ui/gfx/gtk_preserve_window.cc - chromium/src - Git at Google

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "ui/gfx/gtk_preserve_window.h"

 #include <gdk/gdkwindow.h>
 #include <gtk/gtk.h>
 #include <gtk/gtkwidget.h>
 #include <gtk/gtkfixed.h>

 G_BEGIN_DECLS

 #define GTK_PRESERVE_WINDOW_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), \
                                             GTK_TYPE_PRESERVE_WINDOW, \
                                             GtkPreserveWindowPrivate))

 typedef struct _GtkPreserveWindowPrivate GtkPreserveWindowPrivate;

 struct _GtkPreserveWindowPrivate {
   // If true, don't create/destroy windows on realize/unrealize.
   gboolean preserve_window;

   // Whether or not we delegate the resize of the GdkWindow
   // to someone else.
   gboolean delegate_resize;
 };

 G_DEFINE_TYPE(GtkPreserveWindow, gtk_preserve_window, GTK_TYPE_FIXED)

 static void gtk_preserve_window_destroy(GtkObject* object);
 static void gtk_preserve_window_realize(GtkWidget* widget);
 static void gtk_preserve_window_unrealize(GtkWidget* widget);
 static void gtk_preserve_window_size_allocate(GtkWidget* widget,
                                               GtkAllocation* allocation);

 static void gtk_preserve_window_class_init(GtkPreserveWindowClass *klass) {
   GtkWidgetClass* widget_class = reinterpret_cast<GtkWidgetClass*>(klass);
   widget_class->realize = gtk_preserve_window_realize;
   widget_class->unrealize = gtk_preserve_window_unrealize;
   widget_class->size_allocate = gtk_preserve_window_size_allocate;

   GtkObjectClass* object_class = reinterpret_cast<GtkObjectClass*>(klass);
   object_class->destroy = gtk_preserve_window_destroy;

   GObjectClass* gobject_class = G_OBJECT_CLASS(klass);
   g_type_class_add_private(gobject_class, sizeof(GtkPreserveWindowPrivate));
 }

 static void gtk_preserve_window_init(GtkPreserveWindow* widget) {
   GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);
   priv->preserve_window = FALSE;

   // These widgets always have their own window.
   gtk_fixed_set_has_window(GTK_FIXED(widget), TRUE);
 }

 GtkWidget* gtk_preserve_window_new() {
   return GTK_WIDGET(g_object_new(GTK_TYPE_PRESERVE_WINDOW, NULL));
 }

 static void gtk_preserve_window_destroy(GtkObject* object) {
   GtkWidget* widget = reinterpret_cast<GtkWidget*>(object);
   GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);

   if (widget->window) {
     gdk_window_set_user_data(widget->window, NULL);
     // If the window is preserved, someone else must destroy it.
     if (!priv->preserve_window)
       gdk_window_destroy(widget->window);
     widget->window = NULL;
   }

   GTK_OBJECT_CLASS(gtk_preserve_window_parent_class)->destroy(object);
 }

 static void gtk_preserve_window_realize(GtkWidget* widget) {
   g_return_if_fail(GTK_IS_PRESERVE_WINDOW(widget));

   if (widget->window) {
     gdk_window_reparent(widget->window,
                         gtk_widget_get_parent_window(widget),
                         widget->allocation.x,
                         widget->allocation.y);
     GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);
     if (!priv->delegate_resize) {
       gdk_window_resize(widget->window,
                         widget->allocation.width,
                         widget->allocation.height);
     }
     widget->style = gtk_style_attach(widget->style, widget->window);
     gtk_style_set_background(widget->style, widget->window, GTK_STATE_NORMAL);

     gint event_mask = gtk_widget_get_events(widget);
     event_mask |= GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK;
     gdk_window_set_events(widget->window, (GdkEventMask) event_mask);
     gdk_window_set_user_data(widget->window, widget);

     // Deprecated as of GTK 2.22. Used for compatibility.
     // It should be: gtk_widget_set_realized(widget, TRUE)
     GTK_WIDGET_SET_FLAGS(widget, GTK_REALIZED);
   } else {
     GTK_WIDGET_CLASS(gtk_preserve_window_parent_class)->realize(widget);
   }
 }

 static void gtk_preserve_window_unrealize(GtkWidget* widget) {
   g_return_if_fail(GTK_IS_PRESERVE_WINDOW(widget));

   GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);
   if (priv->preserve_window) {
     GtkWidgetClass* widget_class =
         GTK_WIDGET_CLASS(gtk_preserve_window_parent_class);
     GtkContainerClass* container_class =
         GTK_CONTAINER_CLASS(gtk_preserve_window_parent_class);

