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 "base/debug/trace_event.h"
   8 #include "base/message_loop/message_loop.h"
   9 #include "ui/aura/client/capture_client.h"
  10 #include "ui/aura/client/cursor_client.h"
  11 #include "ui/aura/env.h"
  12 #include "ui/aura/window.h"
  13 #include "ui/aura/window_event_dispatcher.h"
  14 #include "ui/aura/window_targeter.h"
  15 #include "ui/aura/window_tree_host_observer.h"
  16 #include "ui/base/view_prop.h"
  17 #include "ui/compositor/dip_util.h"
  18 #include "ui/compositor/layer.h"
  19 #include "ui/gfx/display.h"
  20 #include "ui/gfx/insets.h"
  21 #include "ui/gfx/point.h"
  22 #include "ui/gfx/point3_f.h"
  23 #include "ui/gfx/point_conversions.h"
  24 #include "ui/gfx/screen.h"
  25 #include "ui/gfx/size_conversions.h"
  26
  27 namespace aura {
  28
  29 const char kWindowTreeHostForAcceleratedWidget[] =
  30     "__AURA_WINDOW_TREE_HOST_ACCELERATED_WIDGET__";
  31
  32 float GetDeviceScaleFactorFromDisplay(Window* window) {
  33   gfx::Display display = gfx::Screen::GetScreenFor(window)->
  34       GetDisplayNearestWindow(window);
  35   DCHECK(display.is_valid());
  36   return display.device_scale_factor();
  37 }
  38
  39 ////////////////////////////////////////////////////////////////////////////////
  40 // WindowTreeHost, public:
  41
  42 WindowTreeHost::~WindowTreeHost() {
  43   DCHECK(!compositor_) << "compositor must be destroyed before root window";
  44 }
  45
  46 #if defined(OS_ANDROID)
  47 // static
  48 WindowTreeHost* WindowTreeHost::Create(const gfx::Rect& bounds) {
  49   // This is only hit for tests and ash, right now these aren't an issue so
  50   // adding the CHECK.
  51   // TODO(sky): decide if we want a factory.
  52   CHECK(false);
  53   return NULL;
  54 }
  55 #endif
  56
  57 // static
  58 WindowTreeHost* WindowTreeHost::GetForAcceleratedWidget(
  59     gfx::AcceleratedWidget widget) {
  60   return reinterpret_cast<WindowTreeHost*>(
  61       ui::ViewProp::GetValue(widget, kWindowTreeHostForAcceleratedWidget));
  62 }
  63
  64 void WindowTreeHost::InitHost() {
  65   InitCompositor();
  66   UpdateRootWindowSize(GetBounds().size());
  67   Env::GetInstance()->NotifyHostInitialized(this);
  68   window()->Show();
  69 }
  70
  71 void WindowTreeHost::InitCompositor() {
  72   compositor_->SetScaleAndSize(GetDeviceScaleFactorFromDisplay(window()),
  73                                GetBounds().size());
  74   compositor_->SetRootLayer(window()->layer());
  75 }
  76
  77 void WindowTreeHost::AddObserver(WindowTreeHostObserver* observer) {
  78   observers_.AddObserver(observer);
  79 }
  80
  81 void WindowTreeHost::RemoveObserver(WindowTreeHostObserver* observer) {
  82   observers_.RemoveObserver(observer);
  83 }
  84
  85 ui::EventProcessor* WindowTreeHost::event_processor() {
  86   return dispatcher();
  87 }
  88
  89 gfx::Transform WindowTreeHost::GetRootTransform() const {
  90   float scale = ui::GetDeviceScaleFactor(window()->layer());
  91   gfx::Transform transform;
  92   transform.Scale(scale, scale);
  93   transform *= window()->layer()->transform();
  94   return transform;
  95 }
  96
  97 void WindowTreeHost::SetRootTransform(const gfx::Transform& transform) {
  98   window()->SetTransform(transform);
  99   UpdateRootWindowSize(GetBounds().size());
 100 }
 101
 102 gfx::Transform WindowTreeHost::GetInverseRootTransform() const {
 103   gfx::Transform invert;
 104   gfx::Transform transform = GetRootTransform();
