views: Add an empty menu bar.

atom/browser/ui/views/menu_layout.cc

@@ -0,0 +1,54 @@
+// Copyright (c) 2014 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/ui/views/menu_layout.h"
+
+namespace atom {
+
+MenuLayout::MenuLayout(int menu_height)
+    : menu_height_(menu_height) {
+}
+
+MenuLayout::~MenuLayout() {
+}
+
+void MenuLayout::Layout(views::View* host) {
+  if (!HasMenu(host)) {
+    views::FillLayout::Layout(host);
+    return;
+  }
+
+  gfx::Size size = host->GetContentsBounds().size();
+  gfx::Rect menu_Bar_bounds = gfx::Rect(0, 0, size.width(), menu_height_);
+  gfx::Rect web_view_bounds = gfx::Rect(
+      0, menu_height_, size.width(), size.height() - menu_height_);
+
+  views::View* menu_bar = host->child_at(0);
+  views::View* web_view = host->child_at(1);
+  menu_bar->SetBoundsRect(menu_Bar_bounds);
+  web_view->SetBoundsRect(web_view_bounds);
+}
+
+gfx::Size MenuLayout::GetPreferredSize(views::View* host) {
+  gfx::Size size = views::FillLayout::GetPreferredSize(host);
+  if (!HasMenu(host))
+    return size;
+
+  size.set_height(size.height() + menu_height_);
+  return size;
+}
+
+int MenuLayout::GetPreferredHeightForWidth(views::View* host, int width) {
+  int height = views::FillLayout::GetPreferredHeightForWidth(host, width);
+  if (!HasMenu(host))
+    return height;
+
+  return height + menu_height_;
+}
+
+bool MenuLayout::HasMenu(const views::View* host) const {
+  return host->child_count() == 2;
+}
+
+}  // namespace atom