QuickActionMenu.java

/*
    Copyright (C) 2014 Prasanna Thirumalai
    
    This file is part of StackX.

    StackX is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    StackX is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with StackX.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.prasanna.android.views;

import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.PopupWindow.OnDismissListener;
import android.widget.TextView;

import com.prasanna.android.stacknetwork.R;

public class QuickActionMenu {
  private final Context context;
  private ListView listView;
  private ActionItemAdapter actionItemAdapter;
  private PopupWindow popupWindow;
  private View rootView;

  private class ActionItemAdapter extends ArrayAdapter<QuickActionItem> {
    public ActionItemAdapter(Context context, int textViewResourceId) {
      super(context, textViewResourceId);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      TextView view = (TextView) LayoutInflater.from(getContext()).inflate(R.layout.quick_action_item, null);
      view.setText(getItem(position).getTitle());
      return view;
    }
  }

  public QuickActionMenu(Context context) {
    this.context = context;

    rootView = initPopupWindow();
    setupPopupWindowView();
  }

  private View initPopupWindow() {
    View v = LayoutInflater.from(context).inflate(R.layout.quick_action_popup, null);
    popupWindow = new PopupWindow(context);
    popupWindow.setWidth(WindowManager.LayoutParams.WRAP_CONTENT);
    popupWindow.setHeight(WindowManager.LayoutParams.WRAP_CONTENT);
    popupWindow.setTouchable(true);
    popupWindow.setFocusable(true);
    popupWindow.setOutsideTouchable(true);
    popupWindow.setBackgroundDrawable(new BitmapDrawable(context.getResources()));
    popupWindow.setContentView(v);
    return v;
  }

  private void setupPopupWindowView() {
    actionItemAdapter = new ActionItemAdapter(context, R.layout.quick_action_item);
    listView = (ListView) rootView.findViewById(R.id.quickActionItemlist);
    listView.setOnItemClickListener(new OnItemClickListener() {
      @Override
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        actionItemAdapter.getItem(position).getOnClickListener().onClick(view);
        dismiss();
      }
    });
    listView.setAdapter(actionItemAdapter);
  }

  public void addActionItem(QuickActionItem quickActionItem) {
    actionItemAdapter.add(quickActionItem);
    actionItemAdapter.notifyDataSetChanged();
  }

  public void removeActionItem(QuickActionItem quickActionItem) {
    actionItemAdapter.remove(quickActionItem);
    actionItemAdapter.notifyDataSetChanged();
  }

  public void show(View anchor) {
    int[] anchorLocation = new int[2];
    int screenHeight = context.getResources().getDisplayMetrics().heightPixels;
    anchor.getLocationOnScreen(anchorLocation);

    if (anchorLocation[1] > (screenHeight / 2 + 150)) popupWindow.showAtLocation(anchor, Gravity.NO_GRAVITY,
        anchorLocation[0], anchorLocation[1] - rootView.getHeight());
    else popupWindow.showAsDropDown(anchor);
  }

  public void setOnDismissListener(OnDismissListener onDismissListener) {
    popupWindow.setOnDismissListener(onDismissListener);
  }

  public void dismiss() {
    popupWindow.dismiss();
  }
}