Picker.java

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// -*- mode: java; c-basic-offset: 2; -*-
// Copyright 2009-2011 Google, All Rights reserved
// Copyright 2011-2012 MIT, All rights reserved
// Released under the Apache License, Version 2.0
// http://www.apache.org/licenses/LICENSE-2.0
 
package com.google.appinventor.components.runtime;
 
import com.google.appinventor.components.annotations.SimpleEvent;
import com.google.appinventor.components.annotations.SimpleFunction;
import com.google.appinventor.components.annotations.SimpleObject;
import com.google.appinventor.components.runtime.util.AnimationUtil;
import android.content.Intent;
 
@SimpleObject
public abstract class Picker extends ButtonBase implements ActivityResultListener {
  protected final ComponentContainer container;
 
  /* Used to identify the call to startActivityForResult. Will be passed back into the
  resultReturned() callback method. */
  protected int requestCode;
 
  public Picker(ComponentContainer container) {
    super(container);
    this.container = container;
  }
 
  protected abstract Intent getIntent();
 
  @Override
  public void click() {
    BeforePicking();
    if (requestCode == 0) { // only need to register once
      requestCode = container.$form().registerForActivityResult(this);
    }
    container.$context().startActivityForResult(getIntent(), requestCode);
    String openAnim = container.$form().getOpenAnimType();
    AnimationUtil.ApplyOpenScreenAnimation(container.$context(), openAnim);
  }
 
  // Functions
 
  @SimpleFunction(description = "Opens the %type%, as though the user clicked on it.")
  public void Open() {
    click();
  }
 
  // Events
 
  @SimpleEvent
  public void BeforePicking() {
    EventDispatcher.dispatchEvent(this, "BeforePicking");
  }
 
  @SimpleEvent
  public void AfterPicking() {
    EventDispatcher.dispatchEvent(this, "AfterPicking");
  }
}