mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-09-20 14:00:10 +00:00
501 lines
14 KiB
C
501 lines
14 KiB
C
/* Drag-and-Drop
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*
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* This demo shows dragging colors and widgets.
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* The items in this demo can be moved, recolored
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* and rotated.
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*/
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#include <gtk/gtk.h>
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static GdkContentProvider *
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prepare (GtkDragSource *source,
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double x,
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double y)
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{
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GtkWidget *canvas;
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GtkWidget *item;
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canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
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item = gtk_widget_pick (canvas, x, y, GTK_PICK_DEFAULT);
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if (!GTK_IS_LABEL (item))
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return NULL;
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g_object_set_data (G_OBJECT (canvas), "dragged-item", item);
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return gdk_content_provider_new_typed (GTK_TYPE_WIDGET, item);
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}
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static void
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drag_begin (GtkDragSource *source,
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GdkDrag *drag)
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{
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GtkWidget *canvas;
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GtkWidget *item;
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canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
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item = g_object_get_data (G_OBJECT (canvas), "dragged-item");
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gtk_widget_set_opacity (item, 0.5);
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}
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static void
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drag_end (GtkDragSource *source,
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GdkDrag *drag)
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{
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GtkWidget *canvas;
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GtkWidget *item;
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canvas = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (source));
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item = g_object_get_data (G_OBJECT (canvas), "dragged-item");
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g_object_set_data (G_OBJECT (canvas), "dragged-item", NULL);
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gtk_widget_set_opacity (item, 1.0);
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}
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static void
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drag_cancel (GtkDragSource *source,
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GdkDrag *drag,
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GdkDragCancelReason reason)
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{
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drag_end (source, drag);
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}
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typedef struct {
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double x, y;
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double angle;
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double delta;
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} TransformData;
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static void
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apply_transform (GtkWidget *item)
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{
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GtkWidget *canvas = gtk_widget_get_parent (item);
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TransformData *data;
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GskTransform *transform;
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data = g_object_get_data (G_OBJECT (item), "transform-data");
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transform = gsk_transform_rotate (gsk_transform_translate (NULL, &(graphene_point_t){data->x, data->y}),
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data->angle + data->delta);
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gtk_fixed_set_child_transform (GTK_FIXED (canvas), item, transform);
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gsk_transform_unref (transform);
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}
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static gboolean
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drag_drop (GtkDropTarget *target,
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const GValue *value,
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double x,
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double y)
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{
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GtkWidget *item;
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TransformData *transform_data;
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GtkWidget *canvas;
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GtkWidget *last_child;
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item = g_value_get_object (value);
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transform_data = g_object_get_data (G_OBJECT (item), "transform-data");
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transform_data->x = x;
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transform_data->y = y;
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canvas = gtk_widget_get_parent (item);
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last_child = gtk_widget_get_last_child (canvas);
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if (item != last_child)
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gtk_widget_insert_after (item, canvas, last_child);
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apply_transform (item);
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return TRUE;
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}
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static double pos_x, pos_y;
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static GtkWidget * canvas_item_new (double x, double y);
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static void
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new_item_cb (GtkWidget *button, gpointer data)
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{
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GtkWidget *canvas = data;
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GtkWidget *item;
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item = canvas_item_new (pos_x, pos_y);
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gtk_container_add (GTK_CONTAINER (canvas), item);
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apply_transform (item);
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gtk_popover_popdown (GTK_POPOVER (gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER)));
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}
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static void
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edit_label_done (GtkWidget *entry, gpointer data)
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{
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GtkWidget *canvas = gtk_widget_get_parent (entry);
