[gtk/wip/exalm/focus-entries2: 3/8] Add GtkWindowHandle
- From: Alexander Mikhaylenko <alexm src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/wip/exalm/focus-entries2: 3/8] Add GtkWindowHandle
- Date: Wed, 6 May 2020 15:23:48 +0000 (UTC)
commit 6df63f8ad3f634d9a3b17c512a41e4950562e860
Author: Alexander Mikhaylenko <alexm gnome org>
Date: Sat May 2 20:37:32 2020 +0500
Add GtkWindowHandle
docs/reference/gtk/gtk4-docs.xml | 1 +
docs/reference/gtk/gtk4-sections.txt | 18 +
docs/reference/gtk/gtk4.types.in | 1 +
gtk/gtk.h | 1 +
gtk/gtkwindowhandle.c | 691 +++++++++++++++++++++++++++++++++++
gtk/gtkwindowhandle.h | 44 +++
gtk/meson.build | 2 +
7 files changed, 758 insertions(+)
---
diff --git a/docs/reference/gtk/gtk4-docs.xml b/docs/reference/gtk/gtk4-docs.xml
index 63cc7d7579..6fcf4d2540 100644
--- a/docs/reference/gtk/gtk4-docs.xml
+++ b/docs/reference/gtk/gtk4-docs.xml
@@ -298,6 +298,7 @@
<xi:include href="xml/gtktooltip.xml" />
<xi:include href="xml/gtkwidgetpaintable.xml" />
<xi:include href="xml/gtkwindowcontrols.xml" />
+ <xi:include href="xml/gtkwindowhandle.xml" />
</chapter>
<chapter id="AbstractObjects">
diff --git a/docs/reference/gtk/gtk4-sections.txt b/docs/reference/gtk/gtk4-sections.txt
index 92946bc977..542abdaf63 100644
--- a/docs/reference/gtk/gtk4-sections.txt
+++ b/docs/reference/gtk/gtk4-sections.txt
@@ -4309,6 +4309,24 @@ GTK_WINDOW_CONTROLS_GET_CLASS
gtk_window_controls_get_type
</SECTION>
+<SECTION>
+<FILE>gtkwindowchandle</FILE>
+<TITLE>GtkWindowHandle</TITLE>
+GtkWindowHandle
+gtk_window_handle_new
+gtk_window_handle_get_child
+gtk_window_handle_set_child
+<SUBSECTION Standard>
+GTK_WINDOW_HANDLE
+GTK_IS_WINDOW_HANDLE
+GTK_TYPE_WINDOW_HANDLE
+GTK_WINDOW_HANDLE_CLASS
+GTK_IS_WINDOW_HANDLE_CLASS
+GTK_WINDOW_HANDLE_GET_CLASS
+<SUBSECTION Private>
+gtk_window_handle_get_type
+</SECTION>
+
<SECTION>
<FILE>gtkmain</FILE>
<TITLE>General</TITLE>
diff --git a/docs/reference/gtk/gtk4.types.in b/docs/reference/gtk/gtk4.types.in
index 6fa275416c..8001a45b68 100644
--- a/docs/reference/gtk/gtk4.types.in
+++ b/docs/reference/gtk/gtk4.types.in
@@ -215,3 +215,4 @@ gtk_widget_get_type
gtk_window_get_type
gtk_window_controls_get_type
gtk_window_group_get_type
+gtk_window_handle_get_type
diff --git a/gtk/gtk.h b/gtk/gtk.h
index e9bf5e1cff..ca76e135fc 100644
--- a/gtk/gtk.h
+++ b/gtk/gtk.h
@@ -253,6 +253,7 @@
#include <gtk/gtkwindow.h>
#include <gtk/gtkwindowcontrols.h>
#include <gtk/gtkwindowgroup.h>
+#include <gtk/gtkwindowhandle.h>
#include <gtk/gtk-autocleanups.h>
diff --git a/gtk/gtkwindowhandle.c b/gtk/gtkwindowhandle.c
new file mode 100644
index 0000000000..d7b97a39b5
--- /dev/null
+++ b/gtk/gtkwindowhandle.c
@@ -0,0 +1,691 @@
+/*
+ * Copyright (c) 2020 Alexander Mikhaylenko <alexm gnome org>
+ *
+ * This program 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 program 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 program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+
+#include "gtkwindowhandle.h"
+
+#include "gtkbinlayout.h"
+#include "gtkbox.h"
+#include "gtkbuildable.h"
+#include "gtkgestureclick.h"
+#include "gtkgesturedrag.h"
+#include "gtkgestureprivate.h"
+#include "gtkintl.h"
+#include "gtkmodelbuttonprivate.h"
+#include "gtknative.h"
+#include "gtkpopovermenuprivate.h"
+#include "gtkprivate.h"
+#include "gtkseparator.h"
+#include "gtkwidgetprivate.h"
+#include "gtkwindowprivate.h"
+
+/**
+ * SECTION:gtkwindowhandle
+ * @Short_description: A titlebar area widget
+ * @Title: GtkWindowHandle
+ * @See_also: #GtkWindow, #GtkHeaderBar
+ *
+ * GtkWindowHandle is a titlebar area widget. When added into a window, it can
+ * be dragged to move the window, and handles right click double click and
+ * middle click as expected of a titlebar.
