ui/message_center/views/proportional_image_view.cc

   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 "ui/message_center/views/proportional_image_view.h"
   6
   7 #include "ui/gfx/canvas.h"
   8 #include "ui/message_center/message_center_style.h"
   9
  10 namespace message_center {
  11
  12 const char ProportionalImageView::kViewClassName[] = "ProportionalImageView";
  13
  14 ProportionalImageView::ProportionalImageView(const gfx::Size& view_size)
  15     : view_size_(view_size) {}
  16
  17 ProportionalImageView::~ProportionalImageView() {}
  18
  19 void ProportionalImageView::SetImage(const gfx::ImageSkia& image,
  20                                      const gfx::Size& max_image_size) {
  21   image_ = image;
  22   max_image_size_ = max_image_size;
  23   SchedulePaint();
  24 }
  25
  26 gfx::Size ProportionalImageView::GetPreferredSize() const { return view_size_; }
  27
  28 int ProportionalImageView::GetHeightForWidth(int width) const {
  29   return view_size_.height();
  30 }
  31
  32 void ProportionalImageView::OnPaint(gfx::Canvas* canvas) {
  33   views::View::OnPaint(canvas);
  34
  35   gfx::Size draw_size = GetImageDrawingSize();
  36
  37   if (draw_size.IsEmpty())
  38     return;
  39
  40   gfx::Rect draw_bounds = GetContentsBounds();
  41   draw_bounds.ClampToCenteredSize(draw_size);
  42
  43   gfx::Size image_size(image_.size());
  44
  45   if (image_size == draw_size) {
  46     canvas->DrawImageInt(image_, draw_bounds.x(), draw_bounds.y());
  47   } else {
  48     SkPaint paint;
  49     paint.setFilterQuality(kLow_SkFilterQuality);
  50
  51     // This call resizes the image while drawing into the canvas.
  52     canvas->DrawImageInt(
  53         image_,
  54         0, 0, image_size.width(), image_size.height(),
  55         draw_bounds.x(), draw_bounds.y(), draw_size.width(), draw_size.height(),
  56         true,
  57         paint);
  58   }
  59 }
  60
  61 const char* ProportionalImageView::GetClassName() const {
  62   return kViewClassName;
  63 }
  64
  65 gfx::Size ProportionalImageView::GetImageDrawingSize() {
  66   if (!visible())
  67     return gfx::Size();
  68
  69   gfx::Size max_size = max_image_size_;
  70   max_size.SetToMin(GetContentsBounds().size());
  71   return message_center::GetImageSizeForContainerSize(max_size, image_.size());
  72 }
  73
  74 }  // namespace message_center