dropdown_bar_view.cc revision a3f6a49ab37290eeeb8db0f41ec0f1cb74a68be7 
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
22namespace {
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.
27const int kAnimatingEdgeHeight = 5;
28
29// Background to paint toolbar background with rounded corners.
30class 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
48DropdownBackground::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
56void 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::ConvertPointFromScreen(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
91DropdownBarView::DropdownBarView(DropdownBarHost* host)
92    : host_(host),
93      animation_offset_(0) {
94}
95
96DropdownBarView::~DropdownBarView() {
97}
98
99////////////////////////////////////////////////////////////////////////////////
100// DropDownBarView, public:
101
102void 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:
108void 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
128void 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
134void 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}
142