VirtualTreeview

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About

VirtualTreeview is a TTreeView control built from ground up.

Its main characteristics are :

• it is extremely fast. Adding one million nodes takes only ~700 milliseconds
• very small memory foot print. by only allocating about 60 bytes per node
• optimized for high speed access. It takes as few as 0.5 seconds to traverse one million nodes
• Multiselection is supported
• Drawing the entire tree to a bitmap or the printer is supported
• fixed background image can be used
• Hot style for nodes is supported
• Nodes can have individual heights
• Sorting via compare callback
• Support for unicode
• Multiple columns are supported
• ... and many more

This component was designed for cross-platform applications.

Author

Author: Mike Lischke
Old LCL Port: Joerg Thaler,Christian Ulrich
New LCL Port: Luiz Américo

License

LGPL or Mozilla Public Licence 1.1

Download

See the project releases page

Note that v5.5.3.1 is included in Lazarus v2.0+, there is not need for a separate download.

Repository

You can checkout the source code from GitHub

It's possible to use both Subversion and Git clients

Subversion:

svn co https://github.com/blikblum/VirtualTreeView-Lazarus/branches/lazarus-v5

Replace lazarus_v5 by lazarus_v4 or lazarus_master to get a different version. For more info how to use Subversion, see GitHub help

Git:

git clone https://github.com/blikblum/VirtualTreeView-Lazarus.git

Bug report / Feature request

Here

For patches / pull requests, here. Newcomers to GitHub may want to read the help

Change Log

• 02/06/2016 - 4.8.7 R4 and 5.5.3 R1 - First release of 5x branch + moved to GitHub
• 20/10/2012 - 4.8.7 LCL R2 - Compatibility with Lazarus 1.0 + 64 bit support
• 18/02/2011 - 4.8.7 LCL R1 - Sync with 4.8 branch + misc fixes
• 11/02/2010 - 4.8.6 - First stable release of the new port

Dependencies / System Requirements

Versions 4.x or 5.x

• Lazarus 1.6 or newer
• fpc 2.6.4 or newer
• LCL Extensions 0.6 or newer

Version 6.x (lazarus_master branch)

• Lazarus 1.6 or newer
• fpc 3.1 (trunk) or newer
• LCL Extensions 0.6 or newer

Installation

• If new to Lazarus, read Install Packages
• Lazarus v2.0: The lclextensions and virtualtreeview packages are contained in the standard distribution of Lazarus because they are needed by the OnlinePackageManager. Go to "Package" > "Install/uninstall packages", select "virtualtreeview_package 5.5.3.1" in the right list, click "Install selection", then "Save and rebuild IDE".
• Lazarus v2.2+ (or trunk): Like above, but the package and all units have been renamed to have a "laz." prefix, e.g. "laz.virtualtreeview_package" instead of "virtualtreeview_package" and "laz.virtualtrees" instead of "virtualtrees". The names of the registered components also begin with "Laz", e.g. "TLazVirtualStringTree" instead of "TVirtualStringTree". This was made to avoid a naming conflict when the user wants to install another version of VTV in addition to the built-in one.
• Lazarus before v2.0, or VTV version other than v5.5.3.1 (in Laz v2.0 you will have to uninstall the built-in version first):
  • Download the LCL Extensions package and extract it to a directory (lazarus\components\lclextensions or other of your preference).
  • Download the Virtual Treeview package and extract it to a directory (lazarus\components\virtualtreeview or other of your preference).
  • Open lclextensions_package.lpk in LCL Extensions directory and click "Use / Add to project"
  • Open virtualtreeview_package.lpk in Virtual Treeview and click "Use / Install". Rebuild the IDE.

Help

Can be found at VirtualTreeview Main Page (search for help in chm format).

Example code can be found here: VirtualTreeview Example for Lazarus

See also

• TTreeView