Create a mirror window.

ash/display/mirror_window_controller.cc

Index: ash/display/mirror_window_controller.cc
diff --git a/ash/display/mirror_window_controller.cc b/ash/display/mirror_window_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4297e3c1047e956fbc94fd6ab705a7d28c615e6f
--- /dev/null
+++ b/ash/display/mirror_window_controller.cc
@@ -0,0 +1,217 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ash/display/mirror_window_controller.h"
+
+#if defined(USE_X11)
+#include <X11/Xlib.h>
+
+// Xlib.h defines RootWindow.
+#undef RootWindow
+#endif
+
+#include "ash/display/display_info.h"
+#include "ash/display/display_manager.h"
+#include "ash/host/root_window_host_factory.h"
+#include "ash/shell.h"
+#include "base/stringprintf.h"
+#include "ui/aura/client/capture_client.h"
+#include "ui/aura/env.h"
+#include "ui/aura/root_window.h"
+#include "ui/aura/window_delegate.h"
+#include "ui/base/cursor/cursors_aura.h"
+#include "ui/base/hit_test.h"
+#include "ui/base/layout.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/compositor/compositor.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace ash {
+namespace internal {
+namespace {
+
+#if defined(USE_X11)
+void DisableInput(XID window) {
+  long event_mask = ExposureMask | VisibilityChangeMask |
+      StructureNotifyMask | PropertyChangeMask;
+  XSelectInput(base::MessagePumpAuraX11::GetDefaultXDisplay(),

[James Cook, 2013/05/21 08:07:41]

Comment this? Is it disabling input by selecting only the flags but not
mouse/keyboard events?

[oshima, 2013/05/21 14:41:50]

I think it's pretty clear from the method name, and also from the impl. I added
why it needs to disable input instead though.

+               window, event_mask);
+}
+#endif
+
+class NoneCaptureClient : public aura::client::CaptureClient {
+ public:
+  NoneCaptureClient() {}
+  virtual ~NoneCaptureClient() {}
+
+ private:
+  // Does a capture on the |window|.
+  virtual void SetCapture(aura::Window* window) OVERRIDE {}
+
+  // Releases a capture from the |window|.
+  virtual void ReleaseCapture(aura::Window* window) OVERRIDE {}
+
+  // Returns the current capture window.
+  virtual aura::Window* GetCaptureWindow() OVERRIDE {
+    return NULL;
+  }
+
+  DISALLOW_COPY_AND_ASSIGN(NoneCaptureClient);
+};
+
+}  // namespace
+
+class CursorWindowDelegate : public aura::WindowDelegate {
+ public:
+  CursorWindowDelegate() {}
+  virtual ~CursorWindowDelegate() {}
+
+  // aura::WindowDelegate overrides:
+  virtual gfx::Size GetMinimumSize() const OVERRIDE {
+    return cursor_image_.size();
+  }
+  virtual gfx::Size GetMaximumSize() const OVERRIDE {
+    return cursor_image_.size();
+  }
+  virtual void OnBoundsChanged(const gfx::Rect& old_bounds,
+                               const gfx::Rect& new_bounds) OVERRIDE {
+  }
+  virtual gfx::NativeCursor GetCursor(const gfx::Point& point) OVERRIDE {
+    return gfx::kNullCursor;
+  }
+  virtual int GetNonClientComponent(
+      const gfx::Point& point) const OVERRIDE {
+    return HTNOWHERE;
+  }
+  virtual bool ShouldDescendIntoChildForEventHandling(
+      aura::Window* child,
+      const gfx::Point& location) OVERRIDE {
+    return false;
+  }
+  virtual bool CanFocus() OVERRIDE {
+    return false;
+  }
+  virtual void OnCaptureLost() OVERRIDE {
+  }
+  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
+    canvas->DrawImageInt(cursor_image_, 0, 0);
+  }
+  virtual void OnDeviceScaleFactorChanged(
+      float device_scale_factor) OVERRIDE {
+  }
+  virtual void OnWindowDestroying() OVERRIDE {}
+  virtual void OnWindowDestroyed() OVERRIDE {}
+  virtual void OnWindowTargetVisibilityChanged(bool visible) OVERRIDE {
+  }
+  virtual bool HasHitTestMask() const OVERRIDE {
+    return false;
+  }
+  virtual void GetHitTestMask(gfx::Path* mask) const OVERRIDE {}
+  virtual scoped_refptr<ui::Texture> CopyTexture() OVERRIDE {
+    NOTREACHED();
+    return scoped_refptr<ui::Texture>();
+  }
+
+  void SetCursorImage(const gfx::ImageSkia& image) {
+    cursor_image_ = image;
+  }
+
+ private:
+  gfx::ImageSkia cursor_image_;
+
+  DISALLOW_COPY_AND_ASSIGN(CursorWindowDelegate);
+};
+
+MirrorWindowController::MirrorWindowController()
+    : current_cursor_type_(ui::kCursorNone),
+      cursor_window_(NULL),
+      cursor_window_delegate_(new CursorWindowDelegate) {
+}
+
+MirrorWindowController::~MirrorWindowController() {
+  // Make sure the root window gets deleted before cursor_window_delegate.
+  root_window_.reset();
+}
+
+void MirrorWindowController::UpdateWindow(const DisplayInfo& display_info) {
+  static int mirror_root_window_count = 0;
+  if (root_window_.get()) {
+    root_window_->SetHostBounds(display_info.bounds_in_pixel());
+    return;
+  }
+  Shell* shell = Shell::GetInstance();
+  const gfx::Rect& bounds_in_pixel = display_info.bounds_in_pixel();
+  aura::RootWindow::CreateParams params(bounds_in_pixel);
+  params.host = shell->root_window_host_factory()->
+      CreateRootWindowHost(bounds_in_pixel);
+  root_window_.reset(new aura::RootWindow(params));
+  root_window_->SetName(
+      base::StringPrintf("MirrorRootWindow-%d", mirror_root_window_count++));
+  root_window_->compositor()->SetBackgroundColor(SK_ColorBLACK);
+  // No need to remove RootWindowObserver because
+  // the DisplayManager object outlives RootWindow objects.
+  root_window_->AddRootWindowObserver(shell->display_manager());
+  // TODO(oshima): TouchHUD is using idkey.
+  root_window_->SetProperty(internal::kDisplayIdKey, display_info.id());
+  root_window_->Init();
+#if defined(USE_X11)
+  DisableInput(root_window_->GetAcceleratedWidget());
+#endif
+  aura::client::SetCaptureClient(root_window_.get(), new NoneCaptureClient());
+  root_window_->ShowRootWindow();
+
+  cursor_window_ = new aura::Window(cursor_window_delegate_.get());
+  cursor_window_->Init(ui::LAYER_TEXTURED);
+  root_window_->AddChild(cursor_window_);
+  cursor_window_->Show();
+}
+
+void MirrorWindowController::Close() {
+  if (root_window_.get()) {
+    NoneCaptureClient* capture_client = static_cast<NoneCaptureClient*>(
+        aura::client::GetCaptureClient(root_window_.get()));

