { g_warning ("Cannot load drag icon from stock_id %s", stock_id); gtk_widget_destroy (window); return; } } else g_object_ref (pixbuf); width = gdk_pixbuf_get_width (pixbuf); height = gdk_pixbuf_get_width (pixbuf); gtk_widget_set_size_request (window, gdk_pixbuf_get_width (pixbuf), gdk_pixbuf_get_height (pixbuf)); g_signal_connect_closure (window, "realize", g_cclosure_new (G_CALLBACK (icon_window_realize), pixbuf, (GClosureNotify)g_object_unref), FALSE); gtk_drag_set_icon_window (context, window, hot_x, hot_y, TRUE); } /** * gtk_drag_set_icon_pixbuf: * @context: the context for a drag. (This must be called * with a context for the source side of a drag) * @pixbuf: the #GdkPixbuf to use as the drag icon. * @hot_x: the X offset within @widget of the hotspot. * @hot_y: the Y offset within @widget of the hotspot. * * Sets @pixbuf as the icon for a given drag. **/ void gtk_drag_set_icon_pixbuf (GdkDragContext *context, GdkPixbuf *pixbuf, gint hot_x, gint hot_y) { g_return_if_fail (GDK_IS_DRAG_CONTEXT (context)); g_return_if_fail (context->is_source); g_return_if_fail (GDK_IS_PIXBUF (pixbuf)); set_icon_stock_pixbuf (context, NULL, pixbuf, hot_x, hot_y); } /** * gtk_drag_set_icon_stock: * @context: the context for a drag. (This must be called * with a context for the source side of a drag) * @stock_id: the ID of the stock icon to use for the drag. * @hot_x: the X offset within the icon of the hotspot. * @hot_y: the Y offset within the icon of the hotspot. * * Sets the the icon for a given drag from a stock ID. **/ void gtk_drag_set_icon_stock (GdkDragContext *context, const gchar *stock_id, gint hot_x, gint hot_y) { g_return_if_fail (GDK_IS_DRAG_CONTEXT (context)); g_return_if_fail (context->is_source); g_return_if_fail (stock_id != NULL); set_icon_stock_pixbuf (context, stock_id, NULL, hot_x, hot_y); } /** * gtk_drag_set_icon_pixmap: * @context: the context for a drag. (This must be called * with a context for the source side of a drag) * @colormap: the colormap of the icon * @pixmap: the image data for the icon * @mask: the transparency mask for the icon * @hot_x: the X offset within @pixmap of the hotspot. * @hot_y: the Y offset within @pixmap of the hotspot. * * Sets @pixmap as the icon for a given drag. GTK+ retains * references for the arguments, and will release them when * they are no longer needed. In general, gtk_drag_set_icon_pixbuf() * will be more convenient to use. **/ void gtk_drag_set_icon_pixmap (GdkDragContext *context, GdkColormap *colormap, GdkPixmap *pixmap, GdkBitmap *mask, gint hot_x, gint hot_y) { GtkWidget *window; GdkScreen *screen; gint width, height; g_return_if_fail (GDK_IS_DRAG_CONTEXT (context)); g_return_if_fail (context->is_source); g_return_if_fail (GDK_IS_COLORMAP (colormap)); g_return_if_fail (GDK_IS_PIXMAP (pixmap)); g_return_if_fail (!mask || GDK_IS_PIXMAP (mask)); screen = gdk_colormap_get_screen (colormap); g_return_if_fail (gdk_drawable_get_screen (pixmap) == screen); g_return_if_fail (!mask || gdk_drawable_get_screen (mask) == screen); gdk_drawable_get_size (pixmap, &width, &height); gtk_widget_push_colormap (colormap); window = gtk_window_new (GTK_WINDOW_POPUP); gtk_window_set_screen (GTK_WINDOW (window), screen); set_can_change_screen (window, FALSE); gtk_widget_set_events (window, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK); gtk_widget_set_app_paintable (GTK_WIDGET (window), TRUE); gtk_widget_pop_colormap (); gtk_widget_set_size_request (window, width, height); gtk_widget_realize (window); gdk_window_set_back_pixmap (window->window, pixmap, FALSE); if (mask) gtk_widget_shape_combine_mask (window, mask, 0, 0); gtk_drag_set_icon_window (context, window, hot_x, hot_y, TRUE); } /** * gtk_drag_set_icon_default: * @context: the context for a drag. (This must be called with a context for the source side of a drag) * * Sets the icon for a particular drag to the default * icon. **/ void gtk_drag_set_icon_default (GdkDragContext *context) { g_return_if_fail (GDK_IS_DRAG_CONTEXT (context)); g_return_if_fail (context->is_source); if (!default_icon_pixmap) gtk_drag_set_icon_stock (context, GTK_STOCK_DND, -2, -2); else gtk_drag_set_icon_pixmap (context, default_icon_colormap, default_icon_pixmap, default_icon_mask, default_icon_hot_x, default_icon_hot_y); } /** * gtk_drag_set_default_icon: * @colormap: the colormap of the icon * @pixmap: the image data for the icon * @mask: the transparency mask for an image. * @hot_x: The X offset within @widget of the hotspot. * @hot_y: The Y offset within @widget of the hotspot. * * Changes the default drag icon. GTK+ retains references for the * arguments, and will release them when they are no longer needed. * This function is obsolete. The default icon should now be changed * via the stock system by changing the stock pixbuf for #GTK_STOCK_DND. **/ void gtk_drag_set_default_icon (GdkColormap *colormap, GdkPixmap *pixmap, GdkBitmap *mask, gint hot_x, gint hot_y) { g_return_if_fail (GDK_IS_COLORMAP (colormap)); g_return_if_fail (GDK_IS_PIXMAP (pixmap)); g_return_if_fail (!mask || GDK_IS_PIXMAP (mask)); if (default_icon_colormap) g_object_unref (default_icon_colormap); if (default_icon_pixmap) g_object_unref (default_icon_pixmap); if (default_icon_mask) g_object_unref (default_icon_mask); default_icon_colormap = colormap; g_object_ref (colormap); default_icon_pixmap = pixmap; g_object_ref (pixmap); default_icon_mask = mask; if (mask) g_object_ref (mask); default_icon_hot_x = hot_x; default_icon_hot_y = hot_y; } /************************************************************* * _gtk_drag_source_handle_event: * Called from widget event handling code on Drag events * for drag sources. * * arguments: * toplevel: Toplevel widget that received the event * event: * results: *************************************************************/ void _gtk_drag_source_handle_event (GtkWidget *widget, GdkEvent *event) { GtkDragSourceInfo *info; GdkDragContext *context; g_return_if_fail (widget != NULL); g_return_if_fail (event != NULL); context = event->dnd.context; info = gtk_drag_get_source_info (context, FALSE); if (!info) return; switch (event->type) { case GDK_DRAG_STATUS: { GdkCursor *cursor; if (info->proxy_dest) { if (!event->dnd.send_event) { if (info->proxy_dest->proxy_drop_wait) { gboolean result = context->action != 0; /* Aha - we can finally pass the MOTIF DROP on... */ gdk_drop_reply (info->proxy_dest->context, result, info->proxy_dest->proxy_drop_time); if (result) gdk_drag_drop (info->context, info->proxy_dest->proxy_drop_time); else gtk_drag_finish (info->proxy_dest->context, FALSE, FALSE, info->proxy_dest->proxy_drop_time); } else { gdk_drag_status (info->proxy_dest->context, event->dnd.context->action, event->dnd.time); } } } else if (info->have_grab) { cursor = gtk_drag_get_cursor (gtk_widget_get_display (widget), event->dnd.context->action); if (info->cursor != cursor) { gdk_pointer_grab (widget->window, FALSE, GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_RELEASE_MASK, NULL, cursor, info->grab_time); info->cursor = cursor; } if (info->last_event) { gtk_drag_update (info, info->cur_screen, info->cur_x, info->cur_y, info->last_event); info->last_event = NULL; } } } break; case GDK_DROP_FINISHED: gtk_drag_drop_finished (info, TRUE, event->dnd.time); break; default: g_assert_not_reached (); } } /************************************************************* * gtk_drag_source_check_selection: * Check if we've set up handlers/claimed the selection * for a given drag. If not, add them. * arguments: * * results: *************************************************************/ static void gtk_drag_source_check_selection (GtkDragSourceInfo *info, GdkAtom selection, guint32 time) { GList *tmp_list; tmp_list = info->selections; while (tmp_list) { if (GDK_POINTER_TO_ATOM (tmp_list->data) == selection) return; tmp_list = tmp_list->next; } gtk_selection_owner_set_for_display (gtk_widget_get_display (info->widget), info->ipc_widget, selection, time); info->selections = g_list_prepend (info->selections, GUINT_TO_POINTER (selection)); tmp_list = info->target_list->list; while (tmp_list) { GtkTargetPair *pair = tmp_list->data; gtk_selection_add_target (info->ipc_widget, selection, pair->target, pair->info); tmp_list = tmp_list->next; } if (info->context->protocol == GDK_DRAG_PROTO_MOTIF) { gtk_selection_add_target (info->ipc_widget, selection, gdk_atom_intern ("XmTRANSFER_SUCCESS", FALSE), TARGET_MOTIF_SUCCESS); gtk_selection_add_target (info->ipc_widget, selection, gdk_atom_intern ("XmTRANSFER_FAILURE", FALSE), TARGET_MOTIF_FAILURE); } gtk_selection_add_target (info->ipc_widget, selection, gdk_atom_intern ("DELETE", FALSE), TARGET_DELETE); } /************************************************************* * gtk_drag_drop_finished: * Clean up from the drag, and display snapback, if necessary. * arguments: * info: * success: * time: * results: *************************************************************/ static void gtk_drag_drop_finished (GtkDragSourceInfo *info, gboolean success, guint time) { gtk_drag_source_release_selections (info, time); if (info->proxy_dest) { /* The time from the event isn't reliable for Xdnd drags */ gtk_drag_finish (info->proxy_dest->context, success, FALSE, info->proxy_dest->proxy_drop_time); gtk_drag_source_info_destroy (info); } else { if (success) { gtk_drag_source_info_destroy (info); } else { GtkDragAnim *anim = g_new (GtkDragAnim, 1); anim->info = info; anim->step = 0; anim->n_steps = MAX (info->cur_x - info->start_x, info->cur_y - info->start_y) / ANIM_STEP_LENGTH; anim->n_steps = CLAMP (anim->n_steps, ANIM_MIN_STEPS, ANIM_MAX_STEPS); info->cur_screen = gtk_widget_get_screen (info->widget); gtk_drag_update_icon (info); /* Mark the context as dead, so if the destination decides * to respond really late, we still are OK. */ gtk_drag_clear_source_info (info->context); g_timeout_add (ANIM_STEP_TIME, gtk_drag_anim_timeout, anim); } } } static void gtk_drag_source_release_selections (GtkDragSourceInfo *info, guint32 time) { GdkDisplay *display = gtk_widget_get_display (info->widget); GList *tmp_list = info->selections; while (tmp_list) { GdkAtom selection = GDK_POINTER_TO_ATOM (tmp_list->data); if (gdk_selection_owner_get_for_display (display, selection) == info->ipc_widget->window) gtk_selection_owner_set_for_display (display, NULL, selection, time); tmp_list = tmp_list->next; } g_list_free (info->selections); info->selections = NULL; } /************************************************************* * gtk_drag_drop: * Send a drop event. * arguments: * * results: *************************************************************/ static void gtk_drag_drop (GtkDragSourceInfo *info, guint32 time) { if (info->context->protocol == GDK_DRAG_PROTO_ROOTWIN) { GtkSelectionData selection_data; GList *tmp_list; /* GTK+ traditionally has used application/x-rootwin-drop, but the * XDND spec specifies x-rootwindow-drop. */ GdkAtom target1 = gdk_atom_intern ("application/x-rootwindow-drop", FALSE); GdkAtom target2 = gdk_atom_intern ("application/x-rootwin-drop", FALSE); tmp_list = info->target_list->list; while (tmp_list) { GtkTargetPair *pair = tmp_list->data; if (pair->target == target1 || pair->target == target2) { selection_data.selection = GDK_NONE; selection_data.target = pair->target; selection_data.data = NULL; selection_data.length = -1; g_signal_emit_by_name (info->widget, "drag_data_get", info->context, &selection_data, pair->info, time); /* FIXME: Should we check for length >= 0 here? */ gtk_drag_drop_finished (info, TRUE, time); return; } tmp_list = tmp_list->next; } gtk_drag_drop_finished (info, FALSE, time); } else { if (info->icon_window) gtk_widget_hide (info->icon_window); gdk_drag_drop (info->context, time); info->drop_timeout = g_timeout_add (DROP_ABORT_TIME, gtk_drag_abort_timeout, info); } } /* * Source side callbacks. */ static gint gtk_drag_source_event_cb (GtkWidget *widget, GdkEvent *event, gpointer data) { GtkDragSourceSite *site; gboolean retval = FALSE; site = (GtkDragSourceSite *)data; switch (event->type) { case GDK_BUTTON_PRESS: if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask) { site->state |= (GDK_BUTTON1_MASK << (event->button.button - 1)); site->x = event->button.x; site->y = event->button.y; } break; case GDK_BUTTON_RELEASE: