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// Copyright 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.
package org.chromium.chrome.browser.appmenu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import org.chromium.chrome.browser.UmaBridge;
/**
* A helper class for a menu button to decide when to show the app menu and forward touch
* events.
*
* Simply construct this class and pass the class instance to a menu button as TouchListener.
* Then this class will handle everything regarding showing app menu for you.
*/
public class AppMenuButtonHelper implements OnTouchListener {
private final View mMenuButton;
private final AppMenuHandler mMenuHandler;
private Runnable mOnAppMenuShownListener;
/**
* @param menuButton Menu button instance that will trigger the app menu.
* @param menuHandler MenuHandler implementation that can show and get the app menu.
*/
public AppMenuButtonHelper(View menuButton, AppMenuHandler menuHandler) {
mMenuButton = menuButton;
mMenuHandler = menuHandler;
}
/**
* @param onAppMenuShownListener This is called when the app menu is shown by this class.
*/
public void setOnAppMenuShownListener(Runnable onAppMenuShownListener) {
mOnAppMenuShownListener = onAppMenuShownListener;
}
/**
* Shows the app menu if it is not already shown.
* @param startDragging Whether dragging is started.
* @return Whether or not if the app menu is successfully shown.
*/
private boolean showAppMenu(boolean startDragging) {
if (!mMenuHandler.isAppMenuShowing() &&
mMenuHandler.showAppMenu(mMenuButton, false, startDragging)) {
// Initial start dragging can be canceled in case if it was just single tap.
// So we only record non-dragging here, and will deal with those dragging cases in
// AppMenuDragHelper class.
if (!startDragging) UmaBridge.usingMenu(false, false);
if (mOnAppMenuShownListener != null) {
mOnAppMenuShownListener.run();
}
return true;
}
return false;
}
/**
* @return Whether app menu is active. That is, AppMenu is showing or menu button is consuming
* touch events to prepare AppMenu showing.
*/
public boolean isAppMenuActive() {
return mMenuButton.isPressed() || mMenuHandler.isAppMenuShowing();
}
/**
* Handle the key press event on a menu button.
* @return Whether the app menu was shown as a result of this action.
*/
public boolean onEnterKeyPress() {
return showAppMenu(false);
}
@Override
public boolean onTouch(View view, MotionEvent event) {
boolean isTouchEventConsumed = false;
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
isTouchEventConsumed |= true;
mMenuButton.setPressed(true);
showAppMenu(true);
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
isTouchEventConsumed |= true;
mMenuButton.setPressed(false);
break;
default:
}
// If user starts to drag on this menu button, ACTION_DOWN and all the subsequent touch
// events are received here. We need to forward this event to the app menu to handle
// dragging correctly.
AppMenuDragHelper dragHelper = mMenuHandler.getAppMenuDragHelper();
if (dragHelper != null) {
isTouchEventConsumed |= dragHelper.handleDragging(event);
}
return isTouchEventConsumed;
}
}
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