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/thread_task_runner_handle.h"
   8 #include "base/trace_event/trace_event.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/ime/input_method.h"
  17 #include "ui/base/ime/input_method_factory.h"
  18 #include "ui/base/view_prop.h"
  19 #include "ui/compositor/dip_util.h"
  20 #include "ui/compositor/layer.h"
  21 #include "ui/gfx/display.h"
  22 #include "ui/gfx/geometry/insets.h"
  23 #include "ui/gfx/geometry/point.h"
  24 #include "ui/gfx/geometry/point3_f.h"
  25 #include "ui/gfx/geometry/point_conversions.h"
  26 #include "ui/gfx/geometry/size_conversions.h"
  27 #include "ui/gfx/screen.h"
  28
  29 namespace aura {
  30
  31 const char kWindowTreeHostForAcceleratedWidget[] =
  32     "__AURA_WINDOW_TREE_HOST_ACCELERATED_WIDGET__";
  33
  34 float GetDeviceScaleFactorFromDisplay(Window* window) {
  35   gfx::Display display = gfx::Screen::GetScreenFor(window)->
  36       GetDisplayNearestWindow(window);
  37   DCHECK(display.is_valid());
  38   return display.device_scale_factor();
  39 }
  40
  41 ////////////////////////////////////////////////////////////////////////////////
  42 // WindowTreeHost, public:
  43
  44 WindowTreeHost::~WindowTreeHost() {
  45   DCHECK(!compositor_) << "compositor must be destroyed before root window";
  46   if (owned_input_method_) {
  47     delete input_method_;
  48     input_method_ = nullptr;
  49   }
  50 }
  51
  52 #if defined(OS_ANDROID)
  53 // static
  54 WindowTreeHost* WindowTreeHost::Create(const gfx::Rect& bounds) {
  55   // This is only hit for tests and ash, right now these aren't an issue so
  56   // adding the CHECK.
  57   // TODO(sky): decide if we want a factory.
  58   CHECK(false);
  59   return nullptr;
  60 }
  61 #endif
  62
  63 // static
  64 WindowTreeHost* WindowTreeHost::GetForAcceleratedWidget(
  65     gfx::AcceleratedWidget widget) {
  66   return reinterpret_cast<WindowTreeHost*>(
  67       ui::ViewProp::GetValue(widget, kWindowTreeHostForAcceleratedWidget));
  68 }
  69
  70 void WindowTreeHost::InitHost() {
  71   InitCompositor();
  72   UpdateRootWindowSize(GetBounds().size());
  73   Env::GetInstance()->NotifyHostInitialized(this);
  74   window()->Show();
  75 }
  76
  77 void WindowTreeHost::InitCompositor() {
  78   compositor_->SetScaleAndSize(GetDeviceScaleFactorFromDisplay(window()),
  79                                GetBounds().size());
  80   compositor_->SetRootLayer(window()->layer());
  81 }
  82
  83 void WindowTreeHost::AddObserver(WindowTreeHostObserver* observer) {
  84   observers_.AddObserver(observer);
  85 }
  86
  87 void WindowTreeHost::RemoveObserver(WindowTreeHostObserver* observer) {
  88   observers_.RemoveObserver(observer);
  89 }
  90
  91 ui::EventProcessor* WindowTreeHost::event_processor() {
  92   return dispatcher();
  93 }
  94
  95 gfx::Transform WindowTreeHost::GetRootTransform() const {
  96   float scale = ui::GetDeviceScaleFactor(window()->layer());
  97   gfx::Transform transform;
  98   transform.Scale(scale, scale);
  99   transform *= window()->layer()->transform();
 100   return transform;
 101 }
 102
 103 void WindowTreeHost::SetRootTransform(const gfx::Transform& transform) {
 104   window()->SetTransform(transform);
 105   UpdateRootWindowSize(GetBounds().size());
 106 }
 107
 108 gfx::Transform WindowTreeHost::GetInverseRootTransform() const {
 109   gfx::Transform invert;
 110   gfx::Transform transform = GetRootTransform();
 111   if (!transform.GetInverse(&invert))
 112     return transform;
 113   return invert;
 114 }
 115
 116 void WindowTreeHost::UpdateRootWindowSize(const gfx::Size& host_size) {
 117   gfx::Rect bounds(host_size);
 118   gfx::RectF new_bounds(ui::ConvertRectToDIP(window()->layer(), bounds));
 119   window()->layer()->transform().TransformRect(&new_bounds);
 120   window()->SetBounds(gfx::Rect(gfx::ToFlooredSize(new_bounds.size())));
 121 }
 122
 123 void WindowTreeHost::ConvertPointToNativeScreen(gfx::Point* point) const {
