src/chrome/browser/ui/views/tabs/dragged_tab_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/tabs/dragged_tab_view.h"
   6
   7 #include "base/stl_util.h"
   8 #include "chrome/browser/ui/views/tabs/native_view_photobooth.h"
   9 #include "third_party/skia/include/core/SkShader.h"
  10 #include "ui/gfx/canvas.h"
  11 #include "ui/views/widget/widget.h"
  12
  13 #if defined(USE_AURA)
  14 #include "ui/views/widget/native_widget_aura.h"
  15 #elif defined(OS_WIN)
  16 #include "ui/gfx/win/dpi.h"
  17 #include "ui/views/widget/native_widget_win.h"
  18 #endif
  19
  20 static const int kTransparentAlpha = 200;
  21 static const int kDragFrameBorderSize = 2;
  22 static const int kTwiceDragFrameBorderSize = 2 * kDragFrameBorderSize;
  23 static const float kScalingFactor = 0.5;
  24 static const SkColor kDraggedTabBorderColor = SkColorSetRGB(103, 129, 162);
  25
  26 ////////////////////////////////////////////////////////////////////////////////
  27 // DraggedTabView, public:
  28
  29 DraggedTabView::DraggedTabView(const std::vector<views::View*>& renderers,
  30                                const std::vector<gfx::Rect>& renderer_bounds,
  31                                const gfx::Point& mouse_tab_offset,
  32                                const gfx::Size& contents_size,
  33                                NativeViewPhotobooth* photobooth)
  34     : renderers_(renderers),
  35       renderer_bounds_(renderer_bounds),
  36       show_contents_on_drag_(true),
  37       mouse_tab_offset_(mouse_tab_offset),
  38       photobooth_(photobooth),
  39       contents_size_(contents_size) {
  40   set_owned_by_client();
  41
  42   container_.reset(new views::Widget);
  43   views::Widget::InitParams params(views::Widget::InitParams::TYPE_POPUP);
  44   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
  45   params.keep_on_top = true;
  46   params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
  47   params.bounds = gfx::Rect(PreferredContainerSize());
  48   container_->Init(params);
  49   container_->SetContentsView(this);
  50 #if defined(OS_WIN) && !defined(USE_AURA)
  51   static_cast<views::NativeWidgetWin*>(container_->native_widget())->
  52       SetCanUpdateLayeredWindow(false);
  53
  54   BOOL drag;
  55   if ((::SystemParametersInfo(SPI_GETDRAGFULLWINDOWS, 0, &drag, 0) != 0) &&
  56       (drag == FALSE)) {
  57     show_contents_on_drag_ = false;
  58   }
  59 #endif
  60   container_->SetOpacity(kTransparentAlpha);
  61   container_->SetBounds(gfx::Rect(params.bounds.size()));
  62 }
  63
  64 DraggedTabView::~DraggedTabView() {
  65   parent()->RemoveChildView(this);
  66   container_->CloseNow();
  67   STLDeleteElements(&renderers_);
  68 }
  69
  70 void DraggedTabView::MoveTo(const gfx::Point& screen_point) {
  71   int x;
  72   if (base::i18n::IsRTL()) {
  73     // On RTL locales, a dragged tab (when it is not attached to a tab strip)
  74     // is rendered using a right-to-left orientation so we should calculate the
  75     // window position differently.
