src/ui/aura/window_tree_host.cc

   1 // Copyright (c) 2013 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 "ui/aura/window_tree_host.h"
   6
   7 #include "ui/aura/client/cursor_client.h"
   8 #include "ui/aura/env.h"
   9 #include "ui/aura/root_window.h"
  10 #include "ui/aura/root_window_transformer.h"
  11 #include "ui/aura/window.h"
  12 #include "ui/aura/window_tree_host_delegate.h"
  13 #include "ui/compositor/dip_util.h"
  14 #include "ui/compositor/layer.h"
  15 #include "ui/gfx/display.h"
  16 #include "ui/gfx/insets.h"
  17 #include "ui/gfx/point.h"
  18 #include "ui/gfx/point3_f.h"
  19 #include "ui/gfx/point_conversions.h"
  20 #include "ui/gfx/screen.h"
  21 #include "ui/gfx/size_conversions.h"
  22
  23 namespace aura {
  24
  25 float GetDeviceScaleFactorFromDisplay(Window* window) {
  26   gfx::Display display = gfx::Screen::GetScreenFor(window)->
  27       GetDisplayNearestWindow(window);
  28   DCHECK(display.is_valid());
  29   return display.device_scale_factor();
  30 }
  31
  32 class SimpleRootWindowTransformer : public RootWindowTransformer {
  33  public:
  34   SimpleRootWindowTransformer(const Window* root_window,
  35                               const gfx::Transform& transform)
  36       : root_window_(root_window),
  37         transform_(transform) {
  38   }
  39
  40   // RootWindowTransformer overrides:
  41   virtual gfx::Transform GetTransform() const OVERRIDE {
  42     return transform_;
  43   }
  44
  45   virtual gfx::Transform GetInverseTransform() const OVERRIDE {
  46     gfx::Transform invert;
  47     if (!transform_.GetInverse(&invert))
  48       return transform_;
  49     return invert;
  50   }
  51
  52   virtual gfx::Rect GetRootWindowBounds(
  53       const gfx::Size& host_size) const OVERRIDE {
  54     gfx::Rect bounds(host_size);
  55     gfx::RectF new_bounds(ui::ConvertRectToDIP(root_window_->layer(), bounds));
  56     transform_.TransformRect(&new_bounds);
  57     return gfx::Rect(gfx::ToFlooredSize(new_bounds.size()));
  58   }
  59
  60   virtual gfx::Insets GetHostInsets() const OVERRIDE {
  61     return gfx::Insets();
  62   }
  63
  64  private:
  65   virtual ~SimpleRootWindowTransformer() {}
  66
  67   const Window* root_window_;
  68   const gfx::Transform transform_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(SimpleRootWindowTransformer);
  71 };
  72
  73 ////////////////////////////////////////////////////////////////////////////////
  74 // WindowTreeHost, public:
  75
  76 WindowTreeHost::~WindowTreeHost() {
  77   DCHECK(!compositor_) << "compositor must be destroyed before root window";
  78 }
  79
  80 void WindowTreeHost::InitHost() {
  81   window()->Init(aura::WINDOW_LAYER_NOT_DRAWN);
  82   InitCompositor();
  83   UpdateRootWindowSize(GetBounds().size());
  84   Env::GetInstance()->NotifyRootWindowInitialized(delegate_->AsRootWindow());
  85   window()->Show();
  86 }
  87
  88 void WindowTreeHost::InitCompositor() {
  89   compositor_->SetScaleAndSize(GetDeviceScaleFactorFromDisplay(window()),
  90                                GetBounds().size());
  91   compositor_->SetRootLayer(window()->layer());
  92   transformer_.reset(
  93       new SimpleRootWindowTransformer(window(), gfx::Transform()));
  94 }
  95
  96 aura::Window* WindowTreeHost::window() {
  97   return const_cast<Window*>(const_cast<const WindowTreeHost*>(this)->window());
  98 }
  99
 100 const aura::Window* WindowTreeHost::window() const {
 101   return delegate_->AsRootWindow()->window();
 102 }
 103
 104 void WindowTreeHost::SetRootWindowTransformer(
 105     scoped_ptr<RootWindowTransformer> transformer) {
 106   transformer_ = transformer.Pass();
 107   SetInsets(transformer_->GetHostInsets());
 108   window()->SetTransform(transformer_->GetTransform());
 109   // If the layer is not animating, then we need to update the root window
 110   // size immediately.
