forked from AuroraMiddleware/gtk
557 lines
17 KiB
C
557 lines
17 KiB
C
/* Change Display
|
|
*
|
|
* Demonstrates migrating a window between different displays.
|
|
* A display is a mouse and keyboard with some number of
|
|
* associated monitors. The neat thing about having multiple
|
|
* displays is that they can be on a completely separate
|
|
* computers, as long as there is a network connection to the
|
|
* computer where the application is running.
|
|
*
|
|
* Only some of the windowing systems where GTK+ runs have the
|
|
* concept of multiple displays. (The X Window System is the
|
|
* main example.) Other windowing systems can only handle one
|
|
* keyboard and mouse, and combine all monitors into
|
|
* a single display.
|
|
*
|
|
* This is a moderately complex example, and demonstrates:
|
|
*
|
|
* - Tracking the currently open displays
|
|
*
|
|
* - Changing the display for a window
|
|
*
|
|
* - Letting the user choose a window by clicking on it
|
|
*
|
|
* - Using GtkListStore and GtkTreeView
|
|
*
|
|
* - Using GtkDialog
|
|
*/
|
|
#include <string.h>
|
|
#include <glib/gi18n.h>
|
|
#include <gtk/gtk.h>
|
|
|
|
/* The ChangeDisplayInfo structure corresponds to a toplevel window and
|
|
* holds pointers to widgets inside the toplevel window along with other
|
|
* information about the contents of the window.
|
|
* This is a common organizational structure in real applications.
|
|
*/
|
|
typedef struct _ChangeDisplayInfo ChangeDisplayInfo;
|
|
|
|
struct _ChangeDisplayInfo
|
|
{
|
|
GtkWidget *window;
|
|
GtkSizeGroup *size_group;
|
|
|
|
GtkTreeModel *display_model;
|
|
|
|
GdkDisplay *current_display;
|
|
};
|
|
|
|
/* These enumerations provide symbolic names for the columns
|
|
* in the two GtkListStore models.
|
|
*/
|
|
enum
|
|
{
|
|
DISPLAY_COLUMN_NAME,
|
|
DISPLAY_COLUMN_DISPLAY,
|
|
DISPLAY_NUM_COLUMNS
|
|
};
|
|
|
|
enum
|
|
{
|
|
SCREEN_COLUMN_NUMBER,
|
|
SCREEN_COLUMN_SCREEN,
|
|
SCREEN_NUM_COLUMNS
|
|
};
|
|
|
|
/* Finds the toplevel window under the mouse pointer, if any.
|
|
*/
|
|
static GtkWidget *
|
|
find_toplevel_at_pointer (GdkDisplay *display)
|
|
{
|
|
GdkWindow *pointer_window;
|
|
GtkWidget *widget = NULL;
|
|
|
|
pointer_window = gdk_device_get_window_at_position (gtk_get_current_event_device (),
|
|
NULL, NULL);
|
|
|
|
/* The user data field of a GdkWindow is used to store a pointer
|
|
* to the widget that created it.
|
|
*/
|
|
if (pointer_window)
|
|
{
|
|
gpointer widget_ptr;
|
|
gdk_window_get_user_data (pointer_window, &widget_ptr);
|
|
widget = widget_ptr;
|
|
}
|
|
|
|
return widget ? gtk_widget_get_toplevel (widget) : NULL;
|
|
}
|
|
|
|
static gboolean
|
|
release_event_cb (GtkWidget *widget,
|
|
GdkEvent *event,
|
|
gboolean *clicked)
|
|
{
|
|
if (gdk_event_get_event_type (event) == GDK_BUTTON_RELEASE)
|
|
*clicked = TRUE;
|
|
return TRUE;
|
|
}
|
|
|
|
/* Asks the user to click on a window, then waits for them click
|
|
* the mouse. When the mouse is released, returns the toplevel
|
|
* window under the pointer, or NULL, if there is none.
