Previously a <condition> block was assumed to contain
a single child, and other children were ignored, largely due to the PUI code.
Most developers would expect multiple children to be evaluated
as if surrounded by an <and> block, which is how the tutorial code
behaves.
This change wraps the children in an <and> making it consistent.
This change automatically changes the view direction to look
at a <marker> if any is defined for a checklist item or tutorial
step.
Both the tutorial and checklist features support a <marker> element
which can be used by an aircraft developer to display a magenta
circle around an item of interest (typically a control in the
cockpit).
Previously aircraft developers had to add a <view> element to move
the viewpoint to look at the marker, while users of checklists had
to look for the marker manually.
Now:
- For checklists, pressing the "?" button on a checklist will pan the viewpoint
to the marker.
- For tutorials, if there is not a <view> element defined for a
tutorial step, the view will automatically pan to the marker.
Checklists now support grouping by placing a group of checklists
under a <group> node.
e.g. /sim/checklists/group/checklist
The group can have a <name>, which is used by the checklist dialog
and can be used by other interfaces, such as the FG1000.
The change introduced in commit 8c7fc119 to go to the last checklist
on open causes a problem when the first checklist has multiple pages.
If the last opened checklist did not have multiple pages, the previous
and next page buttons are still shown.
This commit runs the same binding as used by the combo box to reset
the visibility of these buttons immediately before the page is
displayed.
These are then attached to buttons on the checklist dialog allowing
the user to ask the computer to execute the checklist step, which
they can observe.
Checklists may now be split into individual sections made up
of <pages> containing the <item> tags. Each page is displayed
individually with Previous/Next buttons to allow navigation.
Checklists items also support <marker> tags. These display
a marker when a ? button is pressed next to the checklist item.
The format is identical to that of the tutorial system.
Checklist items now support a <condition> element that evaluates
when the checklist item is complete, and is used to provide color
coding in the checklist dialog.
