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QStyleSheet property for QPushButton with empty text

I am trying to do something like this:

QPushButton[text=""] {
    background-color: rgb(255, 0, 0);
}

QPushButton {
    background-color: rgb(0, 0, 0);
}

Basically, some of my QPushButtons have text and some don't, and I want to style the ones that differ from the ones that don't.

This works if I include the actual string value, i.e.

QPushButton[text="Ok"] {
    background-color: rgb(255, 0, 0);
}

Then any buttons that say "OK" have a red background. But what should I pass for a button without text?

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2 answers


This stylesheet works for me (Linux, Qt 5.3):



QPushButton[text] {
    background-color: "green";
}

QPushButton[text="some text"] {
    background-color: "red";
}

QPushButton {
    background-color: "blue";
}
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LAST EDITED : 9/8/2014 1:05

Ok, I'm sorry that I didn't understand this question. I have the same problem with you to set empty text. But it works in Qt Designer. (Why? I don't know.) And I cannot find any other property.

I have a solution, I create my property isEmpty

'in QPushButton

by inheriting from them. And add a property Like this:

import sys
from PyQt4 import QtCore, QtGui

class customQPushButton (QtGui.QPushButton):
    def setPropertyIsStringEmpty (self, text):
        self.setProperty('isEmpty', QtCore.QVariant(False if len(text) > 0 else True))

    def setText (self, text):
        self.setPropertyIsStringEmpty(text)
        QtGui.QPushButton.setText(self, text)

class exampleQMainWindow (QtGui.QMainWindow):
    def __init__ (self):
        super(exampleQMainWindow, self).__init__()
        self.testQPushButton = customQPushButton(self)
        self.testQPushButton.setText('')
        self.setStyleSheet ('''
            QPushButton {
                color: rgb(255, 255, 255);
            }
            QPushButton[text="Ok"] {
                background-color: rgb(255, 0, 0);
            }
            QPushButton[isEmpty=true] {
                background-color: rgb(0, 0, 255);
            }
        ''')
        self.setCentralWidget(self.testQPushButton)
        self.testQPushButton.keyPressEvent = self.keyPressEvent

app = QtGui.QApplication([])
window = exampleQMainWindow()
window.show()
sys.exit(app.exec_())

In order to create a new object. But, if you are creating Qt Designer, I have to update Property on call setPropertyIsStringEmpty (self, text)

.



Hello,

MESSAGE from 9/8/2014 1:05 AM : This is my old post. if they are useless, please avoid them.

Perhaps if you create your own template style sheet

and put it style sheet

in your code or instruction you want to install.

I have an example, this example shows that I am handling an arrow (just not down) pressing a key and setting a new button color;

import sys
from PyQt4 import QtCore, QtGui

ENUM_COLOR_RED   = 0
ENUM_COLOR_GREEN = 1
ENUM_COLOR_BLUE  = 2

def getStyleSheetQPushButtonRed ():
    return '''
        QPushButton {
            color: rgb(255, 255, 255);
            background-color: rgb(255, 0, 0);
        }
    '''
def getStyleSheetQPushButtonGreen ():
    return '''
        QPushButton {
            color: rgb(255, 255, 255);
            background-color: rgb(0, 255, 0);
        }
    '''

def getStyleSheetQPushButtonBlue ():
    return '''
        QPushButton {
            color: rgb(255, 255, 255);
            background-color: rgb(0, 0, 255);
        }
    '''

class exampleQMainWindow (QtGui.QMainWindow):
    def __init__ (self):
        super(exampleQMainWindow, self).__init__()
        self.testQPushButton = QtGui.QPushButton('KM', self)
        self.setCentralWidget(self.testQPushButton)
        self.testQPushButton.keyPressEvent = self.keyPressEvent

    def setText (self, text, color):
        styleSheet = {
            ENUM_COLOR_RED   : getStyleSheetQPushButtonRed,
            ENUM_COLOR_GREEN : getStyleSheetQPushButtonGreen,
            ENUM_COLOR_BLUE  : getStyleSheetQPushButtonBlue
        } [color]()
        self.testQPushButton.setText(text)
        self.testQPushButton.setStyleSheet(styleSheet)

    def keyPressEvent (self, eventQKeyEvent):
        key = eventQKeyEvent.key()
        if key == QtCore.Qt.Key_Left:
            self.setText('LEFT', ENUM_COLOR_RED)
        elif key == QtCore.Qt.Key_Up:
            self.setText('UP', ENUM_COLOR_GREEN)
        elif key == QtCore.Qt.Key_Right:
            self.setText('RIGHT', ENUM_COLOR_BLUE)

app = QtGui.QApplication([])
window = exampleQMainWindow()
window.show()
sys.exit(app.exec_())

Advantages : You can put colored text in the button.

Cons : the color is style sheet

set anytime it has an event by statement.

This is useful for implementing the Style Sheet, I hope it helps;

Link : http://qt-project.org/doc/qt-4.8/stylesheet-syntax.html

Hello,

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