PyQt: create components dinamically

What to do: create some number of cells (like matrix n by m).

1) we create ScrollArea in *.ui file, and QWidget under it:

<widget class="QScrollArea" name="scrollArea">

          <property name="mouseTracking">

           <bool>true</bool>

          </property>

          <property name="verticalScrollBarPolicy">

           <enum>Qt::ScrollBarAlwaysOn</enum>

          </property>

          <property name="horizontalScrollBarPolicy">

           <enum>Qt::ScrollBarAlwaysOn</enum>

          </property>

          <property name="widgetResizable">

           <bool>true</bool>

          </property>

          <widget class="QWidget" name="contents">

           <property name="geometry">

            <rect>

             <x>0</x>

             <y>0</y>

             <width>788</width>

             <height>223</height>

            </rect>

           </property>

          </widget>

         </widget>

2) my code:

class mainWindow(QtGui.QMainWindow, UIclass.Ui_MainWindow):

    def __init__(self, win_parent = None):

        QtGui.QMainWindow.__init__(self, win_parent)

        self.setupUi(self)

        #create QGridLayout on the first start

        self.scrollArea.widget().layout = QtGui.QGridLayout()

        self.scrollArea.widget().layout.objectName='inputLayout'

        # create cells for input data

        self.connect(self.createCells, QtCore.SIGNAL("clicked()"), self.createCellsFunc)

    # function for create cells:

    def createCellsFunc(self):

        # all was doing if we know number columns and number rows

        if str(self.text1.toPlainText()).isdigit() and str(self.text2.toPlainText()).isdigit():

            # height and length for each cell

            h=25

            l=50

            # delete all old objects (exclude layout)

            for u in self.scrollArea.widget().children():

                if u.objectName!='inputLayout':

                    # "delete some later"

                    u.deleteLater()

                    # hide now

                    u.hide()

                    # set window as parent (not ScrollArea)

                    u.setParent(self)

                

            # number of columns

            hCount=int(self.text1.toPlainText())

            # number of rows

            vCount=int(self.text2.toPlainText())

            for i in range(0,hCount):

                for j in range(0,vCount):

                    # while creating insert text '0' and determine parent

                    textArea = QtGui.QTextEdit('0', self.scrollArea)

                    # we give name to the element for fast find him

                    textArea.objectName = 'a'+str(i)+'-'+str(j)

                    # dimentions

                    textArea.setMinimumSize(l,h)

                    textArea.setMaximumSize(l,h)

                    # add created element to layer of widget (textArea - adding object, (j + 1) and (i + 1) - coordinates on layer grid of adding object)

                    self.scrollArea.widget().layout.addWidget(textArea,j+1,i+1)

            # put layer to widget

            self.scrollArea.widget().setLayout(self.scrollArea.widget().layout)

            self.scrollArea.widget().layout

3) get data from cells:

            #horizontal cells count

            hCount=int(self.text1.toPlainText())

            #vertical cells count

            vCount=int(self.text2.toPlainText())

            #check for all child objects "ScrollBox": did all data is number?

            for u in self.scrollArea.findChildren(QtGui.QTextEdit):

                try:

                    float(str(u.toPlainText()))

                except:

                    self.labelWarning.setText(QtCore.QString(u'Some data is not number'))

                    return None

            

            #put data to array

            a,a0=list(),list()

            for j in range(0,vCount):

                for i in range(0,hCount):

                    for u in self.scrollArea.findChildren(QtGui.QTextEdit):

                        if u.objectName=='a'+str(i)+'-'+str(j):

                            a0.append(float(u.toPlainText()))

                a.append(a0)

                a0=list()

PyQt: show SVG

#scale increase 
self.connect(self.incScaleButton, QtCore.SIGNAL("clicked()"),lambda who="incScale": self.incScale())
 #scale decrease 
 self.connect(self.decScaleButton, QtCore.SIGNAL("clicked()"),lambda who="decScale": self.decScale())
 #create Scene for show diagrams
 self.sc=QtGui.QGraphicsScene(self.graphicsView)

 def incScale(self):
     self.scale+=0.1
     self.printGDP(scale=self.scale)

 def decScale(self):
     self.scale-=0.1
     self.printGDP(scale=self.scale)

