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// Copyright (C) 2013 The Android Open Source Project
//
// 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 net.codemirror.lib;
import com.google.gerrit.client.rpc.CallbackGroup;
import com.google.gwt.core.client.Callback;
import com.google.gwt.core.client.ScriptInjector;
import com.google.gwt.dom.client.ScriptElement;
import com.google.gwt.dom.client.StyleInjector;
import com.google.gwt.resources.client.ExternalTextResource;
import com.google.gwt.resources.client.ResourceCallback;
import com.google.gwt.resources.client.ResourceException;
import com.google.gwt.resources.client.TextResource;
import com.google.gwt.safehtml.shared.SafeUri;
import com.google.gwt.user.client.rpc.AsyncCallback;
public class Loader {
private static native boolean isLibLoaded() /*-{ return $wnd.hasOwnProperty('CodeMirror'); }-*/;
static void initLibrary(AsyncCallback<Void> cb) {
if (isLibLoaded()) {
cb.onSuccess(null);
return;
}
CallbackGroup group = new CallbackGroup();
injectCss(Lib.I.css(), group.<Void>addEmpty());
injectScript(
Lib.I.js().getSafeUri(),
group.add(
new AsyncCallback<Void>() {
@Override
public void onSuccess(Void result) {
Vim.initKeyMap();
}
@Override
public void onFailure(Throwable caught) {}
}));
group.addListener(cb);
group.done();
}
private static void injectCss(ExternalTextResource css, AsyncCallback<Void> cb) {
try {
css.getText(
new ResourceCallback<TextResource>() {
@Override
public void onSuccess(TextResource resource) {
StyleInjector.inject(resource.getText());
Lib.I.style().ensureInjected();
cb.onSuccess(null);
}
@Override
public void onError(ResourceException e) {
cb.onFailure(e);
}
});
} catch (ResourceException e) {
cb.onFailure(e);
}
}
public static void injectScript(SafeUri js, AsyncCallback<Void> callback) {
final ScriptElement[] script = new ScriptElement[1];
script[0] =
ScriptInjector.fromUrl(js.asString())
.setWindow(ScriptInjector.TOP_WINDOW)
.setCallback(
new Callback<Void, Exception>() {
@Override
public void onSuccess(Void result) {
script[0].removeFromParent();
callback.onSuccess(result);
}
@Override
public void onFailure(Exception reason) {
callback.onFailure(reason);
}
})
.inject()
.cast();
}
private Loader() {}
}