Feb 122017
 

Prompted by a post from +Attila Kovacs I have added the menu designer form (TMenuBuilder) to the list of forms which GExperts enhances. In this case, it only stores the size and optionally the position of the form.

And since I was at it, I also added several other forms:

  • TActionListDesigner
  • TFieldsEditor – used for TDataset and descendants
  • TDBGridColumnsEditor
  • TConnEditForm – the one for TAdoConnection, required to modify some controls. There is a form with the same name used for TSqlConnection, that is already sizeable.
  • TDriverSettingsForm – I don’t remember where it is used
  • TPakComponentsDlg – this is the one which shows the component list for a package, required to modify some controls

The last one pointed out a problem with the GExperts code: For whatever reason, the Delphi IDE does not destroy the form when it closes, but the form’s window handle changes every time. This messed up the code which was supposed to keep track of forms that were already managed because it compared the form’s ClassName and window handle. Since the handle changed it ended up setting the OnDestroy handler every time, saving the old handler for calling and restoring later. Unfortunately the “old handler” was GExperts’ own replacement handler for the second and all further instances, so it called itself. Boom instant stack overflow.

So I ended up completely rewriting the code. It no longer maintains a list of all managed forms. Instead, the TManagedForm class now descends from TComponent and is added to the form it enhances. This makes the code much cleaner. It also allowed me to have descendants for forms, that require special handling to become sizeable. These now have got a MakeComponentsResizable method that looks up the components on the form and changes their Anchor property so they move and size sensibly when the form gets resized.

Today I finally finished that code and found some more forms that could benefit from being sizeable:

  • TImageListEditor – Delphi 6 only, it is already sizeable in Delphi 7 and later
  • TPictureEditDlg – which is surprisingly not sizeable even in Delphi 10.1 Berlin

And last but not least, I fixed a bug in the Environment Options form of Delphi 6 and 7 where the Environment page was not correctly modified.

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