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1 // Copyright 2013 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/common/frame/caption_buttons/frame_caption_button.h" | |
6 | |
7 #include "ui/gfx/animation/slide_animation.h" | |
8 #include "ui/gfx/animation/throb_animation.h" | |
9 #include "ui/gfx/canvas.h" | |
10 #include "ui/gfx/color_palette.h" | |
11 #include "ui/gfx/paint_vector_icon.h" | |
12 #include "ui/gfx/vector_icons_public.h" | |
13 | |
14 namespace ash { | |
15 | |
16 namespace { | |
17 | |
18 // The duration of the crossfade animation when swapping the button's images. | |
19 const int kSwapImagesAnimationDurationMs = 200; | |
20 | |
21 // The duration of the fade out animation of the old icon during a crossfade | |
22 // animation as a ratio of |kSwapImagesAnimationDurationMs|. | |
23 const float kFadeOutRatio = 0.5f; | |
24 | |
25 // The alpha to draw inactive icons with. | |
26 const float kInactiveIconAlpha = 0.2f; | |
27 | |
28 // The colors and alpha values used for the button background hovered and | |
29 // pressed states. | |
30 // TODO(tdanderson|estade): Request these colors from ThemeProvider. | |
31 const int kHoveredAlpha = 0x14; | |
32 const int kPressedAlpha = 0x24; | |
33 | |
34 } // namespace | |
35 | |
36 // static | |
37 const char FrameCaptionButton::kViewClassName[] = "FrameCaptionButton"; | |
38 | |
39 FrameCaptionButton::FrameCaptionButton(views::ButtonListener* listener, | |
40 CaptionButtonIcon icon) | |
41 : CustomButton(listener), | |
42 icon_(icon), | |
43 paint_as_active_(false), | |
44 use_light_images_(false), | |
45 alpha_(255), | |
46 swap_images_animation_(new gfx::SlideAnimation(this)) { | |
47 set_animate_on_state_change(true); | |
48 swap_images_animation_->Reset(1); | |
49 | |
50 // Do not flip the gfx::Canvas passed to the OnPaint() method. The snap left | |
51 // and snap right button icons should not be flipped. The other icons are | |
52 // horizontally symmetrical. | |
53 } | |
54 | |
55 FrameCaptionButton::~FrameCaptionButton() {} | |
56 | |
57 void FrameCaptionButton::SetImage(CaptionButtonIcon icon, | |
58 Animate animate, | |
59 const gfx::VectorIcon& icon_definition) { | |
60 gfx::ImageSkia new_icon_image = gfx::CreateVectorIcon( | |
61 icon_definition, | |
62 use_light_images_ ? SK_ColorWHITE : gfx::kChromeIconGrey); | |
63 | |
64 // The early return is dependent on |animate| because callers use SetImage() | |
65 // with ANIMATE_NO to progress the crossfade animation to the end. | |
66 if (icon == icon_ && | |
67 (animate == ANIMATE_YES || !swap_images_animation_->is_animating()) && | |
68 new_icon_image.BackedBySameObjectAs(icon_image_)) { | |
69 return; | |
70 } | |
71 | |
72 if (animate == ANIMATE_YES) | |
73 crossfade_icon_image_ = icon_image_; | |
74 | |
75 icon_ = icon; | |
76 icon_definition_ = &icon_definition; | |
77 icon_image_ = new_icon_image; | |
78 | |
79 if (animate == ANIMATE_YES) { | |
80 swap_images_animation_->Reset(0); | |
81 swap_images_animation_->SetSlideDuration(kSwapImagesAnimationDurationMs); | |
82 swap_images_animation_->Show(); | |
83 } else { | |
84 swap_images_animation_->Reset(1); | |
85 } | |
86 PreferredSizeChanged(); | |
87 SchedulePaint(); | |
88 } | |
89 | |
90 bool FrameCaptionButton::IsAnimatingImageSwap() const { | |
91 return swap_images_animation_->is_animating(); | |
92 } | |
93 | |
94 void FrameCaptionButton::SetAlpha(int alpha) { | |
95 if (alpha_ != alpha) { | |
96 alpha_ = alpha; | |
97 SchedulePaint(); | |
98 } | |
99 } | |
100 | |
101 gfx::Size FrameCaptionButton::GetPreferredSize() const { | |
