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/generated_resources.h"
  11 #include "grit/theme_resources.h"
  12 #include "third_party/skia/include/core/SkCanvas.h"
  13 #include "third_party/skia/include/core/SkRect.h"
  14 #include "ui/base/resource/resource_bundle.h"
  15 #include "ui/gfx/canvas.h"
  16 #include "ui/gfx/image/image_skia.h"
  17 #include "ui/views/background.h"
  18 #include "ui/views/border.h"
  19 #include "ui/views/painter.h"
  20 #include "ui/views/widget/widget.h"
  21
  22 namespace {
  23
  24 // When we are animating, we draw only the top part of the left and right
  25 // edges to give the illusion that the find dialog is attached to the
  26 // window during this animation; this is the height of the items we draw.
  27 const int kAnimatingEdgeHeight = 5;
  28
  29 // Background to paint toolbar background with rounded corners.
  30 class DropdownBackground : public views::Background {
  31  public:
  32   explicit DropdownBackground(BrowserView* browser,
  33                               const gfx::ImageSkia* left_alpha_mask,
  34                               const gfx::ImageSkia* right_alpha_mask);
  35   virtual ~DropdownBackground() {}
  36
  37   // Overridden from views::Background.
  38   virtual void Paint(gfx::Canvas* canvas, views::View* view) const OVERRIDE;
  39
  40  private:
  41   BrowserView* browser_view_;
  42   const gfx::ImageSkia* left_alpha_mask_;
  43   const gfx::ImageSkia* right_alpha_mask_;
  44
  45   DISALLOW_COPY_AND_ASSIGN(DropdownBackground);
  46 };
  47
  48 DropdownBackground::DropdownBackground(BrowserView* browser_view,
  49                                      const gfx::ImageSkia* left_alpha_mask,
  50                                      const gfx::ImageSkia* right_alpha_mask)
  51     : browser_view_(browser_view),
  52       left_alpha_mask_(left_alpha_mask),
  53       right_alpha_mask_(right_alpha_mask) {
  54 }
  55
  56 void DropdownBackground::Paint(gfx::Canvas* canvas, views::View* view) const {
  57   // Find the offset from which to tile the toolbar background image.
  58   // First, get the origin with respect to the screen.
  59   gfx::Point origin = view->GetWidget()->GetWindowBoundsInScreen().origin();
  60   // Now convert from screen to parent coordinates.
  61   views::View::ConvertPointToTarget(NULL, browser_view_, &origin);
  62   // Finally, calculate the background image tiling offset.
  63   origin = browser_view_->OffsetPointForToolbarBackgroundImage(origin);
  64
  65   ui::ThemeProvider* tp = view->GetThemeProvider();
  66   gfx::ImageSkia background = *tp->GetImageSkiaNamed(IDR_THEME_TOOLBAR);
  67
  68   int left_edge_width = left_alpha_mask_->width();
  69   int right_edge_width = right_alpha_mask_->width();
  70   int mask_height = left_alpha_mask_->height();
  71   int height = view->bounds().height();
  72
  73   // Stretch the middle background to cover the entire area.
  74   canvas->TileImageInt(background, origin.x(), origin.y(),
  75       0, 0, view->bounds().width(), height);
  76
  77   SkPaint paint;
  78   paint.setXfermodeMode(SkXfermode::kDstIn_Mode);
  79   // Draw left edge.
  80   canvas->DrawImageInt(*left_alpha_mask_, 0, 0, left_edge_width, mask_height,
  81       0, 0, left_edge_width, height, false, paint);
  82
  83   // Draw right edge.
  84   int x_right_edge = view->bounds().width() - right_edge_width;
  85   canvas->DrawImageInt(*right_alpha_mask_, 0, 0, right_edge_width,
  86       mask_height, x_right_edge, 0, right_edge_width, height, false, paint);
  87 }
  88
  89 }  // namespace
  90
  91 DropdownBarView::DropdownBarView(DropdownBarHost* host)
  92     : host_(host),
  93       animation_offset_(0) {
  94 }
  95
  96 DropdownBarView::~DropdownBarView() {
  97 }
  98
  99 ////////////////////////////////////////////////////////////////////////////////
 100 // DropDownBarView, public:
 101
 102 void DropdownBarView::SetAnimationOffset(int offset) {
 103   animation_offset_ = offset;
 104   set_clip_insets(gfx::Insets(animation_offset_, 0, 0, 0));
 105 }
 106
 107 // DropDownBarView, views::View overrides:
 108 void DropdownBarView::OnPaint(gfx::Canvas* canvas) {
 109   OnPaintBackground(canvas);
 110   OnPaintBorder(canvas);
 111
 112   if (animation_offset() > 0) {
 113      gfx::Canvas animating_edges(
 114          gfx::Size(bounds().width(), kAnimatingEdgeHeight),
 115          canvas->image_scale(),
 116          false);
 117      canvas->Translate(bounds().OffsetFromOrigin());
 118      OnPaintBackground(&animating_edges);
 119      OnPaintBorder(&animating_edges);
 120      canvas->DrawImageInt(gfx::ImageSkia(animating_edges.ExtractImageRep()),
 121          bounds().x(), animation_offset());
 122   }
 123 }
 124
 125 ////////////////////////////////////////////////////////////////////////////////
 126 // DropDownBarView, protected:
 127
 128 void DropdownBarView::SetBackground(const gfx::ImageSkia* left_alpha_mask,
 129                                     const gfx::ImageSkia* right_alpha_mask) {
 130   set_background(new DropdownBackground(host()->browser_view(), left_alpha_mask,
 131       right_alpha_mask));
 132 }
 133
 134 void DropdownBarView::SetBorder(int left_border_image_id,
 135                                 int middle_border_image_id,
 136                                 int right_border_image_id) {
 137   int border_image_ids[3] = {left_border_image_id, middle_border_image_id,
 138       right_border_image_id};
 139   set_border(views::Border::CreateBorderPainter(
 140       new views::HorizontalPainter(border_image_ids), gfx::Insets()));
 141 }