+ *
+ * # CSS nodes
+ *
+ * #GtkWindowHandle has a single CSS node with the name windowhandle.
+ */
+
+struct _GtkWindowHandle {
+ GtkWidget parent_instance;
+
+ GtkGesture *click_gesture;
+ GtkGesture *drag_gesture;
+ GtkGesture *bubble_drag_gesture;
+
+ GtkWidget *child;
+ GtkWidget *fallback_menu;
+};
+
+enum {
+ PROP_0,
+ PROP_CHILD,
+ LAST_PROP
+};
+
+static GParamSpec *props[LAST_PROP] = { NULL, };
+
+static void gtk_window_handle_buildable_iface_init (GtkBuildableIface *iface);
+
+G_DEFINE_TYPE_WITH_CODE (GtkWindowHandle, gtk_window_handle, GTK_TYPE_WIDGET,
+ G_IMPLEMENT_INTERFACE (GTK_TYPE_BUILDABLE, gtk_window_handle_buildable_iface_init))
+
+static void
+lower_window (GtkWindowHandle *self)
+{
+ GdkSurface *surface =
+ gtk_native_get_surface (gtk_widget_get_native (GTK_WIDGET (self)));
+
+ gdk_toplevel_lower (GDK_TOPLEVEL (surface));
+}
+
+static GtkWindow *
+get_window (GtkWindowHandle *self)
+{
+ GtkRoot *root = gtk_widget_get_root (GTK_WIDGET (self));
+
+ if (GTK_IS_WINDOW (root))
+ return GTK_WINDOW (root);
+
+ return NULL;
+}
+
+static void
+restore_window_clicked (GtkModelButton *button,
+ GtkWindowHandle *self)
+{
+ GtkWindow *window = get_window (self);
+
+ if (!window)
+ return;
+
+ if (gtk_window_is_maximized (window))
+ gtk_window_unmaximize (window);
+}
+
+static void
+move_window_clicked (GtkModelButton *button,
+ GtkWindowHandle *self)
+{
+ GtkNative *native = gtk_widget_get_native (GTK_WIDGET (self));
+ GdkSurface *surface = gtk_native_get_surface (native);
+
+ gdk_surface_begin_move_drag (surface,
+ NULL,
+ 0, /* 0 means "use keyboard" */
+ 0, 0,
+ GDK_CURRENT_TIME);
+}
+
+static void
+resize_window_clicked (GtkModelButton *button,
+ GtkWindowHandle *self)
+{
+ GtkNative *native = gtk_widget_get_native (GTK_WIDGET (self));
+ GdkSurface *surface = gtk_native_get_surface (native);
+
+ gdk_surface_begin_resize_drag (surface,
+ 0,
+ NULL,
+ 0, /* 0 means "use keyboard" */
+ 0, 0,
+ GDK_CURRENT_TIME);
+}
+
+static void
+minimize_window_clicked (GtkModelButton *button,
+ GtkWindowHandle *self)
+{
+ GtkWindow *window = get_window (self);
+
+ if (!window)
+ return;
+
+ /* Turns out, we can't minimize a maximized window */
+ if (gtk_window_is_maximized (window))
+ gtk_window_unmaximize (window);
+
+ gtk_window_minimize (window);
+}
+
+static void
+maximize_window_clicked (GtkModelButton *button,
+ GtkWindowHandle *self)
+{
+ GtkWindow *window = get_window (self);
+
+ if (window)
+ gtk_window_maximize (window);
+}
+
+static void
+close_window_clicked (GtkModelButton *button,
+ GtkWindowHandle *self)
+{
+ GtkWindow *window = get_window (self);
+
+ if (window)
+ gtk_window_close (window);
+}
+
+static void
+popup_menu_closed (GtkPopover *popover,
+ GtkWindowHandle *self)
+{
+ g_clear_pointer (&self->fallback_menu, gtk_widget_unparent);
+}
