Implement cursor changing on Mushrome

ash/wm/ash_native_cursor_manager.cc

-// Copyright (c) 2012 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/wm/ash_native_cursor_manager.h"
-
-#include "ash/display/cursor_window_controller.h"
-#include "ash/display/window_tree_host_manager.h"
-#include "ash/shell.h"
-#include "base/logging.h"
-#include "ui/aura/env.h"
-#include "ui/aura/window_event_dispatcher.h"
-#include "ui/aura/window_tree_host.h"
-#include "ui/base/cursor/cursor.h"
-#include "ui/base/cursor/image_cursors.h"
-#include "ui/base/layout.h"
-
-namespace ash {
-namespace {
-
-void SetCursorOnAllRootWindows(gfx::NativeCursor cursor) {
-  aura::Window::Windows root_windows = Shell::Get()->GetAllRootWindows();
-  for (aura::Window::Windows::iterator iter = root_windows.begin();
-       iter != root_windows.end(); ++iter)
-    (*iter)->GetHost()->SetCursor(cursor);
-
-  Shell::Get()
-      ->window_tree_host_manager()
-      ->cursor_window_controller()
-      ->SetCursor(cursor);
-}
-
-void NotifyCursorVisibilityChange(bool visible) {
-  aura::Window::Windows root_windows = Shell::Get()->GetAllRootWindows();
-  for (aura::Window::Windows::iterator iter = root_windows.begin();
-       iter != root_windows.end(); ++iter)
-    (*iter)->GetHost()->OnCursorVisibilityChanged(visible);
-
-  Shell::Get()
-      ->window_tree_host_manager()
-      ->cursor_window_controller()
-      ->SetVisibility(visible);
-}
-
-void NotifyMouseEventsEnableStateChange(bool enabled) {
-  aura::Window::Windows root_windows = Shell::Get()->GetAllRootWindows();
-  for (aura::Window::Windows::iterator iter = root_windows.begin();
-       iter != root_windows.end(); ++iter)
-    (*iter)->GetHost()->dispatcher()->OnMouseEventsEnableStateChanged(enabled);
-  // Mirror window never process events.
-}
-
-}  // namespace
-
-AshNativeCursorManager::AshNativeCursorManager()
-    : native_cursor_enabled_(true), image_cursors_(new ui::ImageCursors) {}
-
-AshNativeCursorManager::~AshNativeCursorManager() {}
-
-void AshNativeCursorManager::SetNativeCursorEnabled(bool enabled) {
-  native_cursor_enabled_ = enabled;
-
-  ::wm::CursorManager* cursor_manager = Shell::Get()->cursor_manager();
-  SetCursor(cursor_manager->GetCursor(), cursor_manager);
-}
-
-void AshNativeCursorManager::SetDisplay(
-    const display::Display& display,
-    ::wm::NativeCursorManagerDelegate* delegate) {
-  DCHECK(display.is_valid());
-  // Use the platform's device scale factor instead of the display's, which
-  // might have been adjusted for the UI scale.
-  const float original_scale = Shell::Get()
-                                   ->display_manager()
-                                   ->GetDisplayInfo(display.id())
-                                   .device_scale_factor();
-  // And use the nearest resource scale factor.
-  const float cursor_scale =
-      ui::GetScaleForScaleFactor(ui::GetSupportedScaleFactor(original_scale));
-
-  if (image_cursors_->SetDisplay(display, cursor_scale))
-    SetCursor(delegate->GetCursor(), delegate);
-
-  Shell::Get()
-      ->window_tree_host_manager()
-      ->cursor_window_controller()
-      ->SetDisplay(display);
-}
-
-void AshNativeCursorManager::SetCursor(
-    gfx::NativeCursor cursor,
-    ::wm::NativeCursorManagerDelegate* delegate) {
-  if (native_cursor_enabled_) {
-    image_cursors_->SetPlatformCursor(&cursor);
-  } else {
-    gfx::NativeCursor invisible_cursor(ui::CursorType::kNone);
-    image_cursors_->SetPlatformCursor(&invisible_cursor);
-    if (cursor == ui::CursorType::kCustom) {
-      // Fall back to the default pointer cursor for now. (crbug.com/476078)
-      // TODO(oshima): support custom cursor.
-      cursor = ui::CursorType::kPointer;
-    } else {
-      cursor.SetPlatformCursor(invisible_cursor.platform());
-    }
-  }
-  cursor.set_device_scale_factor(image_cursors_->GetScale());
-
-  delegate->CommitCursor(cursor);
-
-  if (delegate->IsCursorVisible())
-    SetCursorOnAllRootWindows(cursor);
-}
-
-void AshNativeCursorManager::SetCursorSet(
-    ui::CursorSetType cursor_set,
-    ::wm::NativeCursorManagerDelegate* delegate) {
-  image_cursors_->SetCursorSet(cursor_set);
-  delegate->CommitCursorSet(cursor_set);
-
-  // Sets the cursor to reflect the scale change immediately.
-  if (delegate->IsCursorVisible())
-    SetCursor(delegate->GetCursor(), delegate);
-
-  Shell::Get()
-      ->window_tree_host_manager()
-      ->cursor_window_controller()
-      ->SetCursorSet(cursor_set);
-}
-
-void AshNativeCursorManager::SetVisibility(
-    bool visible,
-    ::wm::NativeCursorManagerDelegate* delegate) {
-  delegate->CommitVisibility(visible);
-
-  if (visible) {
-    SetCursor(delegate->GetCursor(), delegate);
-  } else {
-    gfx::NativeCursor invisible_cursor(ui::CursorType::kNone);
-    image_cursors_->SetPlatformCursor(&invisible_cursor);
-    SetCursorOnAllRootWindows(invisible_cursor);
-  }
-
-  NotifyCursorVisibilityChange(visible);
-}
-
-void AshNativeCursorManager::SetMouseEventsEnabled(
-    bool enabled,
-    ::wm::NativeCursorManagerDelegate* delegate) {
-  delegate->CommitMouseEventsEnabled(enabled);
-
-  if (enabled) {
-    aura::Env::GetInstance()->set_last_mouse_location(
-        disabled_cursor_location_);
-  } else {
-    disabled_cursor_location_ = aura::Env::GetInstance()->last_mouse_location();
-  }
-
-  SetVisibility(delegate->IsCursorVisible(), delegate);
-  NotifyMouseEventsEnableStateChange(enabled);
-}
-
-}  // namespace ash