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	mikec	2010-03-06 , 16:11
	Posts: 1,366 \| Thanked: 1,185 times \| Joined on Jan 2006	#1

Hi Guys

I have over 100 QpushButtons in a gridlayout, and I want to set the toggle state of all of them to the same state.

Any clues how I can do this short of writing this statement 100 times
self.pushButton1.setChecked(0)
.
.
.
self.pushButton100.setChecked(0)

Cheers

Mike C

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Last edited by mikec; 2010-03-06 at 19:33.

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hartti	2010-03-07 , 05:54
Posts: 77 \| Thanked: 52 times \| Joined on Sep 2009 @ US	#2

Maybe (most likely?) I am missing something obvious, but why don't you use array of push buttons and iterate through them in a loop?

Hartti

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	mikec	2010-03-07 , 08:35
	Posts: 1,366 \| Thanked: 1,185 times \| Joined on Jan 2006	#3

Originally Posted by hartti

Maybe (most likely?) I am missing something obvious, but why don't you use array of push buttons and iterate through them in a loop?

Hartti

that is exactly what i want to do, how does one refer to the object names in a loop? the object names have been given by qt designer.

also i thought there might be a more clever way, ie changing the
property of all instances of QpushButton.

thanks in advance

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	pelago	2010-03-07 , 10:29
	Posts: 2,121 \| Thanked: 1,540 times \| Joined on Mar 2008 @ Oxford, UK	#4

Originally Posted by mikec

the object names have been given by qt designer.

I'm not an expert, but it might be that creating these buttons one-by-one in Qt Designer wasn't the best thing to do. If you create them in code instead, in an array as mentioned, you should be able to control them easier.

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attila77	2010-03-07 , 10:44
Posts: 3,319 \| Thanked: 5,610 times \| Joined on Aug 2008 @ Finland	#5

Pelago is right. However, since you already did it the other way, you're probably looking for the eval function, something like

eval("pushButton%s.setChecked(0)" % i)

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	mikec	2010-03-07 , 11:10
	Posts: 1,366 \| Thanked: 1,185 times \| Joined on Jan 2006	#6

Thanks Atilla and Pelago

I will give the eval function a try, sounds like exec() might also be useful.

Is there no way to globally set QpushButton attributes?
for instance I can change the style of QpushButtons globally with a single method

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attila77	2010-03-07 , 15:27
Posts: 3,319 \| Thanked: 5,610 times \| Joined on Aug 2008 @ Finland	#7

Originally Posted by mikec

Thanks Atilla and Pelago

I will give the eval function a try, sounds like exec() might also be useful.

Is there no way to globally set QpushButton attributes?
for instance I can change the style of QpushButtons globally with a single method

Style or attribute ? 'Cause those are two very different things

If you maintain parent-child relations or a wrapper class you could of course make things easier.

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	mikec	2010-03-09 , 19:32
	Posts: 1,366 \| Thanked: 1,185 times \| Joined on Jan 2006	#8

ok just to close close this thread off.

Could not get Eval() to work but Exec() worked well , but I decided to rewrite the app using an array of buttons populated from within the application. This was non trivial cause of python arrays peculiarities but here is the code snippet for future ref.

This creates an 8x16 array of buttons in an array declared inside the Qt MainWindow Class (this avoids the use of globals, don't even go there

)

Code:

#Here is the MainWindow Class with an array called ledArray declared.
class MainWindow(QMainWindow, Ui_MainWindow):
    ledArray=[]
    def __init__(self, parent = None):
          QMainWindow.__init__(self, parent)
           self.setupUi(self)

Here is the initialization routine to create the array of buttons in the Main.py and inserts them into the UI created by Qt Designer, where I had placed a grid layout in the main window to accept my buttons, all pre-styled to look nice.

Code:

def initled():        
        for r in range(8): 
            MainWindow.ledArray.append([])
            for c in range(16):
                    MainWindow.ledArray[r].append(QtGui.QPushButton())
                    MainWindow.ledArray[r][c].setCheckable(True) 
                    MainWindow.ledArray[r][c].setMinimumSize(QtCore.QSize(45, 45)) 
                    ui.gridLayout.addWidget(MainWindow.ledArray[r][c], r, c)

And I can change all attributes at once now with loop.

Code:

for r in range(8): 
            for c in range(16):
                self.ledArray[r][c].setChecked(self.ledState)

and here is the result

Mike C

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Last edited by mikec; 2010-03-10 at 10:53.

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	noobmonkey	2010-03-09 , 19:37
	Posts: 3,203 \| Thanked: 1,391 times \| Joined on Nov 2009 @ Worthing, England	#9

Originally Posted by mikec

ok just to close close this thread off.

Could not get Eval() to work but Exec() worked well , but I decided to rewrite the app using an array of buttons populated from within the application. This was non trivial cause of python arrays peculiarities but here is the code snippet for future ref.

This creates an 8x16 array of buttons in an array declared inside the Qt MainWindow Class (this avoids the use of globals, don't even go three )
Code:
#Here is the MainWindow Class with an array called ledArray declared.
class MainWindow(QMainWindow, Ui_MainWindow):
    ledArray=[]
    def __init__(self, parent = None):
          QMainWindow.__init__(self, parent)
           self.setupUi(self)
Here is the initialization routine to create the array of buttons in the Main.py and inserts them into the UI created by Qt Designer, where I had placed a grid layout in the main window to accept my buttons, all pre-styled to look nice.
Code:
def initled():        
        for r in range(8): 
            MainWindow.ledArray.append([])
            for c in range(16):
                    MainWindow.ledArray[r].append(QtGui.QPushButton())
                    MainWindow.ledArray[r][c].setCheckable(True) 
                    MainWindow.ledArray[r][c].setMinimumSize(QtCore.QSize(45, 45)) 
                    ui.gridLayout.addWidget(MainWindow.ledArray[r][c], r, c)
And I can change all attributes at once now with loop.
Code:
for r in range(8): 
            for c in range(16):
                self.ledArray[r][c].setChecked(self.ledState)
and here is the result

Mike C

that rocks!!!!!

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attila77	2010-03-12 , 12:06
Posts: 3,319 \| Thanked: 5,610 times \| Joined on Aug 2008 @ Finland	#10

Originally Posted by mikec

Code:

def initled():        
        for r in range(8): 
            MainWindow.ledArray.append([])
            for c in range(16):
                    MainWindow.ledArray[r].append(QtGui.QPushButton())
                    MainWindow.ledArray[r][c].setCheckable(True) 
                    MainWindow.ledArray[r][c].setMinimumSize(QtCore.QSize(45, 45)) 
                    ui.gridLayout.addWidget(MainWindow.ledArray[r][c], r, c)

Great stuff ! Two notes, though (not as discouragement, just as advices):

Avoid things like MainWindow.ledArray[r].append(QtGui.QPushButton())

The problem is that Python handles Qt object lifetimes/references differently than C++ and this (calling a constructor as a parameter for another function) can cause all sorts of nastiness if you're not careful. I know it's uglier to allocate a local variable for this, but you'll understand when you meet the first segfaults

The other note is python style - when dealing arrays it's recommended to use the 'in' operator. Faster, IMHO prettier and less error-prone than index based stuff. So, something like:

Code:

# c-ish
for r in range(8): 
            for c in range(16):
                self.ledArray[r][c].setChecked(self.ledState)

# pythonic
for row in self.ledArray: 
            for led in row:
                led.setChecked(self.ledState)

See ?

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