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Diffstat (limited to 'src/org/cyanogenmod/wallpapers/photophase/widgets/PicturesView.java')
-rw-r--r-- | src/org/cyanogenmod/wallpapers/photophase/widgets/PicturesView.java | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/org/cyanogenmod/wallpapers/photophase/widgets/PicturesView.java b/src/org/cyanogenmod/wallpapers/photophase/widgets/PicturesView.java new file mode 100644 index 0000000..0744751 --- /dev/null +++ b/src/org/cyanogenmod/wallpapers/photophase/widgets/PicturesView.java @@ -0,0 +1,164 @@ +/* + * 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); + } + } + } +} |