Rework ash::CursorManager into a corewm object, to share code with desktop.

ash/wm/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/cursor_manager.h"
-
-#include "ash/shell.h"
-#include "ash/wm/image_cursors.h"
-#include "base/logging.h"
-#include "ui/aura/env.h"
-#include "ui/aura/root_window.h"
-#include "ui/base/cursor/cursor.h"
-
-namespace  {
-
-// The coordinate of the cursor used when the mouse events are disabled.
-const int kDisabledCursorLocationX = -10000;
-const int kDisabledCursorLocationY = -10000;
-
-void SetCursorOnAllRootWindows(gfx::NativeCursor cursor) {
-  ash::Shell::RootWindowList root_windows =
-      ash::Shell::GetInstance()->GetAllRootWindows();
-  for (ash::Shell::RootWindowList::iterator iter = root_windows.begin();
-       iter != root_windows.end(); ++iter)
-    (*iter)->SetCursor(cursor);
-}
-
-void NotifyCursorVisibilityChange(bool visible) {
-  ash::Shell::RootWindowList root_windows =
-      ash::Shell::GetInstance()->GetAllRootWindows();
-  for (ash::Shell::RootWindowList::iterator iter = root_windows.begin();
-       iter != root_windows.end(); ++iter)
-    (*iter)->OnCursorVisibilityChanged(visible);
-}
-
-void NotifyMouseEventsEnableStateChange(bool enabled) {
-  ash::Shell::RootWindowList root_windows =
-      ash::Shell::GetInstance()->GetAllRootWindows();
-  for (ash::Shell::RootWindowList::iterator iter = root_windows.begin();
-       iter != root_windows.end(); ++iter)
-    (*iter)->OnMouseEventsEnableStateChanged(enabled);
-}
-
-}  // namespace
-
-namespace ash {
-namespace internal {
-
-// Represents the cursor state which is composed of cursor type, visibility, and
-// mouse events enable state. When mouse events are disabled, the cursor is
-// always invisible.
-class CursorState {
- public:
-  CursorState()
-      : cursor_(ui::kCursorNone),
-        visible_(true),
-        mouse_events_enabled_(true),
-        visible_on_mouse_events_enabled_(true) {
-  }
-
-  gfx::NativeCursor cursor() const { return cursor_; }
-  void set_cursor(gfx::NativeCursor cursor) { cursor_ = cursor; }
-
-  bool visible() const { return visible_; }
-  void SetVisible(bool visible) {
-    if (mouse_events_enabled_)
-      visible_ = visible;
-    // Ignores the call when mouse events disabled.
-  }
-
-  bool mouse_events_enabled() const { return mouse_events_enabled_; }
-  void SetMouseEventsEnabled(bool enabled) {
-    if (mouse_events_enabled_ == enabled)
-      return;
-    mouse_events_enabled_ = enabled;
-
-    // Restores the visibility when mouse events are enabled.
-    if (enabled) {
-      visible_ = visible_on_mouse_events_enabled_;
-    } else {
-      visible_on_mouse_events_enabled_ = visible_;
-      visible_ = false;
-    }
-  }
-
- private:
-  gfx::NativeCursor cursor_;
-  bool visible_;
-  bool mouse_events_enabled_;
-
-  // The visibility to set when mouse events are enabled.