|
|
*/
|
|
static GtkWidget *
|
|
query_for_toplevel (GdkDisplay *display,
|
|
const char *prompt)
|
|
{
|
|
GtkWidget *popup, *label, *frame;
|
|
GdkCursor *cursor;
|
|
GtkWidget *toplevel = NULL;
|
|
GdkDevice *device;
|
|
|
|
popup = gtk_window_new (GTK_WINDOW_POPUP);
|
|
gtk_window_set_display (GTK_WINDOW (popup), display);
|
|
gtk_window_set_modal (GTK_WINDOW (popup), TRUE);
|
|
gtk_window_set_position (GTK_WINDOW (popup), GTK_WIN_POS_CENTER);
|
|
|
|
frame = gtk_frame_new (NULL);
|
|
gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_OUT);
|
|
gtk_container_add (GTK_CONTAINER (popup), frame);
|
|
|
|
label = gtk_label_new (prompt);
|
|
g_object_set (label, "margin", 10, NULL);
|
|
gtk_container_add (GTK_CONTAINER (frame), label);
|
|
|
|
gtk_widget_show (popup);
|
|
cursor = gdk_cursor_new_from_name ("crosshair", NULL);
|
|
device = gtk_get_current_event_device ();
|
|
|
|
if (gdk_seat_grab (gdk_device_get_seat (device),
|
|
gtk_widget_get_window (popup),
|
|
GDK_SEAT_CAPABILITY_ALL_POINTING,
|
|
FALSE, cursor, NULL, NULL, NULL) == GDK_GRAB_SUCCESS)
|
|
{
|
|
gboolean clicked = FALSE;
|
|
|
|
g_signal_connect (popup, "event",
|
|
G_CALLBACK (release_event_cb), &clicked);
|
|
|
|
/* Process events until clicked is set by our button release event handler.
|
|
* We pass in may_block=TRUE since we want to wait if there
|
|
* are no events currently.
|
|
*/
|
|
while (!clicked)
|
|
g_main_context_iteration (NULL, TRUE);
|
|
|
|
toplevel = find_toplevel_at_pointer (display);
|
|
if (toplevel == popup)
|
|
toplevel = NULL;
|
|
}
|
|
|
|
g_object_unref (cursor);
|
|
gtk_widget_destroy (popup);
|
|
|
|
return toplevel;
|
|
}
|
|
|
|
/* Prompts the user for a toplevel window to move, and then moves
|
|
* that window to the currently selected display
|
|
*/
|
|
static void
|
|
query_change_display (ChangeDisplayInfo *info)
|
|
{
|
|
GdkDisplay *display = gtk_widget_get_display (info->window);
|
|
GtkWidget *toplevel;
|
|
|
|
toplevel = query_for_toplevel (display,
|
|
"Please select the toplevel\n"
|
|
"to move to the new display");
|
|
|
|
if (toplevel)
|
|
gtk_window_set_display (GTK_WINDOW (toplevel), info->current_display);
|
|
else
|
|
gdk_display_beep (display);
|
|
}
|
|
|
|
/* Called when the user clicks on a button in our dialog or
|
|
* closes the dialog through the window manager. Unless the
|
|
* "Change" button was clicked, we destroy the dialog.
|
|
*/
|
|
static void
|
|
response_cb (GtkDialog *dialog,
|
|
gint response_id,
|
|
ChangeDisplayInfo *info)
|
|
{
|
|
if (response_id == GTK_RESPONSE_OK)
|
|
query_change_display (info);
|
|
else
|
|
gtk_widget_destroy (GTK_WIDGET (dialog));
|
|
}
|
|
|
|
/* Called when the user clicks on "Open..." in the display
|
|
* frame. Prompts for a new display, and then opens a connection
|
|
* to that display.
