I am trying to use an example from the Flex Help to setup listeners
for buttons. I cannot figure out how to get this code to work. If I
just use the AS code, I get "cannot find this method" errors. If I
add the buttons to the MXML, then the script runs, but I get two
buttons. Plus the canvas piece doesn't work at all. Here is the
code Flex provides in the help that I am copying:
Example
The following example attaches three buttons to the Stage, and lets
the user draw lines in the SWF file at runtime, using the mouse
pointer. One button clears all of the lines from the SWF file. The
second button removes the mouse listener so the user cannot draw
lines. The third button adds the mouse listener after it is removed,
so the user can draw lines again. Add the following ActionScript:
/* Add an instance of the Button
component to be placed in the Library.
This example attaches and positions three Button
instances on the Stage. */
this.createClassObject(mx.controls.Button, "clear_button",
this.getNextHighestDepth(), {_x:10, _y:10, label:'clear'});
this.createClassObject(mx.controls.Button, "stopDrawing_button",
this.getNextHighestDepth(), {_x:120, _y:10, label:'stop drawing'});
this.createClassObject(mx.controls.Button, "startDrawing_button",
this.getNextHighestDepth(), {_x:230, _y:10, label:'start drawing'});
startDrawing_button.enabled = false;
//
this.createEmptyMovieClip("canvas_mc", this.getNextHighestDepth());
var mouseListener:Object = new Object();
mouseListener.onMouseDown = function() {
this.isDrawing = true;
canvas_mc.lineStyle(2, 0xFF0000, 100);
canvas_mc.moveTo(_xmouse, _ymouse);
};
mouseListener.onMouseMove = function() {
if (this.isDrawing) {
canvas_mc.lineTo(_xmouse, _ymouse);
}
updateAfterEvent();
};
mouseListener.onMouseUp = function() {
this.isDrawing = false;
};
Mouse.addListener(mouseListener);
var clearListener:Object = new Object();
clearListener.click = function() {
canvas_mc.clear();
};
clear_button.addEventListener("click", clearListener);
//
var stopDrawingListener:Object = new Object();
stopDrawingListener.click = function(evt:Object) {
Mouse.removeListener(mouseListener);
evt.target.enabled = false;
startDrawing_button.enabled = true;
};
stopDrawing_button.addEventListener("click", stopDrawingListener);
var startDrawingListener:Object = new Object();
startDrawingListener.click = function(evt:Object) {
Mouse.addListener(mouseListener);
evt.target.enabled = false;
stopDrawing_button.enabled = true;
};
startDrawing_button.addEventListener("click", startDrawingListener);
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