 111   if (!window()->layer()->GetAnimator()->is_animating())
 112     UpdateRootWindowSize(GetBounds().size());
 113 }
 114
 115 gfx::Transform WindowTreeHost::GetRootTransform() const {
 116   float scale = ui::GetDeviceScaleFactor(window()->layer());
 117   gfx::Transform transform;
 118   transform.Scale(scale, scale);
 119   transform *= transformer_->GetTransform();
 120   return transform;
 121 }
 122
 123 void WindowTreeHost::SetTransform(const gfx::Transform& transform) {
 124   scoped_ptr<RootWindowTransformer> transformer(
 125       new SimpleRootWindowTransformer(window(), transform));
 126   SetRootWindowTransformer(transformer.Pass());
 127 }
 128
 129 gfx::Transform WindowTreeHost::GetInverseRootTransform() const {
 130   float scale = ui::GetDeviceScaleFactor(window()->layer());
 131   gfx::Transform transform;
 132   transform.Scale(1.0f / scale, 1.0f / scale);
 133   return transformer_->GetInverseTransform() * transform;
 134 }
 135
 136 void WindowTreeHost::UpdateRootWindowSize(const gfx::Size& host_size) {
 137   window()->SetBounds(transformer_->GetRootWindowBounds(host_size));
 138 }
 139
 140 void WindowTreeHost::ConvertPointToNativeScreen(gfx::Point* point) const {
 141   ConvertPointToHost(point);
 142   gfx::Point location = GetLocationOnNativeScreen();
 143   point->Offset(location.x(), location.y());
 144 }
 145
 146 void WindowTreeHost::ConvertPointFromNativeScreen(gfx::Point* point) const {
 147   gfx::Point location = GetLocationOnNativeScreen();
 148   point->Offset(-location.x(), -location.y());
 149   ConvertPointFromHost(point);
 150 }
 151
 152 void WindowTreeHost::ConvertPointToHost(gfx::Point* point) const {
 153   gfx::Point3F point_3f(*point);
 154   GetRootTransform().TransformPoint(&point_3f);
 155   *point = gfx::ToFlooredPoint(point_3f.AsPointF());
 156 }
 157
 158 void WindowTreeHost::ConvertPointFromHost(gfx::Point* point) const {
 159   gfx::Point3F point_3f(*point);
 160   GetInverseRootTransform().TransformPoint(&point_3f);
 161   *point = gfx::ToFlooredPoint(point_3f.AsPointF());
 162 }
 163
 164 void WindowTreeHost::SetCursor(gfx::NativeCursor cursor) {
 165   last_cursor_ = cursor;
 166   // A lot of code seems to depend on NULL cursors actually showing an arrow,
 167   // so just pass everything along to the host.
 168   SetCursorNative(cursor);
 169 }
 170
 171 void WindowTreeHost::OnCursorVisibilityChanged(bool show) {
 172   // Clear any existing mouse hover effects when the cursor becomes invisible.
 173   // Note we do not need to dispatch a mouse enter when the cursor becomes
 174   // visible because that can only happen in response to a mouse event, which
 175   // will trigger its own mouse enter.
 176   if (!show) {
 177     delegate_->AsRootWindow()->DispatchMouseExitAtPoint(
 178         delegate_->AsRootWindow()->GetLastMouseLocationInRoot());
 179   }
 180
 181   OnCursorVisibilityChangedNative(show);
 182 }
 183
 184 void WindowTreeHost::MoveCursorTo(const gfx::Point& location_in_dip) {
 185   gfx::Point host_location(location_in_dip);
 186   ConvertPointToHost(&host_location);
 187   MoveCursorToInternal(location_in_dip, host_location);
 188 }
 189
 190 void WindowTreeHost::MoveCursorToHostLocation(const gfx::Point& host_location) {
 191   gfx::Point root_location(host_location);
 192   ConvertPointFromHost(&root_location);
 193   MoveCursorToInternal(root_location, host_location);
 194 }
 195
 196 ////////////////////////////////////////////////////////////////////////////////
 197 // WindowTreeHost, protected:
 198
 199 WindowTreeHost::WindowTreeHost()
 200     : delegate_(NULL),
 201       last_cursor_(ui::kCursorNull) {
 202 }
 203
 204 void WindowTreeHost::DestroyCompositor() {
 205   DCHECK(GetAcceleratedWidget());
 206   compositor_.reset();
 207 }
 208
 209 void WindowTreeHost::CreateCompositor(
 210     gfx::AcceleratedWidget accelerated_widget) {
 211   compositor_.reset(new ui::Compositor(GetAcceleratedWidget()));
 212   DCHECK(compositor_.get());
 213 }
 214
 215 void WindowTreeHost::NotifyHostResized(const gfx::Size& new_size) {
 216   // The compositor should have the same size as the native root window host.
 217   // Get the latest scale from display because it might have been changed.
 218   compositor_->SetScaleAndSize(GetDeviceScaleFactorFromDisplay(window()),
 219                                new_size);
 220
 221   gfx::Size layer_size = GetBounds().size();
 222   // The layer, and the observers should be notified of the
 223   // transformed size of the root window.
 224   UpdateRootWindowSize(layer_size);
 225   delegate_->OnHostResized(layer_size);
 226 }
 227
 228 void WindowTreeHost::MoveCursorToInternal(const gfx::Point& root_location,
 229                                           const gfx::Point& host_location) {
 230   MoveCursorToNative(host_location);
 231   client::CursorClient* cursor_client = client::GetCursorClient(window());
 232   if (cursor_client) {
 233     const gfx::Display& display =
 234         gfx::Screen::GetScreenFor(window())->GetDisplayNearestWindow(window());
 235     cursor_client->SetDisplay(display);
 236   }
 237   delegate_->OnCursorMovedToRootLocation(root_location);
 238 }
 239
 240 #if defined(OS_ANDROID)
 241 // static
 242 WindowTreeHost* WindowTreeHost::Create(const gfx::Rect& bounds) {
 243   // This is only hit for tests and ash, right now these aren't an issue so
 244   // adding the CHECK.
 245   // TODO(sky): decide if we want a factory.
 246   CHECK(false);
 247   return NULL;
 248 }
 249 #endif
 250
 251 }  // namespace aura