 124   ConvertPointToHost(point);
 125   gfx::Point location = GetLocationOnNativeScreen();
 126   point->Offset(location.x(), location.y());
 127 }
 128
 129 void WindowTreeHost::ConvertPointFromNativeScreen(gfx::Point* point) const {
 130   gfx::Point location = GetLocationOnNativeScreen();
 131   point->Offset(-location.x(), -location.y());
 132   ConvertPointFromHost(point);
 133 }
 134
 135 void WindowTreeHost::ConvertPointToHost(gfx::Point* point) const {
 136   gfx::Point3F point_3f(*point);
 137   GetRootTransform().TransformPoint(&point_3f);
 138   *point = gfx::ToFlooredPoint(point_3f.AsPointF());
 139 }
 140
 141 void WindowTreeHost::ConvertPointFromHost(gfx::Point* point) const {
 142   gfx::Point3F point_3f(*point);
 143   GetInverseRootTransform().TransformPoint(&point_3f);
 144   *point = gfx::ToFlooredPoint(point_3f.AsPointF());
 145 }
 146
 147 void WindowTreeHost::SetCursor(gfx::NativeCursor cursor) {
 148   last_cursor_ = cursor;
 149   // A lot of code seems to depend on NULL cursors actually showing an arrow,
 150   // so just pass everything along to the host.
 151   SetCursorNative(cursor);
 152 }
 153
 154 void WindowTreeHost::OnCursorVisibilityChanged(bool show) {
 155   // Clear any existing mouse hover effects when the cursor becomes invisible.
 156   // Note we do not need to dispatch a mouse enter when the cursor becomes
 157   // visible because that can only happen in response to a mouse event, which
 158   // will trigger its own mouse enter.
 159   if (!show) {
 160     ui::EventDispatchDetails details = dispatcher()->DispatchMouseExitAtPoint(
 161         nullptr, dispatcher()->GetLastMouseLocationInRoot());
 162     if (details.dispatcher_destroyed)
 163       return;
 164   }
 165
 166   OnCursorVisibilityChangedNative(show);
 167 }
 168
 169 void WindowTreeHost::MoveCursorTo(const gfx::Point& location_in_dip) {
 170   gfx::Point host_location(location_in_dip);
 171   ConvertPointToHost(&host_location);
 172   MoveCursorToInternal(location_in_dip, host_location);
 173 }
 174
 175 void WindowTreeHost::MoveCursorToHostLocation(const gfx::Point& host_location) {
 176   gfx::Point root_location(host_location);
 177   ConvertPointFromHost(&root_location);
 178   MoveCursorToInternal(root_location, host_location);
 179 }
 180
 181 ui::InputMethod* WindowTreeHost::GetInputMethod() {
 182   if (!input_method_) {
 183     input_method_ =
 184         ui::CreateInputMethod(this, GetAcceleratedWidget()).release();
 185     owned_input_method_ = true;
 186   }
 187   return input_method_;
 188 }
 189
 190 void WindowTreeHost::SetSharedInputMethod(ui::InputMethod* input_method) {
 191   DCHECK(!input_method_);
 192   input_method_ = input_method;
 193   owned_input_method_ = false;
 194 }
 195
 196 ui::EventDispatchDetails WindowTreeHost::DispatchKeyEventPostIME(
 197     ui::KeyEvent* event) {
 198   return SendEventToProcessor(event);
 199 }
 200
 201 void WindowTreeHost::Show() {
 202   if (compositor())
 203     compositor()->SetVisible(true);
 204   ShowImpl();
 205 }
 206
 207 void WindowTreeHost::Hide() {
 208   HideImpl();
 209   if (compositor())
 210     compositor()->SetVisible(false);
 211 }
 212
 213 ////////////////////////////////////////////////////////////////////////////////
 214 // WindowTreeHost, protected:
 215
 216 WindowTreeHost::WindowTreeHost()
 217     : window_(new Window(nullptr)),
 218       last_cursor_(ui::kCursorNull),
 219       input_method_(nullptr),
 220       owned_input_method_(false) {
 221 }
 222
 223 void WindowTreeHost::DestroyCompositor() {
 224   compositor_.reset();
 225 }
 226
 227 void WindowTreeHost::DestroyDispatcher() {
 228   delete window_;
 229   window_ = nullptr;
 230   dispatcher_.reset();
 231
 232   // TODO(beng): this comment is no longer quite valid since this function
 233   // isn't called from WED, and WED isn't a subclass of Window. So it seems
 234   // like we could just rely on ~Window now.