+
+static void
+do_popup_fallback (GtkWindowHandle *self,
+ GdkEvent *event)
+{
+ GdkRectangle rect = { 0, 0, 1, 1 };
+ GdkDevice *device;
+ GtkWidget *box, *menuitem;
+ GtkWindow *window;
+ gboolean maximized, resizable, deletable;
+
+ g_clear_pointer (&self->fallback_menu, gtk_widget_destroy);
+
+ window = get_window (self);
+
+ if (window)
+ {
+ maximized = gtk_window_is_maximized (window);
+ resizable = gtk_window_get_resizable (window);
+ deletable = gtk_window_get_deletable (window);
+ }
+ else
+ {
+ maximized = FALSE;
+ resizable = FALSE;
+ deletable = FALSE;
+ }
+
+ self->fallback_menu = gtk_popover_menu_new ();
+ gtk_widget_set_parent (self->fallback_menu, GTK_WIDGET (self));
+
+ gtk_popover_set_has_arrow (GTK_POPOVER (self->fallback_menu), FALSE);
+ gtk_widget_set_halign (self->fallback_menu, GTK_ALIGN_START);
+
+
+ device = gdk_event_get_device (event);
+
+ if (device && gdk_device_get_source (device) == GDK_SOURCE_KEYBOARD)
+ device = gdk_device_get_associated_device (device);
+
+ if (device)
+ {
+ GdkSurface *surface;
+ double px, py;
+
+ surface = gtk_native_get_surface (gtk_widget_get_native (GTK_WIDGET (self)));
+ gdk_surface_get_device_position (surface, device, &px, &py, NULL);
+ rect.x = round (px);
+ rect.y = round (py);
+
+ gtk_widget_translate_coordinates (GTK_WIDGET (gtk_widget_get_native (GTK_WIDGET (self))),
+ GTK_WIDGET (self),
+ rect.x, rect.y,
+ &rect.x, &rect.y);
+ }
+
+ gtk_popover_set_pointing_to (GTK_POPOVER (self->fallback_menu), &rect);
+
+ box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+ gtk_popover_menu_add_submenu (GTK_POPOVER_MENU (self->fallback_menu), box, "main");
+
+ menuitem = gtk_model_button_new ();
+ g_object_set (menuitem, "text", _("Restore"), NULL);
+ gtk_widget_set_sensitive (menuitem, maximized && resizable);
+ g_signal_connect (G_OBJECT (menuitem), "clicked",
+ G_CALLBACK (restore_window_clicked), self);
+ gtk_container_add (GTK_CONTAINER (box), menuitem);
+
+ menuitem = gtk_model_button_new ();
+ g_object_set (menuitem, "text", _("Move"), NULL);
+ gtk_widget_set_sensitive (menuitem, !maximized);
+ g_signal_connect (G_OBJECT (menuitem), "clicked",
+ G_CALLBACK (move_window_clicked), self);
+ gtk_container_add (GTK_CONTAINER (box), menuitem);
+
+ menuitem = gtk_model_button_new ();
+ g_object_set (menuitem, "text", _("Resize"), NULL);
+ gtk_widget_set_sensitive (menuitem, resizable && !maximized);
+ g_signal_connect (G_OBJECT (menuitem), "clicked",
+ G_CALLBACK (resize_window_clicked), self);
+ gtk_container_add (GTK_CONTAINER (box), menuitem);
+
+ menuitem = gtk_model_button_new ();
+ g_object_set (menuitem, "text", _("Minimize"), NULL);
+ g_signal_connect (G_OBJECT (menuitem), "clicked",
+ G_CALLBACK (minimize_window_clicked), self);
+ gtk_container_add (GTK_CONTAINER (box), menuitem);
+
