1 files changed, 206 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ui/PopupList.java b/src/com/android/gallery3d/ui/PopupList.java
new file mode 100644
index 000000000..248f50b25
--- /dev/null
+++ b/src/com/android/gallery3d/ui/PopupList.java
@@ -0,0 +1,206 @@
+/*
+ * 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, null,
+                android.R.attr.dropDownListViewStyle);
+        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;
+        }
+    }
+}