Window controls

mojo/examples/wm_flow/wm/frame_controller.cc

+// Copyright 2014 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 "mojo/examples/wm_flow/wm/frame_controller.h"
+
+#include "mojo/services/public/cpp/view_manager/view.h"
+#include "mojo/views/native_widget_view_manager.h"
+#include "ui/views/background.h"
+#include "ui/views/controls/button/label_button.h"
+#include "ui/views/layout/layout_manager.h"
+#include "ui/views/widget/widget.h"
+
+class FrameController::LayoutManager : public views::LayoutManager,
+                                       public views::ButtonListener {
+ public:
+  explicit LayoutManager(FrameController* controller)
+      : controller_(controller),
+        close_button_(new views::LabelButton(this, L"Begone")),
+        maximize_button_(new views::LabelButton(this, L"Embiggen")) {}
+  virtual ~LayoutManager() {}
+
+ private:
+  const int kButtonFrameMargin = 5;

[sky, 2014/09/11 19:32:22]

nit: make these static, otherwise they should be named kFoo.

+  const int kButtonFrameSpacing = 2;
+  const int kFrameSize = 10;
+
+  // Overridden from views::LayoutManager:
+  virtual void Installed(views::View* host) {
+    host->AddChildView(close_button_);
+    host->AddChildView(maximize_button_);
+  }
+  virtual void Layout(views::View* host) OVERRIDE {
+    gfx::Size ps = close_button_->GetPreferredSize();
+    gfx::Rect bounds = host->GetLocalBounds();
+    close_button_->SetBounds(bounds.right() - kButtonFrameMargin - ps.width(),
+                             kButtonFrameMargin, ps.width(), ps.height());
+
+    ps = maximize_button_->GetPreferredSize();
+    maximize_button_->SetBounds(
+        close_button_->x() - kButtonFrameSpacing - ps.width(),
+        kButtonFrameMargin, ps.width(), ps.height());
+
+    bounds.Inset(kFrameSize,
+                 close_button_->bounds().bottom() + kButtonFrameMargin,
+                 kFrameSize, kFrameSize);
+    controller_->app_view_->SetBounds(bounds);
+  }
+  virtual gfx::Size GetPreferredSize(const views::View* host) const OVERRIDE {
+    return gfx::Size();
+  }
+
+  // Overridden from views::ButtonListener:
+  virtual void ButtonPressed(views::Button* sender,
+                             const ui::Event& event) OVERRIDE {
+    if (sender == close_button_) {

[sky, 2014/09/11 19:32:22]

nit: no {}

+      controller_->CloseWindow();
+    } else if (sender == maximize_button_) {
+      controller_->ToggleMaximize();
+    }
+  }
+
+  FrameController* controller_;
+  views::Button* close_button_;
+  views::Button* maximize_button_;
+
+  DISALLOW_COPY_AND_ASSIGN(LayoutManager);
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// FrameController, public:
+
+FrameController::FrameController(mojo::View* view, mojo::View** app_view)
+    : view_(view),
+      app_view_(mojo::View::Create(view->view_manager())),
+      frame_view_(new views::View),
+      frame_view_layout_manager_(new LayoutManager(this)),
+      widget_(new views::Widget),
+      maximized_(false) {
+  view_->AddChild(app_view_);
+  *app_view = app_view_;
+  frame_view_->set_background(
+      views::Background::CreateSolidBackground(SK_ColorBLUE));
+  frame_view_->SetLayoutManager(frame_view_layout_manager_);
+  views::Widget::InitParams params(
+      views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
+  params.native_widget = new mojo::NativeWidgetViewManager(widget_, view_);
+  params.bounds = gfx::Rect(view_->bounds().size());
+  widget_->Init(params);
+  widget_->SetContentsView(frame_view_);
+  widget_->Show();
+}
+
+FrameController::~FrameController() {}
+
+void FrameController::CloseWindow() {
+  mojo::View* first_child = view_->children().front();

[sky, 2014/09/11 19:32:22]

It's worth documenting why you need to delete only the first child.

+  first_child->Destroy();
+  view_->Destroy();
+}
+
+void FrameController::ToggleMaximize() {
+  if (!maximized_)
+    restored_bounds_ = view_->bounds();
+  maximized_ = !maximized_;
+  if (maximized_) {
+    view_->SetBounds(view_->parent()->bounds());
+  } else {
+    view_->SetBounds(restored_bounds_);
+  }
+}