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