PUI: Difference between revisions

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56 bytes added ,  9 October 2017
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== Background ==
== Background ==
In FlightGear, PUI dialogs are standard [[PropertyList XML File]]s that are stored in $FG_ROOT/gui/dialogs, they can contain the widgets mentioned in {{readme file|gui}}, using a simple layout engine discussed in {{readme file|layout}}, and bindings using a combination of so called fgcommands (see {{readme file|commands}}) and custom [[Nasal]] code. In addition, each PUI/XML dialog may contain Nasal sections that are executed when opening/closing the dialog, a feature which is commonly used for procedurally creating/updating widgets using the cmdarg() API, which allows the dialog tree to be traversed and manipulated prior to the dialog being rendered.
In FlightGear, PUI dialogs are standard [[PropertyList XML File]]s that are stored in $FG_ROOT/gui/dialogs, they can contain the widgets mentioned in {{readme file|gui}}, using a simple layout engine discussed in {{readme file|layout}}, and bindings using a combination of so called fgcommands operating on properties (see {{readme file|commands}}) and custom [[Nasal]] (FlightGear scripting) code.  
 
In addition, each PUI/XML dialog may contain Nasal script sections that are executed when opening/closing the dialog, a feature which is commonly used for procedurally creating/updating widgets using the cmdarg() API, which allows the dialog tree to be traversed and manipulated prior to the dialog being rendered.
Widgets can be conditionally hidden/shown using a wrapper for SGCondition in props.nas  
Widgets can be conditionally hidden/shown using a wrapper for SGCondition in props.nas  
The <code>canvas</code> widget also supports its own embedded Nasal code section to execute arbitrary widget specific Nasal code upon opening/closing the dialog/widget.
The <code>canvas</code> widget also supports its own embedded Nasal code section to execute arbitrary widget specific Nasal code upon opening/closing the dialog/widget.

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