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Questions tagged [tvirtualstringtree]

VirtualStringTree is a Delphi component, VirtualTreeview descendant designed to make it easy to show string data.

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Ctrl+End behavior of TVirtualStringTree

When user press Ctrl+End, VirtualStringTree jumps to the end vertically which is fine but also horizontally. I don't want it to go to the end horizontally. Horizontal scroll should be leaved as is. How to tell this?
Mehmet Fide
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VirtualStringTree - Multiline Nodes and centre text vertically

If a node in a VirtualStringTree is multiline (vsMultiline in Node.States) then how can i centre the text vertically for all columns (except the multiline column) in that node? I have tried using the OnBeforeCellPaint (using TargetCanvas.TextOut())…
Simon
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Writing data to PVirtualNode without setting each field value manually

Lets say I have this node data record: Type PPerson = ^TPerson; TPerson = record Name: String; Age: Integer; SomeBool: Boolean; end; To populate my VirtualStringTree, I would do this: Procedure AddToTree(Person: TPerson); Var Node:…
Jeff
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Populating VirtualStringTree as virtually as possible?

I'm trying to populate a VirtualStringTree. My underlying data are like this, here showing 3 of many branches, each of which has a varied number of twigs. string 1 chunk:string 1, fname:c:\temp\file0.txt, freq:8 chunk:string 1,…
Mike Scott
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How to update the VirtualStringTree scrollbars?

i am having hard time to fix my problem on VirtualStringTree. I have NodeData which initially added with a Node.NodeHeight or the DefaultNodeHeight. The problem now was I'm going to change each of the NodeHeight into different size. As a result,…
XBasic3000
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Parent of RootNode of TVirtualStringTree

According to documentation, property RootNode of TVirtualStringTree is a hidden node, parent of all user created nodes. But the Parent of the RootNode is set. I am facing the following problem: Sometimes, when closing a form that have a…
Rodrigo Caetano
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Access Violation when assigning string in InitNode event of TVirtualStringTree

The given code which works without any problems in Delphi 2007. However in Delphi 2009 I am getting an exception. Access violation shows read of address $00000000. The problem exists only when assigning string, it works for numbers. Also, when I…
Wodzu
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Delphi, TVirtualStringTree, WM_SIZE events when resizing columns

I have a descendant of TVirtualStringTree class with my own autosizing columns procedure. To make it work whenever the size of the control is changed I have overriden the Resize procedure: type TMyVirtualStringTree = class(TVirtualStringTree) …
Molochnik
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How to get a number of displayed nodes in TVirtualStringTree?

I need to show a long db table in the TVirtualStringTree (e.g. 50000 records). To lower query execution time I limit the number of records with only those that are actually displayed in the tree. The code snippet of handling OnGetText is below. The…
Molochnik
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TVirtualStringTree - setting column cells/nodes Alignment

I have a VirtualStringTree with a Header.Column set to taLeftJustify (default). Is there a way to set the cells/nodes of that column to taRightJustify so that the nodes will be justified to the right, but the header column text will be justified to…
zig
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TVirtualStringTree ScaleBy Stretch

I'm Trying to get a VST to resize automatically when its Height and Width is changed. I don't have this problem with other placed VCL components, some of them have a Property "Stretch" like TImage, which lets them adjust automatically. The VST…
hzzmj
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VirtualStringTree filtering done right

I'm looking for a quick way to filter nodes in a VirtualStringTree based on a filter rule, especially when the filter rule changes. There is a filter mechanism built in the VST where you can define whether the node is filtered out. My solution right…
dominikkv
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How to drag and drop nodes from TVirtualStringTree into a VCL control with DragType dtOLE?

Is it possible to drag and drop nodes from TVirtualStringTree into a VCL control when the DragType is set to dtOLE (not dtVCL) I have a situation where I need to be able to drag nodes from one VT to another VT (dtOLE works fine), but at the same…
zig
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How to retrieve selected nodes in VirtualStringTree after selection changed?

I have VST with MultiSelect option enabled. How can I retrieve the list of selected nodes in VirtualStringTree when the selection changes via keyboard events? I tried using the below code in the OnFocusChanged event procedure…
RaelB
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Ending or Cancelling a Drag Drop Operation in a Delphi Application

I am dragging and dropping email attachments from outlook. The files are dropped into a Virtual Tree View. My import function at the end of the drag over event takes a while to process the files and it freezes the outlook application until the…
MBass
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