ash/display/cursor_window_controller.cc - chromium/src - Git at Google

 // Copyright 2014 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/cursor_window_controller.h"

 #include "ash/common/shell_window_ids.h"
 #include "ash/display/display_manager.h"
 #include "ash/display/mirror_window_controller.h"
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/base/cursor/cursors_aura.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/compositor/dip_util.h"
 #include "ui/compositor/paint_recorder.h"
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/geometry/dip_util.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/gfx/image/image_skia_operations.h"

 namespace ash {

 class CursorWindowDelegate : public aura::WindowDelegate {
  public:
   CursorWindowDelegate() {}
   ~CursorWindowDelegate() override {}

   // aura::WindowDelegate overrides:
   gfx::Size GetMinimumSize() const override { return size_; }
   gfx::Size GetMaximumSize() const override { return size_; }
   void OnBoundsChanged(const gfx::Rect& old_bounds,
                        const gfx::Rect& new_bounds) override {}
   gfx::NativeCursor GetCursor(const gfx::Point& point) override {
     return gfx::kNullCursor;
   }
   int GetNonClientComponent(const gfx::Point& point) const override {
     return HTNOWHERE;
   }
   bool ShouldDescendIntoChildForEventHandling(
       aura::Window* child,
       const gfx::Point& location) override {
     return false;
   }
   bool CanFocus() override { return false; }
   void OnCaptureLost() override {}
   void OnPaint(const ui::PaintContext& context) override {
     // No need to cache the output here, the CursorWindow is not invalidated.
     ui::PaintRecorder recorder(context, size_);
     recorder.canvas()->DrawImageInt(cursor_image_, 0, 0);
   }
   void OnDeviceScaleFactorChanged(float device_scale_factor) override {}
   void OnWindowDestroying(aura::Window* window) override {}
   void OnWindowDestroyed(aura::Window* window) override {}
   void OnWindowTargetVisibilityChanged(bool visible) override {}
   bool HasHitTestMask() const override { return false; }
   void GetHitTestMask(gfx::Path* mask) const override {}

   // Sets the cursor image for the |display|'s scale factor.
   void SetCursorImage(const gfx::Size& size, const gfx::ImageSkia& image) {
     size_ = size;
     cursor_image_ = image;
   }

   const gfx::Size& size() const { return size_; }
   const gfx::ImageSkia& cursor_image() const { return cursor_image_; }

  private:
   gfx::ImageSkia cursor_image_;
   gfx::Size size_;

   DISALLOW_COPY_AND_ASSIGN(CursorWindowDelegate);
 };

 CursorWindowController::CursorWindowController()
     : is_cursor_compositing_enabled_(false),
       container_(NULL),
       cursor_type_(ui::kCursorNone),
       visible_(true),
       cursor_set_(ui::CURSOR_SET_NORMAL),
       delegate_(new CursorWindowDelegate()) {}

 CursorWindowController::~CursorWindowController() {
   SetContainer(NULL);
 }

 void CursorWindowController::SetCursorCompositingEnabled(bool enabled) {
   if (is_cursor_compositing_enabled_ != enabled) {
     is_cursor_compositing_enabled_ = enabled;
     if (display_.is_valid())
       UpdateCursorImage();
     UpdateContainer();
   }
 }

 void CursorWindowController::UpdateContainer() {
   if (is_cursor_compositing_enabled_) {
     display::Screen* screen = display::Screen::GetScreen();
     display::Display display =
         screen->GetDisplayNearestPoint(screen->GetCursorScreenPoint());
     DCHECK(display.is_valid());
     if (display.is_valid())
       SetDisplay(display);
   } else {
     aura::Window* mirror_window = Shell::GetInstance()
                                       ->window_tree_host_manager()
                                       ->mirror_window_controller()
                                       ->GetWindow();
     if (mirror_window)
       display_ = display::Screen::GetScreen()->GetPrimaryDisplay();
     SetContainer(mirror_window);
   }
   // Updates the hot point based on the current display.
   UpdateCursorImage();
 }

 void CursorWindowController::SetDisplay(const display::Display& display) {
   if (!is_cursor_compositing_enabled_)
     return;

