ash/shelf/overflow_button.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 "ash/shelf/overflow_button.h"
   6
   7 #include "ash/ash_switches.h"
   8 #include "ash/shelf/shelf_layout_manager.h"
   9 #include "ash/shelf/shelf_widget.h"
  10 #include "grit/ash_resources.h"
  11 #include "grit/ash_strings.h"
  12 #include "third_party/skia/include/core/SkPaint.h"
  13 #include "third_party/skia/include/core/SkPath.h"
  14 #include "ui/base/l10n/l10n_util.h"
  15 #include "ui/base/resource/resource_bundle.h"
  16 #include "ui/gfx/animation/throb_animation.h"
  17 #include "ui/gfx/canvas.h"
  18 #include "ui/gfx/image/image_skia_operations.h"
  19 #include "ui/gfx/skbitmap_operations.h"
  20 #include "ui/gfx/skia_util.h"
  21 #include "ui/gfx/transform.h"
  22 #include "ui/views/widget/widget.h"
  23
  24 namespace ash {
  25 namespace {
  26
  27 const int kButtonHoverAlpha = 150;
  28
  29 const int kButtonCornerRadius = 2;
  30
  31 const int kButtonHoverSize = 28;
  32
  33 const int kBackgroundOffset = (48 - kButtonHoverSize) / 2;
  34
  35 }  // namesapce
  36
  37 OverflowButton::OverflowButton(views::ButtonListener* listener)
  38     : CustomButton(listener),
  39       bottom_image_(NULL) {
  40   ui::ResourceBundle* rb = &ui::ResourceBundle::GetSharedInstance();
  41   bottom_image_ = rb->GetImageNamed(IDR_ASH_SHELF_OVERFLOW).ToImageSkia();
  42
  43   SetAccessibilityFocusable(true);
  44   SetAccessibleName(l10n_util::GetStringUTF16(IDS_ASH_SHELF_OVERFLOW_NAME));
  45 }
  46
  47 OverflowButton::~OverflowButton() {}
  48
  49 void OverflowButton::OnShelfAlignmentChanged() {
  50   SchedulePaint();
  51 }
  52
  53 void OverflowButton::PaintBackground(gfx::Canvas* canvas, int alpha) {
  54   gfx::Rect bounds(GetContentsBounds());
  55   gfx::Rect rect(0, 0, kButtonHoverSize, kButtonHoverSize);
  56   ShelfLayoutManager* shelf =
  57       ShelfLayoutManager::ForShelf(GetWidget()->GetNativeView());
  58
  59   // Nudge the background a little to line up right.
  60   if (shelf->IsHorizontalAlignment()) {
  61     rect.set_origin(gfx::Point(
  62         bounds.x() + ((bounds.width() - kButtonHoverSize) / 2) - 1,
  63         bounds.y() + kBackgroundOffset - 1));
  64
  65   } else {
  66     rect.set_origin(gfx::Point(
  67         bounds.x() + kBackgroundOffset - 1,
  68         bounds.y() + ((bounds.height() - kButtonHoverSize) / 2) - 1));
  69   }
  70
  71   SkPaint paint;
  72   paint.setAntiAlias(true);
  73   paint.setStyle(SkPaint::kFill_Style);
  74   paint.setColor(SkColorSetARGB(
  75       kButtonHoverAlpha * hover_animation_->GetCurrentValue(),
  76       0, 0, 0));
  77
  78   const SkScalar radius = SkIntToScalar(kButtonCornerRadius);
  79   SkPath path;
  80   path.addRoundRect(gfx::RectToSkRect(rect), radius, radius);
  81   canvas->DrawPath(path, paint);
  82 }
  83
  84 void OverflowButton::OnPaint(gfx::Canvas* canvas) {
  85   ShelfLayoutManager* layout_manager =
  86       ShelfLayoutManager::ForShelf(GetWidget()->GetNativeView());
  87   ShelfAlignment alignment = layout_manager->GetAlignment();
  88
  89   gfx::Rect bounds(GetContentsBounds());
  90   ResourceBundle& rb = ResourceBundle::GetSharedInstance();
  91   int background_image_id = 0;
  92   if (layout_manager->shelf_widget()->shelf()->IsShowingOverflowBubble())
  93     background_image_id = IDR_AURA_NOTIFICATION_BACKGROUND_PRESSED;
  94   else if(layout_manager->shelf_widget()->GetDimsShelf())
  95     background_image_id = IDR_AURA_NOTIFICATION_BACKGROUND_ON_BLACK;
  96   else
  97     background_image_id = IDR_AURA_NOTIFICATION_BACKGROUND_NORMAL;
  98
  99   const gfx::ImageSkia* background =
 100       rb.GetImageNamed(background_image_id).ToImageSkia();
 101   if (alignment == SHELF_ALIGNMENT_LEFT) {
 102     bounds = gfx::Rect(
 103         bounds.right() - background->width() -
 104             ShelfLayoutManager::kShelfItemInset,
 105         bounds.y() + (bounds.height() - background->height()) / 2,
 106         background->width(), background->height());
 107   } else if (alignment == SHELF_ALIGNMENT_RIGHT) {
 108     bounds = gfx::Rect(
 109         bounds.x() + ShelfLayoutManager::kShelfItemInset,
 110         bounds.y() + (bounds.height() - background->height()) / 2,
 111         background->width(), background->height());
 112   } else {
 113     bounds = gfx::Rect(
 114         bounds.x() + (bounds.width() - background->width()) / 2,
 115         bounds.y() + ShelfLayoutManager::kShelfItemInset,
 116         background->width(), background->height());
 117   }
 118   canvas->DrawImageInt(*background, bounds.x(), bounds.y());
 119
 120   if (height() < kButtonHoverSize)
 121     return;
 122
 123   const gfx::ImageSkia* image = NULL;
 124
 125   switch(alignment) {
 126     case SHELF_ALIGNMENT_LEFT:
 127       if (left_image_.isNull()) {
 128         left_image_ = gfx::ImageSkiaOperations::CreateRotatedImage(
 129             *bottom_image_, SkBitmapOperations::ROTATION_90_CW);
 130       }
 131       image = &left_image_;
 132       break;
 133     case SHELF_ALIGNMENT_RIGHT:
 134       if (right_image_.isNull()) {
 135         right_image_ = gfx::ImageSkiaOperations::CreateRotatedImage(
 136             *bottom_image_, SkBitmapOperations::ROTATION_270_CW);
 137       }
 138       image = &right_image_;
 139       break;
 140     default:
 141       image = bottom_image_;
 142       break;
 143   }
 144
 145   canvas->DrawImageInt(*image,
 146                        bounds.x() + ((bounds.width() - image->width()) / 2),
 147                        bounds.y() + ((bounds.height() - image->height()) / 2));
 148 }
 149
 150 }  // namespace ash