Previewform on Multidisplay with different DPI settings

microtronx · September 2020

Hi, we have a very crazy problem with Delphi 10.3 or 10.4 with following setup:

1. Screen with 100%
2. Screen with 125%

Mainform is started at Monitor 125%. Opening Previewform from Reportbuilder is very crazy. form is i.e. 800*500px but the area where the report is shown is only 400*250px (round about) and is showing scrollbars ....

Can you please check this asap?

microtronx · September 2020

Here's the image:

microtronx · September 2020

Problem is in ppPreview.pas in Line 1063

Viewer.Top := 2;
Viewer.Left := 2;
Viewer.Height := Viewer.Parent.Height-4;
Viewer.Width := Viewer.Parent.Width-4;
Viewer.Anchors := [akLeft, akTop, akRight, akBottom];

I removed these lines and replaced with following lines:

Viewer.AlignWithMargins:=true;
Viewer.Margins.Top:=2;
Viewer.Margins.Left:=2;
Viewer.Margins.Right:=2;
Viewer.Margins.Bottom:=2;
Viewer.Align := alclient;

Now the problems are solved!

nardmoseley · September 2020

Hi Yusuf,

Please provide steps to reproduce/test this behavior. I tried setting to 125% and calling Report.Print, but the preview form shoes correctly.

microtronx · September 2020

Hi Nard, i have nothing special setup. Possible that loading position and formsize beforeshow is the problem but changing your code so the viewer always do alClient with Margins solves that problem.

Previewform on Multidisplay with different DPI settings

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