/**
* stops all picture loading except if the Url we desire is being loaded
*
* @param url The URL of the image which is to be loaded.
*/
public void stopLoadingExcept(URL url) {
if (sourcePicture != null) {
boolean isCurrentlyLoading = sourcePicture.stopLoadingExcept(url);
if (!isCurrentlyLoading) {
// sourcePicture.removeListener( this );
}
PictureCache.stopBackgroundLoadingExcept(url);
}
}
/**
* method to invoke with a filename or URL of a picture that is to be loaded and scaled in a new
* thread. This is handy to update the screen while the loading chuggs along in the background.
* Make sure you invoked setScaleFactor or setScaleSize before invoking this method.
*
* <p>Step 1: Am I already loading what I need somewhere? If yes -> use it. Has it finished
* loading? If no -> wait for it If yes -> use it Else -> load it
*
* @param priority The Thread priority
* @param imageUrl The URL of the image you want to load
* @param rotation The rotation 0-360 that the image should be put through after loading.
*/
public void loadAndScalePictureInThread(URL imageUrl, int priority, double rotation) {
this.imageUrl = imageUrl;
boolean alreadyLoading = false;
Tools.log(
"ScalablePicture.loadAndScalePictureInThread: checking if picture "
+ imageUrl
+ " is already being loaded.");
if ((sourcePicture != null)
&& (sourcePicture.getUrl().toString().equals(imageUrl.toString()))) {
Tools.log(
"ScalablePicture.loadAndScalePictureInThread: the SourcePicture is already loading the sourcePictureimage");
alreadyLoading = true;
} else if (PictureCache.isInCache(imageUrl)) {
// in case the old image has a listener connected remove it
// fist time round the sourcePicture is still null therefore the if.
if (sourcePicture != null) sourcePicture.removeListener(this);
sourcePicture = PictureCache.getSourcePicture(imageUrl);
String status = sourcePicture.getStatusMessage();
if (status == null) status = "";
Tools.log("ScalablePicture.loadAndScalePictureInThread: Picture in cache! Status: " + status);
if (sourcePicture.getRotation() == rotation) {
alreadyLoading = true;
Tools.log(
"ScalablePicture.loadAndScalePictureInThread: Picture was even rotated to the correct angle!");
} else {
alreadyLoading = false;
Tools.log(
"ScalablePicture.loadAndScalePictureInThread: Picture was in cache but with wrong rotation. Forcing reload.");
}
}
if (alreadyLoading) {
switch (sourcePicture.getStatusCode()) {
case SourcePicture.UNINITIALISED:
alreadyLoading = false;
Tools.log(
"ScalablePicture.loadAndScalePictureInThread: pictureStatus was: UNINITIALISED");
break;
case SourcePicture.ERROR:
alreadyLoading = false;
Tools.log("ScalablePicture.loadAndScalePictureInThread: pictureStatus was: ERROR");
break;
case SourcePicture.LOADING:
Tools.log("ScalablePicture.loadAndScalePictureInThread: pictureStatus was: LOADING");
sourcePicture.addListener(this);
setStatus(LOADING, "Loading: " + imageUrl.toString());
sourceLoadProgressNotification(
SourcePicture.LOADING_PROGRESS, sourcePicture.getPercentLoaded());
scaleAfterLoad = true;
break;
case SourcePicture.ROTATING:
Tools.log("ScalablePicture.loadAndScalePictureInThread: pictureStatus was: ROTATING");
setStatus(LOADING, "Rotating: " + imageUrl.toString());
sourceLoadProgressNotification(
SourcePicture.LOADING_PROGRESS, sourcePicture.getPercentLoaded());
scaleAfterLoad = true;
break;
case SourcePicture.READY:
Tools.log(
"ScalablePicture.loadAndScalePictureInThread: pictureStatus was: READY. Sending SCALING status.");
setStatus(SCALING, "Scaling: " + imageUrl.toString());
createScaledPictureInThread(priority);
break;
default:
Tools.log(
"ScalablePicture.loadAndScalePictureInThread: Don't know what status this is:"
+ Integer.toString(sourcePicture.getStatusCode()));
break;
}
}
// if the image is not already there then load it.
if (!alreadyLoading) {
if (sourcePicture != null) sourcePicture.removeListener(this);
sourcePicture = new SourcePicture();
sourcePicture.addListener(this);
setStatus(LOADING, "Loading: " + imageUrl.toString());
scaleAfterLoad = true;
sourcePicture.loadPictureInThread(imageUrl, priority, rotation);
// when the thread is done it sends a sourceStatusChange message to us
}
}
