CODEWITHSUNDEEP
delphitreeview
HypeZ
HypeZ

Reputation: 4127

Deselect a treeview's element in delphi

I just need to deselect an item of a treeview in delphi.

Here my failed try:

1) TreeView1.Selected.Selected := False;

2) TreeView1.Selected.Data := nil;

3) TreeView1.Select(nil,[]);

4) 

  for i := 0 to TreeView1.Items.Count - 1 do  
      TreeView1.Items[i].Selected := false;

5)

  TreeView1.MultiSelect := true;
  for i := 0 to TreeView1.Items.Count - 1 do
      TreeView1.Items[i].Selected := false;
      TreeView1.MultiSelect := false;

6)

var
nulla : TTreeNode;

nulla := nil;
TreeView1.Select(nulla, []);

7) TreeView1.ClearSelection(False);

8) TreeView1.ClearSelection(True);

They ALL crash my program (except for 8, it simply doesn't do anything), how can i do this?
My goal is to simply deselect clicking on a white space.

Upvotes: 1

Views: 1848

Answers (1)

Remy Lebeau
Remy Lebeau

Reputation: 595369

Setting the TTreeView.Selected property to nil, or setting the TTreeNode.Selected property to False, is the correct approach.

1 and 2 will crash if TTreeView.Selected is already nil, but the other approaches should work fine, provided that the TTreeView pointer is a valid pointer to begin with.

Upvotes: 3

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