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borderlayout.py
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borderlayout.py
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#!/usr/bin/env python
#############################################################################
##
## Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
##
## This file is part of the example classes of the Qt Toolkit.
##
## This file may be used under the terms of the GNU General Public
## License version 2.0 as published by the Free Software Foundation
## and appearing in the file LICENSE.GPL included in the packaging of
## this file. Please review the following information to ensure GNU
## General Public Licensing requirements will be met:
## http://www.trolltech.com/products/qt/opensource.html
##
## If you are unsure which license is appropriate for your use, please
## review the following information:
## http://www.trolltech.com/products/qt/licensing.html or contact the
## sales department at sales@trolltech.com.
##
## This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
## WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
##
#############################################################################
import sys
from PyQt4 import QtCore, QtGui
class ItemWrapper( object ):
def __init__( self, i, p ):
self.item = i
self.position = p
class BorderLayout( QtGui.QLayout ):
West, North, South, East, Center = range( 5 )
MinimumSize, SizeHint = range( 2 )
def __init__( self, parent = None, margin = 0, spacing = -1 ):
QtGui.QLayout.__init__( self, parent )
self.setMargin( margin )
self.setSpacing( spacing )
self.list = []
def __del__( self ):
l = self.takeAt( 0 )
while l:
l = self.takeAt( 0 )
def addItem( self, item ):
self.add( item, BorderLayout.West )
def addWidget( self, widget, position ):
self.add( QtGui.QWidgetItem( widget ), position )
def expandingDirections( self ):
return QtCore.Qt.Horizontal | QtCore.Qt.Vertical
def hasHeightForWidth( self ):
return False
def count( self ):
return len( self.list )
def itemAt( self, index ):
if index < len( self.list ):
return self.list[index].item
return None
def minimumSize( self ):
return self.calculateSize( BorderLayout.MinimumSize )
def setGeometry( self, rect ):
center = 0
eastWidth = 0
westWidth = 0
northHeight = 0
southHeight = 0
centerHeight = 0
QtGui.QLayout.setGeometry( self, rect )
for wrapper in self.list:
item = wrapper.item
position = wrapper.position
if position == BorderLayout.North:
item.setGeometry( QtCore.QRect( rect.x(), northHeight, rect.width(), item.sizeHint().height() ) )
northHeight += item.geometry().height() + self.spacing()
elif position == BorderLayout.South:
item.setGeometry( QtCore.QRect( item.geometry().x(), item.geometry().y(), rect.width(), item.sizeHint().height() ) )
southHeight += item.geometry().height() + self.spacing()
item.setGeometry( QtCore.QRect( rect.x(), rect.y() + rect.height() - southHeight + self.spacing(), item.geometry().width(), item.geometry().height() ) )
elif position == BorderLayout.Center:
center = wrapper
centerHeight = rect.height() - northHeight - southHeight
for wrapper in self.list:
item = wrapper.item
position = wrapper.position
if position == BorderLayout.West:
item.setGeometry( QtCore.QRect( rect.x() + westWidth, northHeight, item.sizeHint().width(), centerHeight ) )
westWidth += item.geometry().width() + self.spacing()
elif position == BorderLayout.East:
item.setGeometry( QtCore.QRect( item.geometry().x(), item.geometry().y(), item.sizeHint().width(), centerHeight ) )
eastWidth += item.geometry().width() + self.spacing()
item.setGeometry( QtCore.QRect( rect.x() + rect.width() - eastWidth + self.spacing(), northHeight, item.geometry().width(), item.geometry().height() ) )
if center:
center.item.setGeometry( QtCore.QRect( westWidth, northHeight, rect.width() - eastWidth - westWidth, centerHeight ) )
def sizeHint( self ):
return self.calculateSize( BorderLayout.SizeHint )
def takeAt( self, index ):
if index >= 0 and index < len( self.list ):
layoutStruct = self.list.pop( index )
return layoutStruct.item
return None
def add( self, item, position ):
self.list.append( ItemWrapper( item, position ) )
def calculateSize( self, sizeType ):
totalSize = QtCore.QSize()
for wrapper in self.list:
position = wrapper.position
itemSize = QtCore.QSize()
if sizeType == BorderLayout.MinimumSize:
itemSize = wrapper.item.minimumSize()
else: # sizeType == BorderLayout.SizeHint
itemSize = wrapper.item.sizeHint()
if position == BorderLayout.North or position == BorderLayout.South or position == BorderLayout.Center:
totalSize.setHeight( totalSize.height() + itemSize.height() )
if position == BorderLayout.West or position == BorderLayout.East or position == BorderLayout.Center:
totalSize.setWidth( totalSize.width() + itemSize.width() )
return totalSize
class Window( QtGui.QWidget ):
def __init__( self, parent = None ):
QtGui.QWidget.__init__( self, parent )
centralWidget = QtGui.QTextBrowser()
centralWidget.setPlainText( self.tr( "Central widget" ) )
layout = BorderLayout()
layout.addWidget( centralWidget, BorderLayout.Center )
# Qt takes ownership of the widgets in the layout when setLayout() is
# called. Therefore we keep a local reference to each label to prevent
# it being garbage collected until the call to setLayout().
label_n = self.createLabel( "North" )
layout.addWidget( label_n, BorderLayout.North )
label_w = self.createLabel( "West" )
layout.addWidget( label_w, BorderLayout.West )
label_e1 = self.createLabel( "East 1" )
layout.addWidget( label_e1, BorderLayout.East )
label_e2 = self.createLabel( "East 2" )
layout.addWidget( label_e2, BorderLayout.East )
label_s = self.createLabel( "South" )
layout.addWidget( label_s, BorderLayout.South )
self.setLayout( layout )
self.setWindowTitle( self.tr( "Border Layout" ) )
def createLabel( self, text ):
label = QtGui.QLabel( text )
label.setFrameStyle( QtGui.QFrame.Box | QtGui.QFrame.Raised )
return label
if __name__ == "__main__":
app = QtGui.QApplication( sys.argv )
window = Window()
window.show()
sys.exit( app.exec_() )