RE: [DUG]: Treeview wierdness
Aaron, Here's an annoying bug procedure MakeAnInvisibleTreeNode; begin Treeview.Items.BegniUpdate; TreeView.Items.Clear; TreeView.Items.endupdate; TreeView.Items.add(nil,'I''m invisible'); end; What if you move the Add into the begin/end update pair, as in: Treeview.Items.BegniUpdate; TreeView.Items.Clear; TreeView.Items.add(nil,'I''m invisible'); TreeView.Items.endupdate; Does calling Invalidate / update cause the node to be drawn? - Dennis Chuah, BE (Hons) [mailto:[EMAIL PROTECTED]] Manager, Product Development Contec Data Systems Ltd. [http://www.contecds.com] tel: +64-3-3580060 ext-775 fax: +64-3-3588045 --- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz
Re: [DUG]: Treeview wierdness
procedure MakeAnInvisibleTreeNode; begin Treeview.Items.BegniUpdate; TreeView.Items.Clear; TreeView.Items.endupdate; TreeView.Items.add(nil,'I''m invisible'); end; What if you move the Add into the begin/end update pair, as in: Whilst I haven't tried it this doesn't solve the problem since the program flow is such that we may wish to see the tree empty between the clear and the next repopulate. Treeview.Items.BegniUpdate; TreeView.Items.Clear; TreeView.Items.add(nil,'I''m invisible'); TreeView.Items.endupdate; Does calling Invalidate / update cause the node to be drawn? Tries, Repoaint, invalidate, and refresh... nothing works... Tracing the code shows that the problem seems to occur inside the wrapped MS control as opposed to borlands wrapper itself... -- Aaron Scott-Boddendijk Jump Productions (07) 838-3371 Voice (07) 838-3372 Fax --- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz
RE: [DUG]: Treeview wierdness
Aaron, Whilst I haven't tried it this doesn't solve the problem since the program flow is such that we may wish to see the tree empty between the clear and the next repopulate. OK, what about this code: SendMessage (Treeview.handle, TVM_DELETEITEM, 0, Longint(TVI_ROOT)); ... TreeView.Items.add(nil,'I''m invisible'); - Dennis Chuah, BE (Hons) [mailto:[EMAIL PROTECTED]] Manager, Product Development Contec Data Systems Ltd. [http://www.contecds.com] tel: +64-3-3580060 ext-775 fax: +64-3-3588045 --- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz
Re: [DUG]: Treeview wierdness
OK, what about this code: SendMessage (Treeview.handle, TVM_DELETEITEM, 0, Longint(TVI_ROOT)); Bummer is this confirms that borland won't be fixing the problem next release... it's a treeview fault... The sendmessage clears the tree alright but still causes the redraw as it empties which we need to avoid - users don't like waiting quite that long... if you imbed the send message in an beginupdate...endupdate... the redrawing stops... same problem as initially... fastest clear we've found so far (that doesn't exhibit the problems) is tv.Items.BeginUpdate; tv.Items.Clear; tv.Items.Add(nil,' '); tv.Items.EndUpdate; tv.Items.Clear; -- Aaron Scott-Boddendijk Jump Productions (07) 838-3371 Voice (07) 838-3372 Fax --- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz
