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Bug 2467

Summary:	TeeEditor tabs don't refresh display - NOT a Steema bug
Product:	VCL TeeChart	Reporter:	John Santmann <JSantmann>
Component:	Editors	Assignee:	yeray alonso <yeray>
Status:	RESOLVED NOTABUG
Severity:	major	CC:	yeray
Priority:	High
Version:	32.210430
Target Milestone:	---
Hardware:	PC
OS:	Windows
Chart Series:	---	Delphi / C++ Builder RAD IDE Version:	RAD 10.3 Rio
Attachments:	Zip file has screenshot of error and source code for simple application that reproduces error Trying to reproduce the problem with RAD 10.3 Update 3 and TeeChart v2021.33

Description John Santmann 2021-10-15 18:54:28 EDT

Created attachment 985 [details]
Zip file has screenshot of error and source code for simple application that reproduces error

Tested with 33.210916, but it was also seen in earlier versions. 
Delphi version 10.3 update 1.
Windows 10

Clicking the various tabs in the editor display (e.g. chart, series, data, animations, export and print) do not consistently refresh the display. Sometimes the new display appears on top of the previous display. This has been happening in my production release for months, if not years and was easily reproduced with a simple test application; source code attached.

Thanks for looking into this.

- John

John Santmann MD
Cell - 732.995.9350 (USA)
jsantmann@wellsoft.com

Comment 1 yeray alonso 2021-10-18 04:38:19 EDT

Created attachment 986 [details]
Trying to reproduce the problem with RAD 10.3 Update 3 and TeeChart v2021.33

I've tried to reproduce this with your project and TeeChart Pro VCL v2021.33, both with RAD 11 and RAD 10.3 Update 3, without observing any problem.

Comment 2 John Santmann 2021-10-22 10:53:00 EDT

THIS IS NOT A Steema BUG.
Thanks for your quick response. It was very helpful in enabling me to pinpoint the problem.
In case you're interested, it was the result of a change I made to the Delphi compiler source code years ago to prevent screen flickering. The change was:

procedure TWinControl.CMShowingChanged(var Message: TMessage);
const
  ShowFlags: array[Boolean] of Word = (
    SWP_NOSIZE + SWP_NOMOVE + SWP_NOZORDER + SWP_NOACTIVATE + SWP_HIDEWINDOW,
    SWP_NOSIZE + SWP_NOMOVE + SWP_NOZORDER + SWP_NOACTIVATE + SWP_SHOWWINDOW +
    SWP_NOREDRAW);             // This line helps prevent flickering in general (mostly pre-Windows 10), but causes refresh problem with TChart editor display.
begin
  SetWindowPos(WindowHandle, 0, 0, 0, 0, 0, ShowFlags[FShowing]);
end;

Comment 3 yeray alonso 2021-10-25 04:00:53 EDT

Thanks for the feedback!