/*
* Copyright (C) 2014 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.support.v7.widget;
import android.content.Context;
import android.support.annotation.MenuRes;
import android.support.v7.appcompat.R;
import android.support.v7.internal.view.SupportMenuInflater;
import android.support.v7.internal.view.menu.MenuBuilder;
import android.support.v7.internal.view.menu.MenuPopupHelper;
import android.support.v7.internal.view.menu.MenuPresenter;
import android.support.v7.internal.view.menu.SubMenuBuilder;
import android.view.Gravity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
/**
* Static library support version of the framework's {@link android.widget.PopupMenu}.
* Used to write apps that run on platforms prior to Android 3.0. When running
* on Android 3.0 or above, this implementation is still used; it does not try
* to switch to the framework's implementation. See the framework SDK
* documentation for a class overview.
*/
public class PopupMenu implements MenuBuilder.Callback, MenuPresenter.Callback {
private Context mContext;
private MenuBuilder mMenu;
private View mAnchor;
private MenuPopupHelper mPopup;
private OnMenuItemClickListener mMenuItemClickListener;
private OnDismissListener mDismissListener;
private View.OnTouchListener mDragListener;
/**
* Callback interface used to notify the application that the menu has closed.
*/
public interface OnDismissListener {
/**
* Called when the associated menu has been dismissed.
*
* @param menu The PopupMenu that was dismissed.
*/
public void onDismiss(PopupMenu menu);
}
/**
* Construct a new PopupMenu.
*
* @param context Context for the PopupMenu.
* @param anchor Anchor view for this popup. The popup will appear below the anchor if there
* is room, or above it if there is not.
*/
public PopupMenu(Context context, View anchor) {
this(context, anchor, Gravity.NO_GRAVITY);
}
/**
* Constructor to create a new popup menu with an anchor view and alignment
* gravity.
*
* @param context Context the popup menu is running in, through which it
* can access the current theme, resources, etc.
* @param anchor Anchor view for this popup. The popup will appear below
* the anchor if there is room, or above it if there is not.
* @param gravity The {@link Gravity} value for aligning the popup with its
* anchor.
*/
public PopupMenu(Context context, View anchor, int gravity) {
this(context, anchor, gravity, R.attr.popupMenuStyle, 0);
}
/**
* Constructor a create a new popup menu with a specific style.
*
* @param context Context the popup menu is running in, through which it
* can access the current theme, resources, etc.
* @param anchor Anchor view for this popup. The popup will appear below
* the anchor if there is room, or above it if there is not.
* @param gravity The {@link Gravity} value for aligning the popup with its
* anchor.
* @param popupStyleAttr An attribute in the current theme that contains a
* reference to a style resource that supplies default values for
* the popup window. Can be 0 to not look for defaults.
* @param popupStyleRes A resource identifier of a style resource that
* supplies default values for the popup window, used only if
* popupStyleAttr is 0 or can not be found in the theme. Can be 0
* to not look for defaults.
*/
public PopupMenu(Context context, View anchor, int gravity, int popupStyleAttr,
int popupStyleRes) {
mContext = context;
mMenu = new MenuBuilder(context);
mMenu.setCallback(this);
mAnchor = anchor;
mPopup = new MenuPopupHelper(context, mMenu, anchor, false, popupStyleAttr, popupStyleRes);
mPopup.setGravity(gravity);
mPopup.setCallback(this);
}
/**
* Returns an {@link android.view.View.OnTouchListener} that can be added to the anchor view
* to implement drag-to-open behavior.
* <p>
* When the listener is set on a view, touching that view and dragging
* outside of its bounds will open the popup window. Lifting will select the
* currently touched list item.
* <p>
* Example usage:
* <pre>
* PopupMenu myPopup = new PopupMenu(context, myAnchor);
* myAnchor.setOnTouchListener(myPopup.getDragToOpenListener());
* </pre>
*
* @return a touch listener that controls drag-to-open behavior
*/
public View.OnTouchListener getDragToOpenListener() {
if (mDragListener == null) {
mDragListener = new ListPopupWindow.ForwardingListener(mAnchor) {
@Override
protected boolean onForwardingStarted() {
show();
return true;
}
@Override
protected boolean onForwardingStopped() {
dismiss();
return true;
}
@Override
public ListPopupWindow getPopup() {
// This will be null until show() is called.
return mPopup.getPopup();
}
};
}
return mDragListener;
}
/**
* @return the {@link Menu} associated with this popup. Populate the returned Menu with
* items before calling {@link #show()}.
*
* @see #show()
* @see #getMenuInflater()
*/
public Menu getMenu() {
return mMenu;
}
/**
* @return a {@link MenuInflater} that can be used to inflate menu items from XML into the
* menu returned by {@link #getMenu()}.
*
* @see #getMenu()
*/
public MenuInflater getMenuInflater() {
return new SupportMenuInflater(mContext);
}
/**
* Inflate a menu resource into this PopupMenu. This is equivalent to calling
* popupMenu.getMenuInflater().inflate(menuRes, popupMenu.getMenu()).
* @param menuRes Menu resource to inflate
*/
public void inflate(@MenuRes int menuRes) {
getMenuInflater().inflate(menuRes, mMenu);
}
/**
* Show the menu popup anchored to the view specified during construction.
* @see #dismiss()
*/
public void show() {
mPopup.show();
}
/**
* Dismiss the menu popup.
* @see #show()
*/
public void dismiss() {
mPopup.dismiss();
}
/**
* Set a listener that will be notified when the user selects an item from the menu.
*
* @param listener Listener to notify
*/
public void setOnMenuItemClickListener(OnMenuItemClickListener listener) {
mMenuItemClickListener = listener;
}
/**
* Set a listener that will be notified when this menu is dismissed.
*
* @param listener Listener to notify
*/
public void setOnDismissListener(OnDismissListener listener) {
mDismissListener = listener;
}
/**
* @hide
*/
public boolean onMenuItemSelected(MenuBuilder menu, MenuItem item) {
if (mMenuItemClickListener != null) {
return mMenuItemClickListener.onMenuItemClick(item);
}
return false;
}
/**
* @hide
*/
public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) {
if (mDismissListener != null) {
mDismissListener.onDismiss(this);
}
}
/**
* @hide
*/
public boolean onOpenSubMenu(MenuBuilder subMenu) {
if (subMenu == null) return false;
if (!subMenu.hasVisibleItems()) {
return true;
}
// Current menu will be dismissed by the normal helper, submenu will be shown in its place.
new MenuPopupHelper(mContext, subMenu, mAnchor).show();
return true;
}
/**
* @hide
*/
public void onCloseSubMenu(SubMenuBuilder menu) {
}
/**
* @hide
*/
public void onMenuModeChange(MenuBuilder menu) {
}
/**
* Interface responsible for receiving menu item click events if the items themselves
* do not have individual item click listeners.
*/
public interface OnMenuItemClickListener {
/**
* This method will be invoked when a menu item is clicked if the item itself did
* not already handle the event.
*
* @param item {@link MenuItem} that was clicked
* @return <code>true</code> if the event was handled, <code>false</code> otherwise.
*/
public boolean onMenuItemClick(MenuItem item);
}
} |