   // TODO(oshima): Do not updatethe composition cursor when crossing
   // display in unified desktop mode for now. crbug.com/517222.
   if (Shell::GetInstance()->display_manager()->IsInUnifiedMode() &&
       display.id() != DisplayManager::kUnifiedDisplayId) {
     return;
   }

   display_ = display;
   aura::Window* root_window = Shell::GetInstance()
                                   ->window_tree_host_manager()
                                   ->GetRootWindowForDisplayId(display.id());
   if (!root_window)
     return;

   SetContainer(GetRootWindowController(root_window)
                    ->GetContainer(kShellWindowId_MouseCursorContainer));
   SetBoundsInScreen(display.bounds());
   // Updates the hot point based on the current display.
   UpdateCursorImage();
 }

 void CursorWindowController::UpdateLocation() {
   if (!cursor_window_)
     return;
   gfx::Point point = aura::Env::GetInstance()->last_mouse_location();
   if (!is_cursor_compositing_enabled_) {
     Shell::GetPrimaryRootWindow()->GetHost()->ConvertPointToHost(&point);
   } else {
     point.Offset(-bounds_in_screen_.x(), -bounds_in_screen_.y());
   }
   point.Offset(-hot_point_.x(), -hot_point_.y());
   gfx::Rect bounds = cursor_window_->bounds();
   bounds.set_origin(point);
   cursor_window_->SetBounds(bounds);
 }

 void CursorWindowController::SetCursor(gfx::NativeCursor cursor) {
   if (cursor_type_ == cursor.native_type())
     return;
   cursor_type_ = cursor.native_type();
   UpdateCursorImage();
   UpdateCursorVisibility();
 }

 void CursorWindowController::SetCursorSet(ui::CursorSetType cursor_set) {
   cursor_set_ = cursor_set;
   UpdateCursorImage();
 }

 void CursorWindowController::SetVisibility(bool visible) {
   visible_ = visible;
   UpdateCursorVisibility();
 }

 void CursorWindowController::SetContainer(aura::Window* container) {
   if (container_ == container)
     return;
   container_ = container;
   if (!container) {
     cursor_window_.reset();
     return;
   }

   // Reusing the window does not work when the display is disconnected.
   // Just creates a new one instead. crbug.com/384218.
   cursor_window_.reset(new aura::Window(delegate_.get()));
   cursor_window_->SetTransparent(true);
   cursor_window_->Init(ui::LAYER_TEXTURED);
   cursor_window_->set_ignore_events(true);
   cursor_window_->set_owned_by_parent(false);
   // Call UpdateCursorImage() to figure out |cursor_window_|'s desired size.
   UpdateCursorImage();

   container->AddChild(cursor_window_.get());
   UpdateCursorVisibility();
   SetBoundsInScreen(container->bounds());
 }

 void CursorWindowController::SetBoundsInScreen(const gfx::Rect& bounds) {
   bounds_in_screen_ = bounds;
   UpdateLocation();
 }

 void CursorWindowController::UpdateCursorImage() {
   float cursor_scale;
   if (!is_cursor_compositing_enabled_) {
     cursor_scale = display_.device_scale_factor();
   } else {
     // Use the original device scale factor instead of the display's, which
     // might have been adjusted for the UI scale.
     const float original_scale = Shell::GetInstance()
                                      ->display_manager()
                                      ->GetDisplayInfo(display_.id())
                                      .device_scale_factor();
     // And use the nearest resource scale factor.
     cursor_scale =
         ui::GetScaleForScaleFactor(ui::GetSupportedScaleFactor(original_scale));
   }
   int resource_id;
   // TODO(hshi): support custom cursor set.
   if (!ui::GetCursorDataFor(cursor_set_, cursor_type_, cursor_scale,
                             &resource_id, &hot_point_)) {
     return;
   }
   const gfx::ImageSkia* image =
       ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
   if (!is_cursor_compositing_enabled_) {
     gfx::ImageSkia rotated = *image;
     switch (display_.rotation()) {
       case display::Display::ROTATE_0:
         break;
       case display::Display::ROTATE_90:
         rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
             *image, SkBitmapOperations::ROTATION_90_CW);
         hot_point_.SetPoint(rotated.width() - hot_point_.y(), hot_point_.x());
         break;
       case display::Display::ROTATE_180:
         rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
             *image, SkBitmapOperations::ROTATION_180_CW);
         hot_point_.SetPoint(rotated.height() - hot_point_.x(),
                             rotated.width() - hot_point_.y());
         break;
       case display::Display::ROTATE_270:
         rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
             *image, SkBitmapOperations::ROTATION_270_CW);
         hot_point_.SetPoint(hot_point_.y(), rotated.height() - hot_point_.x());
         break;
     }
     // Note that mirror window's scale factor is always 1.0f, therefore we
     // need to take 2x's image and paint as if it's 1x image.
     const gfx::ImageSkiaRep& image_rep =
         rotated.GetRepresentation(cursor_scale);
     delegate_->SetCursorImage(
         image_rep.pixel_size(),
         gfx::ImageSkia::CreateFrom1xBitmap(image_rep.sk_bitmap()));
   } else {
     const gfx::ImageSkiaRep& image_rep = image->GetRepresentation(cursor_scale);
     delegate_->SetCursorImage(
         image->size(),
         gfx::ImageSkia(gfx::ImageSkiaRep(image_rep.sk_bitmap(), cursor_scale)));
     hot_point_ = gfx::ConvertPointToDIP(cursor_scale, hot_point_);
   }
   if (cursor_window_) {
     cursor_window_->SetBounds(gfx::Rect(delegate_->size()));
     cursor_window_->SchedulePaintInRect(
         gfx::Rect(cursor_window_->bounds().size()));
     UpdateLocation();
   }
 }

