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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/controls/image_view.h"
#include <utility>
#include "base/logging.h"
#include "base/strings/utf_string_conversions.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "ui/accessibility/ax_view_state.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/views/painter.h"
namespace views {
namespace {
// Returns the pixels for the bitmap in |image| at scale |image_scale|.
void* GetBitmapPixels(const gfx::ImageSkia& img, float image_scale) {
DCHECK_NE(0.0f, image_scale);
const SkBitmap& bitmap = img.GetRepresentation(image_scale).sk_bitmap();
SkAutoLockPixels pixel_lock(bitmap);
return bitmap.getPixels();
}
} // namespace
// static
const char ImageView::kViewClassName[] = "ImageView";
ImageView::ImageView()
: image_size_set_(false),
horiz_alignment_(CENTER),
vert_alignment_(CENTER),
interactive_(true),
last_paint_scale_(0.f),
last_painted_bitmap_pixels_(NULL),
focus_painter_(Painter::CreateDashedFocusPainter()) {
}
ImageView::~ImageView() {
}
void ImageView::SetImage(const gfx::ImageSkia& img) {
if (IsImageEqual(img))
return;
last_painted_bitmap_pixels_ = NULL;
gfx::Size pref_size(GetPreferredSize());
image_ = img;
if (pref_size != GetPreferredSize())
PreferredSizeChanged();
SchedulePaint();
}
void ImageView::SetImage(const gfx::ImageSkia* image_skia) {
if (image_skia) {
SetImage(*image_skia);
} else {
gfx::ImageSkia t;
SetImage(t);
}
}
const gfx::ImageSkia& ImageView::GetImage() {
return image_;
}
void ImageView::SetImageSize(const gfx::Size& image_size) {
image_size_set_ = true;
image_size_ = image_size;
PreferredSizeChanged();
}
gfx::Rect ImageView::GetImageBounds() const {
gfx::Size image_size = GetImageSize();
return gfx::Rect(ComputeImageOrigin(image_size), image_size);
}
void ImageView::ResetImageSize() {
image_size_set_ = false;
}
void ImageView::SetFocusPainter(scoped_ptr<Painter> focus_painter) {
focus_painter_ = std::move(focus_painter);
}
gfx::Size ImageView::GetPreferredSize() const {
gfx::Size size = GetImageSize();
size.Enlarge(GetInsets().width(), GetInsets().height());
return size;
}
bool ImageView::IsImageEqual(const gfx::ImageSkia& img) const {
// Even though we copy ImageSkia in SetImage() the backing store
// (ImageSkiaStorage) is not copied and may have changed since the last call
// to SetImage(). The expectation is that SetImage() with different pixels is
// treated as though the image changed. For this reason we compare not only
// the backing store but also the pixels of the last image we painted.
return image_.BackedBySameObjectAs(img) &&
last_paint_scale_ != 0.0f &&
last_painted_bitmap_pixels_ == GetBitmapPixels(img, last_paint_scale_);
}
gfx::Size ImageView::GetImageSize() const {
return image_size_set_ ? image_size_ : image_.size();
}
gfx::Point ImageView::ComputeImageOrigin(const gfx::Size& image_size) const {
gfx::Insets insets = GetInsets();
int x;
// In order to properly handle alignment of images in RTL locales, we need
// to flip the meaning of trailing and leading. For example, if the
// horizontal alignment is set to trailing, then we'll use left alignment for
// the image instead of right alignment if the UI layout is RTL.
Alignment actual_horiz_alignment = horiz_alignment_;
if (base::i18n::IsRTL() && (horiz_alignment_ != CENTER))
actual_horiz_alignment = (horiz_alignment_ == LEADING) ? TRAILING : LEADING;
switch (actual_horiz_alignment) {
case LEADING: x = insets.left(); break;
case TRAILING: x = width() - insets.right() - image_size.width(); break;
case CENTER: x = (width() - image_size.width()) / 2; break;
default: NOTREACHED(); x = 0; break;
}
int y;
switch (vert_alignment_) {
case LEADING: y = insets.top(); break;
case TRAILING: y = height() - insets.bottom() - image_size.height(); break;
case CENTER: y = (height() - image_size.height()) / 2; break;
default: NOTREACHED(); y = 0; break;
}
return gfx::Point(x, y);
}
void ImageView::OnFocus() {
View::OnFocus();
if (focus_painter_.get())
SchedulePaint();
}
void ImageView::OnBlur() {
View::OnBlur();
if (focus_painter_.get())
SchedulePaint();
}
void ImageView::OnPaint(gfx::Canvas* canvas) {
View::OnPaint(canvas);
OnPaintImage(canvas);
Painter::PaintFocusPainter(this, canvas, focus_painter_.get());
}
void ImageView::GetAccessibleState(ui::AXViewState* state) {
state->role = ui::AX_ROLE_IMAGE;
state->name = tooltip_text_;
}
const char* ImageView::GetClassName() const {
return kViewClassName;
}
void ImageView::SetHorizontalAlignment(Alignment ha) {
if (ha != horiz_alignment_) {
horiz_alignment_ = ha;
SchedulePaint();
}
}
ImageView::Alignment ImageView::GetHorizontalAlignment() const {
return horiz_alignment_;
}
void ImageView::SetVerticalAlignment(Alignment va) {
if (va != vert_alignment_) {
vert_alignment_ = va;
SchedulePaint();
}
}
ImageView::Alignment ImageView::GetVerticalAlignment() const {
return vert_alignment_;
}
void ImageView::SetTooltipText(const base::string16& tooltip) {
tooltip_text_ = tooltip;
}
base::string16 ImageView::GetTooltipText() const {
return tooltip_text_;
}
bool ImageView::GetTooltipText(const gfx::Point& p,
base::string16* tooltip) const {
if (tooltip_text_.empty())
return false;
*tooltip = GetTooltipText();
return true;
}
bool ImageView::CanProcessEventsWithinSubtree() const {
return interactive_;
}
void ImageView::OnPaintImage(gfx::Canvas* canvas) {
last_paint_scale_ = canvas->image_scale();
last_painted_bitmap_pixels_ = NULL;
if (image_.isNull())
return;
gfx::Rect image_bounds(GetImageBounds());
if (image_bounds.IsEmpty())
return;
if (image_bounds.size() != gfx::Size(image_.width(), image_.height())) {
// Resize case
SkPaint paint;
paint.setFilterQuality(kLow_SkFilterQuality);
canvas->DrawImageInt(image_, 0, 0, image_.width(), image_.height(),
image_bounds.x(), image_bounds.y(), image_bounds.width(),
image_bounds.height(), true, paint);
} else {
canvas->DrawImageInt(image_, image_bounds.x(), image_bounds.y());
}
last_painted_bitmap_pixels_ = GetBitmapPixels(image_, last_paint_scale_);
}
} // namespace views
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