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Date of registration: Apr 5th 2018

Posts: 3


Tuesday, May 15th 2018, 2:50pm

Widget reposition not working

Hi everybody,

I'm trying to create a User Interface application with the STemWin library and I'm facing a problem with the reposition of existing widgets, in particular of BUTTONs.

The "standard" structure of a window of my application is as shown:

| Top toolbar |
| E | | N |
| m | | a |
| p | | v |
| t | CENTRAL | i |
| y | | g |
| | | a |
| | | t |
| | | e |

Where there are 4 windows, all of them child of the background one.
Now, currently "TopToolbar" and "Empty" are empty windows, without any child widget, while "Navigate" has just 2 buttons that allow the user to navigate up/down in the menu.
The main window, where every relevant widget is built, is "CENTRAL" window: here I create the button I need, by setting "CENTRAL" as their parent. When created they are positioned at (0,0) of the Central window and by debugging I can see they do this correctly.

When, after having created them, I try to re-position buttons, by calling WM_SetWindowPos() on the button handler, the get somehow re-positioned, but it seems this is done with respect to the origini of the background window, not the Central window as I expected.

Googling I've found that re-drawing function, such as WM_SetWindowPos(), must be called in the callback function when WM_PAINT invoked: I've adjust my code accordingly, also setting the Central window as the active one, but nothing changes. You can see the result of re-positioning buttons in the image attached.

Hope someone can give me any advice about how to solve it.
Many thanks


Everything works well, I can create buttons with the desired size, text, ... But for some window, I need to "layout" buttons according to their number and size, after having created them and positioned them at (0,0) by default.
andrea.laini has attached the following image:
  • FullSizeRender.jpg

Date of registration: Apr 5th 2018

Posts: 3


Tuesday, May 15th 2018, 3:36pm

My fault, re-reading the user manual at the decription of WM_SetWindowPos(), I've found the trick:

"xPos New position in X in desktop coordinates.
yPosNew position in Y in desktop coordinates."