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List: pykde
Subject: Re: [PyKDE] ANNOUNCE: IQtPy for event handling by Python's
From: Michael Lauer <mickey () tm ! informatik ! uni-frankfurt ! de>
Date: 2003-02-24 9:22:14
[Download RAW message or body]
Am Son, 2003-02-23 um 19.02 schrieb Gerard Vermeulen:
> I am using this little toy for a week and I can't miss it anymore:
> it allows me to use the standard Python interpreter running in an
> xterm/Eterm/konsole to create and control PyQt widgets, and to use
> the widgets at the same time as in a standard GUI program.
This is an interesting approach. I took a slightly different one for
my EPythonShell Widget - see the attached code.
Cheers,
--
Michael Lauer <mickey@gandalf.tm.informatik.uni-frankfurt.de>
Institute of Telematics, CS. Dept., Frankfurt University
["pythonshell.py" (pythonshell.py)]
#------------------------------------------------------------------------#
# This file is part of the ELAN environment.
# (C) 2002 Michael 'Mickey' Lauer <mickey@tm.informatik.uni-frankfurt.de>
#
# Licensed under GPL
#------------------------------------------------------------------------#
"""Implements a Python Interpreter embedded in a QMultiLineEditor"""
__revision__ = "$Revision: 1.3 $"
__author__ = "Michael Lauer <mickey@tm.informatik.uni-frankfurt.de>"
__version__ = __revision__.replace('$','').replace('Revision:','').strip()
#------------------------------------------------------------------------#
from Queue import Queue
import sys
#------------------------------------------------------------------------#
import qt
import code
import rlcompleter
#------------------------------------------------------------------------#
class EPythonShell( qt.QMultiLineEdit ):
"""An interactive Python interpreter shell embedded in a QMultiLine editor."""
class Output:
def __init__( self, writefunc ):
self.writefunc = writefunc
def write( self, line ):
if line != "\n":
map( self.writefunc, line.split("\n") )
def __init__( self, parent, localdict={} ):
qt.QMultiLineEdit.__init__( self, parent )
qt.QObject.connect( self, qt.SIGNAL( "returnPressed()" ), \
self.slotReturnPressed ) self.setFont( qt.QFont( "Fixed", 12 ) )
self.history = []
self.pointer = 0
self.cmdFromHistory = False
self.console = code.InteractiveConsole( localdict )
self.completer = rlcompleter.Completer()
self.possibleCompletions = []
# We're overriding the prompts just in case someone set up prompt coloring
sys.ps1 = ">>> "
sys.ps2 = "... "
cprt = 'Type "copyright", "credits" or "license" for more information.'
self.append( "Python %s on %s\n%s" % ( sys.version, sys.platform, cprt ) )
self.append( sys.ps1 )
self.more, self.prompt = 0, sys.ps1
self.output = EPythonShell.Output( self.writeResult )
self.stdout = sys.stdout
self.stderr = sys.stderr
self.cursorToEnd()
def isQt3( self ):
return qt.qVersion()[0] == '3'
def keyPressEvent( self, e ):
"""Intercept certain key press events and handle them to provide
command line history and attribute name completion."""
if ( e.key() == qt.Qt.Key_Up ):
if not self.pointer > 0:
return
row, col = self.getCursorPosition()
self.home()
self.killLine()
if self.pointer > 0:
self.pointer -= 1
self.append( "%s" % self.history[self.pointer] )
self.end()
self.cmdFromHistory = True
return
elif ( e.key() == qt.Qt.Key_Down ):
if not self.pointer < len( self.history )-1:
return
self.pointer += 1
row, col = self.getCursorPosition()
self.home()
self.killLine()
self.append( "%s" % self.history[self.pointer] )
self.end()
self.cmdFromHistory = True
return
elif e.key() == qt.Qt.Key_Return:
self.end()
elif e.key() == qt.Qt.Key_Tab:
row, col = self.getCursorPosition()
line = str( self.textLine( row ) )[4:]
if len( self.possibleCompletions ) == 1:
self.home()
self.killLine()
self.append( ">>> %s" % self.possibleCompletions[0] )
self.end()
else:
print >>sys.stderr, repr( self.possibleCompletions )
return
self.cmdFromHistory = False
qt.QMultiLineEdit.keyPressEvent( self, e )
def keyReleaseEvent( self, e ):
if e.key() == qt.Qt.Key_Up:
return
#
# try command line completion
#
if str( e.key() )[0] in \
"ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_.": row, col = \
self.getCursorPosition() line = str( self.textLine( row ) )[4:]
possibleCompletions = []
state = 0
if len( line ) > 1:
while True:
try:
nextCompletion = self.completer.complete( line, state )
except Exception, why:
#print >>sys.stderr, why
break
if not nextCompletion is None:
possibleCompletions.append( nextCompletion )
state += 1
else:
break
#print >> sys.stderr, "'%s': possible completions: %s" % ( line, \
repr( possibleCompletions ) ) self.possibleCompletions = possibleCompletions
qt.QMultiLineEdit.keyReleaseEvent( self, e )
def cursorToEnd( self ):
"""Move the cursor to the end of the view."""
# In Qt3, the QMultiLineEdit is derived from QTextEdit and deals in terms
# of paragraphs and no longer lines. QTextEdit.setCursorPosition() doesn't
# work as expected here, so we're faking a CTRL+END key here to achieve the
# same effect :-)
if self.isQt3():
event = qt.QKeyEvent( qt.QKeyEvent.KeyPress, qt.Qt.Key_End, 0, \
qt.Qt.ControlButton ) qt.qApp.postEvent( self, event )
else:
rows = self.numLines()
self.setCursorPosition( rows, 4 )
self.end()
def removeLastLine( self ):
self.removeLine( self.numLines()-1 )
def writeResult( self, result ):
if result == "":
return
#print >> self.stdout, "appending '%s'" % result
self.append( result )
def handleInput( self, line ):
if len( line ) > 5 and not self.cmdFromHistory:
self.history.append( line )
self.pointer = len( self.history )
sys.stdout, sys.stderr = self.output, self.output
self.more = self.console.push( line[4:] )
sys.stdout, sys.stderr = self.stdout, self.stderr
def slotReturnPressed( self ):
row, col = self.getCursorPosition()
self.removeLine( row )
line = str( self.textLine( row-1 ) )
#print "text sending to interpreter: '%s'" % line
self.handleInput( line )
if self.more:
self.prompt = sys.ps2
else:
self.prompt = sys.ps1
self.append( self.prompt )
self.cursorToEnd()
#------------------------------------------------------------------------#
if __name__ == "__main__":
a = qt.QApplication( sys.argv )
w = EPythonShell( None )
w.resize( qt.QSize( 640, 480 ) )
w.show()
a.setMainWidget( w )
a.exec_loop()
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