 #show diagram: 
 filename=fileArrayt[fileNumber]
 #create object for SVG modification 
 r=QtSvg.QSvgRenderer()
 #load data 
 r.load(QtCore.QByteArray(arrayToSave))
 #change rectangle for our image 
 r.setViewBox(QtCore.QRectF(0.0, 0.0, 3200.0, 2000))
 #create additional element
 item=QtSvg.QGraphicsSvgItem()
 #put our image into it 
 item.setSharedRenderer(r)
 #change scale
 item.setScale(1.0)
 #clear Scene, change size of it 
 self.sc.clear()
 self.sc.setSceneRect(QtCore.QRectF(0.0, 0.0, 3200.0, 2000))
 #change position of item into Scene 
 item.setPos(QtCore.QPointF(10,50))
 #add item to Scene 
 self.sc.addItem(item)
 #for QGraphicsView set Scene, define "view point" 
 self.graphicsView.setScene(self.sc)
 self.graphicsView.centerOn(0,0)

PyQt: file save dialog (in windows)

make class:

class OpenFile(QtGui.QMainWindow):

   def __init__(self, parent=None):

       QtGui.QMainWindow.__init__(self, parent)

       self.setGeometry(300, 300, 350, 300)

       self.setWindowTitle('SaveFile')

       self.textEdit = QtGui.QTextEdit()

       self.setCentralWidget(self.textEdit)

       self.statusBar()

       self.setFocus()

       exit = QtGui.QAction(QtGui.QIcon('open.png'), 'Open', self)

       exit.setShortcut('Ctrl+O')

       exit.setStatusTip('Open new File')

       self.connect(exit, QtCore.SIGNAL('triggered()'), self.showDialog)

       menubar = self.menuBar()

       file = menubar.addMenu('&File')

       file.addAction(exit)

   def showDialog(self,text):

       filename = QtGui.QFileDialog.getSaveFileName(self, 'Save file', '')

       f=open(filename.toUtf8().data().decode('utf-8').encode('cp1251'),'w')

       f.write(text.toUtf8().data().decode('utf-8').encode('cp1251'))

     

in MainWindow class writing:

    def __init__(self, win_parent = None):

        ...

        #save stats in file

        self.connect(self.saveButton, QtCore.SIGNAL("clicked()"), self.saveFile)

    def saveFile(self):

        cd = OpenFile()

        cd.showDialog(self.textStatistic.toPlainText())

PyQt: pause in child thread

while (main_window.paused):

    time.sleep(1)

main_window.paused changing by current button.

PyQt: change table data => refresh headers

        #change table data => refresh headers

        self.connect(self.Station, QtCore.SIGNAL("cellPressed(int,int)"), self.updateHeader)

        self.connect(self.Train, QtCore.SIGNAL("cellPressed(int,int)"), self.updateHeader)

Python: use Psyco in PyQt4 thread

import psyco

#make function bind in thread before call it

psyco.bind(myFunc())

myFunc()

transfer data between threads in PyQt

I create signal in start function (in the other words - "wait for signal"):

self.connect(self.s1,QtCore.SIGNAL('printStat(PyQt_PyObject)'),self.printStat)

s1 - child thread;
printStat(PyQt_PyObject) - signal name, which send from thread s1 to main thread;
self.printStat  - function for our reaction by signal ( self = QMainWindow() ).

I create sending signal in child thread:

self.emit(QtCore.SIGNAL('printStat(PyQt_PyObject)'),[list of transfer vars])

I can transfer any PyQt- or/and Python-objects.

