QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
Clipping without using PtRaw |
| Ref. No. |
QNX.000009780 |
| Category(ies) |
Development |
| Issue |
We are trying to create a tickerbox effect where a long text label scrolls back and forth, but is clipped to a smaller rectangle. We tried using a PtClipAdd call just before widget is redrawn, but we didn't succeed.
Is there a way to clip without just using a PtRaw?
|
| Solution |
The fastest way to do this would be to set the label's text to the full string to be scrolled (with Pt_RESIZE_XY_ALWAYS set for the resize flags) and drop it onto container of some sort (PtPane or PtContainer).
In case you want to turn on Pt_RESIZE_Y_ALWAYS for the container, turn off all x-resize policies.
Using a timer you can just decrement the x value of the PtLabel's Pt_ARG_POS(starting at x = 0) and you will get the scrolling effect you are looking for. |
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