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GtkWidget *label;
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int x, y;
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gtk_fixed_get_child_position (GTK_FIXED (canvas), entry, &x, &y);
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label = GTK_WIDGET (g_object_get_data (G_OBJECT (entry), "label"));
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gtk_label_set_text (GTK_LABEL (label), gtk_editable_get_text (GTK_EDITABLE (entry)));
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gtk_widget_show (label);
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gtk_widget_destroy (entry);
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}
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static void
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edit_cb (GtkWidget *button, GtkWidget *child)
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{
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GtkWidget *canvas = gtk_widget_get_parent (child);
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int x, y;
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gtk_fixed_get_child_position (GTK_FIXED (canvas), child, &x, &y);
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if (GTK_IS_LABEL (child))
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{
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GtkWidget *entry = gtk_entry_new ();
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g_object_set_data (G_OBJECT (entry), "label", child);
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gtk_editable_set_text (GTK_EDITABLE (entry), gtk_label_get_text (GTK_LABEL (child)));
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gtk_editable_set_width_chars (GTK_EDITABLE (entry), 12);
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g_signal_connect (entry, "activate", G_CALLBACK (edit_label_done), NULL);
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gtk_fixed_put (GTK_FIXED (canvas), entry, x, y);
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gtk_widget_grab_focus (entry);
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gtk_widget_hide (child);
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}
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if (button)
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gtk_popover_popdown (GTK_POPOVER (gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER)));
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}
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static void
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delete_cb (GtkWidget *button, GtkWidget *child)
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{
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gtk_widget_destroy (child);
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gtk_popover_popdown (GTK_POPOVER (gtk_widget_get_ancestor (button, GTK_TYPE_POPOVER)));
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}
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static void
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pressed_cb (GtkGesture *gesture,
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int n_press,
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double x,
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double y,
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gpointer data)
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{
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GtkWidget *widget;
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GtkWidget *child;
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widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
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child = gtk_widget_pick (widget, x, y, GTK_PICK_DEFAULT);
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if (gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture)) == GDK_BUTTON_SECONDARY)
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{
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GtkWidget *menu;
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GtkWidget *box;
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GtkWidget *item;
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pos_x = x;
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pos_y = y;
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menu = gtk_popover_new ();
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gtk_widget_set_parent (menu, widget);
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gtk_popover_set_has_arrow (GTK_POPOVER (menu), FALSE);
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gtk_popover_set_pointing_to (GTK_POPOVER (menu), &(GdkRectangle){ x, y, 1, 1});
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box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
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gtk_container_add (GTK_CONTAINER (menu), box);
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item = gtk_button_new_with_label ("New");
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gtk_button_set_has_frame (GTK_BUTTON (item), FALSE);
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g_signal_connect (item, "clicked", G_CALLBACK (new_item_cb), widget);
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gtk_container_add (GTK_CONTAINER (box), item);
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item = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
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gtk_container_add (GTK_CONTAINER (box), item);
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item = gtk_button_new_with_label ("Edit");
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gtk_button_set_has_frame (GTK_BUTTON (item), FALSE);
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gtk_widget_set_sensitive (item, child != NULL && child != widget);
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g_signal_connect (item, "clicked", G_CALLBACK (edit_cb), child);
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gtk_container_add (GTK_CONTAINER (box), item);
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item = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
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gtk_container_add (GTK_CONTAINER (box), item);
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item = gtk_button_new_with_label ("Delete");
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gtk_button_set_has_frame (GTK_BUTTON (item), FALSE);
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gtk_widget_set_sensitive (item, child != NULL && child != widget);
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g_signal_connect (item, "clicked", G_CALLBACK (delete_cb), child);
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gtk_container_add (GTK_CONTAINER (box), item);
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gtk_popover_popup (GTK_POPOVER (menu));
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}
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}
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static void
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released_cb (GtkGesture *gesture,
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int n_press,
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double x,
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double y,
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gpointer data)
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{
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GtkWidget *widget;
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GtkWidget *child;
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widget = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
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child = gtk_widget_pick (widget, x, y, 0);
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if (gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture)) == GDK_BUTTON_PRIMARY)
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{
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if (child != NULL && child != widget)
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edit_cb (NULL, child);
