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index.zulzul<zk xmlns:n="native">
<script src="drawing.js"/>
<window border="normal" title="hello" apply="pkg$.TestComposer">
<n:canvas width="400px" height="300px" id="mycanvas"></n:canvas>
<textbox rows="20" id="logBox"></textbox>
</window>
</zk>
TestComposer.javajavaimport org.zkoss.zk.ui.*;
import org.zkoss.zk.ui.event.*;
import org.zkoss.zk.ui.util.*;
import org.zkoss.zk.ui.ext.*;
import org.zkoss.zk.au.*;
import org.zkoss.zk.au.out.*;
import org.zkoss.zul.*;
public class TestComposer extends GenericForwardComposer{
public void doAfterCompose(Component comp) throws Exception {
super.doAfterCompose(comp);
Clients.evalJavaScript("startDrawing()");
}
public void onClick$btn(Event e) throws InterruptedException{
Messagebox.show("Hi btn");
}
}
drawing.jsjavascriptstartDrawing = function(){
// get the canvas element and its context
var canvas = document.getElementById('mycanvas');
var context = canvas.getContext('2d');
// create a drawer which tracks touch movements
var drawer = {
isDrawing: false,
touchstart: function (coors) {
log("touchstart " + coors.x + " " + coors.y);
console.log("touchstart");
context.beginPath();
context.moveTo(coors.x, coors.y);
this.isDrawing = true;
},
mousedown: function(coors){
log("mousedown " + coors.x + " " + coors.y);
console.log("mousedown");
context.beginPath();
context.moveTo(coors.x, coors.y);
this.isDrawing = true;
},
touchmove: function (coors) {
log("touchmove " + coors.x + " " + coors.y);
console.log("touchmove");
if (this.isDrawing) {
context.lineTo(coors.x, coors.y);
context.stroke();
}
},
mousemove: function (coors) {
log("mousemove " + coors.x + " " + coors.y);
console.log("mousemove");
if (this.isDrawing) {
context.lineTo(coors.x, coors.y);
context.stroke();
}
},
touchend: function (coors) {
log("touchend " + coors.x + " " + coors.y);
console.log("touchend");
if (this.isDrawing) {
context.lineTo(coors.x, coors.y);
context.stroke();
this.isDrawing = false;
}
},
mouseup: function (coors) {
log("mouseup " + coors.x + " " + coors.y);
console.log("mouseup");
if (this.isDrawing) {
context.lineTo(coors.x, coors.y);
context.stroke();
this.isDrawing = false;
}
},
mouseout: function (coors) {
log("mouseout " + coors.x + " " + coors.y);
console.log("mouseout");
if (this.isDrawing) {
context.lineTo(coors.x, coors.y);
context.stroke();
this.isDrawing = false;
}
},
};
// create a function to pass touch events and coordinates to drawer
function draw(event) {
// get the touch coordinates
var coors = {
x: event.pageX || (event.targetTouches.length > 0 ? event.targetTouches[0].pageX : undefined),
y: event.pageY || (event.targetTouches.length > 0 ? event.targetTouches[0].pageY : undefined)
};
coors.x = coors.x - canvas.offsetLeft;
coors.y = coors.y - canvas.offsetTop;
// pass the coordinates to the appropriate handler
drawer[event.type](coors);
}
// attach the touchstart, touchmove, touchend event listeners.
canvas.addEventListener('touchstart', draw, false);
canvas.addEventListener('touchmove', draw, false);
canvas.addEventListener('touchend', draw, false);
canvas.addEventListener('mouseup', draw, false);
canvas.addEventListener('mousedown', draw, false);
canvas.addEventListener('mousemove', draw, false);
canvas.addEventListener('mouseout', draw, false);
// prevent elastic scrolling
document.body.addEventListener('touchmove', function (event) {
event.preventDefault();
}, false); // end body.onTouchMove
}
log = function(text){
var logBox = jq("$logBox");
logBox.val(logBox.val() + text + "\n");
if(logBox.length){
logBox.scrollTop(logBox[0].scrollHeight - logBox.height());
}
}