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

ui/views/corewm/cursor_manager.cc

+// 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 "ui/views/corewm/cursor_manager.h"
+
+#include "base/logging.h"
+#include "ui/views/corewm/native_cursor_manager.h"
+#include "ui/views/corewm/native_cursor_manager_delegate.h"
+
+namespace views {
+namespace corewm {
+
+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(scoped_ptr<NativeCursorManager> delegate)
+    : delegate_(delegate.Pass()),
+      cursor_lock_count_(0),
+      current_state_(new internal::CursorState),
+      state_on_unlock_(new internal::CursorState) {
+}
+
+CursorManager::~CursorManager() {
+}
+
+void CursorManager::SetCursor(gfx::NativeCursor cursor) {
+  state_on_unlock_->set_cursor(cursor);
+  if (cursor_lock_count_ == 0 &&
+      GetCurrentCursor() != state_on_unlock_->cursor()) {
+    delegate_->SetCursor(state_on_unlock_->cursor(), this);
+  }
+}
+
+void CursorManager::ShowCursor() {
+  state_on_unlock_->SetVisible(true);
+  if (cursor_lock_count_ == 0 &&
+      IsCursorVisible() != state_on_unlock_->visible()) {
+    delegate_->SetVisibility(state_on_unlock_->visible(), this);
+  }
+}
+
+void CursorManager::HideCursor() {
+  state_on_unlock_->SetVisible(false);
+  if (cursor_lock_count_ == 0 &&
+      IsCursorVisible() != state_on_unlock_->visible()) {
+    delegate_->SetVisibility(state_on_unlock_->visible(), this);
+  }
+}
+
+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()) {
+    delegate_->SetMouseEventsEnabled(state_on_unlock_->mouse_events_enabled(),
+                                     this);
+  }
+}
+
+void CursorManager::DisableMouseEvents() {
+  state_on_unlock_->SetMouseEventsEnabled(false);
+  if (cursor_lock_count_ == 0 &&
+      IsMouseEventsEnabled() != state_on_unlock_->mouse_events_enabled()) {
+    delegate_->SetMouseEventsEnabled(state_on_unlock_->mouse_events_enabled(),
+                                     this);
+  }
+}
+
+bool CursorManager::IsMouseEventsEnabled() const {
+  return current_state_->mouse_events_enabled();
+}
+
+void CursorManager::SetDeviceScaleFactor(float device_scale_factor) {
+  delegate_->SetDeviceScaleFactor(device_scale_factor, this);
+}
+
+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()) {
+    delegate_->SetCursor(state_on_unlock_->cursor(), this);
+  }
+  if (IsMouseEventsEnabled() != state_on_unlock_->mouse_events_enabled()) {
+    delegate_->SetMouseEventsEnabled(state_on_unlock_->mouse_events_enabled(),
+                                     this);
+  }
+  if (IsCursorVisible() != state_on_unlock_->visible()) {
+    delegate_->SetVisibility(state_on_unlock_->visible(),
+                             this);
+  }
+}
+
+gfx::NativeCursor CursorManager::GetCurrentCursor() const {
+  return current_state_->cursor();
+}
+
+bool CursorManager::GetCurrentVisibility() const {
+  return current_state_->visible();
+}
+
+bool CursorManager::GetMouseEventsEnabled() const {
+  return current_state_->mouse_events_enabled();
+}
+
+void CursorManager::CommitCursor(gfx::NativeCursor cursor) {
+  current_state_->set_cursor(cursor);
+}
+
+void CursorManager::CommitVisibility(bool visible) {
+  current_state_->SetVisible(visible);
+}
+
+void CursorManager::CommitMouseEventsEnabled(bool enabled) {
+  current_state_->SetMouseEventsEnabled(enabled);
+}
+
+}  // namespace corewm
+}  // namespace views