Hello,
i attatched a small example, if you need more informations just mail me.
Am Dienstag 08 September 2009 13:03:01 schrieben Sie:
> hi, thanks!i'm interested in what you said about the event filter. i don't
> like having to subclass some things while for other things i can just use
> signals. i'm thinking that depending on how this "event filter" thing
> works, maybe i could make a convenience function using it that will allow
> me to treat any event handler like a signal..!
Yes, that should be possible (havn't tried it myself).
You only have to install a event filter for all widgets you want to get the
events and emit a signal in the eventFilter method.
>
> On Tue, Sep 8, 2009 at 6:19 AM, Lukas Hetzenecker <[email protected]> wrote:
> > Hello,
> >
> > > The documentation for keyPressEvent for a QTextEdit says
> > >
> > > This function is called with key event *e* when key presses occur. It
> > > handles PageUp, PageDown, Up, Down, Left, and Right, and ignores all
> >
> > other
> >
> > > key presses.
> >
> > Hm, i don't know why the documentation says this, but it works for me.
> > Maybe
> > the implemention for QWidget is used
> > (http://qt.nokia.com/doc/4.5/qwidget.html#keyPressEvent )
> >
> > I did the same in my project:
> > http://series60-remote.svn.sf.net/viewvc/series60-
> > remote/trunk/pc/widget/MessageTextEdit.py?view=markup
> >
> > You can replace self.emit(SIGNAL("sendMessage")) by self.clear().
> >
> > I subclassed QTextEdit and overwrote the keyPressEvent
> > It's even possible to include this widget in Qt Designer - do you need an
> > example for this?
> >
> > An alternative would be to install an event filter on your QWidget
> > (Dialog, MainWindow or whatever...), so you don't have to subclass
> > QTextEdit and you get the events for the text edit too - I could provide
> > you an example if you
> > want.
> >
> > http://series60-remote.svn.sf.net/viewvc/series60-
> > remote/trunk/pc/widget/MessageTextEdit.py?view=markup
> >
> > #!/usr/bin/env python
> > # -*- coding: utf-8 -*-
> >
> > # Copyright (c) 2008 - 2009 Lukas Hetzenecker <[email protected]>
> >
> > from PyQt4.QtCore import *
> > from PyQt4.QtGui import *
> >
> > class MessageTextEdit(QTextEdit):
> > def __init__(self, parent):
> > super(MessageTextEdit, self).__init__(parent)
> >
> > self.parent = parent
> > self.__sendMessageOnReturn = False
> >
> > def sendMessageOnreturn(self):
> > return self.__sendMessageOnReturn
> >
> > def setSendMessageOnReturn(self, state):
> > self.__sendMessageOnReturn = state
> >
> > def keyPressEvent(self, event):
> > if self.__sendMessageOnReturn:
> > if event.key() == Qt.Key_Return:
> > if event.modifiers() == Qt.ControlModifier:
> > event = QKeyEvent(QEvent.KeyPress, Qt.Key_Return,
> > Qt.NoModifier)
> > else:
> > self.emit(SIGNAL("sendMessage"))
> > return
> >
> > QTextEdit.keyPressEvent(self, event)
> >
> >
> > Lukas
> >
> > Am Dienstag 08 September 2009 07:55:40 schrieb inhahe:
> > > The documentation for keyPressEvent for a QTextEdit says
> > >
> > > This function is called with key event *e* when key presses occur. It
> > > handles PageUp, PageDown, Up, Down, Left, and Right, and ignores all
> >
> > other
> >
> > > key presses.
> > > i guess that means if i want to react to a user pressing Enter they're
> >
> > not
> >
> > > making it easy for me?
> > > i thought maybe i could handle the textChanged event and then grab the
> > > current state of the keyboard to see if Enter is pressed, but I don't
> > > even see a function to check the keyboard state.
> > > so what's the best way to do this?
> > > do I have to use QAction in some way?
> > >
> > > what i want to do specifically is create an edit box where pressing
> > > shift+enter works like pressing enter but pressing enter alone calls a
> > > function which clears the text, etc. just like how an AIM input box
> >
> > works.
> >
> > > thanks.
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys
class Widget(QWidget):
def __init__(self, parent=None):
super(Widget, self).__init__(parent)
# Create a Text edit widget and lay it out...
self.textedit = QTextEdit()
self.layout = QVBoxLayout(self)
self.layout.addWidget(self.textedit)
self.setLayout(self.layout)
# Install an event filter for the QTextEdit
self.textedit.installEventFilter(self) # all events will call self.eventFilter(self.textedit, event)
def eventFilter(self, obj, ev): # http://qt.nokia.com/doc/4.5/qobject.html#eventFilter
if ev.type() == QEvent.KeyPress: # List of events: http://qt.nokia.com/doc/4.5/qevent.html#Type-enum
print "Pressed key: " + str(ev.key()) + " in widget " + str(obj)
# If we return True, it's not possible to enter text in the TextEdit.
# It's possible to check if event.key() == Qt.Key_Return and then return True and emit a signal, otherwise return False
# From the documentation:
# In your reimplementation of this function, if you want to filter the
# event out, i.e. stop it being handled further, return true; otherwise return false.
return True
QWidget.eventFilter(self, obj, ev)
return False
app = QApplication(sys.argv)
widget = Widget()
widget.show()
sys.exit(app.exec_())
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