[James Cook, 2013/05/21 08:07:41]

Do you also need to SetCaptureClient() to NONE, or is that handled in the
destructor for root_window_?

[oshima, 2013/05/21 14:41:50]

No, it's not owned by RootWindow.

+    delete capture_client;
+    root_window_.reset();
+    cursor_window_ = NULL;
+  }
+}
+
+void MirrorWindowController::UpdateCursorLocation() {
+  if (cursor_window_) {
+    gfx::Point point = aura::Env::GetInstance()->last_mouse_location();
+    point.Offset(-hot_point_.x(), -hot_point_.y());
+    gfx::Rect bounds = cursor_window_->bounds();
+    bounds.set_origin(point); // use hot point.

[James Cook, 2013/05/21 08:07:41]

Two spaces before "// Use hot point."

[oshima, 2013/05/21 14:41:50]

This was reminder for myself, which I forgot to remove. Thank you for catching.
Removed.

+    cursor_window_->SetBounds(bounds);
+  }
+}
+
+void MirrorWindowController::SetMirroredCursor(gfx::NativeCursor cursor) {
+  if (current_cursor_type_ == cursor.native_type())
+    return;
+  current_cursor_type_ = cursor.native_type();
+  int resource_id;
+  bool success = ui::GetCursorDataFor(
+      current_cursor_type_, 1.0, &resource_id, &hot_point_);
+  if (!success)
+    return;
+  const gfx::ImageSkia* image =
+      ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
+  cursor_window_delegate_->SetCursorImage(*image);
+  if (cursor_window_) {
+    cursor_window_->SchedulePaintInRect(
+        gfx::Rect(cursor_window_->bounds().size()));
+    UpdateCursorLocation();
+  }
+}
+
+void MirrorWindowController::SetMirroredCursorVisibility(bool visible) {
+  if (cursor_window_)
+    visible ? cursor_window_->Show() : cursor_window_->Hide();
+}
+
+}  // namespace internal
+}  // namespace ash