|
|
*/
|
|
static void
|
|
open_display_cb (GtkWidget *button,
|
|
ChangeDisplayInfo *info)
|
|
{
|
|
GtkWidget *content_area;
|
|
GtkWidget *dialog;
|
|
GtkWidget *display_entry;
|
|
GtkWidget *dialog_label;
|
|
gchar *new_screen_name = NULL;
|
|
GdkDisplay *result = NULL;
|
|
|
|
dialog = gtk_dialog_new_with_buttons ("Open Display",
|
|
GTK_WINDOW (info->window),
|
|
GTK_DIALOG_MODAL,
|
|
_("_Cancel"), GTK_RESPONSE_CANCEL,
|
|
_("_OK"), GTK_RESPONSE_OK,
|
|
NULL);
|
|
|
|
gtk_dialog_set_default_response (GTK_DIALOG (dialog), GTK_RESPONSE_OK);
|
|
display_entry = gtk_entry_new ();
|
|
gtk_entry_set_activates_default (GTK_ENTRY (display_entry), TRUE);
|
|
dialog_label =
|
|
gtk_label_new ("Please enter the name of\nthe new display\n");
|
|
|
|
content_area = gtk_dialog_get_content_area (GTK_DIALOG (dialog));
|
|
|
|
gtk_container_add (GTK_CONTAINER (content_area), dialog_label);
|
|
gtk_container_add (GTK_CONTAINER (content_area), display_entry);
|
|
|
|
gtk_widget_grab_focus (display_entry);
|
|
|
|
while (!result)
|
|
{
|
|
gint response_id = gtk_dialog_run (GTK_DIALOG (dialog));
|
|
if (response_id != GTK_RESPONSE_OK)
|
|
break;
|
|
|
|
new_screen_name = gtk_editable_get_chars (GTK_EDITABLE (display_entry),
|
|
0, -1);
|
|
|
|
if (strcmp (new_screen_name, "") != 0)
|
|
{
|
|
result = gdk_display_open (new_screen_name);
|
|
if (!result)
|
|
{
|
|
gchar *error_msg =
|
|
g_strdup_printf ("Can't open display:\n\t%s\nplease try another one\n",
|
|
new_screen_name);
|
|
gtk_label_set_text (GTK_LABEL (dialog_label), error_msg);
|
|
g_free (error_msg);
|
|
}
|
|
|
|
g_free (new_screen_name);
|
|
}
|
|
}
|
|
|
|
gtk_widget_destroy (dialog);
|
|
}
|
|
|
|
/* Called when the user clicks on the "Close" button in the
|
|
* "Display" frame. Closes the selected display.
|
|
*/
|
|
static void
|
|
close_display_cb (GtkWidget *button,
|
|
ChangeDisplayInfo *info)
|
|
{
|
|
if (info->current_display)
|
|
gdk_display_close (info->current_display);
|
|
}
|
|
|
|
/* Called when the selected row in the display list changes.
|
|
* Updates info->current_display, then refills the list of
|
|
* screens.
|
|
*/
|
|
static void
|
|
display_changed_cb (GtkTreeSelection *selection,
|
|
ChangeDisplayInfo *info)
|
|
{
|
|
GtkTreeModel *model;
|
|
GtkTreeIter iter;
|
|
|
|
if (info->current_display)
|
|
g_object_unref (info->current_display);
|
|
if (gtk_tree_selection_get_selected (selection, &model, &iter))
|
|
gtk_tree_model_get (model, &iter,
|
|
DISPLAY_COLUMN_DISPLAY, &info->current_display,
|
|
-1);
|
|
else
|
|
info->current_display = NULL;
|
|
}
|
|
|
|
/* This function is used both for creating the "Display" and
|
|
* "Screen" frames, since they have a similar structure. The
|
|
* caller hooks up the right context for the value returned
|
|
* in tree_view, and packs any relevant buttons into button_vbox.
|
|
*/
|
|
static void
|
|
create_frame (ChangeDisplayInfo *info,
|
|
const char *title,
|
|
GtkWidget **frame,
|
|
GtkWidget **tree_view,
|
|
GtkWidget **button_vbox)
|
|
{
|
|
GtkTreeSelection *selection;
|
|
GtkWidget *scrollwin;
|
|
GtkWidget *hbox;
|
|
|
|
*frame = gtk_frame_new (title);
|
|
|
|
hbox = gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 8);
|
|
g_object_set (hbox, "margin", 8, NULL);
|
|
gtk_container_add (GTK_CONTAINER (*frame), hbox);
|
|
|
|
scrollwin = gtk_scrolled_window_new (NULL, NULL);
|
|
gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrollwin),
|
|
GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
|
|
gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrollwin),
|
|
GTK_SHADOW_IN);
|
|
gtk_box_pack_start (GTK_BOX (hbox), scrollwin);
|
|
|
|
*tree_view = gtk_tree_view_new ();
|
|
gtk_tree_view_set_headers_visible (GTK_TREE_VIEW (*tree_view), FALSE);
|
|
gtk_container_add (GTK_CONTAINER (scrollwin), *tree_view);
|
|
|
|
selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (*tree_view));
|
|
gtk_tree_selection_set_mode (selection, GTK_SELECTION_BROWSE);
|
|
|
|
*button_vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
|
|
gtk_box_pack_start (GTK_BOX (hbox), *button_vbox);
|
|
|
|
if (!info->size_group)
|
|
info->size_group = gtk_size_group_new (GTK_SIZE_GROUP_HORIZONTAL);
|
|
|
|
gtk_size_group_add_widget (GTK_SIZE_GROUP (info->size_group), *button_vbox);
|
|
}
|
|
|
|
/* If we have a stack of buttons, it often looks better if their contents
|
|
* are left-aligned, rather than centered. This function creates a button
|
|
* and left-aligns it contents.
