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 "ui/views/controls/button/image_button.h" 6 7 #include "base/strings/utf_string_conversions.h" 8 #include "ui/base/accessibility/accessible_view_state.h" 9 #include "ui/base/animation/throb_animation.h" 10 #include "ui/gfx/canvas.h" 11 #include "ui/gfx/image/image_skia_operations.h" 12 #include "ui/views/widget/widget.h" 13 14 namespace views { 15 16 static const int kDefaultWidth = 16; // Default button width if no theme. 17 static const int kDefaultHeight = 14; // Default button height if no theme. 18 19 //////////////////////////////////////////////////////////////////////////////// 20 // ImageButton, public: 21 22 ImageButton::ImageButton(ButtonListener* listener) 23 : CustomButton(listener), 24 h_alignment_(ALIGN_LEFT), 25 v_alignment_(ALIGN_TOP), 26 preferred_size_(kDefaultWidth, kDefaultHeight) { 27 // By default, we request that the gfx::Canvas passed to our View::OnPaint() 28 // implementation is flipped horizontally so that the button's images are 29 // mirrored when the UI directionality is right-to-left. 30 EnableCanvasFlippingForRTLUI(true); 31 } 32 33 ImageButton::~ImageButton() { 34 } 35 36 const gfx::ImageSkia& ImageButton::GetImage(ButtonState state) const { 37 return images_[state]; 38 } 39 40 void ImageButton::SetImage(ButtonState state, const gfx::ImageSkia* image) { 41 images_[state] = image ? *image : gfx::ImageSkia(); 42 PreferredSizeChanged(); 43 } 44 45 void ImageButton::SetBackground(SkColor color, 46 const gfx::ImageSkia* image, 47 const gfx::ImageSkia* mask) { 48 if (image == NULL || mask == NULL) { 49 background_image_ = gfx::ImageSkia(); 50 return; 51 } 52 53 background_image_ = gfx::ImageSkiaOperations::CreateButtonBackground(color, 54 *image, *mask); 55 } 56 57 void ImageButton::SetOverlayImage(const gfx::ImageSkia* image) { 58 if (!image) { 59 overlay_image_ = gfx::ImageSkia(); 60 return; 61 } 62 overlay_image_ = *image; 63 } 64 65 void ImageButton::SetImageAlignment(HorizontalAlignment h_align, 66 VerticalAlignment v_align) { 67 h_alignment_ = h_align; 68 v_alignment_ = v_align; 69 SchedulePaint(); 70 } 71 72 //////////////////////////////////////////////////////////////////////////////// 73 // ImageButton, View overrides: 74 75 gfx::Size ImageButton::GetPreferredSize() { 76 gfx::Size size = preferred_size_; 77 if (!images_[STATE_NORMAL].isNull()) { 78 size = gfx::Size(images_[STATE_NORMAL].width(), 79 images_[STATE_NORMAL].height()); 80 } 81 82 gfx::Insets insets = GetInsets(); 83 size.Enlarge(insets.width(), insets.height()); 84 return size; 85 } 86 87 void ImageButton::OnPaint(gfx::Canvas* canvas) { 88 // Call the base class first to paint any background/borders. 89 View::OnPaint(canvas); 90 91 gfx::ImageSkia img = GetImageToPaint(); 92 93 if (!img.isNull()) { 94 gfx::Point position = ComputeImagePaintPosition(img); 95 if (!background_image_.isNull()) 96 canvas->DrawImageInt(background_image_, position.x(), position.y()); 97 98 canvas->DrawImageInt(img, position.x(), position.y()); 99 100 if (!overlay_image_.isNull()) 101 canvas->DrawImageInt(overlay_image_, position.x(), position.y()); 102 } 103 OnPaintFocusBorder(canvas); 104 } 105 106 //////////////////////////////////////////////////////////////////////////////// 107 // ImageButton, protected: 108 109 gfx::ImageSkia ImageButton::GetImageToPaint() { 110 gfx::ImageSkia img; 111 112 if (!images_[STATE_HOVERED].isNull() && hover_animation_->is_animating()) { 113 img = gfx::ImageSkiaOperations::CreateBlendedImage(images_[STATE_NORMAL], 114 images_[STATE_HOVERED], hover_animation_->GetCurrentValue()); 115 } else { 116 img = images_[state_]; 117 } 118 119 return !img.isNull() ? img : images_[STATE_NORMAL]; 120 } 121 122 //////////////////////////////////////////////////////////////////////////////// 123 // ImageButton, private: 124 125 gfx::Point ImageButton::ComputeImagePaintPosition(const gfx::ImageSkia& image) { 126 int x = 0, y = 0; 127 gfx::Rect rect = GetContentsBounds(); 128 129 if (h_alignment_ == ALIGN_CENTER) 130 x = (rect.width() - image.width()) / 2; 131 else if (h_alignment_ == ALIGN_RIGHT) 132 x = rect.width() - image.width(); 133 134 if (v_alignment_ == ALIGN_MIDDLE) 135 y = (rect.height() - image.height()) / 2; 136 else if (v_alignment_ == ALIGN_BOTTOM) 137 y = rect.height() - image.height(); 138 139 x += rect.x(); 140 y += rect.y(); 141 142 return gfx::Point(x, y); 143 } 144 145 //////////////////////////////////////////////////////////////////////////////// 146 // ToggleImageButton, public: 147 148 ToggleImageButton::ToggleImageButton(ButtonListener* listener) 149 : ImageButton(listener), 150 toggled_(false) { 151 } 152 153 ToggleImageButton::~ToggleImageButton() { 154 } 155 156 void ToggleImageButton::SetToggled(bool toggled) { 157 if (toggled == toggled_) 158 return; 159 160 for (int i = 0; i < STATE_COUNT; ++i) { 161 gfx::ImageSkia temp = images_[i]; 162 images_[i] = alternate_images_[i]; 163 alternate_images_[i] = temp; 164 } 165 toggled_ = toggled; 166 SchedulePaint(); 167 168 NotifyAccessibilityEvent(ui::AccessibilityTypes::EVENT_VALUE_CHANGED, true); 169 } 170 171 void ToggleImageButton::SetToggledImage(ButtonState state, 172 const gfx::ImageSkia* image) { 173 if (toggled_) { 174 images_[state] = image ? *image : gfx::ImageSkia(); 175 if (state_ == state) 176 SchedulePaint(); 177 } else { 178 alternate_images_[state] = image ? *image : gfx::ImageSkia(); 179 } 180 } 181 182 void ToggleImageButton::SetToggledTooltipText(const string16& tooltip) { 183 toggled_tooltip_text_ = tooltip; 184 } 185 186 //////////////////////////////////////////////////////////////////////////////// 187 // ToggleImageButton, ImageButton overrides: 188 189 const gfx::ImageSkia& ToggleImageButton::GetImage(ButtonState state) const { 190 if (toggled_) 191 return alternate_images_[state]; 192 return images_[state]; 193 } 194 195 void ToggleImageButton::SetImage(ButtonState state, 196 const gfx::ImageSkia* image) { 197 if (toggled_) { 198 alternate_images_[state] = image ? *image : gfx::ImageSkia(); 199 } else { 200 images_[state] = image ? *image : gfx::ImageSkia(); 201 if (state_ == state) 202 SchedulePaint(); 203 } 204 PreferredSizeChanged(); 205 } 206 207 //////////////////////////////////////////////////////////////////////////////// 208 // ToggleImageButton, View overrides: 209 210 bool ToggleImageButton::GetTooltipText(const gfx::Point& p, 211 string16* tooltip) const { 212 if (!toggled_ || toggled_tooltip_text_.empty()) 213 return Button::GetTooltipText(p, tooltip); 214 215 *tooltip = toggled_tooltip_text_; 216 return true; 217 } 218 219 void ToggleImageButton::GetAccessibleState(ui::AccessibleViewState* state) { 220 ImageButton::GetAccessibleState(state); 221 GetTooltipText(gfx::Point(), &state->name); 222 } 223 224 } // namespace views 225
