Creating a memory device with a dialog

cilmagemlu · July 10, 2023 at 8:42 AM

Hello to everyone,

I need to create a memory device with a content of a dialog window.

There was an old thread https://forum.segger.com/index.php/Thre…nter-in-window/ and undocumented function GUI_MEMDEV_CreateWindowDevice() was mentioned there.

When I use that function I get a memory device with a content of a parent window.

But how to get a memory device with a content of a whole dialog with all child widgets?

Of course we can use WM_ForEachDesc() with GUI_MEMDEV_CreateWindowDevice() for all descendants and "collect" such a content in a one device.

But maybe there is a more simple way to do this.

Thanks.

SEGGER - Schoenen · July 13, 2023 at 3:10 PM

Hi,

Unfortunately, there is no dedicated API function to copy an entire dialog into a memory device.

But, you can create a memory device with the same size as the dialog at the same position and copy the LCD content into the memory device.

This might look like this:

C

xPos  = WM_GetWindowOrgX (pMsg->hWin);
yPos  = WM_GetWindowOrgY (pMsg->hWin);
xSize = WM_GetWindowSizeX(pMsg->hWin);
ySize = WM_GetWindowSizeY(pMsg->hWin);
hMem = GUI_MEMDEV_Create(xPos, yPos, xSize, ySize);
GUI_MEMDEV_CopyFromLCD(hMem);

Attached is an example doing this.

Regards,
Sven

cilmagemlu · July 14, 2023 at 8:55 AM

Hello, Sven,

thanks for your sample, works fine, but unfortunately it is not quite suitable for me. I need to create a device from a dialog that should not be visible on the screen. In addition a dialog can contain transparency so background should not count in that case.

I attached my sample with a simple code scenario that collects all hidden dialog pixel data into a one device. Works fine except for one thing: after the dialog is shown when clicking on a child widget others widgets become hidden. I think it might be about some incomplete actions (maybe GUI context lost etc...). Maybe you can tell how to do this "icing on the cake".

Thank you.

cilmagemlu · September 11, 2023 at 9:59 AM

Hello,

for those who are interested: the problem is solved by calling

GUI_MEMDEV_FadeInWindow(WM_HBKWIN, 0);

after the dialog is shown.

In this case the main job of this function has no meaning but somehow it sets things right.

Can't explain furhter as I use STemWin and don't have source files to better understanding.

Creating a memory device with a dialog

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