+ menuitem = gtk_model_button_new ();
+ g_object_set (menuitem, "text", _("Maximize"), NULL);
+ gtk_widget_set_sensitive (menuitem, resizable && !maximized);
+ g_signal_connect (G_OBJECT (menuitem), "clicked",
+ G_CALLBACK (maximize_window_clicked), self);
+ gtk_container_add (GTK_CONTAINER (box), menuitem);
+
+ menuitem = gtk_separator_new (GTK_ORIENTATION_HORIZONTAL);
+ gtk_container_add (GTK_CONTAINER (box), menuitem);
+
+ menuitem = gtk_model_button_new ();
+ g_object_set (menuitem, "text", _("Close"), NULL);
+ gtk_widget_set_sensitive (menuitem, deletable);
+ g_signal_connect (G_OBJECT (menuitem), "clicked",
+ G_CALLBACK (close_window_clicked), self);
+ gtk_container_add (GTK_CONTAINER (box), menuitem);
+
+ g_signal_connect (self->fallback_menu, "closed",
+ G_CALLBACK (popup_menu_closed), self);
+ gtk_popover_popup (GTK_POPOVER (self->fallback_menu));
+}
+
+static void
+do_popup (GtkWindowHandle *self,
+ GdkEvent *event)
+{
+ GdkSurface *surface =
+ gtk_native_get_surface (gtk_widget_get_native (GTK_WIDGET (self)));
+
+ if (!gdk_toplevel_show_window_menu (GDK_TOPLEVEL (surface), event))
+ do_popup_fallback (self, event);
+}
+
+static gboolean
+perform_titlebar_action (GtkWindowHandle *self,
+ GdkEvent *event,
+ guint button,
+ gint n_press)
+{
+ GtkSettings *settings;
+ gchar *action = NULL;
+ gboolean retval = TRUE;
+ GtkActionMuxer *context;
+
+ settings = gtk_widget_get_settings (GTK_WIDGET (self));
+ switch (button)
+ {
+ case GDK_BUTTON_PRIMARY:
+ if (n_press == 2)
+ g_object_get (settings, "gtk-titlebar-double-click", &action, NULL);
+ break;
+ case GDK_BUTTON_MIDDLE:
+ g_object_get (settings, "gtk-titlebar-middle-click", &action, NULL);
+ break;
+ case GDK_BUTTON_SECONDARY:
+ g_object_get (settings, "gtk-titlebar-right-click", &action, NULL);
+ break;
+ default:
+ break;
+ }
+
+ context = _gtk_widget_get_action_muxer (GTK_WIDGET (self), TRUE);
+
+ if (action == NULL)
+ retval = FALSE;
+ else if (g_str_equal (action, "none"))
+ retval = FALSE;
+ /* treat all maximization variants the same */
+ else if (g_str_has_prefix (action, "toggle-maximize"))
+ g_action_group_activate_action (G_ACTION_GROUP (context),
+ "window.toggle-maximized",
+ NULL);
+ else if (g_str_equal (action, "lower"))
+ lower_window (self);
+ else if (g_str_equal (action, "minimize"))
+ g_action_group_activate_action (G_ACTION_GROUP (context),
+ "window.minimize",
+ NULL);
+ else if (g_str_equal (action, "menu"))
+ do_popup (self, event);
+ else
+ {
+ g_warning ("Unsupported titlebar action %s", action);
+ retval = FALSE;
+ }
+
+ g_free (action);
+
+ return retval;
+}
+
+static void
+click_gesture_pressed_cb (GtkGestureClick *gesture,
+ int n_press,
+ double x,
+ double y,
+ GtkWindowHandle *self)
+{
+ GtkWidget *widget;
+ GdkEventSequence *sequence;
+ GdkEvent *event;
+ guint button;
