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// Copyright 2015 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/controls/menu/menu_key_event_handler.h"
#include "ui/aura/env.h"
#include "ui/views/controls/menu/menu_controller.h"
#include "ui/views/views_delegate.h"
namespace views {
namespace {
const int kKeyFlagsMask = ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN;
} // namespace
MenuKeyEventHandler::MenuKeyEventHandler() {
aura::Env::GetInstanceDontCreate()->PrependPreTargetHandler(this);
}
MenuKeyEventHandler::~MenuKeyEventHandler() {
aura::Env::GetInstanceDontCreate()->RemovePreTargetHandler(this);
}
void MenuKeyEventHandler::OnKeyEvent(ui::KeyEvent* event) {
MenuController* menu_controller = MenuController::GetActiveInstance();
DCHECK(menu_controller);
if (menu_controller->exit_type() == MenuController::EXIT_ALL ||
menu_controller->exit_type() == MenuController::EXIT_DESTROYED) {
// If the event has arrived after the menu's exit type had changed but
// before its message loop terminated, the event will continue its normal
// propagation for the following reason:
// If the user accepts a menu item in a nested menu, the menu item action is
// run after the base::RunLoop for the innermost menu has quit but before
// the base::RunLoop for the outermost menu has quit. If the menu item
// action starts a base::RunLoop, the outermost menu's base::RunLoop will
// not quit till the action's base::RunLoop ends. IDC_BOOKMARK_BAR_OPEN_ALL
// sometimes opens a modal dialog. The modal dialog starts a base::RunLoop
// and keeps the base::RunLoop running for the duration of its lifetime.
menu_controller->TerminateNestedMessageLoopIfNecessary();
return;
}
event->StopPropagation();
if (event->type() == ui::ET_KEY_PRESSED) {
menu_controller->OnKeyDown(event->key_code());
// Menu controller might have been deleted.
if (!MenuController::GetActiveInstance())
return;
// Do not check mnemonics if the Alt or Ctrl modifiers are pressed. For
// example Ctrl+<T> is an accelerator, but <T> only is a mnemonic.
const int flags = event->flags();
if (menu_controller->exit_type() == MenuController::EXIT_NONE &&
(flags & kKeyFlagsMask) == 0) {
base::char16 c = event->GetCharacter();
menu_controller->SelectByChar(c);
// Menu controller might have been deleted.
if (!MenuController::GetActiveInstance())
return;
}
}
if (!menu_controller->TerminateNestedMessageLoopIfNecessary()) {
ui::Accelerator accelerator(*event);
ViewsDelegate::ProcessMenuAcceleratorResult result =
ViewsDelegate::GetInstance()->ProcessAcceleratorWhileMenuShowing(
accelerator);
if (result == ViewsDelegate::ProcessMenuAcceleratorResult::CLOSE_MENU)
menu_controller->CancelAll();
}
}
} // namespace views
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