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  • Collapsing/Expanding a treeview by programming
  • Example
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Stored procedures
Collapsing/Expanding a treeview by programming
  • To collapse a treeview by programming, all you have to do is use TreeCollapse.
  • To expand a treeview by programming, all you have to do is use TreeListItem combined with a specific local procedure.
Example
The following codes are used to:
  • initialize a TreeView control.
  • expand part of the TreeView control.
  • collapse the TreeView control.
  1. Initialize the TreeView control by programming:
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert", "CAKE-.BMP", "CAKE-.BMP")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Ice cream")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Ice cream" + ...
    TAB + "Vanilla", "NEXT5-.BMP")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Ice cream" + ...
    TAB + "Strawberry", "NEXT5-.BMP")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Ice cream" + ...
    TAB + "Chocolate", "NEXT5-.BMP")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Cup")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Cup" + ...
    TAB + "Banana Split", "NEXT5-.BMP")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Cup" + ...
    TAB + "Cherry Garcia", "NEXT5-.BMP")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Cup" + ...
    TAB + "Colonel", "NEXT5-.BMP")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Apple pie")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Apple pie" + ...
    TAB + "with whipped cream", "NEXT5-.BMP")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Apple pie" + ...
    TAB + "with apple brandy", "NEXT5-.BMP")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Crème brûlée", "NEXT5-.BMP")
    TreeAdd(TREE_RecipeTV, "Recipe" + TAB + "Dessert" + TAB + "Meringue with cream", "NEXT5-.BMP")
  2. Expand all the elements: The "ExpandAll" procedure is called for each "child" element found. This procedure expands all the collapsed "child" nodes of the "Dessert" node.
    // Lists the "children" of "Desserts" node in "TREE_RecipeTV" treeview
    // The "ExpandAll" procedure is called
    // for each "child" of "Desserts" node found
    Res = TreeListItem(TREE_RecipeTV, "Recipe" + TAB + "Dessert", "ExpandAll")
    // Local procedure named "ExpandAll"
    // This procedure expands all the collapsed "child" nodes of the "Desserts" node
    PROCEDURE ExpandAll(TREE_RecipeTV, ChildPath, ChildFound, Level, Pointer)
    // Is the element found a leaf?
    IF TreeTypeItem(TREE_RecipeTV, ChildPath + ChildFound) = tvLeaf THEN
            RETURN  // Back to TreeListItem
    ELSE
            // Is the element found collapsed?
            IF TreeStatus(TREE_RecipeTV, ChildPath + ChildFound) = tvCollapse THEN
                    TreeExpand(TREE_RecipeTV, ChildPath + ChildFound)
            END
    END
  3. Collapse the "Dessert" node.
    // Collapses the "Desserts" node in the "TREE_RecipeTV" control
    Res = TreeCollapse(TREE_RecipeTV, "Recipe" + TAB + "Dessert")
Minimum version required
  • Version 9
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