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
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