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<http://stackoverflow.com/questions/37947326/simplepanel-can-only-contain-one-child-widget#>
When i run the following Code and push Button "Push", more than once a
time, i get browser error "simplePanel can only contain one child widget".
How can i solve that problem? thank you in advance! Jogi
public class Projekt implements EntryPoint {
private RootPanel rootPanel;
public void onModuleLoad() {
rootPanel = RootPanel.get("gwtContainer");
rootPanel.setSize("1902", "868");
final AbsolutePanel boundaryPanel = new AbsolutePanel();
boundaryPanel.setStyleName("frame1");
boundaryPanel.setSize("1455px", "600px");
final Diagram diagram = new Diagram(boundaryPanel);
RootPanel.get().add(boundaryPanel, 446, 242);
final Connector con = new Connector(100, 300, 300, 500);
Button la = new Button("Push");
la.setSize("200", "200");
RootPanel.get().add(la);
Button la2 = new Button("Push2");
la2.setSize("200", "200");
RootPanel.get().add(la2);
final Image img = new Image("images/concrete.svg");
img.setSize("200", "200");
final Shape shapei = new Shape(img);
Image img2 = new Image("images/variable.svg");
img2.setSize("200", "200");
boundaryPanel.add(img2, 200,200);
final Shape shapei2 = new Shape(img2);
shapei2.showOnDiagram(diagram);
la.addClickHandler(new ClickHandler(){
@Override
public void onClick(ClickEvent event) {
boundaryPanel.add(img, 100,100);
shapei.showOnDiagram(diagram);
}
});
la2.addClickHandler(new ClickHandler(){
@Override
public void onClick(ClickEvent event) {
con.showOnDiagram(diagram);
}
});
diagram.addDiagramListener(new DiagramListenerAdapter() {
@Override
public void onElementConnect(ElementConnectEvent event) {
if (con.startEndPoint.isGluedToConnectionPoint()) {
Widget connected =
con.startEndPoint.gluedConnectionPoint.parentWidget;
if(connected.equals(shapei.connectedWidget)){
Image logo = new Image("images/xor.svg");
logo.setSize("100", "100");
boundaryPanel.add(logo);
}
else if(connected.equals(shapei2.connectedWidget)){
Image logo2 = new Image("images/and.svg");
logo2.setSize("100", "100");
boundaryPanel.add(logo2);
};
}}
});
}}
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