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/wm/core/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
  44 ResizeShadow::ResizeShadow() : last_hit_test_(HTNOWHERE) {}
  45
  46 ResizeShadow::~ResizeShadow() {}
  47
  48 void ResizeShadow::Init(aura::Window* window) {
  49   // Set up our image grid and images.
  50   ResourceBundle& res = ResourceBundle::GetSharedInstance();
  51   image_grid_.reset(new ::wm::ImageGrid);
  52   image_grid_->SetImages(
  53       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_TOP_LEFT),
  54       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_TOP),
  55       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_TOP_RIGHT),
  56       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_LEFT),
  57       NULL,
  58       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_RIGHT),
  59       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_BOTTOM_LEFT),
  60       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_BOTTOM),
  61       &res.GetImageNamed(IDR_AURA_RESIZE_SHADOW_BOTTOM_RIGHT));
  62   // Initialize all layers to invisible/transparent.
  63   InitLayer(image_grid_->top_left_layer());
  64   InitLayer(image_grid_->top_layer());
  65   InitLayer(image_grid_->top_right_layer());
  66   InitLayer(image_grid_->left_layer());
  67   InitLayer(image_grid_->right_layer());
  68   InitLayer(image_grid_->bottom_left_layer());
  69   InitLayer(image_grid_->bottom_layer());
  70   InitLayer(image_grid_->bottom_right_layer());
  71   // Add image grid as a child of the window's layer so it follows the window
  72   // as it moves.
  73   window->layer()->Add(image_grid_->layer());
  74 }
  75
  76 void ResizeShadow::ShowForHitTest(int hit) {
  77   // Don't start animations unless something changed.
  78   if (hit == last_hit_test_)
  79     return;
  80   last_hit_test_ = hit;
  81
  82   // Show affected corners.
  83   ShowLayer(image_grid_->top_left_layer(), hit == HTTOPLEFT);
  84   ShowLayer(image_grid_->top_right_layer(), hit == HTTOPRIGHT);
  85   ShowLayer(image_grid_->bottom_left_layer(), hit == HTBOTTOMLEFT);
  86   ShowLayer(image_grid_->bottom_right_layer(), hit == HTBOTTOMRIGHT);
  87
  88   // Show affected edges.
  89   ShowLayer(image_grid_->top_layer(),
  90             hit == HTTOPLEFT || hit == HTTOP || hit == HTTOPRIGHT);
  91   ShowLayer(image_grid_->left_layer(),
  92             hit == HTTOPLEFT || hit == HTLEFT || hit == HTBOTTOMLEFT);
  93   ShowLayer(image_grid_->right_layer(),
  94             hit == HTTOPRIGHT || hit == HTRIGHT || hit == HTBOTTOMRIGHT);
  95   ShowLayer(image_grid_->bottom_layer(),
  96             hit == HTBOTTOMLEFT || hit == HTBOTTOM || hit == HTBOTTOMRIGHT);
  97 }
  98
  99 void ResizeShadow::Hide() {
 100   ShowForHitTest(HTNOWHERE);
 101 }
 102
 103 void ResizeShadow::Layout(const gfx::Rect& content_bounds) {
 104   gfx::Rect local_bounds(content_bounds.size());
 105   image_grid_->SetContentBounds(local_bounds);
 106 }
 107
 108 }  // namespace ash