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 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 46 FrameCaptionButton::~FrameCaptionButton() { 47 } 48 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 94 bool FrameCaptionButton::IsAnimatingImageSwap() const { 95 return swap_images_animation_->is_animating(); 96 } 97 98 void FrameCaptionButton::SetAlpha(int alpha) { 99 if (alpha_ != alpha) { 100 alpha_ = alpha; 101 SchedulePaint(); 102 } 103 } 104 105 gfx::Size FrameCaptionButton::GetPreferredSize() const { 106 return hovered_background_image_.isNull() ? 107 gfx::Size() : hovered_background_image_.size(); 108 } 109 110 const char* FrameCaptionButton::GetClassName() const { 111 return kViewClassName; 112 } 113 114 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 } 149 150 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 } 172 173 const gfx::ImageSkia& FrameCaptionButton::GetIconImageToPaint() const { 174 return paint_as_active_ ? icon_image_ : inactive_icon_image_; 175 } 176 177 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