Mega Code Archive
Speed Up Inserts Into TListView
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Title: Speed Up Inserts Into TListView
Question: Have you ever wondered why the screen flickers when inserting lines into a TListView?
Well, you should use the Items.BeginUpdate and Items.EndUpdate functions. These functions disallows the screen to be update when lines are inserted, thereby speeding up the process substantially.
Answer:
// In this example I have created a TListView
// called ListView1
var
ListItem : TListItem;
i : integer;
begin
ListView1.Items.BeginUpdate; // Do not update screen
try
ListView1.Items.Clear;
for i := 0 to 10000 do
begin
ListItem := ListView1.Items.Add;
ListItem.Caption := IntToStr(i);
end;
finally
ListView1.Items.EndUpdate; // Update screen
end;
end;
// In this dumb example I fill a TListView with
// 10000 numbers. You should try and run the example
// without BeginUpdate and EndUpdate and see
// the difference.
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