+ GtkRoot *root;
+
+ widget = GTK_WIDGET (self);
+ sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture));
+ button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
+ event = gtk_gesture_get_last_event (GTK_GESTURE (gesture), sequence);
+ root = gtk_widget_get_root (widget);
+
+ if (!event)
+ return;
+
+ if (n_press > 1)
+ gtk_gesture_set_state (self->drag_gesture, GTK_EVENT_SEQUENCE_DENIED);
+
+ if (gdk_display_device_is_grabbed (gtk_widget_get_display (widget),
+ gtk_gesture_get_device (GTK_GESTURE (gesture))))
+ {
+ gtk_gesture_set_state (self->drag_gesture, GTK_EVENT_SEQUENCE_DENIED);
+ return;
+ }
+
+ switch (button)
+ {
+ case GDK_BUTTON_PRIMARY:
+ if (GTK_IS_WINDOW (root))
+ gtk_window_update_toplevel (GTK_WINDOW (root));
+
+ if (n_press == 2)
+ perform_titlebar_action (self, event, button, n_press);
+
+ if (gtk_widget_has_grab (GTK_WIDGET (root)))
+ gtk_gesture_set_sequence_state (GTK_GESTURE (gesture),
+ sequence, GTK_EVENT_SEQUENCE_CLAIMED);
+ break;
+
+ case GDK_BUTTON_SECONDARY:
+ if (perform_titlebar_action (self, event, button, n_press))
+ gtk_gesture_set_sequence_state (GTK_GESTURE (gesture),
+ sequence, GTK_EVENT_SEQUENCE_CLAIMED);
+
+ gtk_event_controller_reset (GTK_EVENT_CONTROLLER (gesture));
+ gtk_event_controller_reset (GTK_EVENT_CONTROLLER (self->drag_gesture));
+ break;
+
+ case GDK_BUTTON_MIDDLE:
+ if (perform_titlebar_action (self, event, button, n_press))
+ gtk_gesture_set_sequence_state (GTK_GESTURE (gesture),
+ sequence, GTK_EVENT_SEQUENCE_CLAIMED);
+ break;
+
+ default:
+ return;
+ }
+}
+
+static void
+drag_gesture_update_cb (GtkGestureDrag *gesture,
+ double offset_x,
+ double offset_y,
+ GtkWindowHandle *self)
+{
+ int double_click_distance;
+ GtkSettings *settings;
+
+ settings = gtk_widget_get_settings (GTK_WIDGET (self));
+ g_object_get (settings,
+ "gtk-double-click-distance", &double_click_distance,
+ NULL);
+
+ if (ABS (offset_x) > double_click_distance ||
+ ABS (offset_y) > double_click_distance)
+ {
+ GdkEventSequence *sequence;
+ double start_x, start_y;
+ gint window_x, window_y;
+ GtkNative *native;
+ GdkSurface *surface;
+
+ sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture));
+
+ if (gtk_event_controller_get_propagation_phase (GTK_EVENT_CONTROLLER (gesture)) == GTK_PHASE_CAPTURE)
+ {
+ GtkWidget *event_widget = gtk_gesture_get_last_target (GTK_GESTURE (gesture), sequence);
+
+ /* Check whether the target widget should be left alone at handling
+ * the sequence, this is better done late to give room for gestures
+ * there to go denied.
+ *
+ * Besides claiming gestures, we must bail out too if there's gestures
+ * in the "none" state at this point, as those are still handling events
+ * and can potentially go claimed, and we don't want to stop the target
+ * widget from doing anything.
