[PyQt] Question on QTreeView, interactive expanding/collapsing

[Paul Du Bois]

If you need hotkey+click then this is the best way I've found to do it

 

    # Implement shift-click to expand/contract

 

    @pyqtSlot(QModelIndex)

    def _on_expanded(self, index):

        if self._in_shift_press:

            self._in_shift_press = False

            _recursive_set_expanded(self, index, True)

 

    @pyqtSlot(QModelIndex)

    def _on_collapsed(self, index):

        if self._in_shift_press:

            self._in_shift_press = False

            _recursive_set_expanded(self, index, False)

 

    def mousePressEvent(self, evt):

        # Make shift-click expand/collapse all

        if int(evt.modifiers() & Qt.ShiftModifier) != 0:

            self._in_shift_press = True

        try:

            QTreeView.mousePressEvent(self, evt)

        finally:

            self._in_shift_press = False

 

def _recursive_set_expanded(view, root, desired):

    from collections import deque

    root = root.sibling(root.row(), 0)

    q = deque([root])

    model = view.model()

    while q:

        idx = q.popleft()

        view.setExpanded(idx, desired)

        for i in range(model.rowCount(idx)):

            q.append(model.index(i,0, idx))

 

From: pyqt-bounces at riverbankcomputing.com
[mailto:pyqt-bounces at riverbankcomputing.com] On Behalf Of James Polk
Sent: Tuesday, April 19, 2011 2:28 PM
To: pyqt at riverbankcomputing.com
Subject: Re: [PyQt] Question on QTreeView, interactive
expanding/collapsing

 


Whoops,...just found the *-hotkey,....nevermind, lol...



--- On Tue, 4/19/11, James Polk <jpolk5001 at yahoo.com> wrote:


From: James Polk <jpolk5001 at yahoo.com>
Subject: Question on QTreeView, interactive expanding/collapsing
To: pyqt at riverbankcomputing.com
Date: Tuesday, April 19, 2011, 2:09 PM


Greetings All,

In a typical QTreeView,...the default behaviour of clicking on a "plus
box",
i.e. the branch boxes of the tree, yields a "single box open", or in the
case
of collapsing, a "single box closed" event.

Is there any way to use a keyboard modifier, like SHIFT, CTRL, and/or
ALT,
to expand or collapse the *whole* tree?

Many other similiar tree structures in other software have this feature.
For example, holding down CTRL and ALT and clicking on any box will
unfold/expand (or collapse) all nodes/branches from that node and all
below.
Is there something I'm overlooking? Is this (re-)implementable ?

Many Thanks,
-Jim

 

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