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.
InitLayer(ui::Layer * layer)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|.
ShowLayer(ui::Layer * layer,bool 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
ResizeShadow()45 ResizeShadow::ResizeShadow() : last_hit_test_(HTNOWHERE) {}
46
~ResizeShadow()47 ResizeShadow::~ResizeShadow() {}
48
Init(aura::Window * window)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
ShowForHitTest(int hit)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
Hide()100 void ResizeShadow::Hide() {
101 ShowForHitTest(HTNOWHERE);
102 }
103
Layout(const gfx::Rect & content_bounds)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
111