+ */
+ if (event_widget != GTK_WIDGET (self) &&
+ !gtk_widget_has_grab (event_widget) &&
+ gtk_widget_consumes_motion (event_widget, GTK_WIDGET (self), sequence))
+ {
+ gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_DENIED);
+ return;
+ }
+ }
+
+ gtk_gesture_set_state (GTK_GESTURE (gesture), GTK_EVENT_SEQUENCE_CLAIMED);
+
+ gtk_gesture_drag_get_start_point (gesture, &start_x, &start_y);
+
+ native = gtk_widget_get_native (GTK_WIDGET (self));
+ gtk_widget_translate_coordinates (GTK_WIDGET (self),
+ GTK_WIDGET (native),
+ start_x, start_y,
+ &window_x, &window_y);
+
+ surface = gtk_native_get_surface (native);
+ gdk_surface_begin_move_drag (surface,
+ gtk_gesture_get_device (GTK_GESTURE (gesture)),
+ gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture)),
+ window_x, window_y,
+ gtk_event_controller_get_current_event_time (GTK_EVENT_CONTROLLER
(gesture)));
+
+ gtk_event_controller_reset (GTK_EVENT_CONTROLLER (gesture));
+ gtk_event_controller_reset (GTK_EVENT_CONTROLLER (self->click_gesture));
+ }
+}
+
+static GtkGesture *
+create_drag_gesture (GtkWindowHandle *self)
+{
+ GtkGesture *gesture;
+
+ gesture = gtk_gesture_drag_new ();
+ g_signal_connect (gesture, "drag-update",
+ G_CALLBACK (drag_gesture_update_cb), self);
+ gtk_widget_add_controller (GTK_WIDGET (self), GTK_EVENT_CONTROLLER (gesture));
+
+ return gesture;
+}
+
+static void
+gtk_window_handle_unrealize (GtkWidget *widget)
+{
+ GtkWindowHandle *self = GTK_WINDOW_HANDLE (widget);
+
+ g_clear_pointer (&self->fallback_menu, gtk_widget_destroy);
+
+ GTK_WIDGET_CLASS (gtk_window_handle_parent_class)->unrealize (widget);
+}
+
+static void
+gtk_window_handle_dispose (GObject *object)
+{
+ GtkWindowHandle *self = GTK_WINDOW_HANDLE (object);
+
+ g_clear_pointer (&self->child, gtk_widget_unparent);
+
+ G_OBJECT_CLASS (gtk_window_handle_parent_class)->dispose (object);
+}
+
+static void
+gtk_window_handle_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GtkWindowHandle *self = GTK_WINDOW_HANDLE (object);
+
+ switch (prop_id)
+ {
+ case PROP_CHILD:
+ g_value_set_object (value, gtk_window_handle_get_child (self));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gtk_window_handle_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GtkWindowHandle *self = GTK_WINDOW_HANDLE (object);
+
+ switch (prop_id)
+ {
+ case PROP_CHILD:
+ gtk_window_handle_set_child (self, g_value_get_object (value));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ break;
+ }
+}
+
+static void
+gtk_window_handle_class_init (GtkWindowHandleClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+
+ object_class->dispose = gtk_window_handle_dispose;
+ object_class->get_property = gtk_window_handle_get_property;
+ object_class->set_property = gtk_window_handle_set_property;
+
+ widget_class->unrealize = gtk_window_handle_unrealize;
+ widget_class->grab_focus = gtk_widget_grab_focus_none;
+ widget_class->focus = gtk_widget_focus_child;
+
+ props[PROP_CHILD] =
+ g_param_spec_object ("child",
+ P_("Child"),
+ P_("The child widget"),
+ GTK_TYPE_WIDGET,
+ GTK_PARAM_READWRITE | G_PARAM_EXPLICIT_NOTIFY);
+
+ g_object_class_install_properties (object_class, LAST_PROP, props);
+
+ gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BIN_LAYOUT);
+ gtk_widget_class_set_css_name (widget_class, I_("windowhandle"));
+}
+
+static void
+gtk_window_handle_init (GtkWindowHandle *self)
+{
+ self->click_gesture = gtk_gesture_click_new ();
+ gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (self->click_gesture), 0);
+ gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (self->click_gesture),
+ GTK_PHASE_BUBBLE);
+ g_signal_connect (self->click_gesture, "pressed",
+ G_CALLBACK (click_gesture_pressed_cb), self);
+ gtk_widget_add_controller (GTK_WIDGET (self), GTK_EVENT_CONTROLLER (self->click_gesture));
+
+ self->drag_gesture = create_drag_gesture (self);
+ gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (self->drag_gesture),
+ GTK_PHASE_CAPTURE);
+
+ self->bubble_drag_gesture = create_drag_gesture (self);
+ gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (self->bubble_drag_gesture),
+ GTK_PHASE_BUBBLE);
+}
+
+static GtkBuildableIface *parent_buildable_iface;
+
+static void
+gtk_window_handle_buildable_add_child (GtkBuildable *buildable,
+ GtkBuilder *builder,
+ GObject *child,
+ const gchar *type)
+{
+ if (GTK_IS_WIDGET (child))
+ gtk_window_handle_set_child (GTK_WINDOW_HANDLE (buildable), GTK_WIDGET (child));
+ else
+ parent_buildable_iface->add_child (buildable, builder, child, type);
+}
+
+static void
+gtk_window_handle_buildable_iface_init (GtkBuildableIface *iface)
+{
+ parent_buildable_iface = g_type_interface_peek_parent (iface);
+
+ iface->add_child = gtk_window_handle_buildable_add_child;
+}
+
+/**
+ * gtk_window_handle_new:
+ *
+ * Creates a new #GtkWindowHandle.
