[DUG] Soft-Gems Virtual TreeView for a ListView

[Kyley Harris]

i think you mean, that you want to use the
MiscOptions.toGridExtensionswhich makes it behave more like a grid,
rather than a tree. There is a demo
for this.

On Nov 12, 2007 4:42 PM, Ross Levis <ross at stationplaylist.com> wrote:

>  Thanks for that.  I think I get it now.  If I define 5 columns in the
> Columns property then the component will call the OnGetText event 5 times
> for each line (node).
>
>
>
> I just have to work out what NodeData := Sender.GetNodeData(Node) does but
> there are examples for this so I should be right, thanks.
>
>
>
> Ross.
>
>
>
> *From:* delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]
> *On Behalf Of *Conor Boyd
> *Sent:* Monday, 12 November 2007 4:06 p.m.
> *To:* NZ Borland Developers Group - Delphi List
> *Subject:* RE: [DUG] Soft-Gems Virtual TreeView for a ListView
>
>
>
> The Header property of TVirtualStringTree has a Columns property.  Specify
> your columns in there.
>
>
>
> Then the OnGetText event has a Column parameter.
>
>
>
> So you can do something like this in your OnGetText event handler:
>
>
>
> procedure TFileSelectionDialog.vstFilesGetText(Sender: TBaseVirtualTree;
> Node: PVirtualNode; Column: TColumnIndex; TextType: TVSTTextType;
>   var CellText: WideString);
> var
>   NodeData : PTreeViewNodeData;
> begin
>   NodeData := Sender.GetNodeData(Node);
>
>
>
>   CellText := '';
>
>
>
>   case Column of
>     0:  CellText := ExtractFileName(NodeData.Filename);
>     1:  begin
>           if not NodeData.IsFolder then
>             CellText := DateTimeToStr(NodeData.FileDate);
>         end;
>   end;
> end;
>
> This is from when
> I wrote our own file selection dialog, since the built-in Delphi one can't cope with more than a certain number of files
>
> (if you're interested in the specifics, IIRC the number of files the
> built-in one can cope with is limited to the number of fully qualified paths
> which will fit into 32000 bytes or something - it's a problem with the
> underlying WinAPI).
>
>
>
> Hopefully that's enough to get you going.  Ask away if you've got more
> questions.
>
>
>
> HTH,
>
>
>
> Conor
>
>
>  ------------------------------
>
> *From:* delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]
> *On Behalf Of *Ross Levis
>
>
> I think someone mention they were using Virtual TreeView recently.  I
> heard that it can be made to look like a standard ListView, so I'm
> investigating it to replace a TListView in an app of mine which takes far
> too long to load up to 20,000 items.
>
>
>
> I can't use TListView in virtual mode as it seems way too difficult to
> enable sorting on columns which I need.  The Virtual TreeView appears to
> handle sorting as easy as TListView does in non-virtual mode.
>
>
>
> I'm just having difficultly working out how the use the component!  I
> realize I need to set up a record for each set of data but I can't work out
> how to add columns of data.  The examples are mostly involved with tree
> structures.
>
>
>
> I'm hoping someone can quote for me a basic piece of code for adding say 2
> items with 2 or 3 columns.
>
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-- 
Kyley Harris
Harris Software
+64-21-671-821
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