src/chrome/browser/ui/views/dropdown_bar_view.cc

   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 "chrome/browser/ui/views/dropdown_bar_view.h"
   6
   7 #include "chrome/browser/themes/theme_service.h"
   8 #include "chrome/browser/ui/view_ids.h"
   9 #include "chrome/browser/ui/views/frame/browser_view.h"
  10 #include "grit/theme_resources.h"
  11 #include "third_party/skia/include/core/SkCanvas.h"
  12 #include "third_party/skia/include/core/SkRect.h"
  13 #include "ui/base/resource/resource_bundle.h"
  14 #include "ui/gfx/canvas.h"
  15 #include "ui/gfx/image/image_skia.h"
  16 #include "ui/views/background.h"
  17 #include "ui/views/border.h"
  18 #include "ui/views/painter.h"
  19 #include "ui/views/widget/widget.h"
  20
  21 namespace {
  22
  23 // When we are animating, we draw only the top part of the left and right
  24 // edges to give the illusion that the find dialog is attached to the
  25 // window during this animation; this is the height of the items we draw.
  26 const int kAnimatingEdgeHeight = 5;
  27
  28 // Background to paint toolbar background with rounded corners.
  29 class DropdownBackground : public views::Background {
  30  public:
  31   explicit DropdownBackground(BrowserView* browser,
  32                               const gfx::ImageSkia* left_alpha_mask,
  33                               const gfx::ImageSkia* right_alpha_mask);
  34   ~DropdownBackground() override {}
  35
  36   // Overridden from views::Background.
  37   void Paint(gfx::Canvas* canvas, views::View* view) const override;
  38
  39  private:
  40   BrowserView* browser_view_;
  41   const gfx::ImageSkia* left_alpha_mask_;
  42   const gfx::ImageSkia* right_alpha_mask_;
  43
  44   DISALLOW_COPY_AND_ASSIGN(DropdownBackground);
  45 };
  46
  47 DropdownBackground::DropdownBackground(BrowserView* browser_view,
  48                                      const gfx::ImageSkia* left_alpha_mask,
  49                                      const gfx::ImageSkia* right_alpha_mask)
  50     : browser_view_(browser_view),
  51       left_alpha_mask_(left_alpha_mask),
  52       right_alpha_mask_(right_alpha_mask) {
  53 }
  54
  55 void DropdownBackground::Paint(gfx::Canvas* canvas, views::View* view) const {
  56   // Find the offset from which to tile the toolbar background image.
  57   // First, get the origin with respect to the screen.
  58   gfx::Point origin = view->GetWidget()->GetWindowBoundsInScreen().origin();
  59   // Now convert from screen to parent coordinates.
  60   views::View::ConvertPointFromScreen(browser_view_, &origin);
  61   // Finally, calculate the background image tiling offset.
  62   origin = browser_view_->OffsetPointForToolbarBackgroundImage(origin);
  63
  64   ui::ThemeProvider* tp = view->GetThemeProvider();
  65   gfx::ImageSkia background = *tp->GetImageSkiaNamed(IDR_THEME_TOOLBAR);
  66
  67   int left_edge_width = left_alpha_mask_->width();
  68   int right_edge_width = right_alpha_mask_->width();
  69   int mask_height = left_alpha_mask_->height();
  70   int height = view->bounds().height();
  71
  72   // Stretch the middle background to cover the entire area.
  73   canvas->TileImageInt(background, origin.x(), origin.y(),
  74       0, 0, view->bounds().width(), height);
  75
  76   SkPaint paint;
  77   paint.setXfermodeMode(SkXfermode::kDstIn_Mode);
  78   // Draw left edge.
  79   canvas->DrawImageInt(*left_alpha_mask_, 0, 0, left_edge_width, mask_height,
  80       0, 0, left_edge_width, height, false, paint);
  81
  82   // Draw right edge.
  83   int x_right_edge = view->bounds().width() - right_edge_width;
  84   canvas->DrawImageInt(*right_alpha_mask_, 0, 0, right_edge_width,
  85       mask_height, x_right_edge, 0, right_edge_width, height, false, paint);
  86 }
  87
  88 }  // namespace
  89
  90 DropdownBarView::DropdownBarView(DropdownBarHost* host)
  91     : host_(host),
  92       animation_offset_(0) {
  93 }
  94
  95 DropdownBarView::~DropdownBarView() {
  96 }
  97
  98 ////////////////////////////////////////////////////////////////////////////////
  99 // DropDownBarView, public:
 100
 101 void DropdownBarView::SetAnimationOffset(int offset) {
 102   animation_offset_ = offset;
 103   set_clip_insets(gfx::Insets(animation_offset_, 0, 0, 0));
 104 }
 105
 106 // DropDownBarView, views::View overrides:
 107 void DropdownBarView::OnPaint(gfx::Canvas* canvas) {
 108   OnPaintBackground(canvas);
 109   OnPaintBorder(canvas);
 110
 111   if (animation_offset() > 0) {
 112      gfx::Canvas animating_edges(
 113          gfx::Size(bounds().width(), kAnimatingEdgeHeight),
 114          canvas->image_scale(),
 115          false);
 116      canvas->Translate(bounds().OffsetFromOrigin());
 117      OnPaintBackground(&animating_edges);
 118      OnPaintBorder(&animating_edges);
 119      canvas->DrawImageInt(gfx::ImageSkia(animating_edges.ExtractImageRep()),
 120          bounds().x(), animation_offset());
 121   }
 122 }
 123
 124 ////////////////////////////////////////////////////////////////////////////////
 125 // DropDownBarView, protected:
 126
 127 void DropdownBarView::SetBackground(const gfx::ImageSkia* left_alpha_mask,
 128                                     const gfx::ImageSkia* right_alpha_mask) {
 129   set_background(new DropdownBackground(host()->browser_view(), left_alpha_mask,
 130       right_alpha_mask));
 131 }
 132
 133 void DropdownBarView::SetBorderFromIds(int left_border_image_id,
 134                                        int middle_border_image_id,
 135                                        int right_border_image_id) {
 136   int border_image_ids[3] = {left_border_image_id, middle_border_image_id,
 137       right_border_image_id};
 138   SetBorder(views::Border::CreateBorderPainter(
 139       new views::HorizontalPainter(border_image_ids), gfx::Insets()));
 140 }