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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
package android.widget;
import android.annotation.NonNull;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.transition.Transition;
import android.util.AttributeSet;
import android.view.KeyEvent;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import com.android.internal.view.menu.ListMenuItemView;
import com.android.internal.view.menu.MenuAdapter;
import com.android.internal.view.menu.MenuBuilder;
/**
* A MenuPopupWindow represents the popup window for menu.
*
* MenuPopupWindow is mostly same as ListPopupWindow, but it has customized
* behaviors specific to menus,
*
* @hide
*/
public class MenuPopupWindow extends ListPopupWindow implements MenuItemHoverListener {
private MenuItemHoverListener mHoverListener;
public MenuPopupWindow(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
DropDownListView createDropDownListView(Context context, boolean hijackFocus) {
MenuDropDownListView view = new MenuDropDownListView(context, hijackFocus);
view.setHoverListener(this);
return view;
}
public void setEnterTransition(Transition enterTransition) {
mPopup.setEnterTransition(enterTransition);
}
public void setExitTransition(Transition exitTransition) {
mPopup.setExitTransition(exitTransition);
}
public void setHoverListener(MenuItemHoverListener hoverListener) {
mHoverListener = hoverListener;
}
/**
* Set whether this window is touch modal or if outside touches will be sent to
* other windows behind it.
*/
public void setTouchModal(boolean touchModal) {
mPopup.setTouchModal(touchModal);
}
@Override
public void onItemHoverEnter(@NonNull MenuBuilder menu, @NonNull MenuItem item) {
// Forward up the chain
if (mHoverListener != null) {
mHoverListener.onItemHoverEnter(menu, item);
}
}
@Override
public void onItemHoverExit(@NonNull MenuBuilder menu, @NonNull MenuItem item) {
// Forward up the chain
if (mHoverListener != null) {
mHoverListener.onItemHoverExit(menu, item);
}
}
/**
* @hide
*/
public static class MenuDropDownListView extends DropDownListView {
final int mAdvanceKey;
final int mRetreatKey;
private MenuItemHoverListener mHoverListener;
private MenuItem mHoveredMenuItem;
public MenuDropDownListView(Context context, boolean hijackFocus) {
super(context, hijackFocus);
final Resources res = context.getResources();
final Configuration config = res.getConfiguration();
if (config.getLayoutDirection() == View.LAYOUT_DIRECTION_RTL) {
mAdvanceKey = KeyEvent.KEYCODE_DPAD_LEFT;
mRetreatKey = KeyEvent.KEYCODE_DPAD_RIGHT;
} else {
mAdvanceKey = KeyEvent.KEYCODE_DPAD_RIGHT;
mRetreatKey = KeyEvent.KEYCODE_DPAD_LEFT;
}
}
public void setHoverListener(MenuItemHoverListener hoverListener) {
mHoverListener = hoverListener;
}
public void clearSelection() {
setSelectedPositionInt(INVALID_POSITION);
setNextSelectedPositionInt(INVALID_POSITION);
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
ListMenuItemView selectedItem = (ListMenuItemView) getSelectedView();
if (selectedItem != null && keyCode == mAdvanceKey) {
if (selectedItem.isEnabled() && selectedItem.getItemData().hasSubMenu()) {
performItemClick(
selectedItem,
getSelectedItemPosition(),
getSelectedItemId());
}
return true;
} else if (selectedItem != null && keyCode == mRetreatKey) {
setSelectedPositionInt(INVALID_POSITION);
setNextSelectedPositionInt(INVALID_POSITION);
// Close only the top-level menu.
((MenuAdapter) getAdapter()).getAdapterMenu().close(false /* closeAllMenus */);
return true;
}
return super.onKeyDown(keyCode, event);
}
@Override
public boolean onHoverEvent(MotionEvent ev) {
// Dispatch any changes in hovered item index to the listener.
if (mHoverListener != null) {
// The adapter may be wrapped. Adjust the index if necessary.
final int headersCount;
final MenuAdapter menuAdapter;
final ListAdapter adapter = getAdapter();
if (adapter instanceof HeaderViewListAdapter) {
final HeaderViewListAdapter headerAdapter = (HeaderViewListAdapter) adapter;
headersCount = headerAdapter.getHeadersCount();
menuAdapter = (MenuAdapter) headerAdapter.getWrappedAdapter();
} else {
headersCount = 0;
menuAdapter = (MenuAdapter) adapter;
}
// Find the menu item for the view at the event coordinates.
MenuItem menuItem = null;
if (ev.getAction() != MotionEvent.ACTION_HOVER_EXIT) {
final int position = pointToPosition((int) ev.getX(), (int) ev.getY());
if (position != INVALID_POSITION) {
final int itemPosition = position - headersCount;
if (itemPosition >= 0 && itemPosition < menuAdapter.getCount()) {
menuItem = menuAdapter.getItem(itemPosition);
}
}
}
final MenuItem oldMenuItem = mHoveredMenuItem;
if (oldMenuItem != menuItem) {
final MenuBuilder menu = menuAdapter.getAdapterMenu();
if (oldMenuItem != null) {
mHoverListener.onItemHoverExit(menu, oldMenuItem);
}
mHoveredMenuItem = menuItem;
if (menuItem != null) {
mHoverListener.onItemHoverEnter(menu, menuItem);
}
}
}
return super.onHoverEvent(ev);
}
}
}
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