Gtk: Make click target of tabs match their appearance.

chrome/browser/ui/gtk/gtk_input_event_box.cc

+// 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 "chrome/browser/ui/gtk/gtk_input_event_box.h"
+
+#include <gdk/gdkwindow.h>
+#include <gtk/gtk.h>
+#include <gtk/gtkwidget.h>
+#include <gtk/gtkbin.h>
+
+G_BEGIN_DECLS
+
+#define GTK_INPUT_EVENT_BOX_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), \
+                                            GTK_TYPE_INPUT_EVENT_BOX, \
+                                            GtkInputEventBoxPrivate))
+
+typedef struct _GtkInputEventBoxPrivate GtkInputEventBoxPrivate;
+
+struct _GtkInputEventBoxPrivate {
+  GdkWindow* event_window;
+};
+
+G_DEFINE_TYPE(GtkInputEventBox, gtk_input_event_box, GTK_TYPE_BIN)
+
+static void gtk_input_event_box_realize(GtkWidget* widget);
+static void gtk_input_event_box_unrealize(GtkWidget* widget);
+static void gtk_input_event_box_map(GtkWidget* widget);
+static void gtk_input_event_box_unmap(GtkWidget* widget);
+static void gtk_input_event_box_size_allocate(GtkWidget* widget,
+                                              GtkAllocation* allocation);
+static void gtk_input_event_box_size_request(GtkWidget* widget,
+                                             GtkRequisition* requisition);
+
+static void gtk_input_event_box_class_init(GtkInputEventBoxClass* klass) {
+  GtkWidgetClass* widget_class = reinterpret_cast<GtkWidgetClass*>(klass);
+  widget_class->realize = gtk_input_event_box_realize;
+  widget_class->unrealize = gtk_input_event_box_unrealize;
+  widget_class->map = gtk_input_event_box_map;
+  widget_class->unmap = gtk_input_event_box_unmap;
+  widget_class->size_allocate = gtk_input_event_box_size_allocate;
+  widget_class->size_request = gtk_input_event_box_size_request;
+
+  GObjectClass* gobject_class = G_OBJECT_CLASS(klass);
+  g_type_class_add_private(gobject_class, sizeof(GtkInputEventBoxPrivate));
+}
+
+static void gtk_input_event_box_init(GtkInputEventBox* widget) {
+  GtkInputEventBoxPrivate* priv = GTK_INPUT_EVENT_BOX_GET_PRIVATE(widget);
+  priv->event_window = NULL;
+}
+
+GtkWidget* gtk_input_event_box_new() {
+  return GTK_WIDGET(g_object_new(GTK_TYPE_INPUT_EVENT_BOX, NULL));
+}
+
+static void gtk_input_event_box_realize(GtkWidget* widget) {
+  g_return_if_fail(GTK_IS_INPUT_EVENT_BOX(widget));
+
+  GtkInputEventBoxPrivate* priv = GTK_INPUT_EVENT_BOX_GET_PRIVATE(widget);
+
+  GdkWindow* parent = gtk_widget_get_parent_window(widget);
+  GdkWindowAttr attributes;
+  GtkAllocation allocation;
+  gint attributes_mask = GDK_WA_X | GDK_WA_Y;
+
+  gtk_widget_get_allocation(widget, &allocation);
+
+  attributes.x = allocation.x;
+  attributes.y = allocation.y;
+  attributes.width = allocation.width;
+  attributes.height = allocation.height;
+
+  attributes.window_type = GDK_WINDOW_CHILD;
+  attributes.wclass = GDK_INPUT_ONLY;
+
+  attributes.event_mask = gtk_widget_get_events(widget)
+      | GDK_BUTTON_MOTION_MASK
+      | GDK_BUTTON_PRESS_MASK
+      | GDK_BUTTON_RELEASE_MASK
+      | GDK_EXPOSURE_MASK
+      | GDK_ENTER_NOTIFY_MASK
+      | GDK_LEAVE_NOTIFY_MASK;
+
+  priv->event_window = gdk_window_new(parent, &attributes, attributes_mask);
+  gdk_window_set_user_data(priv->event_window, widget);
+
+  GTK_WIDGET_CLASS(gtk_input_event_box_parent_class)->realize(widget);
+}
+
+static void gtk_input_event_box_unrealize(GtkWidget* widget) {
+  g_return_if_fail(GTK_IS_INPUT_EVENT_BOX(widget));
+
+  GtkInputEventBoxPrivate* priv = GTK_INPUT_EVENT_BOX_GET_PRIVATE(widget);
+  if (priv->event_window) {
+    gdk_window_set_user_data(priv->event_window, NULL);
+    gdk_window_destroy(priv->event_window);
+    priv->event_window = NULL;
+  }
+
+  GTK_WIDGET_CLASS(gtk_input_event_box_parent_class)->unrealize(widget);
+}
+
+static void gtk_input_event_box_map(GtkWidget* widget) {
+  g_return_if_fail(GTK_IS_INPUT_EVENT_BOX(widget));
+
+  GtkInputEventBoxPrivate* priv = GTK_INPUT_EVENT_BOX_GET_PRIVATE(widget);
+  if (priv->event_window)
+    gdk_window_show(priv->event_window);
+
+  GTK_WIDGET_CLASS(gtk_input_event_box_parent_class)->map(widget);
+}
+
+static void gtk_input_event_box_unmap(GtkWidget* widget) {
+  g_return_if_fail(GTK_IS_INPUT_EVENT_BOX(widget));
+
+  GtkInputEventBoxPrivate* priv = GTK_INPUT_EVENT_BOX_GET_PRIVATE(widget);
+  if (priv->event_window)
+    gdk_window_hide(priv->event_window);
+
+  GTK_WIDGET_CLASS(gtk_input_event_box_parent_class)->unmap(widget);
+}
+
+static void gtk_input_event_box_size_allocate(GtkWidget* widget,
+                                              GtkAllocation* allocation) {
+  g_return_if_fail(GTK_IS_INPUT_EVENT_BOX(widget));
+
+  widget->allocation = *allocation;
+
+  GtkInputEventBoxPrivate* priv = GTK_INPUT_EVENT_BOX_GET_PRIVATE(widget);
+  if (priv->event_window) {
+    gdk_window_move_resize(priv->event_window,
+                           allocation->x,
+                           allocation->y,
+                           allocation->width,
+                           allocation->height);
+  }
+
+  GtkWidget* child = gtk_bin_get_child(GTK_BIN(widget));
+  if (child)
+    gtk_widget_size_allocate(child, allocation);
+}
+
+static void gtk_input_event_box_size_request(GtkWidget* widget,
+                                             GtkRequisition* requisition) {
+
+  GtkWidget* child = gtk_bin_get_child(GTK_BIN(widget));
+  if (child)
+    gtk_widget_size_request(child, requisition);
+}
+
+GdkWindow* gtk_input_event_box_get_window(GtkInputEventBox* widget) {
+  g_return_val_if_fail(GTK_IS_INPUT_EVENT_BOX(widget), NULL);
+
+  GtkInputEventBoxPrivate* priv = GTK_INPUT_EVENT_BOX_GET_PRIVATE(widget);
+  return priv->event_window;
+}
+
+G_END_DECLS