Function printStat must get transfer objects:

    def printStat(self, [list of transfer vars]):

show SVG via QGraphicsView

in class QMainWindow we create QGraphicsScene on object myGraphicsView:

self.sc=QtGui.QGraphicsScene(self.myGraphicsView)

In function for show SVG, we write:

r=QtSvg.QSvgRenderer()
r.load(QtCore.QByteArray(mySVG))
r.setViewBox(QtCore.QRectF(0.0, 0.0, 3500.0, 3500.0))
item=QtSvg.QGraphicsSvgItem()
item.setSharedRenderer(r)
item.setScale(20.0)
self.sc.clear()
self.sc.setSceneRect(QtCore.QRectF(0.0, 0.0, 2000.0, 1000.0))
item.setPos(QtCore.QPointF(10,50))
self.sc.addItem(item)
self.graphicsView.setScene(self.sc)
self.graphicsView.centerOn(0,0)

mySVG - source of the SVG-file (as text)

Picture size is 3500 by 3500 pixels.

Threads in PyQt4

I want to create threads in PyQt4 (for normal use GUI).

Make thread class:

class solveThread(QtCore.QThread):
        def run(self):
              <what do you want doing>

Check for use thread with same name and kill it if yes:

        if (hasattr(self,'s1')):
            del(self.s1)
        self.s1=solveThread()


If I want terminate thread by button, I use variable self.isExit=0 in infinite while loop (I don't use Thread.terminate() ). And I use refresh GUI each 5-10 sec (otherwise my GIU is freezing).

Python: coding in console, which make in cx_Freeze

I make console application in cx_Freeze. And I have follow error with unicode:

Traceback (most recent call last):

  File "C:\Python27\lib\site-packages\cx_Freeze\initscripts\Console.py", line 27

, in <module>

    exec code in m.__dict__

  File "carsDistrib.py", line 117, in <module>

UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-12: ordi

nal not in range(128)

# fix by set default coding:

try:

    sys.setdefaultencoding("

cp1251")

except AttributeError:

    pass

Qt: use Layout for tab in Designer

by follow steps:
- create tab
- create Layout on this tab
- delete Layout from tree of objects
- property Layout must save for this tab

On the video:
http://www.youtube.com/watch?v=8JYEdXDhrTY

PyQt4: python's class from ui-file

I create python's class always after changed of my GUI:
pyuic4 MainWindow.ui -o UIclass.py

where MainWindow.ui - file of QtDesigner, UIclass.py - python's class.

PyQt4: connect

Task: run function mySlotFunction on changing value in combobox:

There is bad idea:
self.connect(self.myComboBox, QtCore.SIGNAL("currentIndexChanged(-1)"), self.
mySlotFunction)  

There is good idea:
self.connect(self.myComboBox, QtCore.SIGNAL("currentIndexChanged(int)"), self.mySlotFunction)   

PyQt: change table headers

We can use table headers with follow:

horizontalHeaderItem ( int column ) const
verticalHeaderItem ( int column ) const

PyQt: how to track change selected cell

#if changed selected cell we print number of current row:
self.connect(self.myTableWidget, QtCore.SIGNAL("itemSelectionChanged()"), self.printCurrRow)

Python to EXE: cx_Freeze is work!

1) on windows installing cx_Freeze.

2) D:\MyProject>C:\Python27\Scripts\cxfreeze myProject_main.py --target-dir folderForExe

myProject_main.py - main file of the project (it's usually run by Python)

folderForExe - target folder for EXE and all libraries.

problem with encoding in PyQt4

Python2.7, Eric4, PyQt4 
I have follow problem:
when I send list to form for fill ComboBox: in ComboBox I see abracadabra. My coding is utf-8.

My code:
sectList=[i[0] for i in sectionsDict.items()]
print(sectList)
main_window.selectSection.addItems(sectList)

Function "print" insert for see what doing here.

Solve of the problem:
sectList=[unicode(i[0], 'cp1251') for i in sectionsDict.items()]
print(sectList)
main_window.selectSection.addItems(sectList)