In the past few List digests, there's been some discussion of practical issues 
regarding when a click does or doesn't count as clicking *on* a particular 
item. So, here's a proposed addition to LiveCode…


Name: clickableRegion

Recognized abbreviation: clickReg

"clickableRegion" is a proposed property of anything in a stack that might a 
user might reasonably be expected to click on—controls, that is. We're talking 
buttons, fields, graphics, images, yada yada yada.

The clickableRegion of a control is a return-delimited list of points that 
define a region of the screen. Since clickableRegion is a property of a 
control, the engine's internal representation of these points should probably 
use the location of the control as the origin (the 0,0 point) for the 
clickableRegion's points.

Any click whose clickLoc is within the area defined by a control's 
clickableRegion, will be treated by the engine as if it were a click on that 

The default value of a control's clickableRegion should be determined by that 
control's visible-on-screen pixels—for fields, this should be the field's 
rectangle; for graphics, this should be the points of the graphic; and so on 
and so forth.

The clickableRegion property should be both get-able and set-able. If you clear 
the clickableRegion (such as by setting it to ""), it should revert back to its 
default value.

Since clickableRegion can be set to arbitrary values, it may well happen that 2 
or more controls have overlapping clickableRegions. This may not be a problem 
if the engine can simply make use of whatever magic it does when it handles 
clickLocs which fall within the rects of 2+ overlapping buttons. If the 
engine's existing 'click-disambiguation' machinery does not suffice to 
determine which control an ambiguous click is meant for, go with the control 
that has the highest-value layer property.



"Bewitched" + "Charlie's Angels" - Charlie = "At Arm's Length"
Read the webcomic at [ ]!
If you like "At Arm's Length", support it at [ ].

use-livecode mailing list
Please visit this url to subscribe, unsubscribe and manage your subscription 

Reply via email to