ui/app_list/views/cached_label.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/app_list/views/cached_label.h"
   6
   7 #include "base/strings/utf_string_conversions.h"
   8 #include "ui/base/resource/resource_bundle.h"
   9 #include "ui/gfx/canvas.h"
  10
  11 namespace app_list {
  12
  13 CachedLabel::CachedLabel()
  14     : needs_repaint_(true) {
  15 }
  16
  17 void CachedLabel::PaintToBackingImage() {
  18   if (image_.size() == size() && !needs_repaint_)
  19     return;
  20
  21   bool is_opaque = SkColorGetA(background_color()) == 0xFF;
  22   gfx::Canvas canvas(size(), 1.0f, is_opaque);
  23   // If a background is provided, it will initialize the canvas in
  24   // View::OnPaintBackground(). Otherwise, the background must be set here.
  25   if (!background()) {
  26     canvas.FillRect(
  27         GetLocalBounds(), background_color(), SkXfermode::kSrc_Mode);
  28   }
  29   Label::OnPaint(&canvas);
  30   image_ = gfx::ImageSkia(canvas.ExtractImageRep());
  31   needs_repaint_ = false;
  32 }
  33
  34 #if defined(OS_WIN)
  35 void CachedLabel::OnPaint(gfx::Canvas* canvas) {
  36   PaintToBackingImage();
  37   canvas->DrawImageInt(image_, 0, 0);
  38 }
  39 #endif
  40
  41 }  // namespace app_list