dndwidgets: add drag drop helper widgets

This commit is contained in:
Simon Renblad 2023-11-22 17:31:30 +08:00 committed by Sébastien Bourdeauducq
parent 8a9b6a449b
commit 096664c1ba
1 changed files with 98 additions and 0 deletions

98
artiq/gui/dndwidgets.py Normal file
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from PyQt5 import QtCore, QtWidgets
class VDragDropSplitter(QtWidgets.QSplitter):
def __init__(self, parent):
QtWidgets.QSplitter.__init__(self, parent=parent)
self.setAcceptDrops(True)
self.setContentsMargins(0, 0, 0, 0)
self.setOrientation(QtCore.Qt.Vertical)
self.setChildrenCollapsible(False)
def resetSizes(self):
self.setSizes(self.count() * [1])
def dragEnterEvent(self, e):
e.accept()
def dragLeaveEvent(self, e):
self.setRubberBand(-1)
e.accept()
def dragMoveEvent(self, e):
pos = e.pos()
src = e.source()
src_i = self.indexOf(src)
self.setRubberBand(self.height())
# case 0: smaller than source widget
if pos.y() < src.y():
for n in range(src_i):
w = self.widget(n)
if pos.y() < w.y() + w.size().height():
self.setRubberBand(w.y())
break
# case 2: greater than source widget
elif pos.y() > src.y() + src.size().height():
for n in range(src_i + 1, self.count()):
w = self.widget(n)
if pos.y() < w.y():
self.setRubberBand(w.y())
break
else:
self.setRubberBand(-1)
e.accept()
def dropEvent(self, e):
self.setRubberBand(-1)
pos = e.pos()
src = e.source()
src_i = self.indexOf(src)
for n in range(self.count()):
w = self.widget(n)
if pos.y() < w.y() + w.size().height():
self.insertWidget(n, src)
break
e.accept()
# Scroll area with auto-scroll on vertical drag
class VDragScrollArea(QtWidgets.QScrollArea):
def __init__(self, parent):
QtWidgets.QScrollArea.__init__(self, parent)
self.installEventFilter(self)
self._margin = 40
self._timer = QtCore.QTimer(self)
self._timer.setInterval(20)
self._timer.timeout.connect(self._on_auto_scroll)
self._direction = 0
self._speed = 10
def setAutoScrollMargin(self, margin):
self._margin = margin
def setAutoScrollSpeed(self, speed):
self._speed = speed
def eventFilter(self, obj, e):
if e.type() == QtCore.QEvent.DragMove:
val = self.verticalScrollBar().value()
height = self.viewport().height()
y = e.pos().y()
self._direction = 0
if y < val + self._margin:
self._direction = -1
elif y > height + val - self._margin:
self._direction = 1
if not self._timer.isActive():
self._timer.start()
elif e.type() in (QtCore.QEvent.Drop, QtCore.QEvent.DragLeave):
self._timer.stop()
return False
def _on_auto_scroll(self):
val = self.verticalScrollBar().value()
min_ = self.verticalScrollBar().minimum()
max_ = self.verticalScrollBar().maximum()
dy = self._direction * self._speed
new_val = min(max_, max(min_, val + dy))
self.verticalScrollBar().setValue(new_val)