Usually it is some form of a message box.
It is the topmost Widget.
When it is active all other controls behind it are disabled.
There is no direct mechanism to setting a Modal dialog box in the XML GUI syntax, however
it can be emulated.
In the example above the modal box is always placed above all other widgets (so it becomes
top most). Also the Widget "modal" (the modal dialog box) starts out as invisible. An event
within the main panel would trigger the Modal to become visible and at the same time make
itself, the widget main, to be disabled.
Event to trigger modal box
Let us create an event that would display the modal box. ..
>From the example above you can see on the event action, we execute two methods.
The widget "modal" is made visible, action,modal,setVisible='true'
AND the widget "main" is disabled. action,main,setEnabled='false'
Now that we have displayed the modal box, once done (by pressing OK),
how do we re-enable the old view again?
Event to clear the modal box
Let us update the example above and add an action event or two to the modal widget.
>From the example above the 'modal' widget's actions are the exact opposite of the 'main'
The widget "modal" is made inivisible, action,modal,setVisible='false'
AND the widget "main" is enabled. action,main,setEnabled='true'