public bool RemoveContainerAndCancelIfNecessary(ImageContainer container)
{
mContainers.Remove(container);
if (mContainers.Count == 0)
{
mRequest.Cancel();
return(true);
}
return(false);
}
public bool RemoveContainerAndCancelIfNecessary(ImageContainer container)
{
mContainers.Remove(container);
if (mContainers.Count == 0)
{
mRequest.Cancel();
return true;
}
return false;
}
protected override void OnDetachedFromWindow()
{
if (mImageContainer != null)
{
mImageContainer.CancelRequest();
SetImageBitmap(null);
mImageContainer = null;
}
base.OnDetachedFromWindow();
}
private void LoadImageIfNecessary(bool isInLayoutPass)
{
int width = Width;
int height = Height;
ScaleType scaleType = GetScaleType();
bool wrapWidth = false, wrapHeight = false;
if (LayoutParameters != null)
{
wrapWidth = LayoutParameters.Width == ViewGroup.LayoutParams.WrapContent;
wrapHeight = LayoutParameters.Height == ViewGroup.LayoutParams.WrapContent;
}
bool isFullWrapContent = wrapWidth && wrapHeight;
if (width == 0 && height == 0 && !isFullWrapContent)
{
return;
}
if (String.IsNullOrEmpty(mUrl))
{
if (mImageContainer != null)
{
mImageContainer.CancelRequest();
mImageContainer = null;
}
SetDefaultImageOrNull();
return;
}
if (mImageContainer != null && mImageContainer.GetRequestUrl() != null)
{
if (mImageContainer.GetRequestUrl() == mUrl)
{
return;
}
else
{
mImageContainer.CancelRequest();
SetDefaultImageOrNull();
}
}
int maxWidth = wrapWidth ? 0 : width;
int maxHeight = wrapHeight ? 0 : height;
ImageContainer newContainer = mImageLoader.Get(mUrl, new DefaultImageListener(), maxWidth, maxHeight, scaleType);
mImageContainer = newContainer;
}
public ImageContainer Get(String requestUrl, int maxWidth, int maxHeight, Android.Widget.ImageView.ScaleType scaleType,
Action <ImageContainer, bool> successResponse, Action <VolleyError> errorResponse)
{
ThrowIfNotOnMainThread();
if (successResponse == null)
{
throw new ArgumentNullException("successResponse不能为null，必须提供请求成功的委托。");
}
String cacheKey = GetCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
//缓存命中直接响应请求
Bitmap cachedBitmap = mCache.GetBitmap(cacheKey);
if (cachedBitmap != null)
{
ImageContainer container = new ImageContainer(cachedBitmap, requestUrl, null, mInFlightRequests,
mBatchedResponses);
successResponse(container, true);
return(container);
}
//缓存未命中添加到请求中
ImageContainer imageContainer = new ImageContainer(null, requestUrl, cacheKey, mInFlightRequests,
mBatchedResponses);
imageContainer.ErrorResponse += errorResponse;
imageContainer.SuccessResponse += successResponse;
successResponse(imageContainer, true);
//是否存在相同的请求，存在则添加该请求，否则创建
BatchedImageRequest request = null;
mInFlightRequests.TryGetValue(cacheKey, out request);
if (request != null)
{
request.AddContainer(imageContainer);
return(imageContainer);
}
Request newRequest = MakeImageRequest(requestUrl, maxWidth, maxHeight, scaleType, cacheKey);
mRequestQueue.Add(newRequest);
mInFlightRequests.Add(cacheKey, new BatchedImageRequest(newRequest, imageContainer));
return(imageContainer);
}
public void OnResponse(ImageContainer response, bool isImmediate)
{
if (isImmediate && isInLayoutPass)
{
Post(() =>
{
OnResponse(response, false);
});
return;
}
if (response.GetBitmap() != null)
{
SetImageBitmap(response.GetBitmap());
}
else if (mDefaultImageId != 0)
{
SetImageResource(mDefaultImageId);
}
}
/// <summary>
/// ���һ���µ�ͼƬ����
/// </summary>
/// <param name="container"></param>
public void AddContainer(ImageContainer container)
