Multiple MDI Parent Forms in a Single Application

Question

The VCL does not natively allow forms other than the MainForm to host MDI child forms. This is a hard-coded limitation on Borland's part, not a limitation in Microsoft's MDI architecture. Microsoft allows multiple windows in an application to host MDI children. There is no concept of MainForms in the Win32 API.

I have tried converting the below embarcadro c++ example to embarcadro delphi without success. I keep encountering the error "no mdi forms are currently active" when creating the mdi child forms.

This c++ sample demonstrates how to allow a non-MDI project to host multiple MDI parent forms, none of which are the VCL's MainForm.

Download with Information (Account required to download) http://cc.embarcadero.com/item/23574

Direct Download (No account required to download) http://www.delphibasics.info/MultipleMDIParentFormsInASingleApplication.zip

I would be grateful if someone would convert this sample from embarcadro c++ language to embarcadro delphi language. Thank you.

Stack Overflow is not a free conversion service. You have to try yourself and ask specific questions if you get stuck. — David Heffernan, Apr 12 '12 at 19:05
I wrote that article. If you want help converting it, post a request in the Embarcadero forums, or email me privately. — Remy Lebeau, Apr 12 '12 at 19:44
Even a single MDI parent form in an application is one too many. :-) Try using docking instead. — Warren P, Apr 12 '12 at 20:19

score 5 · Answer 1 · edited Aug 30 '19 at 03:36

5

Quality Central #12006 Hosting MDI child forms in non-MainForm forms has detailed steps in its workaround description for how to add support for that. It does involve patching the VCL sources though, and was posted against Delphi 2005, so some of the steps may have changed. It's also been closed as Won't Do, so if you pursue that approach you'll have to maintain it yourself long-term.

edited Aug 30 '19 at 03:36

Remy Lebeau

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answered Apr 12 '12 at 19:35

Zoë Peterson

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Multiple MDI Parent Forms in a Single Application

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