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__all__ = ["DockDrop"]
from ..Qt import QtCore, QtGui, QtWidgets
class DockDrop:
"""Provides dock-dropping methods"""
def __init__(self, dndWidget):
self.dndWidget = dndWidget
self.allowedAreas = {'center', 'right', 'left', 'top', 'bottom'}
self.dndWidget.setAcceptDrops(True)
self.dropArea = None
self.overlay = DropAreaOverlay(dndWidget)
self.overlay.raise_()
def addAllowedArea(self, area):
self.allowedAreas.update(area)
def removeAllowedArea(self, area):
self.allowedAreas.discard(area)
def resizeOverlay(self, size):
self.overlay.resize(size)
def raiseOverlay(self):
self.overlay.raise_()
def dragEnterEvent(self, ev):
src = ev.source()
if hasattr(src, 'implements') and src.implements('dock'):
#print "drag enter accept"
ev.accept()
else:
#print "drag enter ignore"
ev.ignore()
def dragMoveEvent(self, ev):
#print "drag move"
# QDragMoveEvent inherits QDropEvent which provides posF()
# PyQt6 provides only position()
width, height = self.dndWidget.width(), self.dndWidget.height()
posF = ev.posF() if hasattr(ev, 'posF') else ev.position()
ld = posF.x()
rd = width - ld
td = posF.y()
bd = height - td
mn = min(ld, rd, td, bd)
if mn > 30:
self.dropArea = "center"
elif (ld == mn or td == mn) and mn > height/3:
self.dropArea = "center"
elif (rd == mn or ld == mn) and mn > width/3:
self.dropArea = "center"
elif rd == mn:
self.dropArea = "right"
elif ld == mn:
self.dropArea = "left"
elif td == mn:
self.dropArea = "top"
elif bd == mn:
self.dropArea = "bottom"
if ev.source() is self.dndWidget and self.dropArea == 'center':
#print " no self-center"
self.dropArea = None
ev.ignore()
elif self.dropArea not in self.allowedAreas:
#print " not allowed"
self.dropArea = None
ev.ignore()
else:
#print " ok"
ev.accept()
self.overlay.setDropArea(self.dropArea)
def dragLeaveEvent(self, ev):
self.dropArea = None
self.overlay.setDropArea(self.dropArea)
def dropEvent(self, ev):
area = self.dropArea
if area is None:
return
if area == 'center':
area = 'above'
self.dndWidget.area.moveDock(ev.source(), area, self.dndWidget)
self.dropArea = None
self.overlay.setDropArea(self.dropArea)
class DropAreaOverlay(QtWidgets.QWidget):
"""Overlay widget that draws drop areas during a drag-drop operation"""
def __init__(self, parent):
QtWidgets.QWidget.__init__(self, parent)
self.dropArea = None
self.hide()
self.setAttribute(QtCore.Qt.WidgetAttribute.WA_TransparentForMouseEvents)
def setDropArea(self, area):
self.dropArea = area
if area is None:
self.hide()
else:
## Resize overlay to just the region where drop area should be displayed.
## This works around a Qt bug--can't display transparent widgets over QGLWidget
prgn = self.parent().rect()
rgn = QtCore.QRect(prgn)
w = min(30, int(prgn.width() / 3))
h = min(30, int(prgn.height() / 3))
if self.dropArea == 'left':
rgn.setWidth(w)
elif self.dropArea == 'right':
rgn.setLeft(rgn.left() + prgn.width() - w)
elif self.dropArea == 'top':
rgn.setHeight(h)
elif self.dropArea == 'bottom':
rgn.setTop(rgn.top() + prgn.height() - h)
elif self.dropArea == 'center':
rgn.adjust(w, h, -w, -h)
self.setGeometry(rgn)
self.show()
self.update()
def paintEvent(self, ev):
if self.dropArea is None:
return
p = QtGui.QPainter(self)
rgn = self.rect()
p.setBrush(QtGui.QBrush(QtGui.QColor(100, 100, 255, 50)))
p.setPen(QtGui.QPen(QtGui.QColor(50, 50, 150), 3))
p.drawRect(rgn)
p.end()
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