Hello to all,

I need to scroll a Listview by swiping. I use emWin 6.32.
So I tried this example:
SCROLLER_Usage_DefaultWidgets.c kb.segger.com/SCROLLER_-_Usage_DefaultWidgets_(Sample)

Because my resolution is 800*480 I extended the dummy text for the Listview, so defintely not all the lines fit on the screen.
Thus a scrollbar IS NECESSARY.
Swiping directly on the listview workes fine, but the attached Scroller is not displayed.
The example code is 1:1 copied!
In order to find the reason I modified the code and tried to create a scrollbar manually with SCROLLER_CreateUser(). This scroller is displayed.
But as soon as a use SCROLLER_AttachToWindow() with the handle of the scroller (manually created), the scroller disapears.
Why is the scroller in this context not capable to work together with a Listview?

Thanks a lot for help
Andreas

Hello,

I found a similar example: kb.segger.com/SCROLLER_-_Custom_(Sample)
which is identical, but has an OwnerDraw routine for the scroller.
Thus I wanted to find out with a breakpoint in the routine why the scroller is not drawn.

The ownerdraw function is called twice.
first:
command: 0x05 WIDGET_ITEM_DRAW_BACKGROUND
Itemindex: 0x01 SCROLLER_CI_INACTIVE


second:
command: 0x01 WIDGET_ITEM_DRAW
Itemindex: 0x01 SCROLLER_CI_INACTIVE

I added these functions:

SCROLLER_SetBkColor(hScroller,SCROLLER_CI_INACTIVE,GUI_RED);
SCROLLER_SetBkColor(hScroller,SCROLLER_CI_ACTIVE,GUI_RED);

But still the scroller is not drawn.


Very irritating...


Please help

Andreas

The coordinates of pInfo Rectangle are:
pInfo->x0 84
pInfo->y0 -12 (0xFFFFFFF4)
pInfo->x1 404
pInfo->y1 4

These numbers do not change if I change the dimensions of the parent Window (ListView).
So they are not related to the parent at all, even though the scroller should be attached to the right edge...
If these numbers are supposed to be positive only that would be an explanation why the rectangle can not be drawn...

I finally found the solution:

SCROLLER_SetSize(hScroller,20);

and the scroller is displayed.
I just don´t know why this helps.
Found it with hours of try & error...

Andreas