 235   // Destroy child windows while we're still valid. This is also done by
 236   // ~Window, but by that time any calls to virtual methods overriden here (such
 237   // as GetRootWindow()) result in Window's implementation. By destroying here
 238   // we ensure GetRootWindow() still returns this.
 239   //window()->RemoveOrDestroyChildren();
 240 }
 241
 242 void WindowTreeHost::CreateCompositor() {
 243   DCHECK(Env::GetInstance());
 244   ui::ContextFactory* context_factory = Env::GetInstance()->context_factory();
 245   DCHECK(context_factory);
 246   compositor_.reset(
 247       new ui::Compositor(context_factory, base::ThreadTaskRunnerHandle::Get()));
 248   if (!dispatcher()) {
 249     window()->Init(ui::LAYER_NOT_DRAWN);
 250     window()->set_host(this);
 251     window()->SetName("RootWindow");
 252     window()->SetEventTargeter(
 253         scoped_ptr<ui::EventTargeter>(new WindowTargeter()));
 254     dispatcher_.reset(new WindowEventDispatcher(this));
 255   }
 256 }
 257
 258 void WindowTreeHost::OnAcceleratedWidgetAvailable() {
 259   compositor_->SetAcceleratedWidgetAndStartCompositor(GetAcceleratedWidget());
 260   prop_.reset(new ui::ViewProp(GetAcceleratedWidget(),
 261                                kWindowTreeHostForAcceleratedWidget, this));
 262 }
 263
 264 void WindowTreeHost::OnHostMoved(const gfx::Point& new_location) {
 265   TRACE_EVENT1("ui", "WindowTreeHost::OnHostMoved",
 266                "origin", new_location.ToString());
 267
 268   FOR_EACH_OBSERVER(WindowTreeHostObserver, observers_,
 269                     OnHostMoved(this, new_location));
 270 }
 271
 272 void WindowTreeHost::OnHostResized(const gfx::Size& new_size) {
 273   // The compositor should have the same size as the native root window host.
 274   // Get the latest scale from display because it might have been changed.
 275   compositor_->SetScaleAndSize(GetDeviceScaleFactorFromDisplay(window()),
 276                                new_size);
 277
 278   gfx::Size layer_size = GetBounds().size();
 279   // The layer, and the observers should be notified of the
 280   // transformed size of the root window.
 281   UpdateRootWindowSize(layer_size);
 282   FOR_EACH_OBSERVER(WindowTreeHostObserver, observers_, OnHostResized(this));
 283 }
 284
 285 void WindowTreeHost::OnHostCloseRequested() {
 286   FOR_EACH_OBSERVER(WindowTreeHostObserver, observers_,
 287                     OnHostCloseRequested(this));
 288 }
 289
 290 void WindowTreeHost::OnHostActivated() {
 291   Env::GetInstance()->NotifyHostActivated(this);
 292 }
 293
 294 void WindowTreeHost::OnHostLostWindowCapture() {
 295   Window* capture_window = client::GetCaptureWindow(window());
 296   if (capture_window && capture_window->GetRootWindow() == window())
 297     capture_window->ReleaseCapture();
 298 }
 299
 300 ui::EventProcessor* WindowTreeHost::GetEventProcessor() {
 301   return event_processor();
 302 }
 303
 304 ////////////////////////////////////////////////////////////////////////////////
 305 // WindowTreeHost, private:
 306
 307 void WindowTreeHost::MoveCursorToInternal(const gfx::Point& root_location,
 308                                           const gfx::Point& host_location) {
 309   last_cursor_request_position_in_host_ = host_location;
 310   MoveCursorToNative(host_location);
 311   client::CursorClient* cursor_client = client::GetCursorClient(window());
 312   if (cursor_client) {
 313     const gfx::Display& display =
 314         gfx::Screen::GetScreenFor(window())->GetDisplayNearestWindow(window());
 315     cursor_client->SetDisplay(display);
 316   }
 317   dispatcher()->OnCursorMovedToRootLocation(root_location);
 318 }
 319
 320 }  // namespace aura