Aura: Support hovering restore & close buttons for full screen apps

chrome/browser/ui/views/frame/app_non_client_frame_view_aura.cc

+// Copyright (c) 2012 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/views/frame/app_non_client_frame_view_aura.h"
+
+#include "base/debug/stack_trace.h"
+#include "chrome/browser/ui/views/frame/browser_frame.h"
+#include "chrome/browser/ui/views/frame/browser_view.h"
+#include "grit/ui_resources.h"
+#include "ui/aura/window.h"
+#include "ui/base/animation/slide_animation.h"
+#include "ui/base/hit_test.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/compositor/layer.h"
+#include "ui/gfx/compositor/scoped_layer_animation_settings.h"
+#include "ui/gfx/image/image.h"
+#include "ui/gfx/point.h"
+#include "ui/gfx/rect.h"
+#include "ui/gfx/size.h"
+#include "ui/views/controls/button/image_button.h"
+#include "ui/views/widget/widget.h"
+#include "ui/views/window/non_client_view.h"
+
+namespace {
+// The number of pixels to use as a hover zone at the top of the screen.
+const int kTopMargin = 1;
+// How long the hover animation takes if uninterrupted.
+const int kHoverFadeDurationMs = 130;
+// The number of pixels within the shadow to draw the buttons.
+const int kShadowStart = 28;
+}
+
+class AppNonClientFrameViewAura::ControlView
+    : public views::View, public views::ButtonListener {
+ public:
+  explicit ControlView(AppNonClientFrameViewAura* owner) :
+      owner_(owner),
+      close_button_(CreateImageButton(IDR_AURA_WINDOW_FULLSCREEN_CLOSE)),
+      restore_button_(CreateImageButton(IDR_AURA_WINDOW_FULLSCREEN_RESTORE)) {
+    ResourceBundle& rb = ResourceBundle::GetSharedInstance();
+    separator_ =
+        *rb.GetImageNamed(IDR_AURA_WINDOW_FULLSCREEN_SEPARATOR).ToSkBitmap();
+    shadow_ = *rb.GetImageNamed(IDR_AURA_WINDOW_FULLSCREEN_SHADOW).ToSkBitmap();
+    AddChildView(close_button_);
+    AddChildView(restore_button_);
+  }
+
+  virtual void Layout() OVERRIDE {
+    restore_button_->SetPosition(gfx::Point(kShadowStart, 0));
+    close_button_->SetPosition(
+        gfx::Point(kShadowStart + close_button_->width() + separator_.width(),
+                   0));
+  }
+
+  virtual gfx::Size GetPreferredSize() OVERRIDE {
+    return gfx::Size(shadow_.width(), shadow_.height());
+  }
+
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
+    views::View::OnPaint(canvas);
+    canvas->DrawBitmapInt(
+        separator_, restore_button_->x() + restore_button_->width(), 0);
+    canvas->DrawBitmapInt(shadow_, 0, 0);
+  }
+
+  void ButtonPressed(
+      views::Button* sender,
+      const views::Event& event) OVERRIDE {
+    if (sender == close_button_)
+      owner_->Close();
+    else if (sender == restore_button_)
+      owner_->Restore();
+  }
+
+ private:
+  // Gets an image representing 3 bitmaps laid out horizontally that will be
+  // used as the normal, hot and pushed states for the created button.
+  views::ImageButton* CreateImageButton(int resource_id) {
+    views::ImageButton* button = new views::ImageButton(this);
+    const SkBitmap* all_images =
+        ResourceBundle::GetSharedInstance().GetImageNamed(
+            resource_id).ToSkBitmap();
+    int width = all_images->width() / 3;
+    int height = all_images->height();
+
+    SkBitmap normal, hot, pushed;
+    all_images->extractSubset(
+        &normal,
+        SkIRect::MakeXYWH(0, 0, width, height));
+    all_images->extractSubset(
+        &hot,
+        SkIRect::MakeXYWH(width, 0, width, height));
+    all_images->extractSubset(
+        &pushed,
+        SkIRect::MakeXYWH(2 * width, 0, width, height));
+    button->SetImage(views::CustomButton::BS_NORMAL, &normal);
+    button->SetImage(views::CustomButton::BS_HOT, &hot);
+    button->SetImage(views::CustomButton::BS_PUSHED, &pushed);
+
+    button->SizeToPreferredSize();
+    return button;
+  }
+
+  AppNonClientFrameViewAura* owner_;
+  views::ImageButton* close_button_;
+  views::ImageButton* restore_button_;
+  SkBitmap separator_;
+  SkBitmap shadow_;
+
+  DISALLOW_COPY_AND_ASSIGN(ControlView);
+};
+
+class AppNonClientFrameViewAura::Host : public views::MouseWatcherHost {
+ public:
+  explicit Host(AppNonClientFrameViewAura* owner) : owner_(owner) {}
+  virtual ~Host() {}
+