 105   if (!transform.GetInverse(&invert))
 106     return transform;
 107   return invert;
 108 }
 109
 110 void WindowTreeHost::UpdateRootWindowSize(const gfx::Size& host_size) {
 111   gfx::Rect bounds(host_size);
 112   gfx::RectF new_bounds(ui::ConvertRectToDIP(window()->layer(), bounds));
 113   window()->layer()->transform().TransformRect(&new_bounds);
 114   window()->SetBounds(gfx::Rect(gfx::ToFlooredSize(new_bounds.size())));
 115 }
 116
 117 void WindowTreeHost::ConvertPointToNativeScreen(gfx::Point* point) const {
 118   ConvertPointToHost(point);
 119   gfx::Point location = GetLocationOnNativeScreen();
 120   point->Offset(location.x(), location.y());
 121 }
 122
 123 void WindowTreeHost::ConvertPointFromNativeScreen(gfx::Point* point) const {
 124   gfx::Point location = GetLocationOnNativeScreen();
 125   point->Offset(-location.x(), -location.y());
 126   ConvertPointFromHost(point);
 127 }
 128
 129 void WindowTreeHost::ConvertPointToHost(gfx::Point* point) const {
 130   gfx::Point3F point_3f(*point);
 131   GetRootTransform().TransformPoint(&point_3f);
 132   *point = gfx::ToFlooredPoint(point_3f.AsPointF());
 133 }
 134
 135 void WindowTreeHost::ConvertPointFromHost(gfx::Point* point) const {
 136   gfx::Point3F point_3f(*point);
 137   GetInverseRootTransform().TransformPoint(&point_3f);
 138   *point = gfx::ToFlooredPoint(point_3f.AsPointF());
 139 }
 140
 141 void WindowTreeHost::SetCursor(gfx::NativeCursor cursor) {
 142   last_cursor_ = cursor;
 143   // A lot of code seems to depend on NULL cursors actually showing an arrow,
 144   // so just pass everything along to the host.
 145   SetCursorNative(cursor);
 146 }
 147
 148 void WindowTreeHost::OnCursorVisibilityChanged(bool show) {
 149   // Clear any existing mouse hover effects when the cursor becomes invisible.
 150   // Note we do not need to dispatch a mouse enter when the cursor becomes
 151   // visible because that can only happen in response to a mouse event, which
 152   // will trigger its own mouse enter.
 153   if (!show) {
 154     ui::EventDispatchDetails details = dispatcher()->DispatchMouseExitAtPoint(
 155         dispatcher()->GetLastMouseLocationInRoot());
 156     if (details.dispatcher_destroyed)
 157       return;
 158   }
 159
 160   OnCursorVisibilityChangedNative(show);
 161 }
 162
 163 void WindowTreeHost::MoveCursorTo(const gfx::Point& location_in_dip) {
 164   gfx::Point host_location(location_in_dip);
 165   ConvertPointToHost(&host_location);
 166   MoveCursorToInternal(location_in_dip, host_location);
 167 }
 168
 169 void WindowTreeHost::MoveCursorToHostLocation(const gfx::Point& host_location) {
 170   gfx::Point root_location(host_location);
 171   ConvertPointFromHost(&root_location);
 172   MoveCursorToInternal(root_location, host_location);
 173 }
 174
 175 ////////////////////////////////////////////////////////////////////////////////
 176 // WindowTreeHost, protected:
 177
 178 WindowTreeHost::WindowTreeHost()
 179     : window_(new Window(NULL)),
 180       last_cursor_(ui::kCursorNull) {
 181 }
 182
 183 void WindowTreeHost::DestroyCompositor() {
 184   compositor_.reset();
 185 }
 186
 187 void WindowTreeHost::DestroyDispatcher() {
 188   delete window_;
 189   window_ = NULL;
 190   dispatcher_.reset();
 191
 192   // TODO(beng): this comment is no longer quite valid since this function
 193   // isn't called from WED, and WED isn't a subclass of Window. So it seems
 194   // like we could just rely on ~Window now.