 void CursorWindowController::UpdateCursorVisibility() {
   if (!cursor_window_)
     return;
   bool visible = (visible_ && cursor_type_ != ui::kCursorNone);
   if (visible)
     cursor_window_->Show();
   else
     cursor_window_->Hide();
 }

 const gfx::ImageSkia& CursorWindowController::GetCursorImageForTest() const {
   return delegate_->cursor_image();
 }

 }  // namespace ash
	// Copyright 2014 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/cursor_window_controller.h"

	#include "ash/common/shell_window_ids.h"
	#include "ash/display/display_manager.h"
	#include "ash/display/mirror_window_controller.h"
	#include "ash/display/window_tree_host_manager.h"
	#include "ash/root_window_controller.h"
	#include "ash/shell.h"
	#include "ui/aura/env.h"
	#include "ui/aura/window_delegate.h"
	#include "ui/aura/window_event_dispatcher.h"
	#include "ui/base/cursor/cursors_aura.h"
	#include "ui/base/hit_test.h"
	#include "ui/base/resource/resource_bundle.h"
	#include "ui/compositor/dip_util.h"
	#include "ui/compositor/paint_recorder.h"
	#include "ui/display/display.h"
	#include "ui/display/screen.h"
	#include "ui/gfx/canvas.h"
	#include "ui/gfx/geometry/dip_util.h"
	#include "ui/gfx/image/image_skia.h"
	#include "ui/gfx/image/image_skia_operations.h"

	namespace ash {

	class CursorWindowDelegate : public aura::WindowDelegate {
	public:
	CursorWindowDelegate() {}
	~CursorWindowDelegate() override {}

	// aura::WindowDelegate overrides:
	gfx::Size GetMinimumSize() const override { return size_; }
	gfx::Size GetMaximumSize() const override { return size_; }
	void OnBoundsChanged(const gfx::Rect& old_bounds,
	const gfx::Rect& new_bounds) override {}
	gfx::NativeCursor GetCursor(const gfx::Point& point) override {
	return gfx::kNullCursor;
	}
	int GetNonClientComponent(const gfx::Point& point) const override {
	return HTNOWHERE;
	}
	bool ShouldDescendIntoChildForEventHandling(
	aura::Window* child,
	const gfx::Point& location) override {
	return false;
	}
	bool CanFocus() override { return false; }
	void OnCaptureLost() override {}
	void OnPaint(const ui::PaintContext& context) override {
	// No need to cache the output here, the CursorWindow is not invalidated.
	ui::PaintRecorder recorder(context, size_);
	recorder.canvas()->DrawImageInt(cursor_image_, 0, 0);
	}
	void OnDeviceScaleFactorChanged(float device_scale_factor) override {}
	void OnWindowDestroying(aura::Window* window) override {}
	void OnWindowDestroyed(aura::Window* window) override {}
	void OnWindowTargetVisibilityChanged(bool visible) override {}
	bool HasHitTestMask() const override { return false; }
	void GetHitTestMask(gfx::Path* mask) const override {}

