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Diffstat (limited to 'src/com/android/gallery3d/data/ChangeNotifier.java')
-rw-r--r-- | src/com/android/gallery3d/data/ChangeNotifier.java | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/data/ChangeNotifier.java b/src/com/android/gallery3d/data/ChangeNotifier.java new file mode 100644 index 000000000..e1e601dd6 --- /dev/null +++ b/src/com/android/gallery3d/data/ChangeNotifier.java @@ -0,0 +1,54 @@ +/* + * Copyright (C) 2010 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.data; + +import com.android.gallery3d.app.GalleryApp; + +import android.net.Uri; + +import java.util.concurrent.atomic.AtomicBoolean; + +// This handles change notification for media sets. +public class ChangeNotifier { + + private MediaSet mMediaSet; + private AtomicBoolean mContentDirty = new AtomicBoolean(true); + + public ChangeNotifier(MediaSet set, Uri uri, GalleryApp application) { + mMediaSet = set; + application.getDataManager().registerChangeNotifier(uri, this); + } + + // Returns the dirty flag and clear it. + public boolean isDirty() { + return mContentDirty.compareAndSet(true, false); + } + + public void fakeChange() { + onChange(false); + } + + public void clearDirty() { + mContentDirty.set(false); + } + + protected void onChange(boolean selfChange) { + if (mContentDirty.compareAndSet(false, true)) { + mMediaSet.notifyContentChanged(); + } + } +}
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