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/image_view.h"
6
7 #include "base/logging.h"
8 #include "base/strings/utf_string_conversions.h"
9 #include "third_party/skia/include/core/SkPaint.h"
10 #include "ui/base/accessibility/accessible_view_state.h"
11 #include "ui/gfx/canvas.h"
12 #include "ui/gfx/insets.h"
13 #include "ui/views/painter.h"
14
15 namespace views {
16
ImageView()17 ImageView::ImageView()
18 : image_size_set_(false),
19 horiz_alignment_(CENTER),
20 vert_alignment_(CENTER),
21 interactive_(true),
22 last_paint_scale_(0.f),
23 last_painted_bitmap_pixels_(NULL),
24 focus_painter_(Painter::CreateDashedFocusPainter()) {
25 }
26
~ImageView()27 ImageView::~ImageView() {
28 }
29
SetImage(const gfx::ImageSkia & img)30 void ImageView::SetImage(const gfx::ImageSkia& img) {
31 if (IsImageEqual(img))
32 return;
33
34 last_painted_bitmap_pixels_ = NULL;
35 gfx::Size pref_size(GetPreferredSize());
36 image_ = img;
37 if (pref_size != GetPreferredSize())
38 PreferredSizeChanged();
39 SchedulePaint();
40 }
41
SetImage(const gfx::ImageSkia * image_skia)42 void ImageView::SetImage(const gfx::ImageSkia* image_skia) {
43 if (image_skia) {
44 SetImage(*image_skia);
45 } else {
46 gfx::ImageSkia t;
47 SetImage(t);
48 }
49 }
50
GetImage()51 const gfx::ImageSkia& ImageView::GetImage() {
52 return image_;
53 }
54
SetImageSize(const gfx::Size & image_size)55 void ImageView::SetImageSize(const gfx::Size& image_size) {
56 image_size_set_ = true;
57 image_size_ = image_size;
58 PreferredSizeChanged();
59 }
60
GetImageSize(gfx::Size * image_size)61 bool ImageView::GetImageSize(gfx::Size* image_size) {
62 DCHECK(image_size);
63 if (image_size_set_)
64 *image_size = image_size_;
65 return image_size_set_;
66 }
67
GetImageBounds() const68 gfx::Rect ImageView::GetImageBounds() const {
69 gfx::Size image_size(image_size_set_ ?
70 image_size_ : gfx::Size(image_.width(), image_.height()));
71 return gfx::Rect(ComputeImageOrigin(image_size), image_size);
72 }
73
ResetImageSize()74 void ImageView::ResetImageSize() {
75 image_size_set_ = false;
76 }
77
SetFocusPainter(scoped_ptr<Painter> focus_painter)78 void ImageView::SetFocusPainter(scoped_ptr<Painter> focus_painter) {
79 focus_painter_ = focus_painter.Pass();
80 }
81
GetPreferredSize()82 gfx::Size ImageView::GetPreferredSize() {
83 gfx::Insets insets = GetInsets();
84 if (image_size_set_) {
85 gfx::Size image_size;
86 GetImageSize(&image_size);
87 image_size.Enlarge(insets.width(), insets.height());
88 return image_size;
89 }
90 return gfx::Size(image_.width() + insets.width(),
91 image_.height() + insets.height());
92 }
93
IsImageEqual(const gfx::ImageSkia & img) const94 bool ImageView::IsImageEqual(const gfx::ImageSkia& img) const {
95 // Even though we copy ImageSkia in SetImage() the backing store
96 // (ImageSkiaStorage) is not copied and may have changed since the last call
97 // to SetImage(). The expectation is that SetImage() with different pixels is
98 // treated as though the image changed. For this reason we compare not only
99 // the backing store but also the pixels of the last image we painted.
100 return image_.BackedBySameObjectAs(img) &&
101 last_paint_scale_ != 0.0f &&
102 last_painted_bitmap_pixels_ ==
103 img.GetRepresentation(last_paint_scale_).sk_bitmap().getPixels();
104 }
105
ComputeImageOrigin(const gfx::Size & image_size) const106 gfx::Point ImageView::ComputeImageOrigin(const gfx::Size& image_size) const {
107 gfx::Insets insets = GetInsets();
108
109 int x;
110 // In order to properly handle alignment of images in RTL locales, we need
111 // to flip the meaning of trailing and leading. For example, if the
112 // horizontal alignment is set to trailing, then we'll use left alignment for
113 // the image instead of right alignment if the UI layout is RTL.
