Scrollbar without arrows

Frost · May 6th 2016, 11:29am

Hi,
I need to show a listbox widget with a vertical scrollbar, but without the arrow symbols.
Can this be achieved with pure skinning or do I need to overwrite the WM_PAINT message?

Thanks in advance!

amit251291 · May 9th 2016, 5:37am

hi Frost,
I think you need to do it by overwriting WM_PAINT of Scrollbar.. You can create your customize Scrollbar and attach it to List box widget.

Frost · May 10th 2016, 9:05am

Overwriting the WM_PAINT of the scrollbar means, I have to re-implement all functionality, that was already implemented by Segger.
Is there any reference available, how a user scrollbar callback routine has to be written?

SEGGER - Schoenen · May 11th 2016, 2:06pm

Hi Frost,

I'm afraid, simply removing the arrows from the SCROLLBAR is not possible.

But a scrollbar without arrows is almost a SLIDER widget.

For adapting the look of the SLIDER you can use skinning.
Please have a look into chapter 22 'Skinning' of the emWin user manual (UM03001_emWin5.pdf) and further to chapter 22.17 'SCROLLBAR_SKIN_FLEX'.

For a vertical slider please have a look into this sample:
segger.com/cms/admin/uploads/u…c/WIDGET_SchemeMedium.zip

Regards,
Sven

Frost · May 11th 2016, 2:17pm

Dear Sven,

thanks for the input regarding the use of sliders.
The problem is, that I would like to attach it to a listbox and in the end it should look like in the attached picture. I'm afraid it is not possible to attach a customized slider to a listbox?

YPO53 · Feb 7th 2017, 11:35am

Hello.

I have been able to remove the arrows of the scrollbar :
You have to create your own scrollbar skin :

static int _Drawscrollbar(const WIDGET_ITEM_DRAW_INFO * pDrawItemInfo) {

switch (pDrawItemInfo->Cmd)
{
case WIDGET_ITEM_GET_BUTTONSIZE :
case WIDGET_ITEM_DRAW_BUTTON_L :
case WIDGET_ITEM_DRAW_BUTTON_R :
case WIDGET_ITEM_DRAW_SHAFT :
case WIDGET_ITEM_DRAW_OVERLAP :
return 0;
default :
return SCROLLBAR_DrawSkinFlex(pDrawItemInfo);
}
}

in the WM_INIT_DIALOG :
SCROLLBAR_SetSkin(WM_GetDialogItem(pMsg->hWin, ID_SCROLLBAR_G),_Drawscrollbar);

SEGGER - Schoenen · Feb 7th 2017, 3:28pm

Hi,

YPO53 is absolutely right.

Here is also an example (attached).

Regards,
Sven

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