private void updateSlidingWindow() {
// 1. Update the image window
int start =
Utils.clamp(mCurrentIndex - IMAGE_CACHE_SIZE / 2, 0, Math.max(0, mSize - IMAGE_CACHE_SIZE));
int end = Math.min(mSize, start + IMAGE_CACHE_SIZE);
if (mActiveStart == start && mActiveEnd == end) return;
mActiveStart = start;
mActiveEnd = end;
// 2. Update the data window
start =
Utils.clamp(mCurrentIndex - DATA_CACHE_SIZE / 2, 0, Math.max(0, mSize - DATA_CACHE_SIZE));
end = Math.min(mSize, start + DATA_CACHE_SIZE);
if (mContentStart > mActiveStart
|| mContentEnd < mActiveEnd
|| Math.abs(start - mContentStart) > MIN_LOAD_COUNT) {
for (int i = mContentStart; i < mContentEnd; ++i) {
if (i < start || i >= end) {
mData[i % DATA_CACHE_SIZE] = null;
}
}
mContentStart = start;
mContentEnd = end;
if (mReloadTask != null) mReloadTask.notifyDirty();
}
}
public void resume() {
mIsActive = true;
mSource.addContentListener(mSourceListener);
updateImageCache();
updateImageRequests();
mReloadTask = new ReloadTask();
mReloadTask.start();
mPhotoView.notifyModelInvalidated();
}
public void setCurrentPhoto(Path path, int indexHint) {
if (mItemPath == path) return;
mItemPath = path;
mCurrentIndex = indexHint;
updateSlidingWindow();
updateImageCache();
fireModelInvalidated();
// We need to reload content if the path doesn't match.
MediaItem item = getCurrentMediaItem();
if (item != null && item.getPath() != path) {
if (mReloadTask != null) mReloadTask.notifyDirty();
}
}
public void pause() {
mIsActive = false;
mReloadTask.terminate();
mReloadTask = null;
mSource.removeContentListener(mSourceListener);
for (ImageEntry entry : mImageCache.values()) {
if (entry.fullImageTask != null) entry.fullImageTask.cancel();
if (entry.screenNailTask != null) entry.screenNailTask.cancel();
}
mImageCache.clear();
mTileProvider.clear();
}