	// Sets the cursor image for the \|display\|'s scale factor.
	void SetCursorImage(const gfx::Size& size, const gfx::ImageSkia& image) {
	size_ = size;
	cursor_image_ = image;
	}

	const gfx::Size& size() const { return size_; }
	const gfx::ImageSkia& cursor_image() const { return cursor_image_; }

	private:
	gfx::ImageSkia cursor_image_;
	gfx::Size size_;

	DISALLOW_COPY_AND_ASSIGN(CursorWindowDelegate);
	};

	CursorWindowController::CursorWindowController()
	: is_cursor_compositing_enabled_(false),
	container_(NULL),
	cursor_type_(ui::kCursorNone),
	visible_(true),
	cursor_set_(ui::CURSOR_SET_NORMAL),
	delegate_(new CursorWindowDelegate()) {}

	CursorWindowController::~CursorWindowController() {
	SetContainer(NULL);
	}

	void CursorWindowController::SetCursorCompositingEnabled(bool enabled) {
	if (is_cursor_compositing_enabled_ != enabled) {
	is_cursor_compositing_enabled_ = enabled;
	if (display_.is_valid())
	UpdateCursorImage();
	UpdateContainer();
	}
	}

	void CursorWindowController::UpdateContainer() {
	if (is_cursor_compositing_enabled_) {
	display::Screen* screen = display::Screen::GetScreen();
	display::Display display =
	screen->GetDisplayNearestPoint(screen->GetCursorScreenPoint());
	DCHECK(display.is_valid());
	if (display.is_valid())
	SetDisplay(display);
	} else {
	aura::Window* mirror_window = Shell::GetInstance()
	->window_tree_host_manager()
	->mirror_window_controller()
	->GetWindow();
	if (mirror_window)
	display_ = display::Screen::GetScreen()->GetPrimaryDisplay();
	SetContainer(mirror_window);
	}
	// Updates the hot point based on the current display.
	UpdateCursorImage();
	}

	void CursorWindowController::SetDisplay(const display::Display& display) {
	if (!is_cursor_compositing_enabled_)
	return;

	// TODO(oshima): Do not updatethe composition cursor when crossing
	// display in unified desktop mode for now. crbug.com/517222.
	if (Shell::GetInstance()->display_manager()->IsInUnifiedMode() &&
	display.id() != DisplayManager::kUnifiedDisplayId) {
	return;
	}

	display_ = display;
	aura::Window* root_window = Shell::GetInstance()
	->window_tree_host_manager()
	->GetRootWindowForDisplayId(display.id());
	if (!root_window)
	return;

	SetContainer(GetRootWindowController(root_window)
	->GetContainer(kShellWindowId_MouseCursorContainer));
	SetBoundsInScreen(display.bounds());
	// Updates the hot point based on the current display.
	UpdateCursorImage();
	}

	void CursorWindowController::UpdateLocation() {
	if (!cursor_window_)
	return;
	gfx::Point point = aura::Env::GetInstance()->last_mouse_location();
	if (!is_cursor_compositing_enabled_) {
	Shell::GetPrimaryRootWindow()->GetHost()->ConvertPointToHost(&point);
	} else {
	point.Offset(-bounds_in_screen_.x(), -bounds_in_screen_.y());
	}
	point.Offset(-hot_point_.x(), -hot_point_.y());
	gfx::Rect bounds = cursor_window_->bounds();
	bounds.set_origin(point);
	cursor_window_->SetBounds(bounds);
	}

	void CursorWindowController::SetCursor(gfx::NativeCursor cursor) {
	if (cursor_type_ == cursor.native_type())
	return;
	cursor_type_ = cursor.native_type();
	UpdateCursorImage();
	UpdateCursorVisibility();
	}

	void CursorWindowController::SetCursorSet(ui::CursorSetType cursor_set) {
	cursor_set_ = cursor_set;
	UpdateCursorImage();
	}

	void CursorWindowController::SetVisibility(bool visible) {
	visible_ = visible;
	UpdateCursorVisibility();
	}

	void CursorWindowController::SetContainer(aura::Window* container) {
	if (container_ == container)
	return;
	container_ = container;
	if (!container) {
	cursor_window_.reset();
	return;
	}