  76     gfx::Size ps = GetPreferredSize();
  77     x = screen_point.x() + ScaleValue(mouse_tab_offset_.x() - ps.width());
  78   } else {
  79     x = screen_point.x() - ScaleValue(mouse_tab_offset_.x());
  80   }
  81   int y = screen_point.y() - ScaleValue(mouse_tab_offset_.y());
  82
  83   gfx::Rect bounds = container_->GetWindowBoundsInScreen();
  84   container_->SetBounds(gfx::Rect(x, y, bounds.width(), bounds.height()));
  85   if (!container_->IsVisible())
  86     container_->Show();
  87 }
  88
  89 void DraggedTabView::Update() {
  90   SchedulePaint();
  91 }
  92
  93 ///////////////////////////////////////////////////////////////////////////////
  94 // DraggedTabView, views::View overrides:
  95
  96 void DraggedTabView::OnPaint(gfx::Canvas* canvas) {
  97   if (show_contents_on_drag_)
  98     PaintDetachedView(canvas);
  99   else
 100     PaintFocusRect(canvas);
 101 }
 102
 103 void DraggedTabView::Layout() {
 104   int max_width = GetPreferredSize().width();
 105   for (size_t i = 0; i < renderers_.size(); ++i) {
 106     gfx::Rect bounds = renderer_bounds_[i];
 107     bounds.set_y(0);
 108     if (base::i18n::IsRTL())
 109       bounds.set_x(max_width - bounds.x() - bounds.width());
 110     renderers_[i]->SetBoundsRect(bounds);
 111   }
 112 }
 113
 114 gfx::Size DraggedTabView::GetPreferredSize() {
 115   DCHECK(!renderer_bounds_.empty());
 116   int max_renderer_x = renderer_bounds_.back().right();
 117   int width = std::max(max_renderer_x, contents_size_.width()) +
 118       kTwiceDragFrameBorderSize;
 119   int height = renderer_bounds_.back().height() + kDragFrameBorderSize +
 120       contents_size_.height();
 121   return gfx::Size(width, height);
 122 }
 123
 124 ////////////////////////////////////////////////////////////////////////////////
 125 // DraggedTabView, private:
 126
 127 void DraggedTabView::PaintDetachedView(gfx::Canvas* canvas) {
 128   gfx::Size ps = GetPreferredSize();
 129   // TODO(pkotwicz): DIP enable this class.
 130   gfx::Canvas scale_canvas(ps, 1.0f, false);
 131   SkBitmap& bitmap_device = const_cast<SkBitmap&>(
 132       skia::GetTopDevice(*scale_canvas.sk_canvas())->accessBitmap(true));
 133   bitmap_device.eraseARGB(0, 0, 0, 0);
 134
 135   int tab_height = renderer_bounds_.back().height();
 136   scale_canvas.FillRect(gfx::Rect(0, tab_height - kDragFrameBorderSize,
 137                                   ps.width(), ps.height() - tab_height),
 138                         kDraggedTabBorderColor);
 139   gfx::Rect image_rect(kDragFrameBorderSize,
 140                        tab_height,
 141                        ps.width() - kTwiceDragFrameBorderSize,
 142                        contents_size_.height());
 143   scale_canvas.FillRect(image_rect, SK_ColorBLACK);
 144   photobooth_->PaintScreenshotIntoCanvas(&scale_canvas, image_rect);
 145   for (size_t i = 0; i < renderers_.size(); ++i)
 146     renderers_[i]->Paint(&scale_canvas);
 147
 148   SkBitmap mipmap = scale_canvas.ExtractImageRep().sk_bitmap();
 149   mipmap.buildMipMap(true);
 150
 151   skia::RefPtr<SkShader> bitmap_shader = skia::AdoptRef(
 152       SkShader::CreateBitmapShader(mipmap, SkShader::kClamp_TileMode,
 153                                    SkShader::kClamp_TileMode));
 154
 155   SkMatrix shader_scale;
 156   shader_scale.setScale(kScalingFactor, kScalingFactor);
 157   bitmap_shader->setLocalMatrix(shader_scale);
 158
 159   SkPaint paint;
 160   paint.setShader(bitmap_shader.get());
 161   paint.setAntiAlias(true);
 162
 163   canvas->DrawRect(gfx::Rect(ps), paint);
 164 }
 165
 166 void DraggedTabView::PaintFocusRect(gfx::Canvas* canvas) {
 167   gfx::Size ps = GetPreferredSize();
 168   canvas->DrawFocusRect(
 169       gfx::Rect(0, 0,
 170                 static_cast<int>(ps.width() * kScalingFactor),
 171                 static_cast<int>(ps.height() * kScalingFactor)));
 172 }
 173
 174 gfx::Size DraggedTabView::PreferredContainerSize() {
 175   gfx::Size ps = GetPreferredSize();
 176   return gfx::Size(ScaleValue(ps.width()), ScaleValue(ps.height()));
 177 }
 178
 179 int DraggedTabView::ScaleValue(int value) {
 180   return static_cast<int>(value * kScalingFactor);
 181 }