if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask) site->state &= ~(GDK_BUTTON1_MASK << (event->button.button - 1)); break; case GDK_MOTION_NOTIFY: if (site->state & event->motion.state & site->start_button_mask) { /* FIXME: This is really broken and can leave us * with a stuck grab */ int i; for (i=1; i<6; i++) { if (site->state & event->motion.state & GDK_BUTTON1_MASK << (i - 1)) break; } if (gtk_drag_check_threshold (widget, site->x, site->y, event->motion.x, event->motion.y)) { GtkDragSourceInfo *info; GdkDragContext *context; site->state = 0; context = gtk_drag_begin (widget, site->target_list, site->actions, i, event); info = gtk_drag_get_source_info (context, FALSE); if (!info->icon_window) { switch (site->icon_type) { case GTK_IMAGE_EMPTY: gtk_drag_set_icon_default (context); break; case GTK_IMAGE_PIXMAP: gtk_drag_set_icon_pixmap (context, site->colormap, site->icon_data.pixmap.pixmap, site->icon_mask, -2, -2); break; case GTK_IMAGE_PIXBUF: gtk_drag_set_icon_pixbuf (context, site->icon_data.pixbuf.pixbuf, -2, -2); break; case GTK_IMAGE_STOCK: gtk_drag_set_icon_stock (context, site->icon_data.stock.stock_id, -2, -2); break; default: g_assert_not_reached(); break; } } retval = TRUE; } } break; default: /* hit for 2/3BUTTON_PRESS */ break; } return retval; } static void gtk_drag_source_site_destroy (gpointer data) { GtkDragSourceSite *site = data; if (site->target_list) gtk_target_list_unref (site->target_list); gtk_drag_source_unset_icon (site); g_free (site); } static void gtk_drag_selection_get (GtkWidget *widget, GtkSelectionData *selection_data, guint sel_info, guint32 time, gpointer data) { GtkDragSourceInfo *info = data; static GdkAtom null_atom = GDK_NONE; guint target_info; if (!null_atom) null_atom = gdk_atom_intern ("NULL", FALSE); switch (sel_info) { case TARGET_DELETE: g_signal_emit_by_name (info->widget, "drag_data_delete", info->context); gtk_selection_data_set (selection_data, null_atom, 8, NULL, 0); break; case TARGET_MOTIF_SUCCESS: gtk_drag_drop_finished (info, TRUE, time); gtk_selection_data_set (selection_data, null_atom, 8, NULL, 0); break; case TARGET_MOTIF_FAILURE: gtk_drag_drop_finished (info, FALSE, time); gtk_selection_data_set (selection_data, null_atom, 8, NULL, 0); break; default: if (info->proxy_dest) { /* This is sort of dangerous and needs to be thought * through better */ info->proxy_dest->proxy_data = selection_data; gtk_drag_get_data (info->widget, info->proxy_dest->context, selection_data->target, time); gtk_main (); info->proxy_dest->proxy_data = NULL; } else { if (gtk_target_list_find (info->target_list, selection_data->target, &target_info)) { g_signal_emit_by_name (info->widget, "drag_data_get", info->context, selection_data, target_info, time); } } break; } } static gint gtk_drag_anim_timeout (gpointer data) { GtkDragAnim *anim = data; gint x, y; gboolean retval; GDK_THREADS_ENTER (); if (anim->step == anim->n_steps) { gtk_drag_source_info_destroy (anim->info); g_free (anim); retval = FALSE; } else { x = (anim->info->start_x * (anim->step + 1) + anim->info->cur_x * (anim->n_steps - anim->step - 1)) / anim->n_steps; y = (anim->info->start_y * (anim->step + 1) + anim->info->cur_y * (anim->n_steps - anim->step - 1)) / anim->n_steps; if (anim->info->icon_window) { GtkWidget *icon_window; gint hot_x, hot_y; gtk_drag_get_icon (anim->info, &icon_window, &hot_x, &hot_y); gtk_window_move (GTK_WINDOW (icon_window), x - hot_x, y - hot_y); } anim->step++; retval = TRUE; } GDK_THREADS_LEAVE (); return retval; } static void gtk_drag_remove_icon (GtkDragSourceInfo *info) { if (info->icon_window) { gtk_widget_hide (info->icon_window); if (info->destroy_icon) gtk_widget_destroy (info->icon_window); if (info->fallback_icon) { gtk_widget_destroy (info->fallback_icon); info->fallback_icon = NULL; } g_object_unref (info->icon_window); info->icon_window = NULL; } } static void gtk_drag_source_info_destroy (GtkDragSourceInfo *info) { gtk_drag_remove_icon (info); if (!info->proxy_dest) g_signal_emit_by_name (info->widget, "drag_end", info->context); if (info->widget) g_object_unref (info->widget); g_signal_handlers_disconnect_by_func (info->ipc_widget, gtk_drag_button_release_cb, info); g_signal_handlers_disconnect_by_func (info->ipc_widget, gtk_drag_motion_cb, info); g_signal_handlers_disconnect_by_func (info->ipc_widget, gtk_drag_key_cb, info); g_signal_handlers_disconnect_by_func (info->ipc_widget, gtk_drag_selection_get, info); gtk_selection_remove_all (info->ipc_widget); g_object_set_data (G_OBJECT (info->ipc_widget), "gtk-info", NULL); source_widgets = g_slist_remove (source_widgets, info->ipc_widget); gtk_drag_release_ipc_widget (info->ipc_widget); gtk_target_list_unref (info->target_list); gtk_drag_clear_source_info (info->context); g_object_unref (info->context); if (info->drop_timeout) g_source_remove (info->drop_timeout); g_free (info); } /************************************************************* * gtk_drag_update: * Function to update the status of the drag when the * cursor moves or the modifier changes * arguments: * info: DragSourceInfo for the drag * x_root, y_root: position of darg * event: The event that triggered this call * results: *************************************************************/ static void gtk_drag_update (GtkDragSourceInfo *info, GdkScreen *screen, gint x_root, gint y_root, GdkEvent *event) { GdkDragAction action; GdkDragAction possible_actions; GdkWindow *dest_window; GdkDragProtocol protocol; GdkAtom selection; guint32 time = gtk_drag_get_event_time (event); gtk_drag_get_event_actions (event, info->button, info->possible_actions, &action, &possible_actions); info->cur_screen = screen; info->cur_x = x_root; info->cur_y = y_root; gtk_drag_update_icon (info); gdk_drag_find_window_for_screen (info->context, info->icon_window ? info->icon_window->window : NULL, screen, x_root, y_root, &dest_window, &protocol); if (gdk_drag_motion (info->context, dest_window, protocol, x_root, y_root, action, possible_actions, time)) { if (info->last_event != event) /* Paranoia, should not happen */ { if (info->last_event) gdk_event_free ((GdkEvent *)info->last_event); info->last_event = gdk_event_copy ((GdkEvent *)event); } } else { if (info->last_event) { gdk_event_free ((GdkEvent *)info->last_event); info->last_event = NULL; } } if (dest_window) g_object_unref (dest_window); selection = gdk_drag_get_selection (info->context); if (selection) gtk_drag_source_check_selection (info, selection, time); } /************************************************************* * gtk_drag_end: * Called when the user finishes to drag, either by * releasing the mouse, or by pressing Esc. * arguments: * info: Source info for the drag * time: Timestamp for ending the drag * results: *************************************************************/ static void gtk_drag_end (GtkDragSourceInfo *info, guint32 time) { GdkEvent *send_event; GtkWidget *source_widget = info->widget; GdkDisplay *display = gtk_widget_get_display (source_widget); info->have_grab = FALSE; gdk_display_pointer_ungrab (display, time); gdk_display_keyboard_ungrab (display, time); gtk_grab_remove (info->ipc_widget); g_signal_handlers_disconnect_by_func (info->ipc_widget, gtk_drag_button_release_cb, info); g_signal_handlers_disconnect_by_func (info->ipc_widget, gtk_drag_motion_cb, info); g_signal_handlers_disconnect_by_func (info->ipc_widget, gtk_drag_key_cb, info); /* Send on a release pair to the the original * widget to convince it to release its grab. We need to * call gtk_propagate_event() here, instead of * gtk_widget_event() because widget like GtkList may * expect propagation. */ send_event = gdk_event_new (GDK_BUTTON_RELEASE); send_event->button.window = g_object_ref (gtk_widget_get_root_window (source_widget)); send_event->button.send_event = TRUE; send_event->button.time = time; send_event->button.x = 0; send_event->button.y = 0; send_event->button.axes = NULL; send_event->button.state = 0; send_event->button.button = info->button; send_event->button.device = gdk_display_get_core_pointer (display); send_event->button.x_root = 0; send_event->button.y_root = 0; gtk_propagate_event (source_widget, send_event); gdk_event_free (send_event); } /************************************************************* * gtk_drag_cancel: * Called on cancellation of a drag, either by the user * or programmatically. * arguments: * info: Source info for the drag * time: Timestamp for ending the drag * results: *************************************************************/ static void gtk_drag_cancel (GtkDragSourceInfo *info, guint32 time) { gtk_drag_end (info, time); gdk_drag_abort (info->context, time); gtk_drag_drop_finished (info, FALSE, time); } /************************************************************* * gtk_drag_motion_cb: * "motion_notify_event" callback during drag. * arguments: * * results: *************************************************************/ static gint gtk_drag_motion_cb (GtkWidget *widget, GdkEventMotion *event, gpointer data) { GtkDragSourceInfo *info = (GtkDragSourceInfo *)data; GdkScreen *screen; gint x_root, y_root; if (event->is_hint) { GdkDisplay *display = gtk_widget_get_display (widget); gdk_display_get_pointer (display, &screen, &x_root, &y_root, NULL); event->x_root = x_root; event->y_root = y_root; } else screen = gdk_event_get_screen ((GdkEvent *)event); gtk_drag_update (info, screen, event->x_root, event->y_root, (GdkEvent *)event); return TRUE; } /************************************************************* * gtk_drag_key_cb: * "key_press/release_event" callback during drag. * arguments: * * results: *************************************************************/ static gint gtk_drag_key_cb (GtkWidget *widget, GdkEventKey *event, gpointer data) { GtkDragSourceInfo *info = (GtkDragSourceInfo *)data; GdkModifierType state; GdkWindow *root_window; if (event->type == GDK_KEY_PRESS) { if (event->keyval == GDK_Escape) { gtk_drag_cancel (info, event->time); return TRUE; } } /* Now send a "motion" so that the modifier state is updated */ /* The state is not yet updated in the event, so we need * to query it here. We could use XGetModifierMapping, but * that would be overkill. */ root_window = gtk_widget_get_root_window (widget); gdk_window_get_pointer (root_window, NULL, NULL, &state); event->state = state; gtk_drag_update (info, info->cur_screen, info->cur_x, info->cur_y, (GdkEvent *)event); return TRUE; } /************************************************************* * gtk_drag_button_release_cb: * "button_release_event" callback during drag. * arguments: * * results: *************************************************************/ static gint gtk_drag_button_release_cb (GtkWidget *widget, GdkEventButton *event, gpointer data) { GtkDragSourceInfo *info = (GtkDragSourceInfo *)data; if (event->button != info->button) return FALSE; if ((info->context->action != 0) && (info->context->dest_window != NULL)) { gtk_drag_end (info, event->time); gtk_drag_drop (info, event->time); } else { gtk_drag_cancel (info, event->time); } return TRUE; } static gint gtk_drag_abort_timeout (gpointer data) { GtkDragSourceInfo *info = data; guint32 time = GDK_CURRENT_TIME; GDK_THREADS_ENTER (); if (info->proxy_dest) time = info->proxy_dest->proxy_drop_time; info->drop_timeout = 0; gtk_drag_drop_finished (info, FALSE, time); GDK_THREADS_LEAVE (); return FALSE; } /** * gtk_drag_check_threshold: * @widget: a #GtkWidget * @start_x: X coordinate of start of drag * @start_y: Y coordinate of start of drag * @current_x: current X coordinate * @current_y: current Y coordinate * * Checks to see if a mouse drag starting at (@start_x, @start_y) and ending * at (@current_x, @current_y) has passed the GTK+ drag threshhold, and thus * should trigger the beginning of a drag-and-drop operation. * * Return Value: %TRUE if the drag threshold has been passed. **/ gboolean gtk_drag_check_threshold (GtkWidget *widget, gint start_x, gint start_y, gint current_x, gint current_y) { gint drag_threshold; g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE); g_object_get (gtk_widget_get_settings (widget), "gtk-dnd-drag-threshold", &drag_threshold, NULL); return (ABS (current_x - start_x) > drag_threshold || ABS (current_y - start_y) > drag_threshold); }