114 Alignment actual_horiz_alignment = horiz_alignment_;
115 if (base::i18n::IsRTL() && (horiz_alignment_ != CENTER))
116 actual_horiz_alignment = (horiz_alignment_ == LEADING) ? TRAILING : LEADING;
117 switch (actual_horiz_alignment) {
118 case LEADING: x = insets.left(); break;
119 case TRAILING: x = width() - insets.right() - image_size.width(); break;
120 case CENTER: x = (width() - image_size.width()) / 2; break;
121 default: NOTREACHED(); x = 0; break;
122 }
123
124 int y;
125 switch (vert_alignment_) {
126 case LEADING: y = insets.top(); break;
127 case TRAILING: y = height() - insets.bottom() - image_size.height(); break;
128 case CENTER: y = (height() - image_size.height()) / 2; break;
129 default: NOTREACHED(); y = 0; break;
130 }
131
132 return gfx::Point(x, y);
133 }
134
OnFocus()135 void ImageView::OnFocus() {
136 View::OnFocus();
137 if (focus_painter_.get())
138 SchedulePaint();
139 }
140
OnBlur()141 void ImageView::OnBlur() {
142 View::OnBlur();
143 if (focus_painter_.get())
144 SchedulePaint();
145 }
146
OnPaint(gfx::Canvas * canvas)147 void ImageView::OnPaint(gfx::Canvas* canvas) {
148 View::OnPaint(canvas);
149 OnPaintImage(canvas);
150 Painter::PaintFocusPainter(this, canvas, focus_painter_.get());
151 }
152
GetAccessibleState(ui::AccessibleViewState * state)153 void ImageView::GetAccessibleState(ui::AccessibleViewState* state) {
154 state->role = ui::AccessibilityTypes::ROLE_GRAPHIC;
155 state->name = tooltip_text_;
156 }
157
SetHorizontalAlignment(Alignment ha)158 void ImageView::SetHorizontalAlignment(Alignment ha) {
159 if (ha != horiz_alignment_) {
160 horiz_alignment_ = ha;
161 SchedulePaint();
162 }
163 }
164
GetHorizontalAlignment() const165 ImageView::Alignment ImageView::GetHorizontalAlignment() const {
166 return horiz_alignment_;
167 }
168
SetVerticalAlignment(Alignment va)169 void ImageView::SetVerticalAlignment(Alignment va) {
170 if (va != vert_alignment_) {
171 vert_alignment_ = va;
172 SchedulePaint();
173 }
174 }
175
GetVerticalAlignment() const176 ImageView::Alignment ImageView::GetVerticalAlignment() const {
177 return vert_alignment_;
178 }
179
SetTooltipText(const string16 & tooltip)180 void ImageView::SetTooltipText(const string16& tooltip) {
181 tooltip_text_ = tooltip;
182 }
183
GetTooltipText() const184 string16 ImageView::GetTooltipText() const {
185 return tooltip_text_;
186 }
187
GetTooltipText(const gfx::Point & p,string16 * tooltip) const188 bool ImageView::GetTooltipText(const gfx::Point& p, string16* tooltip) const {
189 if (tooltip_text_.empty())
190 return false;
191
192 *tooltip = GetTooltipText();
193 return true;
194 }
195
HitTestRect(const gfx::Rect & rect) const196 bool ImageView::HitTestRect(const gfx::Rect& rect) const {
197 return interactive_ ? View::HitTestRect(rect) : false;
198 }
199
200
OnPaintImage(gfx::Canvas * canvas)201 void ImageView::OnPaintImage(gfx::Canvas* canvas) {
202 last_paint_scale_ = canvas->image_scale();
203 last_painted_bitmap_pixels_ = NULL;
204
205 if (image_.isNull())
206 return;
207
208 gfx::Rect image_bounds(GetImageBounds());
209 if (image_bounds.IsEmpty())
210 return;
211
212 if (image_bounds.size() != gfx::Size(image_.width(), image_.height())) {
213 // Resize case
214 SkPaint paint;
215 paint.setFilterBitmap(true);
216 canvas->DrawImageInt(image_, 0, 0, image_.width(), image_.height(),
217 image_bounds.x(), image_bounds.y(), image_bounds.width(),
218 image_bounds.height(), true, paint);
219 } else {
220 canvas->DrawImageInt(image_, image_bounds.x(), image_bounds.y());
221 }
222 last_painted_bitmap_pixels_ =
223 image_.GetRepresentation(last_paint_scale_).sk_bitmap().getPixels();
224 }
225
226 } // namespace views
227