问题
I have problems with auto-scaling of controls on my form for different monitor DPI settings. Rad Studio 10.2 Tokio. "Enable high-dpi" is on. I set the form's PixelsPerInch to 96 at design time. I put TPageControl on a form, create a TTabSheet page in it, put some controls on a page and set their Anchor property to akRight (in addition to akLeft and akTop). When the program is run on a monitor with a resolution of 120 DPI right edge of those controls appear extended beyond the right boundary of PageControl, so that the right parts of controls are not visible. If I switch off the akRight, then the controls are scaled correctly. But I need those anchors to resize form correctly at run time. How to solve the problem?
PS The bug was fixed in Rad Studio 10.3
回答1:
C++ Builder Help for TFont says:
The PixelsPerInch property affects printer fonts only and should not be modified.
To modify the size of a font, use the Size or Height properties.
回答2:
I was facing the same problem with an application owning myriads of TPageControl's with TEdit's, TMemo's and other misaligned controls in high-dpi mode.
My first approach to solve this was an attempt to pass the TForm to a procedure called FixFormScaling(), where I intended to fix all buggy scaling stuff. But I failed greatly, due to having many different alignments of the contained controls, which I could not handle reasonably in one short procedure.
The second approach seems to work: On each TTabSheet, I am placing a TPanel with the following properties:
Align=alClient
BevelOuter=bvNone
Name=pnlDpiHelper<NameOfTabsheet>
ShowCaption=False
I am moving all other controls (TEdit, TMemo, etc.) onto that TPanel. The result in high-dpi mode is that everything seems to be scaled correctly now!
来源：https://stackoverflow.com/questions/48370423/wrong-auto-scaling-controls-with-anchors-on-pagecontrol-in-vcl-form