+  virtual bool Contains(
+      const gfx::Point& screen_point,
+      views::MouseWatcherHost::MouseEventType type) {
+    gfx::Rect top_margin = owner_->GetScreenBounds();
+    top_margin.set_height(kTopMargin);
+    gfx::Rect control_bounds = owner_->GetControlBounds();
+    control_bounds.Inset(kShadowStart, 0, 0, kShadowStart);
+    return top_margin.Contains(screen_point) ||
+        control_bounds.Contains(screen_point);
+  }
+
+  AppNonClientFrameViewAura* owner_;
+
+  DISALLOW_COPY_AND_ASSIGN(Host);
+};
+
+AppNonClientFrameViewAura::AppNonClientFrameViewAura(
+    BrowserFrame* frame, BrowserView* browser_view)
+    : BrowserNonClientFrameView(frame, browser_view),
+      control_view_(new ControlView(this)),
+      control_widget_(NULL),
+      ALLOW_THIS_IN_INITIALIZER_LIST(
+          mouse_watcher_(new Host(this), this)) {
+}
+
+AppNonClientFrameViewAura::~AppNonClientFrameViewAura() {
+  if (control_widget_) {
+    control_widget_->Close();
+  }
+}
+
+gfx::Rect AppNonClientFrameViewAura::GetBoundsForClientView() const {
+  gfx::Rect bounds = GetLocalBounds();
+  bounds.Inset(0, kTopMargin, 0,  0);
+  return bounds;
+}
+
+gfx::Rect AppNonClientFrameViewAura::GetWindowBoundsForClientBounds(
+    const gfx::Rect& client_bounds) const {
+  gfx::Rect bounds = client_bounds;
+  bounds.Inset(0, -kTopMargin, 0, 0);
+  return bounds;
+}
+
+int AppNonClientFrameViewAura::NonClientHitTest(
+    const gfx::Point& point) {
+  return bounds().Contains(point) ? HTCLIENT : HTNOWHERE;
+}
+
+void AppNonClientFrameViewAura::GetWindowMask(const gfx::Size& size,
+                                              gfx::Path* window_mask) {
+}
+
+void AppNonClientFrameViewAura::ResetWindowControls() {
+}
+
+void AppNonClientFrameViewAura::UpdateWindowIcon() {
+}
+
+gfx::Rect AppNonClientFrameViewAura::GetBoundsForTabStrip(
+    views::View* tabstrip) const {
+  return gfx::Rect();
+}
+
+int AppNonClientFrameViewAura::GetHorizontalTabStripVerticalOffset(
+    bool restored) const {
+  return 0;
+}
+
+void AppNonClientFrameViewAura::UpdateThrobber(bool running) {
+}
+
+void AppNonClientFrameViewAura::OnMouseEntered(
+    const views::MouseEvent& event) {
+  if (!control_widget_) {
+    control_widget_ = new views::Widget;
+    views::Widget::InitParams params(views::Widget::InitParams::TYPE_CONTROL);
+    params.parent = browser_view()->GetNativeHandle();
+    params.transparent = true;
+    control_widget_->Init(params);
+    control_widget_->SetContentsView(control_view_);
+    aura::Window* window = control_widget_->GetNativeView();
+    gfx::Rect control_bounds = GetControlBounds();
+    control_bounds.set_y(control_bounds.y() - control_bounds.height());
+    window->SetBounds(control_bounds);
+    control_widget_->Show();
+  }
+
+  ui::Layer* layer = control_widget_->GetNativeView()->layer();
+  ui::ScopedLayerAnimationSettings scoped_setter(layer->GetAnimator());
+  scoped_setter.SetTransitionDuration(
+      base::TimeDelta::FromMilliseconds(kHoverFadeDurationMs));
+  layer->SetBounds(GetControlBounds());
+  layer->SetOpacity(1);
+
+  mouse_watcher_.Start();
+}
+
+void AppNonClientFrameViewAura::MouseMovedOutOfHost() {
+  ui::Layer* layer = control_widget_->GetNativeView()->layer();
+
+  ui::ScopedLayerAnimationSettings scoped_setter(layer->GetAnimator());
+  scoped_setter.SetTransitionDuration(
+      base::TimeDelta::FromMilliseconds(kHoverFadeDurationMs));
+  gfx::Rect control_bounds = GetControlBounds();
+  control_bounds.set_y(control_bounds.y() - control_bounds.height());
+  layer->SetBounds(control_bounds);
+  layer->SetOpacity(0);
+}
+
+gfx::Rect AppNonClientFrameViewAura::GetControlBounds() const {
+  gfx::Size preferred = control_view_->GetPreferredSize();
+  gfx::Point location(width() - preferred.width(), 0);
+  ConvertPointToWidget(this, &location);
+  return gfx::Rect(
+      location.x(), location.y(),
+      preferred.width(), preferred.height());
+}
+
+void AppNonClientFrameViewAura::Close() {
+  control_widget_->Close();
+  control_widget_ = NULL;
+  mouse_watcher_.Stop();
+  frame()->Close();
+}
+
+void AppNonClientFrameViewAura::Restore() {
+  control_widget_->Close();
+  control_widget_ = NULL;
+  mouse_watcher_.Stop();
+  frame()->Restore();
+}