-  bool visible_on_mouse_events_enabled_;
-
-  DISALLOW_COPY_AND_ASSIGN(CursorState);
-};
-
-}  // namespace internal
-
-CursorManager::CursorManager()
-    : cursor_lock_count_(0),
-      current_state_(new internal::CursorState),
-      state_on_unlock_(new internal::CursorState),
-      image_cursors_(new ImageCursors) {
-}
-
-CursorManager::~CursorManager() {
-}
-
-void CursorManager::SetCursor(gfx::NativeCursor cursor) {
-  state_on_unlock_->set_cursor(cursor);
-  if (cursor_lock_count_ == 0 &&
-      GetCurrentCursor() != state_on_unlock_->cursor()) {
-    SetCursorInternal(state_on_unlock_->cursor());
-  }
-}
-
-void CursorManager::ShowCursor() {
-  state_on_unlock_->SetVisible(true);
-  if (cursor_lock_count_ == 0 &&
-      IsCursorVisible() != state_on_unlock_->visible()) {
-    SetCursorVisibility(state_on_unlock_->visible());
-  }
-}
-
-void CursorManager::HideCursor() {
-  state_on_unlock_->SetVisible(false);
-  if (cursor_lock_count_ == 0 &&
-      IsCursorVisible() != state_on_unlock_->visible()) {
-    SetCursorVisibility(state_on_unlock_->visible());
-  }
-}
-
-bool CursorManager::IsCursorVisible() const {
-  return current_state_->visible();
-}
-
-void CursorManager::EnableMouseEvents() {
-  state_on_unlock_->SetMouseEventsEnabled(true);
-  if (cursor_lock_count_ == 0 &&
-      IsMouseEventsEnabled() != state_on_unlock_->mouse_events_enabled()) {
-    SetMouseEventsEnabled(state_on_unlock_->mouse_events_enabled());
-  }
-}
-
-void CursorManager::DisableMouseEvents() {
-  state_on_unlock_->SetMouseEventsEnabled(false);
-  if (cursor_lock_count_ == 0 &&
-      IsMouseEventsEnabled() != state_on_unlock_->mouse_events_enabled()) {
-    SetMouseEventsEnabled(state_on_unlock_->mouse_events_enabled());
-  }
-}
-
-bool CursorManager::IsMouseEventsEnabled() const {
-  return current_state_->mouse_events_enabled();
-}
-
-void CursorManager::SetDeviceScaleFactor(float device_scale_factor) {
-  if (image_cursors_->SetDeviceScaleFactor(device_scale_factor))
-    SetCursorInternal(GetCurrentCursor());
-}
-
-void CursorManager::LockCursor() {
-  cursor_lock_count_++;
-}
-
-void CursorManager::UnlockCursor() {
-  cursor_lock_count_--;
-  DCHECK_GE(cursor_lock_count_, 0);
-  if (cursor_lock_count_ > 0)
-    return;
-
-  if (GetCurrentCursor() != state_on_unlock_->cursor())
-    SetCursorInternal(state_on_unlock_->cursor());
-  if (IsMouseEventsEnabled() != state_on_unlock_->mouse_events_enabled())
-    SetMouseEventsEnabled(state_on_unlock_->mouse_events_enabled());
-  if (IsCursorVisible() != state_on_unlock_->visible())
-    SetCursorVisibility(state_on_unlock_->visible());
-}
-
-void CursorManager::SetCursorInternal(gfx::NativeCursor cursor) {
-  gfx::NativeCursor new_cursor = cursor;
-  image_cursors_->SetPlatformCursor(&new_cursor);
-  new_cursor.set_device_scale_factor(image_cursors_->GetDeviceScaleFactor());
-  current_state_->set_cursor(new_cursor);
-
-  if (IsCursorVisible())
-    SetCursorOnAllRootWindows(GetCurrentCursor());
-}
-
-void CursorManager::SetCursorVisibility(bool visible) {
-  current_state_->SetVisible(visible);
-
-  if (visible) {
-    SetCursorInternal(GetCurrentCursor());
-  } else {
-    gfx::NativeCursor invisible_cursor(ui::kCursorNone);
-    image_cursors_->SetPlatformCursor(&invisible_cursor);
-    SetCursorOnAllRootWindows(invisible_cursor);
-  }
-
-  NotifyCursorVisibilityChange(visible);
-}
-
-void CursorManager::SetMouseEventsEnabled(bool enabled) {
-  current_state_->SetMouseEventsEnabled(enabled);
-
-  if (enabled) {
-    aura::Env::GetInstance()->set_last_mouse_location(
-        disabled_cursor_location_);
-  } else {
-    disabled_cursor_location_ = aura::Env::GetInstance()->last_mouse_location();
-    aura::Env::GetInstance()->set_last_mouse_location(
-        gfx::Point(kDisabledCursorLocationX, kDisabledCursorLocationY));
-  }
-
-  SetCursorVisibility(current_state_->visible());
-  NotifyMouseEventsEnableStateChange(enabled);
-}
-
-gfx::NativeCursor CursorManager::GetCurrentCursor() const {
-  return current_state_->cursor();
-}
-
-}  // namespace ash