	// Reusing the window does not work when the display is disconnected.
	// Just creates a new one instead. crbug.com/384218.
	cursor_window_.reset(new aura::Window(delegate_.get()));
	cursor_window_->SetTransparent(true);
	cursor_window_->Init(ui::LAYER_TEXTURED);
	cursor_window_->set_ignore_events(true);
	cursor_window_->set_owned_by_parent(false);
	// Call UpdateCursorImage() to figure out \|cursor_window_\|'s desired size.
	UpdateCursorImage();

	container->AddChild(cursor_window_.get());
	UpdateCursorVisibility();
	SetBoundsInScreen(container->bounds());
	}

	void CursorWindowController::SetBoundsInScreen(const gfx::Rect& bounds) {
	bounds_in_screen_ = bounds;
	UpdateLocation();
	}

	void CursorWindowController::UpdateCursorImage() {
	float cursor_scale;
	if (!is_cursor_compositing_enabled_) {
	cursor_scale = display_.device_scale_factor();
	} else {
	// Use the original device scale factor instead of the display's, which
	// might have been adjusted for the UI scale.
	const float original_scale = Shell::GetInstance()
	->display_manager()
	->GetDisplayInfo(display_.id())
	.device_scale_factor();
	// And use the nearest resource scale factor.
	cursor_scale =
	ui::GetScaleForScaleFactor(ui::GetSupportedScaleFactor(original_scale));
	}
	int resource_id;
	// TODO(hshi): support custom cursor set.
	if (!ui::GetCursorDataFor(cursor_set_, cursor_type_, cursor_scale,
	&resource_id, &hot_point_)) {
	return;
	}
	const gfx::ImageSkia* image =
	ResourceBundle::GetSharedInstance().GetImageSkiaNamed(resource_id);
	if (!is_cursor_compositing_enabled_) {
	gfx::ImageSkia rotated = *image;
	switch (display_.rotation()) {
	case display::Display::ROTATE_0:
	break;
	case display::Display::ROTATE_90:
	rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
	*image, SkBitmapOperations::ROTATION_90_CW);
	hot_point_.SetPoint(rotated.width() - hot_point_.y(), hot_point_.x());
	break;
	case display::Display::ROTATE_180:
	rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
	*image, SkBitmapOperations::ROTATION_180_CW);
	hot_point_.SetPoint(rotated.height() - hot_point_.x(),
	rotated.width() - hot_point_.y());
	break;
	case display::Display::ROTATE_270:
	rotated = gfx::ImageSkiaOperations::CreateRotatedImage(
	*image, SkBitmapOperations::ROTATION_270_CW);
	hot_point_.SetPoint(hot_point_.y(), rotated.height() - hot_point_.x());
	break;
	}
	// Note that mirror window's scale factor is always 1.0f, therefore we
	// need to take 2x's image and paint as if it's 1x image.
	const gfx::ImageSkiaRep& image_rep =
	rotated.GetRepresentation(cursor_scale);
	delegate_->SetCursorImage(
	image_rep.pixel_size(),
	gfx::ImageSkia::CreateFrom1xBitmap(image_rep.sk_bitmap()));
	} else {
	const gfx::ImageSkiaRep& image_rep = image->GetRepresentation(cursor_scale);
	delegate_->SetCursorImage(
	image->size(),
	gfx::ImageSkia(gfx::ImageSkiaRep(image_rep.sk_bitmap(), cursor_scale)));
	hot_point_ = gfx::ConvertPointToDIP(cursor_scale, hot_point_);
	}
	if (cursor_window_) {
	cursor_window_->SetBounds(gfx::Rect(delegate_->size()));
	cursor_window_->SchedulePaintInRect(
	gfx::Rect(cursor_window_->bounds().size()));
	UpdateLocation();
	}
	}

	void CursorWindowController::UpdateCursorVisibility() {
	if (!cursor_window_)
	return;
	bool visible = (visible_ && cursor_type_ != ui::kCursorNone);
	if (visible)
	cursor_window_->Show();
	else
	cursor_window_->Hide();
	}

	const gfx::ImageSkia& CursorWindowController::GetCursorImageForTest() const {
	return delegate_->cursor_image();
	}

	} // namespace ash