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Excel add in high DPI problem

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Christian
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Christian asked on 13 Dec 2018, 08:33 AM

Hi,

Changing the size of a form at runtime somehow messes up the control size / layout if DPI / scaling ist at >100%.

This only happens if the form is loaded inside an Excel add in, if the same form is loaded in a normal WinForms project everything is fine.

Attached is a sample Excel add in project.

 

Kind regards,

Christian

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Christian
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answered on 13 Dec 2018, 08:35 AM
Sample project (rename to .zip)
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Hristo
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answered on 14 Dec 2018, 09:53 AM
Hi Christian,

Thank you for writing. I could not observe the reported behavior. I am attaching a screenshot showing the result on my end running the application on 150% scaling. Can you please try changing the RadForm with a standard form?  You can also set the RadControl.EnableDpiScaling property to false

Let me know if you need further assistance.

Regards,
Hristo
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Christian
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answered on 18 Dec 2018, 08:49 AM

Hi Hristo,

I've modified the example. (Tested with 200% scaling). Please use a slow-ish machine to test or a VM with low cpu/ram/graphic settings.

EnableDpiScaling true/false -> see attached screenshots

Using Form instead of RadForm makes a difference but the controls are still not 100% correct 

 

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Hristo
Telerik team
answered on 20 Dec 2018, 12:06 PM
Hi Christian,

Thank you for writing back.

The Excel add-in is being loaded in the run-time of Excel which is a DPI-aware application. The screenshots indicate that the layout is distorted and this can happen after the controls` sizes increase. Their locations, however, will not change and it will be necessary to change them. This can be a big task depending on how complex the layout is. A possible solution is to design your form to be auto-sized and the controls to flow. Generally anchors and using the Dock property helps. You can refer to the following articles with more information on how this can be accomplished:
Please also make sure that you are working with the Winforms designer only on machines which are at 96 DPI (100%). Otherwise, you are risking to double-scale your app in a DPI-aware environment. This is a Visual Studio issue and it is logged here: https://visualstudio.uservoice.com/forums/121579-visual-studio-ide/suggestions/7373263-winforms-designer-dpi-lock.

I hope this information is useful.

Regards,
Hristo
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