python QLineEdit Text Color

问题

I am trying to create a demonstration app to show how to change font colors.

I can do it in QLabel and QTextEdit

I have found no way to change the foreground text color for a QLineEdit.

The only thing I've tried that does not throw an error is:

color = QColorDialog.getColor(defaultHost.textColor(), pWidget, 'Get Text Color')
myPalette.setColor(myPalette.WindowText, QColor(color))

But, the text color remains black...

Is it or is it not possible to do this?

回答1:

You can do it by setting the object's style sheet:

self.my_line_edit = QtGui.QLineEdit()

self.my_line_edit.setStyleSheet("color: red;")
# or
self.my_line_edit.setStyleSheet("color: rgb(255, 0, 0);")
# or
self.my_line_edit.setStyleSheet("""
    QLabel {
        color: red;
    }
    """)

回答2:

I solved for font text and background

 self.my_line_edit.setStyleSheet(
                """QLineEdit { background-color: green; color: white }""")

回答3:

Below is a code snippet that took me two days of trial and error to figure out. I hope it helps other newbies like myself. My comments in the code should help, too.

def set_palette(pWidget, pItem):
    # Get the pallet
    myPalette = pWidget.palette()
    defaultHost = led_dem.textEdit

    if isinstance(pWidget, QPushButton):
        # NOTE: Using stylesheets will temporarily change the color dialog popups push buttons
        print "Instance Is: %s " %(pWidget.objectName())
        # Existing colors.
        bgColor = pWidget.palette().color(QPalette.Background)
        fgColor = pWidget.palette().color(QPalette.Foreground)
        # Convert the QColors to a string hex for use in the Stylesheet.
        bg = bgColor.name()
        fg = fgColor.name()

        if pItem == 'Text':
            # Use the color dialog with a dummy widget to obtain a new QColor for the parameter we are changing.
            color = QColorDialog.getColor(defaultHost.textColor(), pWidget, 'Get Text Color')
            # Convert it to a string HEX
            fg = color.name()
            # Update all parameters of interest
            pWidget.setStyleSheet('background-color: ' + bg + ';color: ' + fg)

        if pItem == 'Background':
            color = QColorDialog.getColor(defaultHost.textColor(), pWidget, 'Get Background Color')
            myPalette.setColor(myPalette.Base, QColor(color))
            bg = color.name()
            pWidget.setStyleSheet('background-color: ' + bg + ';color: ' + fg)

This snippet shows:

how to find what type of widget you are dealing with;
how to covert a QColor from a QColorDialog into a string HEX format for use with a stylesheet; and
how to use the QColorDialog when the widget doesn't use a palette element of the type you need.

In my case I am using defaultHost = led_dem.textEdit where led_dem is my form and textEdit is a textEdit on the form.

Also, pWidget is the complete widget definition including form and instance.

回答4:

this is how I do it not using css

Palette= QtGui.QPalette()
Palette.setColor(QtGui.QPalette.Text, QtCore.Qt.red)
self.lineEdit.setPalette(Palette)

QLineEdit has a method initStyleOption and initStyleOption inherits QStyleOption, and then QStyleOption has a Method QPalette. Now you can take advatage of using QPalette methods.

you can visit this link for reference http://pyqt.sourceforge.net/Docs/PyQt4/qlineedit.html

来源：https://stackoverflow.com/questions/27432456/python-qlineedit-text-color

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