     // Deprecated as of GTK 2.22. Used for compatibility.
     // It should be: gtk_widget_get_mapped()
     if (GTK_WIDGET_MAPPED(widget)) {
       widget_class->unmap(widget);

       // Deprecated as of GTK 2.22. Used for compatibility.
       // It should be: gtk_widget_set_mapped(widget, FALSE)
       GTK_WIDGET_UNSET_FLAGS(widget, GTK_MAPPED);
     }

     // This is the behavior from GtkWidget, inherited by GtkFixed.
     // It is unclear why we should not call the potentially overridden
     // unrealize method (via the callback), but doing so causes errors.
     container_class->forall(
         GTK_CONTAINER(widget), FALSE,
         reinterpret_cast<GtkCallback>(gtk_widget_unrealize), NULL);

     gtk_style_detach(widget->style);
     gdk_window_reparent(widget->window, gdk_get_default_root_window(), 0, 0);
     gtk_selection_remove_all(widget);
     gdk_window_set_user_data(widget->window, NULL);

     // Deprecated as of GTK 2.22. Used for compatibility.
     // It should be: gtk_widget_set_realized(widget, FALSE)
     GTK_WIDGET_UNSET_FLAGS(widget, GTK_REALIZED);
   } else {
     GTK_WIDGET_CLASS(gtk_preserve_window_parent_class)->unrealize(widget);
   }
 }

 gboolean gtk_preserve_window_get_preserve(GtkPreserveWindow* window) {
   g_return_val_if_fail(GTK_IS_PRESERVE_WINDOW(window), FALSE);
   GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(window);

   return priv->preserve_window;
 }

 void gtk_preserve_window_set_preserve(GtkPreserveWindow* window,
                                       gboolean value) {
   g_return_if_fail(GTK_IS_PRESERVE_WINDOW(window));
   GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(window);
   priv->preserve_window = value;

   GtkWidget* widget = GTK_WIDGET(window);
   if (value && !widget->window) {
     GdkWindowAttr attributes;
     gint attributes_mask;

     // We may not know the width and height, so we rely on the fact
     // that a size-allocation will resize it later.
     attributes.width = 1;
     attributes.height = 1;

     attributes.window_type = GDK_WINDOW_CHILD;
     attributes.wclass = GDK_INPUT_OUTPUT;
     attributes.override_redirect = TRUE;

     attributes.visual = gtk_widget_get_visual(widget);
     attributes.colormap = gtk_widget_get_colormap(widget);

     attributes.event_mask = gtk_widget_get_events(widget);
     attributes.event_mask |= GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK;

     attributes_mask = GDK_WA_VISUAL | GDK_WA_COLORMAP | GDK_WA_NOREDIR;
     widget->window = gdk_window_new(
         gdk_get_default_root_window(), &attributes, attributes_mask);
   } else if (!value && widget->window && !GTK_WIDGET_REALIZED(widget)) {
     gdk_window_destroy(widget->window);
     widget->window = NULL;
   }
 }

 void gtk_preserve_window_size_allocate(GtkWidget* widget,
                                        GtkAllocation* allocation) {
   g_return_if_fail(GTK_IS_PRESERVE_WINDOW(widget));

   widget->allocation = *allocation;

   if (GTK_WIDGET_REALIZED(widget)) {
     GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);
     if (priv->delegate_resize) {
       gdk_window_move(widget->window, allocation->x, allocation->y);
     } else {
       gdk_window_move_resize(
           widget->window, allocation->x, allocation->y,
           allocation->width, allocation->height);
     }
   }

   // Propagate resize to children
   guint16 border_width = GTK_CONTAINER(widget)->border_width;
   GList *children = GTK_FIXED(widget)->children;
   while (children) {
     GtkFixedChild *child = reinterpret_cast<GtkFixedChild*>(children->data);
     if (GTK_WIDGET_VISIBLE(child->widget)) {
       GtkRequisition child_requisition;
       gtk_widget_get_child_requisition(child->widget, &child_requisition);

       GtkAllocation child_allocation;
       child_allocation.x = child->x + border_width;
       child_allocation.y = child->y + border_width;
       child_allocation.width = child_requisition.width;
       child_allocation.height = child_requisition.height;

       gtk_widget_size_allocate(child->widget, &child_allocation);
     }
     children = children->next;
   }
 }

 void gtk_preserve_window_delegate_resize(GtkPreserveWindow* widget,
                                          gboolean delegate) {
   GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);
   priv->delegate_resize = delegate;
 }

 G_END_DECLS
	// Copyright (c) 2011 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "ui/gfx/gtk_preserve_window.h"

