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      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   virtual ~DropdownBackground() {}
     35 
     36   // Overridden from views::Background.
     37   virtual 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 }
    141