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/*
* Copyright (C) 2012 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 com.android.gallery3d.ui;
import android.content.Context;
import android.graphics.Rect;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.MeasureSpec;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.view.ViewTreeObserver.OnGlobalLayoutListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;
import com.android.gallery3d.R;
import java.util.ArrayList;
public class PopupList {
public static interface OnPopupItemClickListener {
public boolean onPopupItemClick(int itemId);
}
public static class Item {
public final int id;
public String title;
public Item(int id, String title) {
this.id = id;
this.title = title;
}
public void setTitle(String title) {
this.title = title;
}
}
private final Context mContext;
private final View mAnchorView;
private final ArrayList<Item> mItems = new ArrayList<Item>();
private PopupWindow mPopupWindow;
private ListView mContentList;
private OnPopupItemClickListener mOnPopupItemClickListener;
private int mPopupOffsetX;
private int mPopupOffsetY;
private int mPopupWidth;
private int mPopupHeight;
public PopupList(Context context, View anchorView) {
mContext = context;
mAnchorView = anchorView;
}
public void setOnPopupItemClickListener(OnPopupItemClickListener listener) {
mOnPopupItemClickListener = listener;
}
public void addItem(int id, String title) {
mItems.add(new Item(id, title));
}
public void clearItems() {
mItems.clear();
}
private final PopupWindow.OnDismissListener mOnDismissListener =
new PopupWindow.OnDismissListener() {
@SuppressWarnings("deprecation")
@Override
public void onDismiss() {
if (mPopupWindow == null) return;
mPopupWindow = null;
ViewTreeObserver observer = mAnchorView.getViewTreeObserver();
if (observer.isAlive()) {
// We used the deprecated function for backward compatibility
// The new "removeOnGlobalLayoutListener" is introduced in API level 16
observer.removeGlobalOnLayoutListener(mOnGLobalLayoutListener);
}
}
};
private final OnItemClickListener mOnItemClickListener =
new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (mPopupWindow == null) return;
mPopupWindow.dismiss();
if (mOnPopupItemClickListener != null) {
mOnPopupItemClickListener.onPopupItemClick((int) id);
}
}
};
private final OnGlobalLayoutListener mOnGLobalLayoutListener =
new OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (mPopupWindow == null) return;
updatePopupLayoutParams();
// Need to update the position of the popup window
mPopupWindow.update(mAnchorView,
mPopupOffsetX, mPopupOffsetY, mPopupWidth, mPopupHeight);
}
};
public void show() {
if (mPopupWindow != null) return;
mAnchorView.getViewTreeObserver()
.addOnGlobalLayoutListener(mOnGLobalLayoutListener);
mPopupWindow = createPopupWindow();
updatePopupLayoutParams();
mPopupWindow.setWidth(mPopupWidth);
mPopupWindow.setHeight(mPopupHeight);
mPopupWindow.showAsDropDown(mAnchorView, mPopupOffsetX, mPopupOffsetY);
}
private void updatePopupLayoutParams() {
ListView content = mContentList;
PopupWindow popup = mPopupWindow;
Rect p = new Rect();
popup.getBackground().getPadding(p);
int maxHeight = mPopupWindow.getMaxAvailableHeight(mAnchorView) - p.top - p.bottom;
mContentList.measure(
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.AT_MOST));
mPopupWidth = content.getMeasuredWidth() + p.top + p.bottom;
mPopupHeight = Math.min(maxHeight, content.getMeasuredHeight() + p.left + p.right);
mPopupOffsetX = -p.left;
mPopupOffsetY = -p.top;
}
private PopupWindow createPopupWindow() {
PopupWindow popup = new PopupWindow(mContext);
popup.setOnDismissListener(mOnDismissListener);
popup.setBackgroundDrawable(mContext.getResources().getDrawable(
R.drawable.menu_dropdown_panel_holo_dark));
mContentList = new ListView(mContext);
mContentList.setAdapter(new ItemDataAdapter());
mContentList.setOnItemClickListener(mOnItemClickListener);
popup.setContentView(mContentList);
popup.setFocusable(true);
popup.setOutsideTouchable(true);
return popup;
}
public Item findItem(int id) {
for (Item item : mItems) {
if (item.id == id) return item;
}
return null;
}
private class ItemDataAdapter extends BaseAdapter {
@Override
public int getCount() {
return mItems.size();
}
@Override
public Object getItem(int position) {
return mItems.get(position);
}
@Override
public long getItemId(int position) {
return mItems.get(position).id;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = LayoutInflater.from(mContext)
.inflate(R.layout.popup_list_item, null);
}
TextView text = (TextView) convertView.findViewById(android.R.id.text1);
text.setText(mItems.get(position).title);
return convertView;
}
}
}
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