package org.dashbuilder.renderer.chartjs.lib;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.user.client.rpc.AsyncCallback;
import org.dashbuilder.renderer.chartjs.lib.data.AreaChartData;
import org.dashbuilder.renderer.chartjs.lib.data.AreaChartDataProvider;
public class LineChart extends ChartWithScale {
private AreaChartDataProvider provider = null;
@Override
public void draw() {
reload();
}
private native void drawLine(JavaScriptObject data)/*-{
canvas = this.@org.dashbuilder.renderer.chartjs.lib.LineChart::getNativeElement()();
nativeCanvas = this.@org.dashbuilder.renderer.chartjs.lib.LineChart::getNativeCanvas()();
if(nativeCanvas != null) {
nativeCanvas.destroy();
}
var options = this.@org.dashbuilder.renderer.chartjs.lib.LineChart::constructOptions()();
nativeCanvas = new $wnd.Chart(canvas.getContext("2d")).Line(data,options);
this.@org.dashbuilder.renderer.chartjs.lib.LineChart::setNativeCanvas(Lcom/google/gwt/core/client/JavaScriptObject;)(nativeCanvas);
}-*/;
@Override
public void update() {
if(provider == null)
throw new NullPointerException("Data provider is not specified before calling update()");
drawLine(provider.getData());
}
@Override
public void reload() {
if(provider == null)
throw new NullPointerException("Data provider is not specified before calling reload()");
//TODO: show some king of loading to user
provider.reload(new AsyncCallback<AreaChartData>() {
@Override
public void onSuccess(AreaChartData result) {
drawLine(result);
}
@Override
public void onFailure(Throwable caught) {
//TODO: show loading error to user
}
});
}
public void setDataProvider(AreaChartDataProvider provider){
this.provider = provider;
}
}