102 return size_; | |
103 } | |
104 | |
105 const char* FrameCaptionButton::GetClassName() const { | |
106 return kViewClassName; | |
107 } | |
108 | |
109 void FrameCaptionButton::OnPaint(gfx::Canvas* canvas) { | |
110 SkAlpha bg_alpha = SK_AlphaTRANSPARENT; | |
111 if (hover_animation().is_animating()) | |
112 bg_alpha = hover_animation().CurrentValueBetween(0, kHoveredAlpha); | |
113 else if (state() == STATE_HOVERED) | |
114 bg_alpha = kHoveredAlpha; | |
115 else if (state() == STATE_PRESSED) | |
116 bg_alpha = kPressedAlpha; | |
117 | |
118 if (bg_alpha != SK_AlphaTRANSPARENT) { | |
119 canvas->DrawColor(SkColorSetA( | |
120 use_light_images_ ? SK_ColorWHITE : SK_ColorBLACK, bg_alpha)); | |
121 } | |
122 | |
123 int icon_alpha = swap_images_animation_->CurrentValueBetween(0, 255); | |
124 int crossfade_icon_alpha = 0; | |
125 if (icon_alpha < static_cast<int>(kFadeOutRatio * 255)) | |
126 crossfade_icon_alpha = static_cast<int>(255 - icon_alpha / kFadeOutRatio); | |
127 | |
128 if (crossfade_icon_alpha > 0 && !crossfade_icon_image_.isNull()) { | |
129 gfx::Canvas icon_canvas(icon_image_.size(), canvas->image_scale(), false); | |
130 cc::PaintFlags flags; | |
131 flags.setAlpha(icon_alpha); | |
132 icon_canvas.DrawImageInt(icon_image_, 0, 0, flags); | |
133 | |
134 flags.setAlpha(crossfade_icon_alpha); | |
135 flags.setBlendMode(SkBlendMode::kPlus); | |
136 icon_canvas.DrawImageInt(crossfade_icon_image_, 0, 0, flags); | |
137 | |
138 PaintCentered(canvas, gfx::ImageSkia(icon_canvas.ExtractImageRep()), | |
139 alpha_); | |
140 } else { | |
141 if (!swap_images_animation_->is_animating()) | |
142 icon_alpha = alpha_; | |
143 PaintCentered(canvas, icon_image_, icon_alpha); | |
144 } | |
145 } | |
146 | |
147 void FrameCaptionButton::OnGestureEvent(ui::GestureEvent* event) { | |
148 // CustomButton does not become pressed when the user drags off and then back | |
149 // onto the button. Make FrameCaptionButton pressed in this case because this | |
150 // behavior is more consistent with AlternateFrameSizeButton. | |
151 if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN || | |
152 event->type() == ui::ET_GESTURE_SCROLL_UPDATE) { | |
153 if (HitTestPoint(event->location())) { | |
154 SetState(STATE_PRESSED); | |
155 RequestFocus(); | |
156 event->StopPropagation(); | |
157 } else { | |
158 SetState(STATE_NORMAL); | |
159 } | |
160 } else if (event->type() == ui::ET_GESTURE_SCROLL_END) { | |
161 if (HitTestPoint(event->location())) { | |
162 SetState(STATE_HOVERED); | |
163 NotifyClick(*event); | |
164 event->StopPropagation(); | |
165 } | |
166 } | |
167 CustomButton::OnGestureEvent(event); | |
168 } | |
169 | |
170 void FrameCaptionButton::PaintCentered(gfx::Canvas* canvas, | |
171 const gfx::ImageSkia& to_center, | |
172 int alpha) { | |
173 if (!paint_as_active_) { | |
174 // Paint icons as active when they are hovered over or pressed. | |
175 double inactive_alpha = kInactiveIconAlpha; | |
176 if (hover_animation().is_animating()) { | |
177 inactive_alpha = | |
178 hover_animation().CurrentValueBetween(inactive_alpha, 1.0f); | |
179 } else if (state() == STATE_PRESSED || state() == STATE_HOVERED) { | |
180 inactive_alpha = 1.0f; | |
181 } | |
182 alpha *= inactive_alpha; | |
183 } | |
184 | |
185 cc::PaintFlags flags; | |
186 flags.setAlpha(alpha); | |
187 canvas->DrawImageInt(to_center, (width() - to_center.width()) / 2, | |
188 (height() - to_center.height()) / 2, flags); | |
189 } | |
190 | |
191 } // namespace ash | |
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