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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/app_list/page_switcher.h" | |
6 | |
7 #include "ash/app_list/pagination_model.h" | |
8 #include "third_party/skia/include/core/SkPath.h" | |
9 #include "ui/base/animation/throb_animation.h" | |
10 #include "ui/gfx/canvas.h" | |
11 #include "ui/views/controls/button/custom_button.h" | |
12 #include "ui/views/layout/box_layout.h" | |
13 | |
14 namespace { | |
15 | |
16 const int kButtonSpacing = 10; | |
17 const int kButtonWidth = 60; | |
18 const int kButtonHeight = 6; | |
19 const int kButtonHeightPadding = 10; | |
20 const int kButtonCornerRadius = 2; | |
21 | |
22 // 0.16 black | |
23 const SkColor kHoverColor = SkColorSetARGB(0x2A, 0x00, 0x00, 0x00); | |
24 | |
25 // 0.2 black | |
26 const SkColor kNormalColor = SkColorSetARGB(0x33, 0x00, 0x00, 0x00); | |
27 | |
28 // 0.33 black | |
29 const SkColor kSelectedColor = SkColorSetARGB(0x55, 0x00, 0x00, 0x00); | |
30 | |
31 class PageSwitcherButton : public views::CustomButton { | |
32 public: | |
33 PageSwitcherButton(views::ButtonListener* listener) | |
34 : views::CustomButton(listener), | |
35 selected_(false) { | |
36 } | |
37 virtual ~PageSwitcherButton() {} | |
38 | |
39 void SetSelected(bool selected) { | |
40 if (selected == selected_) | |
41 return; | |
42 | |
43 selected_ = selected; | |
44 SchedulePaint(); | |
45 } | |
46 | |
47 // Overridden from views::View: | |
48 virtual gfx::Size GetPreferredSize() OVERRIDE { | |
49 return gfx::Size(kButtonWidth, kButtonHeight + kButtonHeightPadding); | |
50 } | |
51 | |
52 virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE { | |
53 if (selected_ || state() == BS_PUSHED) { | |
54 PaintButton(canvas, kSelectedColor); | |
55 } else if (state() == BS_HOT) { | |
56 PaintButton(canvas, kHoverColor); | |
57 } else { | |
58 PaintButton(canvas, kNormalColor); | |
59 } | |
60 } | |
61 | |
62 private: | |
63 // Paints a button that has two rounded corner at bottom. | |
64 void PaintButton(gfx::Canvas* canvas, SkColor color) { | |
65 gfx::Rect rect(GetContentsBounds()); | |
66 rect.set_height(kButtonHeight); | |
67 | |
68 gfx::Point center = rect.CenterPoint(); | |
69 | |
70 SkPath path; | |
71 path.incReserve(12); | |
72 path.moveTo(SkIntToScalar(rect.x()), SkIntToScalar(rect.y())); | |
73 path.arcTo(SkIntToScalar(rect.x()), SkIntToScalar(rect.bottom()), | |
74 SkIntToScalar(center.x()), SkIntToScalar(rect.bottom()), | |
75 SkIntToScalar(kButtonCornerRadius)); | |
76 path.arcTo(SkIntToScalar(rect.right()), SkIntToScalar(rect.bottom()), | |
77 SkIntToScalar(rect.right()), SkIntToScalar(rect.y()), | |
78 SkIntToScalar(kButtonCornerRadius)); | |
79 path.lineTo(SkIntToScalar(rect.right()), SkIntToScalar(rect.y())); | |
80 path.close(); | |
81 | |
82 SkPaint paint; | |
83 paint.setStyle(SkPaint::kFill_Style); | |
84 paint.setColor(color); | |
85 canvas->DrawPath(path, paint); | |
86 } | |
87 | |
88 bool selected_; | |
89 | |
90 DISALLOW_COPY_AND_ASSIGN(PageSwitcherButton); | |
91 }; | |
92 | |
93 // Gets PageSwitcherButton at |index| in |buttons|. | |
94 PageSwitcherButton* GetButtonByIndex(views::View* buttons, int index) { | |
95 return static_cast<PageSwitcherButton*>(buttons->child_at(index)); | |
96 } | |
97 | |
98 } // namespace | |
99 | |
100 namespace ash { | |
101 | |
102 PageSwitcher::PageSwitcher(PaginationModel* model) | |
103 : model_(model), | |
104 buttons_(NULL) { | |
105 buttons_ = new views::View; | |
106 buttons_->SetLayoutManager(new views::BoxLayout( | |
107 views::BoxLayout::kHorizontal, 0, 0, kButtonSpacing)); | |
108 AddChildView(buttons_); | |
109 | |
110 TotalPagesChanged(); | |
111 SelectedPageChanged(-1, model->selected_page()); | |
112 model_->AddObserver(this); | |
113 } | |
114 | |
115 PageSwitcher::~PageSwitcher() { | |
116 model_->RemoveObserver(this); | |
117 } | |
118 | |
119 gfx::Size PageSwitcher::GetPreferredSize() { | |
120 // Always return a size with correct height so that container resize is not | |
121 // needed when more pages are added. | |
122 return gfx::Size(kButtonWidth, kButtonHeight + kButtonHeightPadding); | |
123 } | |
124 | |
125 void PageSwitcher::Layout() { | |
126 gfx::Rect rect(GetContentsBounds()); | |
127 buttons_->SetBoundsRect(rect.Center(buttons_->GetPreferredSize())); | |
128 } | |
129 | |
130 void PageSwitcher::ButtonPressed(views::Button* sender, | |
131 const views::Event& event) { | |
132 for (int i = 0; i < buttons_->child_count(); ++i) { | |
133 if (sender == static_cast<views::Button*>(buttons_->child_at(i))) { | |
134 model_->SelectPage(i); | |
135 break; | |
136 } | |
137 } | |
138 } | |
139 | |
140 void PageSwitcher::TotalPagesChanged() { | |
141 buttons_->RemoveAllChildViews(true); | |
142 for (int i = 0; i < model_->total_pages(); ++i) { | |
143 PageSwitcherButton* button = new PageSwitcherButton(this); | |
144 button->SetSelected(i == model_->selected_page()); | |
145 buttons_->AddChildView(button); | |
146 } | |
147 buttons_->SetVisible(model_->total_pages() > 1); | |
148 Layout(); | |
149 } | |
150 | |
151 void PageSwitcher::SelectedPageChanged(int old_selected, int new_selected) { | |
152 if (old_selected >= 0 && old_selected < buttons_->child_count()) | |
153 GetButtonByIndex(buttons_, old_selected)->SetSelected(false); | |
154 if (new_selected >= 0 && new_selected < buttons_->child_count()) | |
155 GetButtonByIndex(buttons_, new_selected)->SetSelected(true); | |
156 } | |
157 | |
158 } // namespace ash | |
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