|
|
*/
|
|
GtkWidget *
|
|
left_align_button_new (const char *label)
|
|
{
|
|
GtkWidget *button = gtk_button_new_with_mnemonic (label);
|
|
GtkWidget *child = gtk_bin_get_child (GTK_BIN (button));
|
|
|
|
gtk_widget_set_halign (child, GTK_ALIGN_START);
|
|
gtk_widget_set_valign (child, GTK_ALIGN_CENTER);
|
|
|
|
return button;
|
|
}
|
|
|
|
/* Creates the "Display" frame in the main window.
|
|
*/
|
|
GtkWidget *
|
|
create_display_frame (ChangeDisplayInfo *info)
|
|
{
|
|
GtkWidget *frame;
|
|
GtkWidget *tree_view;
|
|
GtkWidget *button_vbox;
|
|
GtkTreeViewColumn *column;
|
|
GtkTreeSelection *selection;
|
|
GtkWidget *button;
|
|
|
|
create_frame (info, "Display", &frame, &tree_view, &button_vbox);
|
|
|
|
button = left_align_button_new ("_Open...");
|
|
g_signal_connect (button, "clicked", G_CALLBACK (open_display_cb), info);
|
|
gtk_box_pack_start (GTK_BOX (button_vbox), button);
|
|
|
|
button = left_align_button_new ("_Close");
|
|
g_signal_connect (button, "clicked", G_CALLBACK (close_display_cb), info);
|
|
gtk_box_pack_start (GTK_BOX (button_vbox), button);
|
|
|
|
info->display_model = (GtkTreeModel *)gtk_list_store_new (DISPLAY_NUM_COLUMNS,
|
|
G_TYPE_STRING,
|
|
GDK_TYPE_DISPLAY);
|
|
|
|
gtk_tree_view_set_model (GTK_TREE_VIEW (tree_view), info->display_model);
|
|
|
|
column = gtk_tree_view_column_new_with_attributes ("Name",
|
|
gtk_cell_renderer_text_new (),
|
|
"text", DISPLAY_COLUMN_NAME,
|
|
NULL);
|
|
gtk_tree_view_append_column (GTK_TREE_VIEW (tree_view), column);
|
|
|
|
selection = gtk_tree_view_get_selection (GTK_TREE_VIEW (tree_view));
|
|
g_signal_connect (selection, "changed",
|
|
G_CALLBACK (display_changed_cb), info);
|
|
|
|
return frame;
|
|
}
|
|
|
|
/* Called when one of the currently open displays is closed.
|
|
* Remove it from our list of displays.
|
|
*/
|
|
static void
|
|
display_closed_cb (GdkDisplay *display,
|
|
gboolean is_error,
|
|
ChangeDisplayInfo *info)
|
|
{
|
|
GtkTreeIter iter;
|
|
gboolean valid;
|
|
|
|
for (valid = gtk_tree_model_get_iter_first (info->display_model, &iter);
|
|
valid;
|
|
valid = gtk_tree_model_iter_next (info->display_model, &iter))
|
|
{
|
|
GdkDisplay *tmp_display;
|
|
|
|
gtk_tree_model_get (info->display_model, &iter,
|
|
DISPLAY_COLUMN_DISPLAY, &tmp_display,
|
|
-1);
|
|
if (tmp_display == display)
|
|
{
|
|
gtk_list_store_remove (GTK_LIST_STORE (info->display_model), &iter);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Adds a new display to our list of displays, and connects
|
|
* to the "closed" signal so that we can remove it from the
|
|
* list of displays again.
|
|
*/
|
|
static void
|
|
add_display (ChangeDisplayInfo *info,
|
|
GdkDisplay *display)
|
|
{
|
|
const gchar *name = gdk_display_get_name (display);
|
|
GtkTreeIter iter;
|
|
|
|
gtk_list_store_append (GTK_LIST_STORE (info->display_model), &iter);
|
|
gtk_list_store_set (GTK_LIST_STORE (info->display_model), &iter,
|
|
DISPLAY_COLUMN_NAME, name,
|
|
DISPLAY_COLUMN_DISPLAY, display,
|
|
-1);
|
|
|
|
g_signal_connect (display, "closed",
|
|
G_CALLBACK (display_closed_cb), info);
|
|
}
|
|
|
|
/* Called when a new display is opened
|
|
*/
|
|
static void
|
|
display_opened_cb (GdkDisplayManager *manager,
|
|
GdkDisplay *display,
|
|
ChangeDisplayInfo *info)
|
|
{
|
|
add_display (info, display);
|
|
}
|
|
|
|
/* Adds all currently open displays to our list of displays,
|
|
* and set up a signal connection so that we'll be notified
|
|
* when displays are opened in the future as well.
