/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* 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 com.badlogic.gdx.backends.gwt.preloader;
import com.badlogic.gdx.backends.gwt.preloader.AssetFilter.AssetType;
import com.badlogic.gdx.utils.GdxRuntimeException;
import com.google.gwt.dom.client.ImageElement;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.typedarrays.shared.Int8Array;
import com.google.gwt.typedarrays.shared.TypedArrays;
import com.google.gwt.xhr.client.ReadyStateChangeHandler;
import com.google.gwt.xhr.client.XMLHttpRequest;
import com.google.gwt.xhr.client.XMLHttpRequest.ResponseType;
public class AssetDownloader {
public AssetDownloader () {
useBrowserCache = true;
useInlineBase64 = false;
}
public void setUseBrowserCache (boolean useBrowserCache) {
this.useBrowserCache = useBrowserCache;
}
public boolean isUseBrowserCache () {
return useBrowserCache;
}
public void setUseInlineBase64 (boolean useInlineBase64) {
this.useInlineBase64 = useInlineBase64;
}
public boolean isUseInlineBase64 () {
return useInlineBase64;
}
public interface AssetLoaderListener<T> {
public void onProgress (double amount);
public void onFailure ();
public void onSuccess (T result);
}
public void load (String url, AssetType type, String mimeType, AssetLoaderListener<?> listener) {
switch (type) {
case Text:
loadText(url, (AssetLoaderListener<String>)listener);
break;
case Image:
loadImage(url, mimeType, (AssetLoaderListener<ImageElement>)listener);
break;
case Binary:
loadBinary(url, (AssetLoaderListener<Blob>)listener);
break;
case Audio:
loadAudio(url, (AssetLoaderListener<Void>)listener);
break;
case Directory:
listener.onSuccess(null);
break;
default:
throw new GdxRuntimeException("Unsupported asset type " + type);
}
}
public void loadText (String url, final AssetLoaderListener<String> listener) {
XMLHttpRequest request = XMLHttpRequest.create();
request.setOnReadyStateChange(new ReadyStateChangeHandler() {
@Override
public void onReadyStateChange (XMLHttpRequest xhr) {
if (xhr.getReadyState() == XMLHttpRequest.DONE) {
if (xhr.getStatus() != 200) {
listener.onFailure();
} else {
listener.onSuccess(xhr.getResponseText());
}
}
}
});
setOnProgress(request, listener);
request.open("GET", url);
request.setRequestHeader("Content-Type", "text/plain; charset=utf-8");
request.send();
}
public void loadBinary (final String url, final AssetLoaderListener<Blob> listener) {
XMLHttpRequest request = XMLHttpRequest.create();
request.setOnReadyStateChange(new ReadyStateChangeHandler() {
@Override
public void onReadyStateChange (XMLHttpRequest xhr) {
if (xhr.getReadyState() == XMLHttpRequest.DONE) {
if (xhr.getStatus() != 200) {
listener.onFailure();
} else {
Int8Array data = TypedArrays.createInt8Array(xhr.getResponseArrayBuffer());
listener.onSuccess(new Blob(data));
}
}
}
});
setOnProgress(request, listener);
request.open("GET", url);
request.setResponseType(ResponseType.ArrayBuffer);
request.send();
}
public void loadAudio (String url, final AssetLoaderListener<Void> listener) {
if (useBrowserCache) {
loadBinary(url, new AssetLoaderListener<Blob>() {
@Override
public void onProgress (double amount) {
listener.onProgress(amount);
}
@Override
public void onFailure () {
listener.onFailure();
}
@Override
public void onSuccess (Blob result) {
listener.onSuccess(null);
}
});
} else {
listener.onSuccess(null);
}
}
public void loadImage (final String url, final String mimeType, final AssetLoaderListener<ImageElement> listener) {
loadImage(url, mimeType, null, listener);
}
public void loadImage (final String url, final String mimeType, final String crossOrigin, final AssetLoaderListener<ImageElement> listener) {
if (useBrowserCache || useInlineBase64) {
loadBinary(url, new AssetLoaderListener<Blob>() {
@Override
public void onProgress (double amount) {
listener.onProgress(amount);
}
@Override
public void onFailure () {
listener.onFailure();
}
@Override
public void onSuccess (Blob result) {
final ImageElement image = createImage();
if (crossOrigin != null) {
image.setAttribute("crossOrigin", crossOrigin);
}
hookImgListener(image, new ImgEventListener() {
@Override
public void onEvent (NativeEvent event) {
if (event.getType().equals("error"))
listener.onFailure();
else
listener.onSuccess(image);
}
});
if (isUseInlineBase64()) {
image.setSrc("data:" + mimeType + ";base64," + result.toBase64());
} else {
image.setSrc(url);
}
}
});
} else {
final ImageElement image = createImage();
if (crossOrigin != null) {
image.setAttribute("crossOrigin", crossOrigin);
}
hookImgListener(image, new ImgEventListener() {
@Override
public void onEvent (NativeEvent event) {
if (event.getType().equals("error"))
listener.onFailure();
else
listener.onSuccess(image);
}
});
image.setSrc(url);
}
}
private static interface ImgEventListener {
public void onEvent (NativeEvent event);
}
static native void hookImgListener (ImageElement img, ImgEventListener h) /*-{
img
.addEventListener(
'load',
function(e) {
h.@com.badlogic.gdx.backends.gwt.preloader.AssetDownloader.ImgEventListener::onEvent(Lcom/google/gwt/dom/client/NativeEvent;)(e);
}, false);
img
.addEventListener(
'error',
function(e) {
h.@com.badlogic.gdx.backends.gwt.preloader.AssetDownloader.ImgEventListener::onEvent(Lcom/google/gwt/dom/client/NativeEvent;)(e);
}, false);
}-*/;
static native ImageElement createImage () /*-{
return new Image();
}-*/;
private native static void setOnProgress (XMLHttpRequest req, AssetLoaderListener listener) /*-{
var _this = this;
this.onprogress = $entry(function(evt) {
listener.@com.badlogic.gdx.backends.gwt.preloader.AssetDownloader.AssetLoaderListener::onProgress(D)(evt.loaded);
});
}-*/;
private boolean useBrowserCache;
private boolean useInlineBase64;
}