Begin work on extension shelf for Linux.

chrome/browser/gtk/extension_shelf_gtk.cc

Index: chrome/browser/gtk/extension_shelf_gtk.cc
diff --git a/chrome/browser/gtk/extension_shelf_gtk.cc b/chrome/browser/gtk/extension_shelf_gtk.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5ae0c9ca01d1808fdd2d4527afc49a089c0193f5
--- /dev/null
+++ b/chrome/browser/gtk/extension_shelf_gtk.cc
@@ -0,0 +1,131 @@
+// Copyright (c) 2009 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/gtk/extension_shelf_gtk.h"
+
+#include "chrome/browser/browser.h"
+#include "chrome/browser/gtk/browser_window_gtk.h"
+#include "chrome/browser/gtk/gtk_theme_provider.h"
+#include "chrome/browser/gtk/nine_box.h"
+#include "chrome/browser/profile.h"
+#include "chrome/common/notification_service.h"
+#include "grit/app_resources.h"
+#include "grit/generated_resources.h"
+#include "grit/theme_resources.h"
+
+ExtensionShelfGtk::ExtensionShelfGtk(Profile* profile, Browser* browser)
+    : browser_(browser),
+      theme_provider_(GtkThemeProvider::GetFrom(profile)),
+      model_(new ExtensionShelfModel(browser)) {
+  Init(profile);
+
+  registrar_.Add(this, NotificationType::BROWSER_THEME_CHANGED,
+                 NotificationService::AllSources());
+}
+
+ExtensionShelfGtk::~ExtensionShelfGtk() {
+  model_->RemoveObserver(this);
+  event_box_.Destroy();
+}
+
+void ExtensionShelfGtk::AddShelfToBox(GtkWidget* box) {
+  gtk_box_pack_end(GTK_BOX(box), event_box_.get(), FALSE, FALSE, 0);
+}
+
+void ExtensionShelfGtk::Show() {
+  gtk_widget_show_all(event_box_.get());
+}
+
+void ExtensionShelfGtk::Hide() {
+  gtk_widget_hide(event_box_.get());
+}
+
+void ExtensionShelfGtk::ToolstripInsertedAt(ExtensionHost* toolstrip,
+                                            int index) {
+  AdjustHeight();
+}
+
+void ExtensionShelfGtk::ToolstripRemovingAt(ExtensionHost* toolstrip,
+                                            int index) {
+  AdjustHeight();
+}
+
+void ExtensionShelfGtk::ToolstripMoved(ExtensionHost* toolstrip,
+                                       int from_index,
+                                       int to_index) {
+  AdjustHeight();
+}
+
+void ExtensionShelfGtk::ToolstripChangedAt(ExtensionHost* toolstrip,
+                                           int index) {
+  AdjustHeight();
+}
+
+void ExtensionShelfGtk::ExtensionShelfEmpty() {
+  AdjustHeight();
+}
+
+void ExtensionShelfGtk::ShelfModelReloaded() {
+  AdjustHeight();
+}
+
+void ExtensionShelfGtk::Init(Profile* profile) {
+  event_box_.Own(gtk_event_box_new());
+
+  shelf_hbox_ = gtk_hbox_new(FALSE, 0);
+  gtk_widget_set_app_paintable(shelf_hbox_, TRUE);
+  g_signal_connect(G_OBJECT(shelf_hbox_), "expose-event",
+                   G_CALLBACK(&OnHBoxExpose), this);
+  gtk_container_add(GTK_CONTAINER(event_box_.get()), shelf_hbox_);
+
+  label_ = gtk_label_new("(extension shelf will appear here)");
+  gtk_box_pack_start(GTK_BOX(shelf_hbox_), label_,
+                     TRUE, TRUE, 0);
+
+  AdjustHeight();
+
+  model_->AddObserver(this);
+}
+
+void ExtensionShelfGtk::Observe(NotificationType type,
+                                const NotificationSource& source,
+                                const NotificationDetails& details) {
+  if (type == NotificationType::BROWSER_THEME_CHANGED) {
+    // TODO(phajdan.jr): Handle theme changes.
+  } else {
+    NOTREACHED() << "unexpected notification";
+  }
+}
+
+void ExtensionShelfGtk::InitBackground() {
+  if (background_ninebox_.get())
+    return;
+
+  background_ninebox_.reset(new NineBox(
+      browser_->profile()->GetThemeProvider(),
+      0, IDR_THEME_TOOLBAR, 0, 0, 0, 0, 0, 0, 0));
+}
+
+void ExtensionShelfGtk::AdjustHeight() {
+  int target_height = model_->empty() ? 0 : event_box_->requisition.height;
+  gtk_widget_set_size_request(event_box_.get(), -1, target_height);
+}
+
+// static
+gboolean ExtensionShelfGtk::OnHBoxExpose(GtkWidget* widget,
+                                         GdkEventExpose* event,
+                                         ExtensionShelfGtk* bar) {
+  // Paint the background theme image.
+  cairo_t* cr = gdk_cairo_create(GDK_DRAWABLE(widget->window));
+  cairo_rectangle(cr, event->area.x, event->area.y,
+                  event->area.width, event->area.height);
+  cairo_clip(cr);
+  bar->InitBackground();
+  bar->background_ninebox_->RenderTopCenterStrip(
+      cr, event->area.x, event->area.y,
+      event->area.x + event->area.width);
+  cairo_destroy(cr);
+
+  return FALSE;  // Propagate expose to children.
+}