Calc2.pyw

'''
Created on 02.05.2009

@author: Boris
'''
from __future__ import division
import sys
from math import *
from PyQt4.QtCore import *
from PyQt4.QtGui import *

class Form( QDialog ):
    def __init__( self, parent = None ):
        super( Form, self ).__init__( parent )
        self.btn1 = QPushButton( "1" )
        self.btn2 = QPushButton( "2" )
        self.btn3 = QPushButton( "3" )
        self.btn4 = QPushButton( "4" )
        self.btn5 = QPushButton( "5" )
        self.btn6 = QPushButton( "6" )
        self.btn7 = QPushButton( "7" )
        self.btn8 = QPushButton( "8" )
        self.btn9 = QPushButton( "9" )
        self.btn0 = QPushButton( "0" )
        self.btnClear = QPushButton( "C" )
        self.btnDot = QPushButton( "." )
        self.btnMul = QPushButton( "*" )
        self.btnDiv = QPushButton( "/" )
        self.btnAdd = QPushButton( "+" )
        self.btnSub = QPushButton( "-" )
        self.btnEven = QPushButton( "=" )
        self.btnRp = QPushButton( ")" )
        self.btnLp = QPushButton( "(" )
        self.btnSqrt = QPushButton( "sqrt" )
        self.btnGroup = QGroupBox()
        btnlayout = QGridLayout()
        btnlayout.addWidget( self.btn7, 0, 0 )
        btnlayout.addWidget( self.btn8, 0, 1 )
        btnlayout.addWidget( self.btn9, 0, 2 )
        btnlayout.addWidget( self.btnDiv, 0, 3 )
        btnlayout.addWidget( self.btn4, 1, 0 )
        btnlayout.addWidget( self.btn5, 1, 1 )
        btnlayout.addWidget( self.btn6, 1, 2 )
        btnlayout.addWidget( self.btnMul, 1, 3 )
        btnlayout.addWidget( self.btn1, 2, 0 )
        btnlayout.addWidget( self.btn2, 2, 1 )
        btnlayout.addWidget( self.btn3, 2, 2 )
        btnlayout.addWidget( self.btnSub, 2, 3 )
        btnlayout.addWidget( self.btn0, 3, 1 )
        btnlayout.addWidget( self.btnClear, 4, 3 )
        btnlayout.addWidget( self.btnDot, 4, 2 )
        btnlayout.addWidget( self.btnAdd, 3, 3 )
        btnlayout.addWidget( self.btnRp, 3, 2 )
        btnlayout.addWidget( self.btnLp, 3, 0 )
        btnlayout.addWidget( self.btnSqrt, 4, 1 )
        btnlayout.addWidget( self.btnEven, 4, 0 )
        self.btnGroup.setLayout( btnlayout )

        self.browser = QTextBrowser()
        self.lineedit = QLineEdit()#"Type an Expression and press Enter")
        self.lineedit.selectAll()
        groupLayout = QGroupBox()
        layout = QVBoxLayout()
        layout.addWidget( self.browser )
        layout.addWidget( self.lineedit )
        groupLayout.setLayout( layout )

        mlayout = QGridLayout()
        mlayout.addWidget( groupLayout, 0, 0 )
        mlayout.addWidget( self.btnGroup, 0, 1 )

        self.setLayout( mlayout )
        self.lineedit.setFocus()
        self.connect( self.btn0, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btn1, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btn2, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btn3, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btn4, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btn5, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btn6, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btn7, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btn8, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btn9, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btnAdd, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btnDiv, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btnDot, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btnMul, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btnSub, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btnLp, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btnRp, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btnSqrt, SIGNAL( "clicked()" ), self.updateLine )
        self.connect( self.btnClear, SIGNAL( "clicked()" ), self.lineedit.clear )
        self.connect( self.btnEven, SIGNAL( "clicked()" ), self.updateUi )
        self.connect( self.lineedit, SIGNAL( "returnPressed()" ), self.updateUi )
        self.setWindowTitle( "Boris's Calculator" )


    def updateLine( self ):
        try:
            button = self.sender()
            if button is None or not isinstance( button, QPushButton ):
                return
            ltext = unicode( self.lineedit.text() )
            ltext = ltext + button.text()
            self.lineedit.setText( unicode( ltext ) )
        except:
            print ltext + "<font color=red><b> ERROR</b></font>"

    def updateUi( self ):
        try:
            text = unicode( self.lineedit.text() )
            self.browser.append( "{0} = <b>{1}</b>".format( text, eval( text ) ) )
            self.lineedit.clear()
        except:
            self.browser.append( "<font color=red>{0} is invalid!</font>"
                                .format( text ) )
app = QApplication( sys.argv )
form = Form()
form.show()
app.setStyleSheet( open( "./calc2.qss", "r" ).read() )
app.exec_()