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 icon_image_id_(-1),
34 inactive_icon_image_id_(-1),
35 hovered_background_image_id_(-1),
36 pressed_background_image_id_(-1),
37 swap_images_animation_(new gfx::SlideAnimation(this)) {
38 swap_images_animation_->Reset(1);
39
40 // Do not flip the gfx::Canvas passed to the OnPaint() method. The snap left
41 // and snap right button icons should not be flipped. The other icons are
42 // horizontally symmetrical.
43 }
44
~FrameCaptionButton()45 FrameCaptionButton::~FrameCaptionButton() {
46 }
47
SetImages(CaptionButtonIcon icon,Animate animate,int icon_image_id,int inactive_icon_image_id,int hovered_background_image_id,int pressed_background_image_id)48 void FrameCaptionButton::SetImages(CaptionButtonIcon icon,
49 Animate animate,
50 int icon_image_id,
51 int inactive_icon_image_id,
52 int hovered_background_image_id,
53 int pressed_background_image_id) {
54 // The early return is dependant on |animate| because callers use SetImages()
55 // with ANIMATE_NO to progress the crossfade animation to the end.
56 if (icon == icon_ &&
57 (animate == ANIMATE_YES || !swap_images_animation_->is_animating()) &&
58 icon_image_id == icon_image_id_ &&
59 inactive_icon_image_id == inactive_icon_image_id_ &&
60 hovered_background_image_id == hovered_background_image_id_ &&
61 pressed_background_image_id == pressed_background_image_id_) {
62 return;
63 }
64
65 if (animate == ANIMATE_YES)
66 crossfade_icon_image_ = GetIconImageToPaint();
67
68 icon_ = icon;
69 icon_image_id_ = icon_image_id;
70 inactive_icon_image_id_ = inactive_icon_image_id;
71 hovered_background_image_id_ = hovered_background_image_id;
72 pressed_background_image_id_ = pressed_background_image_id;
73
74 ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
75 icon_image_ = *rb.GetImageSkiaNamed(icon_image_id);
76 inactive_icon_image_ = *rb.GetImageSkiaNamed(inactive_icon_image_id);
77 hovered_background_image_ = *rb.GetImageSkiaNamed(
78 hovered_background_image_id);
79 pressed_background_image_ = *rb.GetImageSkiaNamed(
80 pressed_background_image_id);
81
82 if (animate == ANIMATE_YES) {
83 swap_images_animation_->Reset(0);
84 swap_images_animation_->SetSlideDuration(kSwapImagesAnimationDurationMs);
85 swap_images_animation_->Show();
86 } else {
87 swap_images_animation_->Reset(1);
88 }
89 PreferredSizeChanged();
90 SchedulePaint();
91 }
92
IsAnimatingImageSwap() const93 bool FrameCaptionButton::IsAnimatingImageSwap() const {
94 return swap_images_animation_->is_animating();
95 }
96
GetPreferredSize() const97 gfx::Size FrameCaptionButton::GetPreferredSize() const {
98 return hovered_background_image_.isNull() ?
99 gfx::Size() : hovered_background_image_.size();
100 }
101
GetClassName() const102 const char* FrameCaptionButton::GetClassName() const {
103 return kViewClassName;
104 }
105
OnPaint(gfx::Canvas * canvas)106 void FrameCaptionButton::OnPaint(gfx::Canvas* canvas) {
107 if (hover_animation_->is_animating() || state() == STATE_HOVERED) {
108 int hovered_background_alpha = hover_animation_->is_animating() ?
109 hover_animation_->CurrentValueBetween(0, 255) : 255;
110 SkPaint paint;
111 paint.setAlpha(hovered_background_alpha);
112 canvas->DrawImageInt(hovered_background_image_, 0, 0, paint);
113 } else if (state() == STATE_PRESSED) {
114 canvas->DrawImageInt(pressed_background_image_, 0, 0);
115 }
116
117 int icon_alpha = swap_images_animation_->CurrentValueBetween(0, 255);
118 int crossfade_icon_alpha = 0;
119 if (icon_alpha < static_cast<int>(kFadeOutRatio * 255))
120 crossfade_icon_alpha = static_cast<int>(255 - icon_alpha / kFadeOutRatio);
121
122 gfx::ImageSkia icon_image = GetIconImageToPaint();
123 if (crossfade_icon_alpha > 0 && !crossfade_icon_image_.isNull()) {
124 gfx::Canvas icon_canvas(icon_image.size(), canvas->image_scale(), false);
125 SkPaint paint;
126 paint.setAlpha(icon_alpha);
127 icon_canvas.DrawImageInt(icon_image, 0, 0, paint);
128
129 paint.setAlpha(crossfade_icon_alpha);
130 paint.setXfermodeMode(SkXfermode::kPlus_Mode);
131 icon_canvas.DrawImageInt(crossfade_icon_image_, 0, 0, paint);
132
133 PaintCentered(canvas, gfx::ImageSkia(icon_canvas.ExtractImageRep()), 255);
134 } else {
135 PaintCentered(canvas, icon_image, icon_alpha);
136 }
137 }
138
OnGestureEvent(ui::GestureEvent * event)139 void FrameCaptionButton::OnGestureEvent(ui::GestureEvent* event) {
140 // CustomButton does not become pressed when the user drags off and then back
141 // onto the button. Make FrameCaptionButton pressed in this case because this
142 // behavior is more consistent with AlternateFrameSizeButton.
143 if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN ||
144 event->type() == ui::ET_GESTURE_SCROLL_UPDATE) {
145 if (HitTestPoint(event->location())) {
146 SetState(STATE_PRESSED);
147 RequestFocus();
148 event->StopPropagation();
149 } else {
150 SetState(STATE_NORMAL);
151 }
152 } else if (event->type() == ui::ET_GESTURE_SCROLL_END) {
153 if (HitTestPoint(event->location())) {
154 SetState(STATE_HOVERED);
155 NotifyClick(*event);
156 event->StopPropagation();
157 }
158 }
159 CustomButton::OnGestureEvent(event);
160 }
161
GetIconImageToPaint() const162 const gfx::ImageSkia& FrameCaptionButton::GetIconImageToPaint() const {
163 return paint_as_active_ ? icon_image_ : inactive_icon_image_;
164 }
165
PaintCentered(gfx::Canvas * canvas,const gfx::ImageSkia & to_center,int alpha)166 void FrameCaptionButton::PaintCentered(gfx::Canvas* canvas,
167 const gfx::ImageSkia& to_center,
168 int alpha) {
169 SkPaint paint;
170 paint.setAlpha(alpha);
171 canvas->DrawImageInt(to_center,
172 (width() - to_center.width()) / 2,
173 (height() - to_center.height()) / 2,
174 paint);
175 }
176
177 } // namespace ash
178