Collapsing/Expanding a TreeView control through programming (prefix syntax)

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TreeView control

Collapsing/Expanding a TreeView control through programming (prefix syntax)

Collapsing/Expanding a treeview through programming

Example

See also

Associating an identifier with an element found in a TreeView control

Associating an image with the elements of a TreeView control

Collapsing/Expanding a TreeView control through programming

Collapsing/Expanding a TreeView control through programming (prefix syntax)

Events associated with TreeView controls

Handling a TreeView control at runtime

Handling a TreeView control through programming

Handling a TreeView control through programming (prefix syntax)

Handling an element found in a TreeView control through programming (prefix syntax)

Handling an element of a TreeView control programmatically

How to fill a TreeView control from a data file? (prefix syntax)

How to populate a TreeView control using a data file?

Managing duplicates in the TreeView controls

Managing duplicates in the TreeView controls (prefix syntax)

Properties associated with the rows of a TreeView control

The TreeView control

TreeView control linked to a data file

TreeView control properties

Collapsing/Expanding a treeview through programming
Example

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WINDEV Mobile

Others

See also

Collapsing/Expanding a TreeView control through programming (prefix syntax)

Collapsing/Expanding a treeview through programming

To collapse a TreeView control through programming use <TreeView>.Collapse.
To expand a TreeView through programming, use <TreeView>.ListItem with a specific local procedure.

Remark: To properly fill a TreeView control, you can use the AddChildDelayed property on the rows of the TreeView control. This property is used to define the procedure that will be run to fill the level to expand. The search for children and the fill of children are performed only when the user wants to see them.

Example

The following codes are used to:

initialize a TreeView control.
expand part of the TreeView control.
collapse the TreeView control.

Initialize the TreeView control by programming:

TREE_TVRecipe.Add("Recipe" + TAB + "Dessert", "CAKE-.BMP", "CAKE-.BMP")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Ice cream")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Ice cream" + ...
TAB + "Vanilla", "NEXT5-.BMP")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Ice cream" + ...
TAB + "Strawberry", "NEXT5-.BMP")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Ice cream" + ...
TAB + "Chocolate", "NEXT5-.BMP")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Cup")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Cup" + ...
TAB + "Banana Split", "NEXT5-.BMP")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Cup" + ...
TAB + "Cherry Garcia", "NEXT5-.BMP")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Cup" + ...
TAB + "Colonel", "NEXT5-.BMP")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Apple pie")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Apple pie" + ...
TAB + "with whipped cream", "NEXT5-.BMP")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Apple pie" + ...
TAB + "with apple brandy", "NEXT5-.BMP")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Crème brûlée", "NEXT5-.BMP")
TREE_TVRecipe.Add("Recipe" + TAB + "Dessert" + TAB + "Meringue with cream", "NEXT5-.BMP")
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_TVRecipe" treeview
// The "ExpandAll" procedure is called
// for each "child" of "Desserts" node found
Res = TREE_TVRecipe.ListItem("Recipe" + TAB+ "Dessert", "ExpandAll")

// Local procedure named "ExpandAll"
// This procedure expands all the collapsed "child" nodes of the "Desserts" node
PROCEDURE ExpandAll(TREE_TVRecipe, ChildPath, ChildFound, Level, Pointer)
// Is the element found a leaf?
IF TREE_TVRecipe.TypeItem(ChildPath + ChildFound) = tvLeaf THEN
RETURN // Back to TreeListItem
ELSE
// Is the element found collapsed?
IF TREE_TVRecipe.Status(ChildPath + ChildFound) = tvCollapse THEN
TREE_TVRecipe.Expand(ChildPath + ChildFound)
END
END
Collapse the "Dessert" node.

// Collapses the "Desserts" node in the "TREE_TVRecipe" control
Res = TREE_TVRecipe.Collapse("Recipe" + TAB + "Dessert")