 195   // Destroy child windows while we're still valid. This is also done by
 196   // ~Window, but by that time any calls to virtual methods overriden here (such
 197   // as GetRootWindow()) result in Window's implementation. By destroying here
 198   // we ensure GetRootWindow() still returns this.
 199   //window()->RemoveOrDestroyChildren();
 200 }
 201
 202 void WindowTreeHost::CreateCompositor(
 203     gfx::AcceleratedWidget accelerated_widget) {
 204   DCHECK(Env::GetInstance());
 205   ui::ContextFactory* context_factory = Env::GetInstance()->context_factory();
 206   DCHECK(context_factory);
 207   compositor_.reset(
 208       new ui::Compositor(GetAcceleratedWidget(),
 209                          context_factory,
 210                          base::MessageLoopProxy::current()));
 211   // TODO(beng): I think this setup should probably all move to a "accelerated
 212   // widget available" function.
 213   if (!dispatcher()) {
 214     window()->Init(WINDOW_LAYER_NOT_DRAWN);
 215     window()->set_host(this);
 216     window()->SetName("RootWindow");
 217     window()->SetEventTargeter(
 218         scoped_ptr<ui::EventTargeter>(new WindowTargeter()));
 219     prop_.reset(new ui::ViewProp(GetAcceleratedWidget(),
 220                                  kWindowTreeHostForAcceleratedWidget,
 221                                  this));
 222     dispatcher_.reset(new WindowEventDispatcher(this));
 223   }
 224 }
 225
 226 void WindowTreeHost::OnHostMoved(const gfx::Point& new_location) {
 227   TRACE_EVENT1("ui", "WindowTreeHost::OnHostMoved",
 228                "origin", new_location.ToString());
 229
 230   FOR_EACH_OBSERVER(WindowTreeHostObserver, observers_,
 231                     OnHostMoved(this, new_location));
 232 }
 233
 234 void WindowTreeHost::OnHostResized(const gfx::Size& new_size) {
 235   // The compositor should have the same size as the native root window host.
 236   // Get the latest scale from display because it might have been changed.
 237   compositor_->SetScaleAndSize(GetDeviceScaleFactorFromDisplay(window()),
 238                                new_size);
 239
 240   gfx::Size layer_size = GetBounds().size();
 241   // The layer, and the observers should be notified of the
 242   // transformed size of the root window.
 243   UpdateRootWindowSize(layer_size);
 244   FOR_EACH_OBSERVER(WindowTreeHostObserver, observers_, OnHostResized(this));
 245 }
 246
 247 void WindowTreeHost::OnHostCloseRequested() {
 248   FOR_EACH_OBSERVER(WindowTreeHostObserver, observers_,
 249                     OnHostCloseRequested(this));
 250 }
 251
 252 void WindowTreeHost::OnHostActivated() {
 253   Env::GetInstance()->NotifyHostActivated(this);
 254 }
 255
 256 void WindowTreeHost::OnHostLostWindowCapture() {
 257   Window* capture_window = client::GetCaptureWindow(window());
 258   if (capture_window && capture_window->GetRootWindow() == window())
 259     capture_window->ReleaseCapture();
 260 }
 261
 262 ////////////////////////////////////////////////////////////////////////////////
 263 // WindowTreeHost, private:
 264
 265 void WindowTreeHost::MoveCursorToInternal(const gfx::Point& root_location,
 266                                           const gfx::Point& host_location) {
 267   last_cursor_request_position_in_host_ = host_location;
 268   MoveCursorToNative(host_location);
 269   client::CursorClient* cursor_client = client::GetCursorClient(window());
 270   if (cursor_client) {
 271     const gfx::Display& display =
 272         gfx::Screen::GetScreenFor(window())->GetDisplayNearestWindow(window());
 273     cursor_client->SetDisplay(display);
 274   }
 275   dispatcher()->OnCursorMovedToRootLocation(root_location);
 276 }
 277
 278 }  // namespace aura