|
|
*/
|
|
static void
|
|
initialize_displays (ChangeDisplayInfo *info)
|
|
{
|
|
GdkDisplayManager *manager = gdk_display_manager_get ();
|
|
GSList *displays = gdk_display_manager_list_displays (manager);
|
|
GSList *tmp_list;
|
|
|
|
for (tmp_list = displays; tmp_list; tmp_list = tmp_list->next)
|
|
add_display (info, tmp_list->data);
|
|
|
|
g_slist_free (tmp_list);
|
|
|
|
g_signal_connect (manager, "display-opened",
|
|
G_CALLBACK (display_opened_cb), info);
|
|
}
|
|
|
|
/* Cleans up when the toplevel is destroyed; we remove the
|
|
* connections we use to track currently open displays, then
|
|
* free the ChangeDisplayInfo structure.
|
|
*/
|
|
static void
|
|
destroy_info (ChangeDisplayInfo *info)
|
|
{
|
|
GdkDisplayManager *manager = gdk_display_manager_get ();
|
|
GSList *displays = gdk_display_manager_list_displays (manager);
|
|
GSList *tmp_list;
|
|
|
|
g_signal_handlers_disconnect_by_func (manager,
|
|
display_opened_cb,
|
|
info);
|
|
|
|
for (tmp_list = displays; tmp_list; tmp_list = tmp_list->next)
|
|
g_signal_handlers_disconnect_by_func (tmp_list->data,
|
|
display_closed_cb,
|
|
info);
|
|
|
|
g_slist_free (tmp_list);
|
|
|
|
g_object_unref (info->size_group);
|
|
g_object_unref (info->display_model);
|
|
|
|
if (info->current_display)
|
|
g_object_unref (info->current_display);
|
|
|
|
g_free (info);
|
|
}
|
|
|
|
static void
|
|
destroy_cb (GObject *object,
|
|
ChangeDisplayInfo **info)
|
|
{
|
|
destroy_info (*info);
|
|
*info = NULL;
|
|
}
|
|
|
|
/* Main entry point. If the dialog for this demo doesn't yet exist, creates
|
|
* it. Otherwise, destroys it.
|
|
*/
|
|
GtkWidget *
|
|
do_changedisplay (GtkWidget *do_widget)
|
|
{
|
|
static ChangeDisplayInfo *info = NULL;
|
|
|
|
if (!info)
|
|
{
|
|
GtkWidget *content_area;
|
|
GtkWidget *vbox;
|
|
GtkWidget *frame;
|
|
|
|
info = g_new0 (ChangeDisplayInfo, 1);
|
|
|
|
info->window = gtk_dialog_new_with_buttons ("Change Display",
|
|
GTK_WINDOW (do_widget),
|
|
0,
|
|
"Close", GTK_RESPONSE_CLOSE,
|
|
"Change", GTK_RESPONSE_OK,
|
|
NULL);
|
|
|
|
gtk_window_set_default_size (GTK_WINDOW (info->window), 300, 400);
|
|
|
|
g_signal_connect (info->window, "response",
|
|
G_CALLBACK (response_cb), info);
|
|
g_signal_connect (info->window, "destroy",
|
|
G_CALLBACK (destroy_cb), &info);
|
|
|
|
content_area = gtk_dialog_get_content_area (GTK_DIALOG (info->window));
|
|
|
|
vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
|
|
g_object_set (vbox, "margin", 8, NULL);
|
|
gtk_box_pack_start (GTK_BOX (content_area), vbox);
|
|
|
|
frame = create_display_frame (info);
|
|
gtk_box_pack_start (GTK_BOX (vbox), frame);
|
|
|
|
initialize_displays (info);
|
|
|
|
gtk_widget_show (info->window);
|
|
return info->window;
|
|
}
|
|
else
|
|
{
|
|
gtk_widget_destroy (info->window);
|
|
return NULL;
|
|
}
|
|
}
|