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#############################################################################
##
## Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
## Contact: Qt Software Information (qt-info@nokia.com)
##
## This file is part of the Graphics Dojo project on Qt Labs.
##
## This file may be used under the terms of the GNU General Public
## License version 2.0 or 3.0 as published by the Free Software Foundation
## and appearing in the file LICENSE.GPL included in the packaging of
## this file. Please review the following information to ensure GNU
## General Public Licensing requirements will be met:
## http://www.fsf.org/licensing/licenses/info/GPLv2.html and
## http://www.gnu.org/copyleft/gpl.html.
##
## If you are unsure which license is appropriate for your use, please
## contact the sales department at qt-sales@nokia.com.
##
## This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
## WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
##
#############################################################################
from PyQt4.QtCore import QEvent, QObject, QPoint, Qt
from PyQt4.QtGui import QMouseEvent, QWidget
class DragMoveData:
def __init__(self):
self.isMoving = False
self.startDrag = QPoint()
class DragMoveCharm(QObject):
def __init__(self, parent = None):
QObject.__init__(self, parent)
self.dragMoveData = {}
def activateOn(self, widget):
if widget in self.dragMoveData:
return
data = DragMoveData()
data.startDrag = QPoint(0, 0)
data.isMoving = False
self.dragMoveData[widget] = data
widget.installEventFilter(self)
def deactivateFrom(self, widget):
del self.dragMoveData[widget]
self.dragMoveData.remove(widget)
widget.removeEventFilter(self)
def eventFilter(self, object, event):
if not isinstance(object, QWidget):
return False
widget = object
type = event.type()
if type != QEvent.MouseButtonPress and \
type != QEvent.MouseButtonRelease and \
type != QEvent.MouseMove:
return False
if isinstance(event, QMouseEvent):
if event.modifiers() != Qt.NoModifier:
return False
button = event.button()
mouseEvent = event
try:
data = self.dragMoveData[widget]
except KeyError:
return False
consumed = False
if type == QEvent.MouseButtonPress and button == Qt.LeftButton:
data.startDrag = QPoint(mouseEvent.globalPos())
data.isMoving = True
event.accept()
consumed = True
if type == QEvent.MouseButtonRelease:
data.startDrag = QPoint(0, 0)
data.isMoving = False
if type == QEvent.MouseMove and data.isMoving:
pos = mouseEvent.globalPos()
widget.move(widget.pos() + pos - data.startDrag)
data.startDrag = QPoint(pos)
consumed = True
return consumed
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