{
mContainers.Add(container);
}
public BatchedImageRequest(Request request, ImageContainer container)
{
mRequest = request;
mContainers.Add(container);
}
/// <summary>
/// 添加一个新的图片请求
/// </summary>
/// <param name="container"></param>
public void AddContainer(ImageContainer container)
{
mContainers.Add(container);
}
public BatchedImageRequest(Request request, ImageContainer container)
{
mRequest = request;
mContainers.Add(container);
}
protected override void OnDetachedFromWindow()
{
if (mImageContainer != null)
{
mImageContainer.CancelRequest();
SetImageBitmap(null);
mImageContainer = null;
}
base.OnDetachedFromWindow();
}
public void OnResponse(ImageContainer response, bool isImmediate)
{
if (isImmediate && isInLayoutPass)
{
Post(() =>
{
OnResponse(response, false);
});
return;
}
if (response.GetBitmap() != null)
{
SetImageBitmap(response.GetBitmap());
}
else if (mDefaultImageId != 0)
{
SetImageResource(mDefaultImageId);
}
}
private void LoadImageIfNecessary(bool isInLayoutPass)
{
int width = Width;
int height = Height;
ScaleType scaleType = GetScaleType();
bool wrapWidth = false, wrapHeight = false;
if (LayoutParameters != null)
{
wrapWidth = LayoutParameters.Width == ViewGroup.LayoutParams.WrapContent;
wrapHeight = LayoutParameters.Height == ViewGroup.LayoutParams.WrapContent;
}
bool isFullWrapContent = wrapWidth && wrapHeight;
if (width == 0 && height == 0 && !isFullWrapContent)
{
return;
}
if (String.IsNullOrEmpty(mUrl))
{
if (mImageContainer != null)
{
mImageContainer.CancelRequest();
mImageContainer = null;
}
SetDefaultImageOrNull();
return;
}
if (mImageContainer != null && mImageContainer.GetRequestUrl() != null)
{
if (mImageContainer.GetRequestUrl() == mUrl)
{
return;
}
else
{
mImageContainer.CancelRequest();
SetDefaultImageOrNull();
}
}
int maxWidth = wrapWidth ? 0 : width;
int maxHeight = wrapHeight ? 0 : height;
ImageContainer newContainer = mImageLoader.Get(mUrl, new DefaultImageListener(), maxWidth, maxHeight, scaleType);
mImageContainer = newContainer;
}
public ImageContainer Get(String requestUrl, int maxWidth, int maxHeight, Android.Widget.ImageView.ScaleType scaleType,
Action<ImageContainer, bool> successResponse, Action<VolleyError> errorResponse)
{
ThrowIfNotOnMainThread();
if (successResponse == null)
{
throw new ArgumentNullException("successResponse����Ϊnull�������ṩ����ɹ���ί�С�");
}
String cacheKey = GetCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
//��������ֱ����Ӧ����
Bitmap cachedBitmap = mCache.GetBitmap(cacheKey);
if (cachedBitmap != null)
{
ImageContainer container = new ImageContainer(cachedBitmap, requestUrl, null, mInFlightRequests,
mBatchedResponses);
successResponse(container, true);
return container;
}
//����δ������ӵ�������
ImageContainer imageContainer = new ImageContainer(null, requestUrl, cacheKey, mInFlightRequests,
mBatchedResponses);
imageContainer.ErrorResponse += errorResponse;
imageContainer.SuccessResponse += successResponse;
successResponse(imageContainer, true);
//�Ƿ������ͬ������������Ӹ�������
BatchedImageRequest request = null;
mInFlightRequests.TryGetValue(cacheKey, out request);
if (request != null)
{
request.AddContainer(imageContainer);
return imageContainer;
}
Request newRequest = MakeImageRequest(requestUrl, maxWidth, maxHeight, scaleType, cacheKey);
mRequestQueue.Add(newRequest);
mInFlightRequests.Add(cacheKey, new BatchedImageRequest(newRequest, imageContainer));
return imageContainer;
}
