[PyQt] qwidget launching problem
Hi, If i implement my class like below: class MainWindow(QtGui.QMainWindow): def __init__(self): super(MainWindow, self).__init__() self.initUI() def initUI(): self.showButton = QtGui.QPushButton(uKlavyeyiGoster, self.mainWidget) self.showButton.resize(self.showButton.sizeHint()) self.showButton.clicked.connect(self.widgetClicked) def widgetClicked(self): self.newWidget = QtGui.QWidget(); self.newWidget.setGeometry(0, 0, 300, 300) self.newWidget.show() when i click Button, newWidget is constructed and showed. But if i change widgetClicked method like this: def widgetClicked(self): newWidget = QtGui.QWidget(); newWidget.setGeometry(0, 0, 300, 300) newWidget.show() when i clicked the button, it doesn't show anything. There are no compilation or run time errors. What is the reason of this difference? --- Enes Albay ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] qwidget launching problem
On Sun, 06 May 2012 20:25:15 +0300, Enes Albay albaye...@gmail.com wrote: Hi, If i implement my class like below: class MainWindow(QtGui.QMainWindow): def __init__(self): super(MainWindow, self).__init__() self.initUI() def initUI(): self.showButton = QtGui.QPushButton(uKlavyeyiGoster, self.mainWidget) self.showButton.resize(self.showButton.sizeHint()) self.showButton.clicked.connect(self.widgetClicked) def widgetClicked(self): self.newWidget = QtGui.QWidget(); self.newWidget.setGeometry(0, 0, 300, 300) self.newWidget.show() when i click Button, newWidget is constructed and showed. But if i change widgetClicked method like this: def widgetClicked(self): newWidget = QtGui.QWidget(); newWidget.setGeometry(0, 0, 300, 300) newWidget.show() when i clicked the button, it doesn't show anything. There are no compilation or run time errors. What is the reason of this difference? In the second version you aren't keeping a reference to the widget (either explicitly or implicitly by giving it a parent) so it is getting garbage collected when widgetClicked() returns. Phil ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] qwidget launching problem
Am Sonntag, 6. Mai 2012, 20:25:15 schrieb Enes Albay: Hi, If i implement my class like below: class MainWindow(QtGui.QMainWindow): def __init__(self): super(MainWindow, self).__init__() self.initUI() def initUI(): self.showButton = QtGui.QPushButton(uKlavyeyiGoster, self.mainWidget) self.showButton.resize(self.showButton.sizeHint()) self.showButton.clicked.connect(self.widgetClicked) def widgetClicked(self): self.newWidget = QtGui.QWidget(); self.newWidget.setGeometry(0, 0, 300, 300) self.newWidget.show() when i click Button, newWidget is constructed and showed. But if i change widgetClicked method like this: def widgetClicked(self): newWidget = QtGui.QWidget(); newWidget.setGeometry(0, 0, 300, 300) newWidget.show() when i clicked the button, it doesn't show anything. There are no compilation or run time errors. What is the reason of this difference? The difference is called Garbage Collection. In the later case the newly created object is garbage collected as sson as the method returns. You have to keep a local reference as long as the widget is needed. Regards, Detlev -- Detlev Offenbach det...@die-offenbachs.de ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] qwidget launching problem
On 05/06/2012 08:55 PM, Phil Thompson wrote: On Sun, 06 May 2012 20:25:15 +0300, Enes Albayalbaye...@gmail.com wrote: Hi, If i implement my class like below: class MainWindow(QtGui.QMainWindow): def __init__(self): super(MainWindow, self).__init__() self.initUI() def initUI(): self.showButton = QtGui.QPushButton(uKlavyeyiGoster, self.mainWidget) self.showButton.resize(self.showButton.sizeHint()) self.showButton.clicked.connect(self.widgetClicked) def widgetClicked(self): self.newWidget = QtGui.QWidget(); self.newWidget.setGeometry(0, 0, 300, 300) self.newWidget.show() when i click Button, newWidget is constructed and showed. But if i change widgetClicked method like this: def widgetClicked(self): newWidget = QtGui.QWidget(); newWidget.setGeometry(0, 0, 300, 300) newWidget.show() when i clicked the button, it doesn't show anything. There are no compilation or run time errors. What is the reason of this difference? In the second version you aren't keeping a reference to the widget (either explicitly or implicitly by giving it a parent) so it is getting garbage collected when widgetClicked() returns. Phil Thanks for your quick replies, Phil and Detlev :) ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
