UltraCheckEditor doesn't resize correctly in FlowLayoutPanel under high DPI

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Scott English posted over 6 years ago

When I create a DPI aware app with a FlowLayoutPanel that contains several auto-sizing UltraCheckEditors, it works as expected on a system with 100% font scaling. On a high DPI system (Windows 10, 175% font scaling), the UltraCheckEditors don't resize correctly. The text in the editors wraps (because it didn't size itself correctly), which results in two lines of text, with both lines clipped because they extend above and below the control area.

Got a fix?

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4625

Offline Ivaylo Petrov posted over 6 years ago

Hi Scott,

We have made improvements regarding the UltraCheckEditor DPI awareness in 14.2 and up. Could you let me know the Infragistics` version you use? While I am investigating this issue further, could you please send me reproducible sample application? It would definitely help me narrow down what is going on faster.

Looking forward to hear from you.
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140

Offline Scott English posted over 6 years ago in reply to Ivaylo Petrov

Attached is a sample app.

CheckboxResizeUnderHighDPI.zip
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4625

Offline Ivaylo Petrov posted over 6 years ago in reply to Scott English

Hi Scott,

Thank you for the sample!

I submitted this issue in our internal development tracking system under 242942. It is currently assigned to our development team and to follow up with the progress about it, you can check out the support activity tab at https://www.infragistics.com/my-account/support-activity

Let me know if I may assist you further on this matter.
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140

Offline Scott English posted over 6 years ago in reply to Ivaylo Petrov
I did discover some workarounds.

In the sample app I provided, I have since added an event handler for the form's Shown event. Here I call Refresh() and PerformLayout() on the flow panel. This causes each checkbox to paint itself and then redo its layout, at which point it resizes correctly. It appears that something in the painting of the control causes it to update the info it needs to resize itself correctly the next time it does a layout.

However, this only works for checkboxes that are currently displayed. In our actual app, the flow layout panel is inside a larger scrollable container, and some of the checkboxes are initially off screen. Since they aren't displayed, calling Refresh() on either the panel or on the checkbox itself doesn't make a difference. Instead, I had to hook into the Paint event of each checkbox and call PerformLayout on the checkbox at that time. This significantly slows down the process of painting checkboxes when they initially scroll into view since the containing panel has to redo its layout every time a checkbox resizes itself.
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