ash/wm/resize_shadow.cc

   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/wm/resize_shadow.h"
   6
   7 #include "base/time/time.h"
   8 #include "grit/ash_resources.h"
   9 #include "ui/aura/window.h"
  10 #include "ui/base/hit_test.h"
  11 #include "ui/base/resource/resource_bundle.h"
  12 #include "ui/compositor/layer.h"
  13 #include "ui/compositor/scoped_layer_animation_settings.h"
  14 #include "ui/views/corewm/image_grid.h"
  15
  16 namespace {
  17
  18 // Final opacity for resize effect.
  19 const float kShadowTargetOpacity = 0.25f;
  20 // Animation time for resize effect in milliseconds.
  21 const int kShadowAnimationDurationMs = 100;
  22
  23 // Sets up a layer as invisible and fully transparent, without animating.
  24 void InitLayer(ui::Layer* layer) {
  25   layer->SetVisible(false);
  26   layer->SetOpacity(0.f);
  27 }
  28
  29 // Triggers an opacity animation that will make |layer| become |visible|.
  30 void ShowLayer(ui::Layer* layer, bool visible) {
  31   ui::ScopedLayerAnimationSettings settings(layer->GetAnimator());
  32   settings.SetTransitionDuration(
  33       base::TimeDelta::FromMilliseconds(kShadowAnimationDurationMs));
  34   layer->SetOpacity(visible ? kShadowTargetOpacity : 0.f);
  35   // Sets the layer visibility after a delay, which will be identical to the
  36   // opacity animation duration.
  37   layer->SetVisible(visible);
  38 }
  39
  40 }  // namespace
  41
  42 namespace ash {
  43 namespace internal {
  44
  45 ResizeShadow::ResizeShadow() : last_hit_test_(HTNOWHERE) {}
  46
  47 ResizeShadow::~ResizeShadow() {}
  48
  49 void ResizeShadow::Init(aura::Window* window) {
  50   // Set up our image grid and images.
  51   ResourceBundle& res = ResourceBundle::GetSharedInstance();
  52   image_grid_.reset(new views::corewm::ImageGrid);
  53   image_grid_->SetImages(
  54       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_TOP_LEFT),
  55       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_TOP),
  56       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_TOP_RIGHT),
  57       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_LEFT),
  58       NULL,
  59       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_RIGHT),
  60       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_BOTTOM_LEFT),
  61       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_BOTTOM),
  62       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_BOTTOM_RIGHT));
  63   // Initialize all layers to invisible/transparent.
  64   InitLayer(image_grid_->top_left_layer());
  65   InitLayer(image_grid_->top_layer());
  66   InitLayer(image_grid_->top_right_layer());
  67   InitLayer(image_grid_->left_layer());
  68   InitLayer(image_grid_->right_layer());
  69   InitLayer(image_grid_->bottom_left_layer());
  70   InitLayer(image_grid_->bottom_layer());
  71   InitLayer(image_grid_->bottom_right_layer());
  72   // Add image grid as a child of the window's layer so it follows the window
  73   // as it moves.
  74   window->layer()->Add(image_grid_->layer());
  75 }
  76
  77 void ResizeShadow::ShowForHitTest(int hit) {
  78   // Don't start animations unless something changed.
  79   if (hit == last_hit_test_)
  80     return;
  81   last_hit_test_ = hit;
  82
  83   // Show affected corners.
  84   ShowLayer(image_grid_->top_left_layer(), hit == HTTOPLEFT);
  85   ShowLayer(image_grid_->top_right_layer(), hit == HTTOPRIGHT);
  86   ShowLayer(image_grid_->bottom_left_layer(), hit == HTBOTTOMLEFT);
  87   ShowLayer(image_grid_->bottom_right_layer(), hit == HTBOTTOMRIGHT);
  88
  89   // Show affected edges.
  90   ShowLayer(image_grid_->top_layer(),
  91             hit == HTTOPLEFT || hit == HTTOP || hit == HTTOPRIGHT);
  92   ShowLayer(image_grid_->left_layer(),
  93             hit == HTTOPLEFT || hit == HTLEFT || hit == HTBOTTOMLEFT);
  94   ShowLayer(image_grid_->right_layer(),
  95             hit == HTTOPRIGHT || hit == HTRIGHT || hit == HTBOTTOMRIGHT);
  96   ShowLayer(image_grid_->bottom_layer(),
  97             hit == HTBOTTOMLEFT || hit == HTBOTTOM || hit == HTBOTTOMRIGHT);
  98 }
  99
 100 void ResizeShadow::Hide() {
 101   ShowForHitTest(HTNOWHERE);
 102 }
 103
 104 void ResizeShadow::Layout(const gfx::Rect& content_bounds) {
 105   gfx::Rect local_bounds(content_bounds.size());
 106   image_grid_->SetContentBounds(local_bounds);
 107 }
 108
 109 }  // namespace internal
 110 }  // namespace ash