protected override void setImageScaleType(ScaleType scaleType)
{
//Note: we don't implement a "GetScaleType" because we just don't need it.
// take the scaleType provided, and convert it to the appropriate android version.
Android.Widget.ImageView.ScaleType type = Android.Widget.ImageView.ScaleType.FitCenter;
switch (scaleType)
{
case ScaleType.Center:
{
type = Android.Widget.ImageView.ScaleType.Center;
break;
}
case ScaleType.ScaleAspectFill:
{
type = Android.Widget.ImageView.ScaleType.CenterCrop;
break;
}
case ScaleType.ScaleAspectFit:
{
type = Android.Widget.ImageView.ScaleType.FitCenter;
break;
}
}
ImageView.SetScaleType(type);
}
public override void SetScaleType(Android.Widget.ImageView.ScaleType scaleType)
{
if (scaleType != SCALE_TYPE)
{
throw new IllegalArgumentException(string.Format("ScaleType %s not supported.", scaleType));
}
}
public bool IsCached(String requestUrl, int maxWidth, int maxHeight, Android.Widget.ImageView.ScaleType scaleType)
{
ThrowIfNotOnMainThread();
String cacheKey = GetCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
return(mCache.GetBitmap(cacheKey) != null);
}
public void SetScaleType(ImageView.ScaleType scaleType)
{
if (IsSupportedScaleType(scaleType) && scaleType != mScaleType)
{
mScaleType = scaleType;
// Finally update
Update();
}
}
public ImageRequest(String url, IListener listener, int maxWidth, int maxHeight, Android.Widget.ImageView.ScaleType scaleType,
Android.Graphics.Bitmap.Config decodeConfig, IErrorListener errorListener)
: base(Method.GET, url, errorListener)
{
SetRetryPolicy(new DefaultRetryPolicy(IMAGE_TIMEOUT_MS, IMAGE_MAX_RETRIES, IMAGE_BACKOFF_MULT));
mListener = listener;
mDecodeConfig = decodeConfig;
mMaxWidth = maxWidth;
mMaxHeight = maxHeight;
mScaleType = scaleType;
}
public ImageRequest(String url, IListener listener, int maxWidth, int maxHeight, Android.Widget.ImageView.ScaleType scaleType,
Android.Graphics.Bitmap.Config decodeConfig, IErrorListener errorListener)
: base(Method.GET, url, errorListener)
{
SetRetryPolicy(new DefaultRetryPolicy(IMAGE_TIMEOUT_MS, IMAGE_MAX_RETRIES, IMAGE_BACKOFF_MULT));
mListener = listener;
mDecodeConfig = decodeConfig;
mMaxWidth = maxWidth;
mMaxHeight = maxHeight;
mScaleType = scaleType;
}
private static int GetResizedDimension(int maxPrimary, int maxSecondary, int actualPrimary,
int actualSecondary, Android.Widget.ImageView.ScaleType scaleType)
{
if ((maxPrimary == 0) && (maxSecondary == 0))
{
return(actualPrimary);
}
if (scaleType == Android.Widget.ImageView.ScaleType.FitXy)
{
if (maxPrimary == 0)
{
return(actualPrimary);
}
return(maxPrimary);
}
double ratio = 0;
if (maxPrimary == 0)
{
ratio = (double)maxSecondary / (double)actualSecondary;
return((int)(actualPrimary * ratio));
}
if (maxSecondary == 0)
{
return(maxPrimary);
}
ratio = (double)actualSecondary / (double)actualPrimary;
int resized = maxPrimary;
if (scaleType == Android.Widget.ImageView.ScaleType.CenterCrop)
{
if ((resized * ratio) < maxSecondary)
{
resized = (int)(maxSecondary / ratio);
}
return(resized);
}
if ((resized * ratio) > maxSecondary)
{
resized = (int)(maxSecondary / ratio);
}
return(resized);
}
private static bool IsSupportedScaleType(Android.Widget.ImageView.ScaleType scaleType)
{
if (null == scaleType)
{
return(false);
}
if (scaleType.Name().Equals(Android.Widget.ImageView.ScaleType.Matrix.Name()))
{
throw new Java.Lang.IllegalArgumentException(scaleType.Name()
+ " is not supported in PhotoView");
}
else
{
return(true);
}
}
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 ImageContainer Get(String requestUrl, int maxWidth, int maxHeight, Android.Widget.ImageView.ScaleType scaleType,
ImageView view, int defaultImageResId, int errorImageResId)
{
return(Get(requestUrl, maxWidth, maxHeight, scaleType,
(x, y) =>
{
if (x.Bitmap != null)
{
view.SetImageBitmap(x.Bitmap);
}
else if (defaultImageResId != 0)
{
view.SetImageResource(defaultImageResId);
}
}, (x) =>
{
if (errorImageResId != 0)
{
view.SetImageResource(errorImageResId);
}
}));
}
private static String GetCacheKey(String url, int maxWidth, int maxHeight, Android.Widget.ImageView.ScaleType scaleType)
{
return(new StringBuilder(url.Length + 12).Append("#W").Append(maxWidth)
.Append("#H").Append(maxHeight).Append("#S").Append(scaleType.Ordinal()).Append(url).ToString());
}
protected Request MakeImageRequest(String requestUrl, int maxWidth, int maxHeight, Android.Widget.ImageView.ScaleType scaleType, String cacheKey)
{
var listener = new DefaultImageResponseListener()
{
CacheKey = cacheKey,
OnGetImageSuccess = OnGetImageSuccess
};
var errorListener = new DefaultErrorResponseListener()
{
CacheKey = cacheKey,
OnErrorResponse = OnGetImageError
};
return(new ImageRequest(requestUrl, listener, maxWidth, maxHeight, scaleType, Android.Graphics.Bitmap.Config.Rgb565, errorListener));
}
public void SetScaleType(ImageView.ScaleType scaleType)
{
if (IsSupportedScaleType(scaleType) && scaleType != mScaleType) {
mScaleType = scaleType;
// Finally update
Update();
}
}
