Tk Source Code

Since [ea378fca79] (TIP 740), a Button-1 press on the Treeitem.indicator element only toggles the open state of the item and does not select it.

For leaf items this makes a dead zone: they have no visible indicator, but the space it would occupy is still the indicator element, and a press there does nothing at all. With the default theme this is a 15 pixel wide strip at the left of every leaf row (after the indentation), where clicks are silently ignored:

ttk::treeview .tv -show tree
foreach i {1 2 3} {.tv insert {} end -id I$i -text "Item $i"}
pack .tv; update
set y [expr {[lindex [.tv bbox I2] 1] + 5}]
event generate .tv <Button-1> -x 6 -y $y
event generate .tv <ButtonRelease-1> -x 6 -y $y
.tv selection   ;# I2 in 8.6 and 9.0, empty in 9.1b1

In 9.0 ttk::treeview::Press selected the item and then toggled it. ttk_treeview.n says that <Button-1> "will set the focus (all modes) and selection (all except none select mode) to the item or cell under the mouse pointer".

Merged to [95fb9536b7cf7bf8|trunk], so this ticket can be closed

Yes

Thanks. The new test only checks a single click.

Added Double B1 fix and test case in [95fb9536b7cf7bf8]. Testing with the treeview demo shows it works as expected.

Thanks, single clicks in the indicator area of a leaf now select the item. DoubleClick still has the same special case: for a leaf it calls ToggleOpenState, which does nothing, so with an ActivateItem handler a double-click in that area does not activate the item. Checking [$w haschildren $item] there too would remove the dead zone completely. A test for both cases would be nice.

Fixed in [2ee8b64bd002e1eb]. I removed the dead-zone for items with no children and hence no open/close indicator. It is intentional that B1 press on the open/close indicator doesn't alter the selection. That's how other toolkits, Windows Explorer, etc. work.