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III. Event-Handling

Chapter 11. Events

Mouse Pressed

Method signature

addActionTarget = "[String] widget name, [Constant] event,[Method] execute method"
[String] is the name of the widget
[Constant] the event to listen on
[Method] the method signature


A mousepressed event occurs when the left (or right) mouse button is pressed.

To demostrate the mousepressed event we will create a popup on a mousepressed event, and a popdown on a mousereleased event

<Widget setShape="0,0,100,80">
<Widget setShape="10,10,80,25" setLabel="Popup" setName="popup" setBorder="flat" setVisible="false"/>
<Button setShape="10,40,80,25" setLabel="Push Me" setName="pushme" addActionTarget="popup,mousepressed,setVisible='true',popup,mousereleased,setVisible='false'"/>

The Widget, 'popup', will execute the method 'setVisible'
On the mousepressed event we execute popup.setVisible="true", the Widget Pops up
On the mousereleased event we execute popup.setVisible="false", the Widget Pops down
To handle more than one event, we append them to the addActionTarget, the addActionTarget accepts parameters in tuples (3,6,9,etc...)

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