	#include <gdk/gdkwindow.h>
	#include <gtk/gtk.h>
	#include <gtk/gtkwidget.h>
	#include <gtk/gtkfixed.h>

	G_BEGIN_DECLS

	#define GTK_PRESERVE_WINDOW_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), \
	GTK_TYPE_PRESERVE_WINDOW, \
	GtkPreserveWindowPrivate))

	typedef struct _GtkPreserveWindowPrivate GtkPreserveWindowPrivate;

	struct _GtkPreserveWindowPrivate {
	// If true, don't create/destroy windows on realize/unrealize.
	gboolean preserve_window;

	// Whether or not we delegate the resize of the GdkWindow
	// to someone else.
	gboolean delegate_resize;
	};

	G_DEFINE_TYPE(GtkPreserveWindow, gtk_preserve_window, GTK_TYPE_FIXED)

	static void gtk_preserve_window_destroy(GtkObject* object);
	static void gtk_preserve_window_realize(GtkWidget* widget);
	static void gtk_preserve_window_unrealize(GtkWidget* widget);
	static void gtk_preserve_window_size_allocate(GtkWidget* widget,
	GtkAllocation* allocation);

	static void gtk_preserve_window_class_init(GtkPreserveWindowClass *klass) {
	GtkWidgetClass* widget_class = reinterpret_cast<GtkWidgetClass*>(klass);
	widget_class->realize = gtk_preserve_window_realize;
	widget_class->unrealize = gtk_preserve_window_unrealize;
	widget_class->size_allocate = gtk_preserve_window_size_allocate;

	GtkObjectClass* object_class = reinterpret_cast<GtkObjectClass*>(klass);
	object_class->destroy = gtk_preserve_window_destroy;

	GObjectClass* gobject_class = G_OBJECT_CLASS(klass);
	g_type_class_add_private(gobject_class, sizeof(GtkPreserveWindowPrivate));
	}

	static void gtk_preserve_window_init(GtkPreserveWindow* widget) {
	GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);
	priv->preserve_window = FALSE;

	// These widgets always have their own window.
	gtk_fixed_set_has_window(GTK_FIXED(widget), TRUE);
	}

	GtkWidget* gtk_preserve_window_new() {
	return GTK_WIDGET(g_object_new(GTK_TYPE_PRESERVE_WINDOW, NULL));
	}

	static void gtk_preserve_window_destroy(GtkObject* object) {
	GtkWidget* widget = reinterpret_cast<GtkWidget*>(object);
	GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);

	if (widget->window) {
	gdk_window_set_user_data(widget->window, NULL);
	// If the window is preserved, someone else must destroy it.
	if (!priv->preserve_window)
	gdk_window_destroy(widget->window);
	widget->window = NULL;
	}

	GTK_OBJECT_CLASS(gtk_preserve_window_parent_class)->destroy(object);
	}

	static void gtk_preserve_window_realize(GtkWidget* widget) {
	g_return_if_fail(GTK_IS_PRESERVE_WINDOW(widget));

	if (widget->window) {
	gdk_window_reparent(widget->window,
	gtk_widget_get_parent_window(widget),
	widget->allocation.x,
	widget->allocation.y);
	GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);
	if (!priv->delegate_resize) {
	gdk_window_resize(widget->window,
	widget->allocation.width,
	widget->allocation.height);
	}
	widget->style = gtk_style_attach(widget->style, widget->window);
	gtk_style_set_background(widget->style, widget->window, GTK_STATE_NORMAL);

	gint event_mask = gtk_widget_get_events(widget);
	event_mask \|= GDK_EXPOSURE_MASK \| GDK_BUTTON_PRESS_MASK;
	gdk_window_set_events(widget->window, (GdkEventMask) event_mask);
	gdk_window_set_user_data(widget->window, widget);

	// Deprecated as of GTK 2.22. Used for compatibility.
	// It should be: gtk_widget_set_realized(widget, TRUE)
	GTK_WIDGET_SET_FLAGS(widget, GTK_REALIZED);
	} else {
	GTK_WIDGET_CLASS(gtk_preserve_window_parent_class)->realize(widget);
	}
	}

	static void gtk_preserve_window_unrealize(GtkWidget* widget) {
	g_return_if_fail(GTK_IS_PRESERVE_WINDOW(widget));

	GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);
	if (priv->preserve_window) {
	GtkWidgetClass* widget_class =
	GTK_WIDGET_CLASS(gtk_preserve_window_parent_class);
	GtkContainerClass* container_class =
	GTK_CONTAINER_CLASS(gtk_preserve_window_parent_class);