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}
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}
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static GtkWidget *
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canvas_new (void)
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{
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GtkWidget *canvas;
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GtkDragSource *source;
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GtkDropTarget *dest;
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GtkGesture *gesture;
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canvas = gtk_fixed_new ();
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gtk_widget_set_hexpand (canvas, TRUE);
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gtk_widget_set_vexpand (canvas, TRUE);
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gtk_widget_add_css_class (canvas, "frame");
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source = gtk_drag_source_new ();
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gtk_drag_source_set_actions (source, GDK_ACTION_MOVE);
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g_signal_connect (source, "prepare", G_CALLBACK (prepare), NULL);
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g_signal_connect (source, "drag-begin", G_CALLBACK (drag_begin), NULL);
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g_signal_connect (source, "drag-end", G_CALLBACK (drag_end), NULL);
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g_signal_connect (source, "drag-cancel", G_CALLBACK (drag_cancel), NULL);
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gtk_widget_add_controller (canvas, GTK_EVENT_CONTROLLER (source));
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dest = gtk_drop_target_new (GTK_TYPE_WIDGET, GDK_ACTION_MOVE);
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g_signal_connect (dest, "drop", G_CALLBACK (drag_drop), NULL);
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gtk_widget_add_controller (canvas, GTK_EVENT_CONTROLLER (dest));
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gesture = gtk_gesture_click_new ();
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gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (gesture), 0);
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g_signal_connect (gesture, "pressed", G_CALLBACK (pressed_cb), NULL);
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g_signal_connect (gesture, "released", G_CALLBACK (released_cb), NULL);
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gtk_widget_add_controller (canvas, GTK_EVENT_CONTROLLER (gesture));
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return canvas;
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}
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static void
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set_color (GtkWidget *item,
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GdkRGBA *color)
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{
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char *css;
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char *str;
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GtkStyleContext *context;
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GtkCssProvider *provider;
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str = gdk_rgba_to_string (color);
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css = g_strdup_printf ("* { background: %s; padding: 10px; }", str);
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context = gtk_widget_get_style_context (item);
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provider = g_object_get_data (G_OBJECT (context), "style-provider");
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if (provider)
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gtk_style_context_remove_provider (context, GTK_STYLE_PROVIDER (provider));
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provider = gtk_css_provider_new ();
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gtk_css_provider_load_from_data (provider, css, -1);
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gtk_style_context_add_provider (gtk_widget_get_style_context (item), GTK_STYLE_PROVIDER (provider), 800);
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g_object_set_data_full (G_OBJECT (context), "style-provider", provider, g_object_unref);
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g_free (str);
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g_free (css);
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}
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static gboolean
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item_drag_drop (GtkDropTarget *dest,
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const GValue *value,
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double x,
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double y)
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{
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GtkWidget *item = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (dest));
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set_color (item, g_value_get_boxed (value));
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return TRUE;
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}
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static void
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angle_changed (GtkGestureRotate *gesture,
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double angle,
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double delta)
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{
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GtkWidget *item = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
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TransformData *data = g_object_get_data (G_OBJECT (item), "transform-data");
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data->delta = angle / M_PI * 180.0;
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apply_transform (item);
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}
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static void
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rotate_done (GtkGesture *gesture)
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{
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GtkWidget *item = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
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TransformData *data = g_object_get_data (G_OBJECT (item), "transform-data");
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data->angle = data->angle + data->delta;
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data->delta = 0;
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}
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static void
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click_done (GtkGesture *gesture)
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{
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GtkWidget *item = gtk_event_controller_get_widget (GTK_EVENT_CONTROLLER (gesture));
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GtkWidget *canvas = gtk_widget_get_parent (item);
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GtkWidget *last_child;
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last_child = gtk_widget_get_last_child (canvas);
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if (item != last_child)
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gtk_widget_insert_after (item, canvas, last_child);
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}
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static int n_items = 0;
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static GtkWidget *
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canvas_item_new (double x,
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double y)
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{
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GtkWidget *widget;
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char *label;
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char *id;
