Question:
How can I modify a TreeView item's height?
Answer:
Simply send a message TVM_SETITEMHEIGHT to the treeview control. The first parameter (word parameter, aka 'wParm') specifies the new height of every item in the tree view, measured in pixels. Note these restrictions:
this will affect all items in the treeview control
heights less than 1 will be set to 1.
if the height is not even and the tree-view control does not have the TVS_NONEVENHEIGHT style, this value will be rounded down to the nearest even value.
if the height is -1, the control will revert to using its default item height.
uses
CommCtrl;
procedure SetTreeViewItemHeight(aTreeView: TTreeView; iItemHeight: Word);
begin { SetTreeViewItemHeight }
aTreeView.Perform(TVM_SETITEMHEIGHT, iItemHeight, 0);
end; { SetTreeViewItemHeight }
procedure TForm1.Button1Click(Sender: TObject);
begin { TForm1.Button1Click }
SetTreeViewItemHeight(TreeView1, 30);
end; { TForm1.Button1Click }
//..