	// Deprecated as of GTK 2.22. Used for compatibility.
	// It should be: gtk_widget_get_mapped()
	if (GTK_WIDGET_MAPPED(widget)) {
	widget_class->unmap(widget);

	// Deprecated as of GTK 2.22. Used for compatibility.
	// It should be: gtk_widget_set_mapped(widget, FALSE)
	GTK_WIDGET_UNSET_FLAGS(widget, GTK_MAPPED);
	}

	// This is the behavior from GtkWidget, inherited by GtkFixed.
	// It is unclear why we should not call the potentially overridden
	// unrealize method (via the callback), but doing so causes errors.
	container_class->forall(
	GTK_CONTAINER(widget), FALSE,
	reinterpret_cast<GtkCallback>(gtk_widget_unrealize), NULL);

	gtk_style_detach(widget->style);
	gdk_window_reparent(widget->window, gdk_get_default_root_window(), 0, 0);
	gtk_selection_remove_all(widget);
	gdk_window_set_user_data(widget->window, NULL);

	// Deprecated as of GTK 2.22. Used for compatibility.
	// It should be: gtk_widget_set_realized(widget, FALSE)
	GTK_WIDGET_UNSET_FLAGS(widget, GTK_REALIZED);
	} else {
	GTK_WIDGET_CLASS(gtk_preserve_window_parent_class)->unrealize(widget);
	}
	}

	gboolean gtk_preserve_window_get_preserve(GtkPreserveWindow* window) {
	g_return_val_if_fail(GTK_IS_PRESERVE_WINDOW(window), FALSE);
	GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(window);

	return priv->preserve_window;
	}

	void gtk_preserve_window_set_preserve(GtkPreserveWindow* window,
	gboolean value) {
	g_return_if_fail(GTK_IS_PRESERVE_WINDOW(window));
	GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(window);
	priv->preserve_window = value;

	GtkWidget* widget = GTK_WIDGET(window);
	if (value && !widget->window) {
	GdkWindowAttr attributes;
	gint attributes_mask;

	// We may not know the width and height, so we rely on the fact
	// that a size-allocation will resize it later.
	attributes.width = 1;
	attributes.height = 1;

	attributes.window_type = GDK_WINDOW_CHILD;
	attributes.wclass = GDK_INPUT_OUTPUT;
	attributes.override_redirect = TRUE;

	attributes.visual = gtk_widget_get_visual(widget);
	attributes.colormap = gtk_widget_get_colormap(widget);

	attributes.event_mask = gtk_widget_get_events(widget);
	attributes.event_mask \|= GDK_EXPOSURE_MASK \| GDK_BUTTON_PRESS_MASK;

	attributes_mask = GDK_WA_VISUAL \| GDK_WA_COLORMAP \| GDK_WA_NOREDIR;
	widget->window = gdk_window_new(
	gdk_get_default_root_window(), &attributes, attributes_mask);
	} else if (!value && widget->window && !GTK_WIDGET_REALIZED(widget)) {
	gdk_window_destroy(widget->window);
	widget->window = NULL;
	}
	}

	void gtk_preserve_window_size_allocate(GtkWidget* widget,
	GtkAllocation* allocation) {
	g_return_if_fail(GTK_IS_PRESERVE_WINDOW(widget));

	widget->allocation = *allocation;

	if (GTK_WIDGET_REALIZED(widget)) {
	GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);
	if (priv->delegate_resize) {
	gdk_window_move(widget->window, allocation->x, allocation->y);
	} else {
	gdk_window_move_resize(
	widget->window, allocation->x, allocation->y,
	allocation->width, allocation->height);
	}
	}

	// Propagate resize to children
	guint16 border_width = GTK_CONTAINER(widget)->border_width;
	GList *children = GTK_FIXED(widget)->children;
	while (children) {
	GtkFixedChild child = reinterpret_cast<GtkFixedChild>(children->data);
	if (GTK_WIDGET_VISIBLE(child->widget)) {
	GtkRequisition child_requisition;
	gtk_widget_get_child_requisition(child->widget, &child_requisition);

	GtkAllocation child_allocation;
	child_allocation.x = child->x + border_width;
	child_allocation.y = child->y + border_width;
	child_allocation.width = child_requisition.width;
	child_allocation.height = child_requisition.height;

	gtk_widget_size_allocate(child->widget, &child_allocation);
	}
	children = children->next;
	}
	}

	void gtk_preserve_window_delegate_resize(GtkPreserveWindow* widget,
	gboolean delegate) {
	GtkPreserveWindowPrivate* priv = GTK_PRESERVE_WINDOW_GET_PRIVATE(widget);
	priv->delegate_resize = delegate;
	}

	G_END_DECLS