Known Problems with Icon Graphics under Windows

CSc 451, Spring 2003

Last Update: April 16, 2003, 2:01am

Problem: The pointerx and pointery attributes produce values that are frame-relative rather than canvas relative.

Solution: Subtract a fudge factor. Example:

$ifdef _MS_WINDOWS

$define XFUDGE 4

$define YFUDGE 23

$else

$define XFUDGE 0

$define YFUDGE 0

$endif

link graphics

procedure main()

    WOpen("size=300,300")

    repeat {

        x := WAttrib("pointerx") - XFUDGE

        y := WAttrib("pointery") - YFUDGE

        if not (x = \lastx & y = \lasty) then {

            WWrite("(", x, "," , y, ")")

            lastx := x

            lasty := y

            }

        WDelay(10)

        }

end

Note that the fudge factor is dependent on both which version of Windows is in use and the border width settings.

Problem: Keystroke events have an associated &x and &y that are relative to the upper left hand corner of the display screen.

Solution: Subtract posx, posy, and the abovementioned fudge factor. Example:

link graphics

$ifdef _MS_WINDOWS

$define XFUDGE 4

$define YFUDGE 23

$else

$define XFUDGE 0

$define YFUDGE 0

$endif

procedure main() # key3a

    WOpen("size=300,400")

    repeat {

        e := Event()

        WWrites(if &control then "c" else "-")

        WWrites(if &shift then "s" else "-")

        WWrites(if &meta then "m" else "-")

        x := &x; y := &y

$ifdef _MS_WINDOWS

        if type(e) == "string" then {

            x -:= WAttrib("posx") + XFUDGE

            y -:= WAttrib("posy") + YFUDGE

            }

$endif

        WWrite(" ", left(image(e),7), left("("||x||","||y||")", 12),

            right(&interval,6), "ms")

        }

end

Unicon-specific: Key events are frame relative, but need fudging. For example, on NT4SP6 the upper left corner of the drawable area is (-4,-5)

Problem: drawop=reverse does work with DrawString.

Solution: I'd like to hear a good one, but failing that... For dragging text, the original text could be drawn in the background color and a surrogate such as a box could be dragged.

Problem: Vidgets have a tiny font and there seem to be issues related to font size such as text vidgets improperly updating.

Solution: It seems that the problem can be fixed by recompiling one file. Do this:

cd X:\winicon\ipl\gprocs

wicont -c viface.icn

A subsequent build of the vidget-using program should yield a better result.

The above assumes that X:\winicon is the root directory for your Windows Icon installation.

Problem: Text vidgets don't accept keystroke input.

Workaround: This problem is apparently related to keystroke events being display-relative rather canvas-relative. If you position the window in the upper left corner of the display and put the pointer just above the vidget, the events are received. (ICK!)

Unicon-specific: As noted in another item, text events with Unicon are frame-relative. That reduces the problem to one of the minor offset mentioned ((-4,-5) for NT4SP6).