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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ash/display/shared_display_edge_indicator.h"
      6 
      7 #include "ash/shell.h"
      8 #include "ash/shell_window_ids.h"
      9 #include "ash/wm/coordinate_conversion.h"
     10 #include "third_party/skia/include/core/SkColor.h"
     11 #include "ui/aura/client/screen_position_client.h"
     12 #include "ui/aura/root_window.h"
     13 #include "ui/gfx/animation/throb_animation.h"
     14 #include "ui/gfx/canvas.h"
     15 #include "ui/gfx/display.h"
     16 #include "ui/gfx/screen.h"
     17 #include "ui/views/view.h"
     18 #include "ui/views/widget/widget.h"
     19 
     20 namespace ash {
     21 namespace internal {
     22 namespace {
     23 
     24 const int kIndicatorAnimationDurationMs = 1000;
     25 
     26 class IndicatorView : public views::View {
     27  public:
     28   IndicatorView() {
     29   }
     30   virtual ~IndicatorView() {
     31   }
     32 
     33   void SetColor(SkColor color) {
     34     color_ = color;
     35     SchedulePaint();
     36   }
     37 
     38   // views::Views overrides:
     39   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
     40     canvas->FillRect(gfx::Rect(bounds().size()), color_);
     41   }
     42 
     43  private:
     44   SkColor color_;
     45   DISALLOW_COPY_AND_ASSIGN(IndicatorView);
     46 };
     47 
     48 views::Widget* CreateWidget(const gfx::Rect& bounds,
     49                             views::View* contents_view) {
     50   views::Widget* widget = new views::Widget;
     51   views::Widget::InitParams params(views::Widget::InitParams::TYPE_POPUP);
     52   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
     53   params.can_activate = false;
     54   params.keep_on_top = true;
     55   // We set the context to the primary root window; this is OK because the ash
     56   // stacking controller will still place us in the correct RootWindow.
     57   params.context = Shell::GetPrimaryRootWindow();
     58   widget->set_focus_on_creation(false);
     59   widget->Init(params);
     60   widget->SetVisibilityChangedAnimationsEnabled(false);
     61   widget->GetNativeWindow()->SetName("SharedEdgeIndicator");
     62   widget->SetContentsView(contents_view);
     63   gfx::Display display = Shell::GetScreen()->GetDisplayMatching(bounds);
     64   aura::Window* window = widget->GetNativeWindow();
     65   aura::client::ScreenPositionClient* screen_position_client =
     66       aura::client::GetScreenPositionClient(window->GetRootWindow());
     67   screen_position_client->SetBounds(window, bounds, display);
     68   widget->Show();
     69   return widget;
     70 }
     71 
     72 }  // namespace
     73 
     74 SharedDisplayEdgeIndicator::SharedDisplayEdgeIndicator()
     75     : src_indicator_(NULL),
     76       dst_indicator_(NULL) {
     77 }
     78 
     79 SharedDisplayEdgeIndicator::~SharedDisplayEdgeIndicator() {
     80   Hide();
     81 }
     82 
     83 void SharedDisplayEdgeIndicator::Show(const gfx::Rect& src_bounds,
     84                                       const gfx::Rect& dst_bounds) {
     85   DCHECK(!src_indicator_);
     86   DCHECK(!dst_indicator_);
     87   src_indicator_ = new IndicatorView;
     88   dst_indicator_ = new IndicatorView;
     89   CreateWidget(src_bounds, src_indicator_);
     90   CreateWidget(dst_bounds, dst_indicator_);
     91   animation_.reset(new gfx::ThrobAnimation(this));
     92   animation_->SetThrobDuration(kIndicatorAnimationDurationMs);
     93   animation_->StartThrobbing(-1 /* infinite */);
     94 }
     95 
     96 void SharedDisplayEdgeIndicator::Hide() {
     97   if (src_indicator_)
     98     src_indicator_->GetWidget()->Close();
     99   src_indicator_ = NULL;
    100   if (dst_indicator_)
    101     dst_indicator_->GetWidget()->Close();
    102   dst_indicator_ = NULL;
    103 }
    104 
    105 void SharedDisplayEdgeIndicator::AnimationProgressed(
    106     const gfx::Animation* animation) {
    107   int value = animation->CurrentValueBetween(0, 255);
    108   SkColor color = SkColorSetARGB(0xFF, value, value, value);
    109   if (src_indicator_)
    110     static_cast<IndicatorView*>(src_indicator_)->SetColor(color);
    111   if (dst_indicator_)
    112     static_cast<IndicatorView*>(dst_indicator_)->SetColor(color);
    113 
    114 }
    115 
    116 }  // namespace internal
    117 }  // namespace ash
    118