Develop and implement a tree control feature that appears as needed.
Wx::Perl::VirtualTreeCtrl is a powerful Perl module designed to provide a tree-like functionality equivalent to Wx::TreeCtrl, but with dynamic population of items upon expanding nodes in the tree. This control is recommended for those who require a remote source, such as a database, to populate their tree, or if the tree is very large in size.
The module implements the same interface as a standard Wx::TreeCtrl, making it easy to implement. To use this module, one must first use the syntax "use Wx::Perl::VirtualTreeCtrl 'EVT_POPULATE_TREE_ITEM';" to import the module. The following code will initialize the tree and register EVT_POPULATE_TREE_ITEM to call the AddChildren subroutine:
my $tree = new Wx::Perl::VirtualTreeCtrl($tree_ctrl);
EVT_POPULATE_TREE_ITEM($self, $tree, &AddChildren);
Once this is done, the root of the tree can be added using "$root = $tree->AddRoot($name, $data);", and expanded using "$tree->Expand($root);". The AddChildren subroutine, called by EVT_POPULATE_TREE_ITEM, will be responsible for adding and updating children of each node of the tree.
The AddChildren subroutine takes in two parameters, the self object and the event. It then proceeds to retrieve the tree object and item object, as well as the item's data. If the item already has children, it updates them. Otherwise, it adds children by processing the item's data and appending each child as an item in the tree.
This powerful module offers an efficient solution for cases where large or remote data sources make traditional tree control solutions impractical. Its intuitive interface and ability to process tree items dynamically make it a must-have for any developer looking to create dynamic tree structures in their application.
The module implements the same interface as a standard Wx::TreeCtrl, making it easy to implement. To use this module, one must first use the syntax "use Wx::Perl::VirtualTreeCtrl 'EVT_POPULATE_TREE_ITEM';" to import the module. The following code will initialize the tree and register EVT_POPULATE_TREE_ITEM to call the AddChildren subroutine:
my $tree = new Wx::Perl::VirtualTreeCtrl($tree_ctrl);
EVT_POPULATE_TREE_ITEM($self, $tree, &AddChildren);
Once this is done, the root of the tree can be added using "$root = $tree->AddRoot($name, $data);", and expanded using "$tree->Expand($root);". The AddChildren subroutine, called by EVT_POPULATE_TREE_ITEM, will be responsible for adding and updating children of each node of the tree.
The AddChildren subroutine takes in two parameters, the self object and the event. It then proceeds to retrieve the tree object and item object, as well as the item's data. If the item already has children, it updates them. Otherwise, it adds children by processing the item's data and appending each child as an item in the tree.
This powerful module offers an efficient solution for cases where large or remote data sources make traditional tree control solutions impractical. Its intuitive interface and ability to process tree items dynamically make it a must-have for any developer looking to create dynamic tree structures in their application.
What's New
Version 1.017: N/A