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/frame/caption_buttons/frame_caption_button.h"
6
7 #include "ui/base/resource/resource_bundle.h"
8 #include "ui/gfx/animation/slide_animation.h"
9 #include "ui/gfx/animation/throb_animation.h"
10 #include "ui/gfx/canvas.h"
11
12 namespace ash {
13
14 namespace {
15
16 // The duration of the crossfade animation when swapping the button's images.
17 const int kSwapImagesAnimationDurationMs = 200;
18
19 // The duration of the fade out animation of the old icon during a crossfade
20 // animation as a ratio of |kSwapImagesAnimationDurationMs|.
21 const float kFadeOutRatio = 0.5f;
22
23 } // namespace
24
25 // static
26 const char FrameCaptionButton::kViewClassName[] = "FrameCaptionButton";
27
FrameCaptionButton(views::ButtonListener * listener,CaptionButtonIcon icon)28 FrameCaptionButton::FrameCaptionButton(views::ButtonListener* listener,
29 CaptionButtonIcon icon)
30 : CustomButton(listener),
31 icon_(icon),
32 paint_as_active_(false),
33 alpha_(255),
34 icon_image_id_(-1),
35 inactive_icon_image_id_(-1),
36 hovered_background_image_id_(-1),
37 pressed_background_image_id_(-1),
38 swap_images_animation_(new gfx::SlideAnimation(this)) {
39 swap_images_animation_->Reset(1);
40
41 // Do not flip the gfx::Canvas passed to the OnPaint() method. The snap left
42 // and snap right button icons should not be flipped. The other icons are
43 // horizontally symmetrical.
44 }
45
~FrameCaptionButton()46 FrameCaptionButton::~FrameCaptionButton() {
47 }
48
SetImages(CaptionButtonIcon icon,Animate animate,int icon_image_id,int inactive_icon_image_id,int hovered_background_image_id,int pressed_background_image_id)49 void FrameCaptionButton::SetImages(CaptionButtonIcon icon,
50 Animate animate,
51 int icon_image_id,
52 int inactive_icon_image_id,
53 int hovered_background_image_id,
54 int pressed_background_image_id) {
55 // The early return is dependant on |animate| because callers use SetImages()
56 // with ANIMATE_NO to progress the crossfade animation to the end.
57 if (icon == icon_ &&
58 (animate == ANIMATE_YES || !swap_images_animation_->is_animating()) &&
59 icon_image_id == icon_image_id_ &&
60 inactive_icon_image_id == inactive_icon_image_id_ &&
61 hovered_background_image_id == hovered_background_image_id_ &&
62 pressed_background_image_id == pressed_background_image_id_) {
63 return;
64 }
65
66 if (animate == ANIMATE_YES)
67 crossfade_icon_image_ = GetIconImageToPaint();
68
69 icon_ = icon;
70 icon_image_id_ = icon_image_id;
71 inactive_icon_image_id_ = inactive_icon_image_id;
72 hovered_background_image_id_ = hovered_background_image_id;
73 pressed_background_image_id_ = pressed_background_image_id;
74
75 ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
76 icon_image_ = *rb.GetImageSkiaNamed(icon_image_id);
77 inactive_icon_image_ = *rb.GetImageSkiaNamed(inactive_icon_image_id);
78 hovered_background_image_ = *rb.GetImageSkiaNamed(
79 hovered_background_image_id);
80 pressed_background_image_ = *rb.GetImageSkiaNamed(
81 pressed_background_image_id);
82
83 if (animate == ANIMATE_YES) {
84 swap_images_animation_->Reset(0);
85 swap_images_animation_->SetSlideDuration(kSwapImagesAnimationDurationMs);
86 swap_images_animation_->Show();
87 } else {
88 swap_images_animation_->Reset(1);
89 }
90 PreferredSizeChanged();
91 SchedulePaint();
92 }
93
IsAnimatingImageSwap() const94 bool FrameCaptionButton::IsAnimatingImageSwap() const {
95 return swap_images_animation_->is_animating();
96 }
97
SetAlpha(int alpha)98 void FrameCaptionButton::SetAlpha(int alpha) {
99 if (alpha_ != alpha) {
100 alpha_ = alpha;
101 SchedulePaint();
102 }
103 }
104
GetPreferredSize() const105 gfx::Size FrameCaptionButton::GetPreferredSize() const {
106 return hovered_background_image_.isNull() ?
