[REBOL] Event redirection within face hierachies
From: james:mustard at: 20-Jun-2004 12:15
Hi all, been reading / googling about the event datatype and its elusive
Does anyone (Cyphre?) know if there are plans to let us modify the
insides of events during event trapping? Thinking of things such as
offset redirection and action manipulation here (eg a click somewhere
elicits an alt-click elsewhere)
I have looked at the 'fake' event comments etc from the dev list but on
the whole all it seems we can do is trap and playback.
In the ideal rebol gui world this is what I expect should work:
As an example - a mapping application displaying aerial photographs.
This application uses overlays over the map data for visual cues for the
There is a contour overlay and a weather overlay
The pilot needs to be able to view both and plot a course onto a
separate course plan.
This requires the following rebol face structure (ideally)
Main application face
plan screen (acts as a point to point line drawing surface)
control overlay (contains various buttons / scrollbars to handle map
movement, visible layers etc)
As the control overlay is the topmost (active) window it is receiving
the events. If these events are not triggering a subcontrol located on
the control face then these event need to be propagated downwards to the
plan screen for final input to be analysed and acted upon. If the pilot
clicks in the control overlay this plots a point on the map - clicking
and holding the mouse down will draw a dynamic line which will get
placed once an up event is received.
Is this possible now? Am I missing something? Remember that the
control overlay face has to do pre-processing of events to determine if
a control needs to be pressed or if the event should be redirected to
the plan face..