Illustrates the distinctive priority of USER vs. PROGRAMMATIC events in ScriptUI

TestEventsPriority.jsx

(function testEventsPriority(  w,g)
//----------------------------------
// ScriptUI CS/CC - Modal dialog.
// Illustrates the distinctive priority of USER vs. PROGRAMMATIC events.
{
    // Global mousedown/mouseup listener.
    const ON_MOUSE = function(ev,  t)
    {
        // this :: Window
        if( (ev.target.properties||0).NoEvent ) return; // Used for the [Clear] action.
        t =  ev.timeStamp;
        t = t.getHours()+':'+t.getMinutes()+':'+t.getSeconds()+'.'+('00'+t.getMilliseconds()).slice(-3);
        this.info.text += [ev.target,ev.type,t].join(' \u2022 ')+'\r';
    };

    w = new Window('dialog',"Events Priority");
    ( w.info = w.add('panel').add('statictext',void 0,"Click anywhere... then click [Test]\r\r",{multiline:true}) )
    .preferredSize = [500,400];
    
    // Buttons: [Test] and [Clear]
    g = w.add('group', void 0, {NoEvent:1});

    g.add('button', void 0, 'Test').onClick = function(  wg,i,ev)
    {
        wg = this.window.info;
        wg.text = "Try to click the panel while the countdown is running...\r\r";
        for( i=10 ; 0 < i ; i-- )
        {
            if( 5===i ) // One internal mouse event is created at i==5
            {
                wg.text += "[" + i + "] -> Now dispatching a fake mouse event\r";
                (ev=ScriptUI.events.createEvent('MouseEvent')).initMouseEvent('mousedown');
                this.window.dispatchEvent(ev); // Triggered and handled right now, within the present loop!
            }
            else
            {
                wg.text += '[' + i + ']\r';
            }

            for( t=Date.now() ; Date.now()-t < 500 ; ); // Sleep 500ms
        }
        wg.text += '-----------------\r';
    };

    g.add('button', void 0, 'Clear',{NoEvent:1}).onClick = function()
    {
        this.window.info.text='';
    };

    // Attach the global listener to mousedown|mouseup
    w.addEventListener('mousedown', ON_MOUSE);
    w.addEventListener('mouseup', ON_MOUSE);

    w.show();
})();