Canvas not draw after dofinnally

asked 2015-07-16 15:23:59 +0800

adolfoleonardi gravatar image adolfoleonardi
1 1

Hi I use the library canvas4z to draw a simple circle, but the browser show the circle only after ad event (eg button click). I'd like to see the circle after the dofinnally method!

Where is my error?

Adolfo Leonardi

zul page: <zk> <window title="pippo" border="normal" apply="PippoController" &gt;="" <canvas="" id="canvas" width="50px" height="50px"/> <button id="refresh" label="refresh"></button> </window> </zk>

and PippoController.java

import java.awt.geom.Arc2D;
import org.zkforge.canvas.Canvas;
import org.zkforge.canvas.Drawable;
import org.zkforge.canvas.Path;
import org.zkoss.zk.ui.Component;
import org.zkoss.zul.Button;
import org.zkoss.zk.ui.select.SelectorComposer;
import org.zkoss.zk.ui.select.annotation.Listen;
import org.zkoss.zk.ui.select.annotation.VariableResolver;
import org.zkoss.zk.ui.select.annotation.Wire;
import org.zkoss.zkplus.spring.DelegatingVariableResolver;

public class PippoController extends SelectorComposer<Component> {
    private static final long serialVersionUID = 6468999863309679635L;
    @Wire Button refresh;
    @Wire   Canvas canvas; 
    Path circlegreeen = new Path(new Arc2D.Double(5,5, 40, 40, 0, 360,  Arc2D.CHORD));
    public void doAfterCompose(Component comp) throws Exception {


    public void onClick_refresh() throws Throwable{
    public void doFinally() throws Exception {
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4 Answers

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answered 2015-07-20 08:54:38 +0800

Darksu gravatar image Darksu
1991 1 4

Hello adolfoleonardi,

The doFinally is called after the component has been composed completely.

The doAfterCompose invokes after ZK loader creates this component, initializes it and composes all its children, if any.

Best Regards,


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answered 2015-07-20 09:37:25 +0800

adolfoleonardi gravatar image adolfoleonardi
1 1

Hi Darksu, i tried to insert the " canvas.add(circlegreeen);" in doFinally and in then doAfterCompose, but the browse doesn't draw the circle. The circle is showed only the onclick event, why?

Adolfo Leonardi

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answered 2015-07-27 09:38:15 +0800

adolfoleonardi gravatar image adolfoleonardi
1 1

any suggestions?

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answered 2015-07-31 10:55:51 +0800

adolfoleonardi gravatar image adolfoleonardi
1 1


@Wire Window win;

public void doFinally() throws Exception {
    Events.echoEvent("onLater", win, null); //echo an event back 
public void onLater_win() throws Throwable{     
    //Draw my cancas
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Asked: 2015-07-16 15:23:59 +0800

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Last updated: Jul 31 '15

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