107 gfx::Size() : hovered_background_image_.size();
108 }
109
GetClassName() const110 const char* FrameCaptionButton::GetClassName() const {
111 return kViewClassName;
112 }
113
OnPaint(gfx::Canvas * canvas)114 void FrameCaptionButton::OnPaint(gfx::Canvas* canvas) {
115 if (hover_animation_->is_animating() || state() == STATE_HOVERED) {
116 int hovered_background_alpha = hover_animation_->is_animating() ?
117 hover_animation_->CurrentValueBetween(0, 255) : 255;
118 SkPaint paint;
119 paint.setAlpha(hovered_background_alpha);
120 canvas->DrawImageInt(hovered_background_image_, 0, 0, paint);
121 } else if (state() == STATE_PRESSED) {
122 canvas->DrawImageInt(pressed_background_image_, 0, 0);
123 }
124
125 int icon_alpha = swap_images_animation_->CurrentValueBetween(0, 255);
126 int crossfade_icon_alpha = 0;
127 if (icon_alpha < static_cast<int>(kFadeOutRatio * 255))
128 crossfade_icon_alpha = static_cast<int>(255 - icon_alpha / kFadeOutRatio);
129
130 gfx::ImageSkia icon_image = GetIconImageToPaint();
131 if (crossfade_icon_alpha > 0 && !crossfade_icon_image_.isNull()) {
132 gfx::Canvas icon_canvas(icon_image.size(), canvas->image_scale(), false);
133 SkPaint paint;
134 paint.setAlpha(icon_alpha);
135 icon_canvas.DrawImageInt(icon_image, 0, 0, paint);
136
137 paint.setAlpha(crossfade_icon_alpha);
138 paint.setXfermodeMode(SkXfermode::kPlus_Mode);
139 icon_canvas.DrawImageInt(crossfade_icon_image_, 0, 0, paint);
140
141 PaintCentered(canvas, gfx::ImageSkia(icon_canvas.ExtractImageRep()),
142 alpha_);
143 } else {
144 if (!swap_images_animation_->is_animating())
145 icon_alpha = alpha_;
146 PaintCentered(canvas, icon_image, icon_alpha);
147 }
148 }
149
OnGestureEvent(ui::GestureEvent * event)150 void FrameCaptionButton::OnGestureEvent(ui::GestureEvent* event) {
151 // CustomButton does not become pressed when the user drags off and then back
152 // onto the button. Make FrameCaptionButton pressed in this case because this
153 // behavior is more consistent with AlternateFrameSizeButton.
154 if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN ||
155 event->type() == ui::ET_GESTURE_SCROLL_UPDATE) {
156 if (HitTestPoint(event->location())) {
157 SetState(STATE_PRESSED);
158 RequestFocus();
159 event->StopPropagation();
160 } else {
161 SetState(STATE_NORMAL);
162 }
163 } else if (event->type() == ui::ET_GESTURE_SCROLL_END) {
164 if (HitTestPoint(event->location())) {
165 SetState(STATE_HOVERED);
166 NotifyClick(*event);
167 event->StopPropagation();
168 }
169 }
170 CustomButton::OnGestureEvent(event);
171 }
172
GetIconImageToPaint() const173 const gfx::ImageSkia& FrameCaptionButton::GetIconImageToPaint() const {
174 return paint_as_active_ ? icon_image_ : inactive_icon_image_;
175 }
176
PaintCentered(gfx::Canvas * canvas,const gfx::ImageSkia & to_center,int alpha)177 void FrameCaptionButton::PaintCentered(gfx::Canvas* canvas,
178 const gfx::ImageSkia& to_center,
179 int alpha) {
180 SkPaint paint;
181 paint.setAlpha(alpha);
182 canvas->DrawImageInt(to_center,
183 (width() - to_center.width()) / 2,
184 (height() - to_center.height()) / 2,
185 paint);
186 }
187
188 } // namespace ash
189