The following example(s) require Flash Player 10 and the Adobe Flex 4 SDK. To download the Adobe Flash Builder 4 trial, see http://www.adobe.com/products/flex/. To download the latest nightly build of the Flex 4 SDK, see http://opensource.adobe.com/wiki/display/flexsdk/Download+Flex+4.
For more information on getting started with Flex 4 and Flash Builder 4, see the official Adobe Flex Team blog.

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/10/24/dispatching-custom-events-from-a-custom-component-in-flex-4/ -->
<s:Application name="Spark_Event_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009" 
        xmlns:s="library://ns.adobe.com/flex/spark" 
        xmlns:mx="library://ns.adobe.com/flex/mx"
        xmlns:comps="comps.*">
 
    <fx:Script>
        <![CDATA[
            import mx.controls.Alert;
 
            protected function btn_panicHandler(evt:Event):void {
                Alert.show("Oh noes! I has an error!!1!", evt.currentTarget.label);
            }
        ]]>
    </fx:Script>
 
    <s:HGroup horizontalCenter="0" verticalCenter="0">
        <comps:PanicButtonMXML id="panicMXML"
                label="MXML"
                height="60"
                panic="btn_panicHandler(event);" />
        <comps:PanicButtonAS id="panicAS"
                label="ActionScript"
                height="60"
                panic="btn_panicHandler(event);" />
    </s:HGroup>
 
</s:Application>

The custom PanicButtonMXML component, comps/PanicButtonMXML.mxml, is as follows:

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/10/24/dispatching-custom-events-from-a-custom-component-in-flex-4/ -->
<s:Button name="PanicButtonMXML"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx"
        chromeColor="red"
        click="doPanic(event);">
 
    <fx:Metadata>
        [Event("panic")]
    </fx:Metadata>
 
    <fx:Script>
        <![CDATA[
            public static const PANIC:String = "panic";
 
            protected function doPanic(evt:MouseEvent):void {
                dispatchEvent(new Event(PANIC));
            }
        ]]>
    </fx:Script>
 
</s:Button>

The custom PanicButtonAS component, comps/PanicButtonAS.as, is as follows:

/** http://blog.flexexamples.com/2010/10/24/dispatching-custom-events-from-a-custom-component-in-flex-4/ */
package comps {
    import flash.events.Event;
    import flash.events.MouseEvent;
    import spark.components.Button;
 
    [Event("panic")]
 
    public class PanicButtonAS extends Button {
        public static const PANIC:String = "panic";
 
        public function PanicButtonAS() {
            super();
            setStyle("chromeColor", "red");
            addEventListener(MouseEvent.CLICK, doPanic);
        }
 
        protected function doPanic(evt:MouseEvent):void {
            dispatchEvent(new Event(PANIC));
        }
    }
}

This entry is based on a beta version of the Flex 4 SDK and therefore is very likely to change as development of the Flex SDK continues. The API can (and will) change causing examples to possibly not compile in newer versions of the Flex 4 SDK.

 

Full code after the jump.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/08/04/closing-a-pop-up-window-using-the-keyboard-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="top"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            import mx.managers.PopUpManager;

            private function button_click(evt:MouseEvent):void {
                var popUpTitleWindow:PopUpTitleWindow = new PopUpTitleWindow();
                PopUpManager.addPopUp(popUpTitleWindow, this, true);
            }
        ]]>
    </mx:Script>

    <mx:Button id="button"
            label="Launch Window"
            click="button_click(event);" />

</mx:Application>

PopUpTitleWindow.mxml

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/08/04/closing-a-pop-up-window-using-the-keyboard-in-flex/ -->
<mx:TitleWindow xmlns:mx="http://www.adobe.com/2006/mxml"
        showCloseButton="true"
        styleName="noPadding"
        layout="absolute"
        width="300"
        height="200"
        creationComplete="init();"
        resize="init();"
        close="titleWindow_close(event);"
        keyDown="titleWindow_keyDown(event);">

    <mx:Style>
        .noPadding {
            paddingBottom: 0;
            paddingTop: 0;
            paddingLeft: 0;
            paddingRight: 0;
        }
    </mx:Style>

    <mx:Script>
        <![CDATA[
            import mx.core.IFlexDisplayObject;
            import mx.events.CloseEvent;
            import mx.managers.PopUpManager;

            [Bindable]
            public var source:String;

            private function init():void {
                PopUpManager.centerPopUp(this);
                this.setFocus();
            }

            private function titleWindow_close(evt:CloseEvent):void {
                PopUpManager.removePopUp(evt.target as IFlexDisplayObject);
            }

            private function titleWindow_keyDown(evt:KeyboardEvent):void {
                if (evt.charCode == Keyboard.ESCAPE) {
                    this.dispatchEvent(new CloseEvent(CloseEvent.CLOSE));
                }
            }
        ]]>
    </mx:Script>

    <mx:Label id="lbl"
            text="Press ESC to close this window."
            fontWeight="bold"
            truncateToFit="true"
            horizontalCenter="0"
            verticalCenter="0" />

    <mx:ControlBar horizontalAlign="right" width="100%">
    </mx:ControlBar>

</mx:TitleWindow>

View source is enabled in the following example.