+ *
+ * Returns: a new #GtkWindowHandle.
+ **/
+GtkWidget *
+gtk_window_handle_new (void)
+{
+ return g_object_new (GTK_TYPE_WINDOW_HANDLE, NULL);
+}
+
+/**
+ * gtk_window_handle_get_child:
+ * @self: a #GtkWindowHandle
+ *
+ * Gets the child widget of @self.
+ *
+ * Returns: (nullable) (transfer none): the child widget of @self
+ */
+GtkWidget *
+gtk_window_handle_get_child (GtkWindowHandle *self)
+{
+ g_return_val_if_fail (GTK_IS_WINDOW_HANDLE (self), NULL);
+
+ return self->child;
+}
+
+/**
+ * gtk_window_handle_set_child:
+ * @self: a #GtkWindowHandle
+ * @child: (allow-none): the child widget
+ *
+ * Sets the child widget of @self.
+ */
+void
+gtk_window_handle_set_child (GtkWindowHandle *self,
+ GtkWidget *child)
+{
+ g_return_if_fail (GTK_IS_WINDOW_HANDLE (self));
+ g_return_if_fail (child == NULL || GTK_IS_WIDGET (child));
+
+ if (self->child == child)
+ return;
+
+ g_clear_pointer (&self->child, gtk_widget_unparent);
+
+ self->child = child;
+
+ if (child)
+ gtk_widget_set_parent (child, GTK_WIDGET (self));
+
+ g_object_notify_by_pspec (G_OBJECT (self), props[PROP_CHILD]);
+}
diff --git a/gtk/gtkwindowhandle.h b/gtk/gtkwindowhandle.h
new file mode 100644
index 0000000000..1a64d08062
--- /dev/null
+++ b/gtk/gtkwindowhandle.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2020 Alexander Mikhaylenko <alexm gnome org>
+ *
+ * This program 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 program 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 program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#pragma once
+
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
+#include <gtk/gtkwidget.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_WINDOW_HANDLE (gtk_window_handle_get_type ())
+
+GDK_AVAILABLE_IN_ALL
+G_DECLARE_FINAL_TYPE (GtkWindowHandle, gtk_window_handle, GTK, WINDOW_HANDLE, GtkWidget)
+
+GDK_AVAILABLE_IN_ALL
+GtkWidget * gtk_window_handle_new (void);
+
+GDK_AVAILABLE_IN_ALL
+GtkWidget * gtk_window_handle_get_child (GtkWindowHandle *self);
+
+GDK_AVAILABLE_IN_ALL
+void gtk_window_handle_set_child (GtkWindowHandle *self,
+ GtkWidget *child);
+
+G_END_DECLS
diff --git a/gtk/meson.build b/gtk/meson.build
index 3307c1aac1..8287477888 100644
--- a/gtk/meson.build
+++ b/gtk/meson.build
@@ -391,6 +391,7 @@ gtk_public_sources = files([
'gtkwindow.c',
'gtkwindowcontrols.c',
'gtkwindowgroup.c',
+ 'gtkwindowhandle.c',
])
gtk_private_type_headers = files([
@@ -621,6 +622,7 @@ gtk_public_headers = files([
'gtkwindow.h',
'gtkwindowcontrols.h',
'gtkwindowgroup.h',
+ 'gtkwindowhandle.h',
'gtk-a11y.h',
'gtk-autocleanups.h',
'gtk.h',
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