Hi List,
It's me again with some QML related questions. I'm trying to call a
function in my Python code from QML UI. I followed the example called
"qmltopy2". It works OK. But I wanted more functions with the same input
parameters. I thought I only need to write a new function and then call
it from QML. But apparently this doesn't work. Please see my modified
version of the qmltopy2 example.
Is this a bug or is the behavior intended? If it's intended, how to do
it right?
And talking aout calling Python functions from QML, what about the other
way - calling a QML (JavaScript) funcion from Python? I studied the
pytoqml1 eample. It shows how to call a function of QML root object. How
do I call functions of other objects?
Thank you,
Vladimir
#!/usr/bin/python
# Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
# All rights reserved.
# Contact: PySide Team ([email protected])
#
# This file is part of the examples of PySide: Python for Qt.
#
# $QT_BEGIN_LICENSE:BSD$
# You may use this file under the terms of the BSD license as follows:
#
# "Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
# the names of its contributors may be used to endorse or promote
# products derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
# $QT_END_LICENSE$
from PySide import QtCore, QtGui, QtDeclarative
class RotateValue(QtCore.QObject):
def __init__(self):
super(RotateValue,self).__init__()
self.r = 0
# if a slot returns a value the return value type must be explicitly
# defined in the decorator
@QtCore.Slot(result=int)
def val(self):
self.r = self.r - 10
return self.r
def val2(self):
self.r = self.r + 10
return self.r
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
view = QtDeclarative.QDeclarativeView()
rotatevalue = RotateValue()
timer = QtCore.QTimer()
timer.start(2000)
context = view.rootContext()
context.setContextProperty("rotatevalue", rotatevalue)
view.setSource(QtCore.QUrl('view.qml'))
view.show()
sys.exit(app.exec_())
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: PySide Team ([email protected])
**
** This file is part of the examples of PySide: Python for Qt.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
**
****************************************************************************/
import Qt 4.7
Rectangle {
id: page
width: 500; height: 200
color: "lightgray"
Text {
id: helloText
text: "Hello world!"
anchors.horizontalCenter: page.horizontalCenter
y: 30
font.pointSize: 24; font.bold: true
}
Rectangle {
id: button
width: 150; height: 40
color: "darkgray"
anchors.left: page.left
anchors.leftMargin: 50
y: 120
MouseArea {
id: buttonMouseArea
objectName: "buttonMouseArea"
anchors.fill: parent
onClicked: {
helloText.rotation = rotatevalue.val()
}
}
Text {
id: buttonText
text: "Rotate left"
anchors.horizontalCenter: button.horizontalCenter
anchors.verticalCenter: button.verticalCenter
font.pointSize: 16;
}
}
Rectangle {
id: button2
width: 150; height: 40
color: "darkgray"
anchors.right: page.right
anchors.rightMargin: 50
y: 120
MouseArea {
id: buttonMouseArea2
objectName: "buttonMouseArea2"
anchors.fill: parent
onClicked: {
helloText.rotation = rotatevalue.val2()
}
}
Text {
id: buttonText2
text: "Rotate right"
anchors.horizontalCenter: button2.horizontalCenter
anchors.verticalCenter: button2.verticalCenter
font.pointSize: 16;
}
}
}
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