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