diff options
Diffstat (limited to 'src/org/cyanogenmod/audiofx/preset/InfinitePagerAdapter.java')
| -rw-r--r-- | src/org/cyanogenmod/audiofx/preset/InfinitePagerAdapter.java | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/org/cyanogenmod/audiofx/preset/InfinitePagerAdapter.java b/src/org/cyanogenmod/audiofx/preset/InfinitePagerAdapter.java new file mode 100644 index 0000000..e090ea8 --- /dev/null +++ b/src/org/cyanogenmod/audiofx/preset/InfinitePagerAdapter.java @@ -0,0 +1,110 @@ +/* + * Copyright (C) 2016 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.audiofx.preset; + +import android.os.Parcelable; +import android.support.v4.view.PagerAdapter; +import android.util.Log; +import android.view.View; +import android.view.ViewGroup; + +/** + * A PagerAdapter that wraps around another PagerAdapter to handle paging wrap-around. + */ +public class InfinitePagerAdapter extends PagerAdapter { + + private static final String TAG = "InfinitePagerAdapter"; + private static final boolean DEBUG = false; + + private PagerAdapter adapter; + + public InfinitePagerAdapter(PagerAdapter adapter) { + this.adapter = adapter; + } + + @Override + public int getCount() { + // warning: scrolling to very high values (1,000,000+) results in + // strange drawing behaviour + return Integer.MAX_VALUE; + } + + /** + * @return the {@link #getCount()} result of the wrapped adapter + */ + public int getRealCount() { + return adapter.getCount(); + } + + @Override + public Object instantiateItem(ViewGroup container, int position) { + int virtualPosition = position % getRealCount(); + debug("instantiateItem: real position: " + position); + debug("instantiateItem: virtual position: " + virtualPosition); + + // only expose virtual position to the inner adapter + return adapter.instantiateItem(container, virtualPosition); + } + + @Override + public void destroyItem(ViewGroup container, int position, Object object) { + int virtualPosition = position % getRealCount(); + debug("destroyItem: real position: " + position); + debug("destroyItem: virtual position: " + virtualPosition); + + // only expose virtual position to the inner adapter + adapter.destroyItem(container, virtualPosition, object); + } + + /* + * Delegate rest of methods directly to the inner adapter. + */ + + @Override + public void finishUpdate(ViewGroup container) { + adapter.finishUpdate(container); + } + + @Override + public boolean isViewFromObject(View view, Object object) { + return adapter.isViewFromObject(view, object); + } + + @Override + public void restoreState(Parcelable bundle, ClassLoader classLoader) { + adapter.restoreState(bundle, classLoader); + } + + @Override + public Parcelable saveState() { + return adapter.saveState(); + } + + @Override + public void startUpdate(ViewGroup container) { + adapter.startUpdate(container); + } + + /* + * End delegation + */ + + private void debug(String message) { + if (DEBUG) { + Log.d(TAG, message); + } + } +}
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