[PyQt] Drop to QTDesigner using PyQt4 question

[Mathias.MAZEL at akka.eu]

Using PyQt4 + QT4.8.4, I'd like to drop (external) textual content to a widget defined as a PyQt4 plugin in QtDesigner

I use two python classes :
- widgetlabelplugin.py inherited from QPyDesignerCustomWidgetPlugin
- widgetlabel.py inherited from QLabel

Overriding the dropEvent in (widgetlabel.py), I'm able to retrieve "external textual content" and to set _model property.

I do the following steps :
1 - Launch designer bu previously setting PYQTDESIGNERPATH to the .py path
2 - Create a dialog without button
3 - Drop a PyGMT/ WiddgetLabel on the dialog
4 - Drop a "textual content" (from notepad) to the widgetlabel label
-> at this step, the label is updated on the dialog but not on the properties browser on the right
5 - Save Dialog from Qt designer tool bar 
-> ui file doesn't contain any "textual content" neither for QLabel/text, nor WidgetLabel/model
6 - In Qt designer, If I select dialog background and reselect WidgetLabel, properties are updated in the browser, they are still not saved if I save the ui !

Thanks for your help !

----------------------------------------------------------------------------------
python class : widgetlabelplugin.py
----------------------------------------------------------------------------------
# A demonstration custom widget plugin for PROJECT Qt Designer.
from PyQt4 import QtGui, QtDesigner

from widgetlabel import WidgetLabel

# This class implements the interface expected by Qt Designer to access the
# custom widget. See the description of the QDesignerCustomWidgetInterface
# class for full details.
class WidgetLabelPlugin(QtDesigner.QPyDesignerCustomWidgetPlugin):

# Initialise the instance.
def __init__(self, parent=None):
super(WidgetLabelPlugin, self).__init__(parent)

self._initialized = False

# Initialise the custom widget for use with the specified formEditor
# interface.
def initialize(self, formEditor):
if self._initialized:
return

self._initialized = True

# Return True if the custom widget has been intialised.
def isInitialized(self):
return self._initialized

# Return a new instance of the custom widget with the given parent.
def createWidget(self, parent):
return WidgetLabel(parent)

# Return the name of the class that implements the custom widget.
def name(self):
return "WidgetLabel"

# Return the name of the group to which the custom widget belongs. A new
# group will be created if it doesn't already exist.
def group(self):
return "PyGMT"

# Return the icon used to represent the custom widget in Designer's widget
# box.
def icon(self):
return QtGui.QIcon(":/designer/frame.png")

# Return a short description of the custom widget used by Designer in a
# tool tip.
def toolTip(self):
return "Satis demonstration widget"

# Return a full description of the custom widget used by Designer in
# "What's This?" help for the widget.
def whatsThis(self):
return "WidgetLabel is a demonstration custom widget written in Python " \
"using PyQt."

# Return True if the custom widget acts as a container for other widgets.
def isContainer(self):
return False

# Return the name of the module containing the class that implements the
# custom widget. It may include a module path.
def includeFile(self):
return "WidgetLabel"

----------------------------------------------------------------------------------
python class : widgetlabel.py
----------------------------------------------------------------------------------
#############################################################################
##
## This file is part of the examples of PROJECT Qt Designer.
##
#############################################################################

from PyQt4 import QtCore, QtGui

# This is the class that implements the custom widget for PROJECT.
class WidgetLabel(QtGui.QLabel):

#model changed signal
modelChanged = QtCore.pyqtSignal(QtCore.QString)

# Initialise the instance.
def __init__(self, parent=None):
super(WidgetLabel, self).__init__(parent)
self.setAcceptDrops(True)
self.setText("Label")

# Initialise the model property. 
self._model = None

###########################################################################
# DRAG & DROP PART #

###########################################################################
def dragEnterEvent(self, e):
if e.mimeData().hasFormat("text/plain"):
e.setDropAction(QtCore.Qt.CopyAction)
e.accept()
else:
e.ignore()

def dragMoveEvent(self, event):
if event.mimeData().hasFormat("text/plain"):
event.setDropAction(QtCore.Qt.CopyAction)
event.accept()
else:
event.ignore

def dropEvent(self, e):
e.acceptProposedAction()
bStream = e.mimeData().retrieveData("text/plain",
QtCore.QVariant.ByteArray)

self.setModel(QtCore.QString(str(bStream.toByteArray())))

# The getter for the zoom property.
def getModel(self):
return self._model

# The setter for the model property. We also make define this as a Qt slot
# which can be connected to Qt signals in Qt Designer.
@QtCore.pyqtSlot(QtCore.QString)
def setModel(self, model):
# print "new model", model
# Set QLabel text
self.setText(model)

# Don't do anything if nothing has changed.
if self._model == model:
return

# Remember the new model level.
self._model = model

# Emit the Qt signal to say that the model level has changed.
self.modelChanged.emit(model)

# The resetter for the model property.
def resetModel(self):
self.setModel(None)

# Define the model property. Changing the value of this in Qt Designer's
# property editor causes the model to change dynamically.
model = QtCore.pyqtProperty(QtCore.QString, getModel, setModel, resetModel)

# Display the custom widget if the script is being run directly from the
# command line.
if __name__ == "__main__":

import sys

app = QtGui.QApplication(sys.argv)

demo = WidgetLabel()
demo.show()

sys.exit(app.exec_())

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