Move common accelerator code from ash to ui/wm/core

ui/wm/core/accelerator_filter.cc

Index: ui/wm/core/accelerator_filter.cc
diff --git a/ui/wm/core/accelerator_filter.cc b/ui/wm/core/accelerator_filter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b55147bebf7dfee3a20b78c29a6f1b0ee4dfb3e4
--- /dev/null
+++ b/ui/wm/core/accelerator_filter.cc
@@ -0,0 +1,85 @@
+// 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 "ui/wm/core/accelerator_filter.h"
+
+#include "ui/base/accelerators/accelerator.h"
+#include "ui/events/event.h"
+#include "ui/wm/core/accelerator_delegate.h"
+
+namespace wm {
+namespace {
+
+const int kModifierFlagMask =
+    (ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN);
+
+// Returns true if |key_code| is a key usually handled directly by the shell.
+bool IsSystemKey(ui::KeyboardCode key_code) {
+#if defined(OS_CHROMEOS)
+  switch (key_code) {
+    case ui::VKEY_MEDIA_LAUNCH_APP2:  // Fullscreen button.
+    case ui::VKEY_MEDIA_LAUNCH_APP1:  // Overview button.
+    case ui::VKEY_BRIGHTNESS_DOWN:
+    case ui::VKEY_BRIGHTNESS_UP:
+    case ui::VKEY_KBD_BRIGHTNESS_DOWN:
+    case ui::VKEY_KBD_BRIGHTNESS_UP:
+    case ui::VKEY_VOLUME_MUTE:
+    case ui::VKEY_VOLUME_DOWN:
+    case ui::VKEY_VOLUME_UP:
+      return true;
+    default:
+      return false;
+  }
+#endif  // defined(OS_CHROMEOS)
+  return false;
+}
+
+}  // namespace
+
+////////////////////////////////////////////////////////////////////////////////
+// AcceleratorFilter, public:
+
+AcceleratorFilter::AcceleratorFilter(scoped_ptr<AcceleratorDelegate> delegate)
+    : delegate_(delegate.Pass()) {
+}
+
+AcceleratorFilter::~AcceleratorFilter() {
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AcceleratorFilter, EventFilter implementation:
+
+void AcceleratorFilter::OnKeyEvent(ui::KeyEvent* event) {
+  const ui::EventType type = event->type();
+  if (type != ui::ET_KEY_PRESSED && type != ui::ET_KEY_RELEASED)
+    return;
+  if (event->is_char())
+    return;
+
+  ui::Accelerator accelerator(event->key_code(),
+                              event->flags() & kModifierFlagMask);
+  accelerator.set_type(event->type());
+
+  delegate_->PreProcessAccelerator(accelerator);
+
+  // Handle special hardware keys like brightness and volume. However, some
+  // windows can override this behavior (e.g. Chrome v1 apps by default and
+  // Chrome v2 apps with permission) by setting a window property.
+  if (IsSystemKey(event->key_code()) &&
+      !delegate_->CanConsumeSystemKeys(*event)) {
+    delegate_->ProcessAccelerator(accelerator);
+    // These keys are always consumed regardless of whether they trigger an
+    // accelerator to prevent windows from seeing unexpected key up events.
+    event->StopPropagation();
+    return;
+  }
+
+  if (!delegate_->ShouldProcessAcceleratorNow(*event, accelerator))
+    return;
+
+  if (delegate_->ProcessAccelerator(accelerator))
+    event->StopPropagation();
+}
+
+}  // namespace wm