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TransformData *transform_data;
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GdkRGBA rgba;
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GtkDropTarget *dest;
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GtkGesture *gesture;
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n_items++;
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label = g_strdup_printf ("Item %d", n_items);
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id = g_strdup_printf ("item%d", n_items);
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gdk_rgba_parse (&rgba, "yellow");
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widget = gtk_label_new (label);
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gtk_widget_add_css_class (widget, "frame");
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gtk_widget_set_name (widget, id);
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set_color (widget, &rgba);
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transform_data = g_new0 (TransformData, 1);
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transform_data->x = x;
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transform_data->y = y;
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transform_data->angle = 0.0;
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g_object_set_data_full (G_OBJECT (widget), "transform-data", transform_data, g_free);
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g_free (label);
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g_free (id);
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dest = gtk_drop_target_new (GDK_TYPE_RGBA, GDK_ACTION_COPY);
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g_signal_connect (dest, "drop", G_CALLBACK (item_drag_drop), NULL);
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gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER (dest));
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gesture = gtk_gesture_rotate_new ();
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g_signal_connect (gesture, "angle-changed", G_CALLBACK (angle_changed), NULL);
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g_signal_connect (gesture, "end", G_CALLBACK (rotate_done), NULL);
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gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER (gesture));
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gesture = gtk_gesture_click_new ();
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g_signal_connect (gesture, "released", G_CALLBACK (click_done), NULL);
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gtk_widget_add_controller (widget, GTK_EVENT_CONTROLLER (gesture));
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return widget;
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}
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static GtkWidget *window = NULL;
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GtkWidget *
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do_dnd (GtkWidget *do_widget)
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{
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if (!window)
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{
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GtkWidget *sw;
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GtkWidget *canvas;
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GtkWidget *widget;
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GtkWidget *box, *box2, *box3;
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const char *colors[] = {
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"red", "green", "blue", "magenta", "orange", "gray", "black", "yellow",
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"white", "gray", "brown", "pink", "cyan", "bisque", "gold", "maroon",
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"navy", "orchid", "olive", "peru", "salmon", "silver", "wheat",
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NULL
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};
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int i;
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int x, y;
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widget = gtk_color_button_new ();
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gtk_widget_destroy (widget);
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window = gtk_window_new ();
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gtk_window_set_display (GTK_WINDOW (window),
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gtk_widget_get_display (do_widget));
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gtk_window_set_title (GTK_WINDOW (window), "Drag-and-Drop");
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gtk_window_set_default_size (GTK_WINDOW (window), 640, 480);
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g_signal_connect (window, "destroy",
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G_CALLBACK (gtk_widget_destroyed), &window);
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box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
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gtk_window_set_child (GTK_WINDOW (window), box);
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box2 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
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gtk_container_add (GTK_CONTAINER (box), box2);
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canvas = canvas_new ();
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gtk_container_add (GTK_CONTAINER (box2), canvas);
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n_items = 0;
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x = y = 40;
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for (i = 0; i < 4; i++)
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{
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GtkWidget *item;
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item = canvas_item_new (x, y);
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gtk_container_add (GTK_CONTAINER (canvas), item);
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apply_transform (item);
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x += 150;
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y += 100;
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}
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sw = gtk_scrolled_window_new (NULL, NULL);
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gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
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GTK_POLICY_AUTOMATIC,
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GTK_POLICY_NEVER);
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gtk_container_add (GTK_CONTAINER (box), sw);
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box3 = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0);
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gtk_widget_add_css_class (box3, "linked");
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gtk_scrolled_window_set_child (GTK_SCROLLED_WINDOW (sw), box3);
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for (i = 0; colors[i]; i++)
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{
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GdkRGBA rgba;
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GtkWidget *swatch;
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gdk_rgba_parse (&rgba, colors[i]);
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swatch = g_object_new (g_type_from_name ("GtkColorSwatch"),
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"rgba", &rgba,
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"selectable", FALSE,
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NULL);
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gtk_container_add (GTK_CONTAINER (box3), swatch);
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}
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}
|
|
|
|
if (!gtk_widget_get_visible (window))
|
|
gtk_widget_show (window);
|
|
else
|
|
gtk_widget_destroy (window);
|
|
|
|
return window;
|
|
}
|