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/*
* Copyright (C) 2013 The CyanogenMod 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 org.cyanogenmod.wallpapers.photophase.widgets;
import android.content.Context;
import android.graphics.Rect;
import android.os.AsyncTask.Status;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.ViewGroup;
import android.widget.HorizontalScrollView;
import android.widget.ImageView;
import org.cyanogenmod.wallpapers.photophase.R;
import org.cyanogenmod.wallpapers.photophase.tasks.AsyncPictureLoaderTask;
import java.io.File;
import java.util.HashMap;
import java.util.Iterator;
/**
* A view that contains all the pictures of an album
*/
public class PicturesView extends HorizontalScrollView {
private HashMap<File, AsyncPictureLoaderTask> mTasks;
private Handler mHandler;
/**
* Constructor of <code>PicturesView</code>.
*
* @param context The current context
*/
public PicturesView(Context context) {
super(context);
init();
}
/**
* Constructor of <code>PicturesView</code>.
*
* @param context The current context
* @param attrs The attributes of the XML tag that is inflating the view.
*/
public PicturesView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
/**
* Constructor of <code>PicturesView</code>.
*
* @param context The current context
* @param attrs The attributes of the XML tag that is inflating the view.
* @param defStyle The default style to apply to this view. If 0, no style
* will be applied (beyond what is included in the theme). This may
* either be an attribute resource, whose value will be retrieved
* from the current theme, or an explicit style resource.
*/
public PicturesView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
/**
* Method that initializes the structures of this class
*/
private void init() {
mTasks = new HashMap<File, AsyncPictureLoaderTask>();
mHandler = new Handler();
}
/**
* {@inheritDoc}
*/
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
cancelTasks();
}
/**
* Method that removes all tasks
*/
public void cancelTasks() {
// Cancel all the pending task
Iterator<AsyncPictureLoaderTask> it = mTasks.values().iterator();
while (it.hasNext()) {
AsyncPictureLoaderTask task = it.next();
if (task.getStatus().compareTo(Status.PENDING) == 0) {
task.cancel(true);
}
}
mTasks.clear();
}
/**
* {@inheritDoc}
*/
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
// Estimated velocity (in some moment we must obtain some scrolling with an estimated
// velocity below of 3)
int velocity = Math.abs(l - oldl);
if (velocity <= 3) {
mHandler.post(new Runnable() {
@Override
public void run() {
requestLoadOfPendingPictures();
}
});
}
}
/**
* Method invoked when the view is displayed
*/
public void onShow() {
mHandler.post(new Runnable() {
@Override
public void run() {
requestLoadOfPendingPictures();
}
});
}
/**
* Method that load in background all visible and pending pictures
*/
/*package*/ void requestLoadOfPendingPictures() {
// Get the visible rect
Rect r = new Rect();
getHitRect(r);
// Get all the image views
ViewGroup vg = (ViewGroup)getChildAt(0);
int count = vg.getChildCount();
for (int i = 0; i < count; i++) {
ViewGroup picView = (ViewGroup)vg.getChildAt(i);
File image = new File((String)picView.getTag());
if (picView.getLocalVisibleRect(r) && !mTasks.containsKey(image)) {
ImageView iv = (ImageView)picView.findViewById(R.id.picture_thumbnail);
AsyncPictureLoaderTask task = new AsyncPictureLoaderTask(getContext(), iv);
task.execute(image);
mTasks.put(image, task);
}
}
}
}
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