Как изменить текст qlabel

The QLabel widget provides a text or image display.

QLabel is used for displaying text or an image. No user interaction functionality is provided. The visual appearance of the label can be configured in various ways, and it can be used for specifying a focus mnemonic key for another widget.

A QLabel can contain any of the following content types:

Warning

When passing a QString to the constructor or calling setText(), make sure to sanitize your input, as QLabel tries to guess whether it displays the text as plain text or as rich text. You may want to call setTextFormat() explicitly, e.g. in case you expect the text to be in plain format but cannot control the text source (for instance when displaying data loaded from the Web).

When the content is changed using any of these functions, any previous content is cleared.

By default, labels display left-aligned, vertically-centered text and images, where any tabs in the text to be displayed are automatically expanded. However, the look of a QLabel can be adjusted and fine-tuned in several ways.

The positioning of the content within the QLabel widget area can be tuned with setAlignment() and setIndent(). Text content can also wrap lines along word boundaries with setWordWrap(). For example, this code sets up a sunken panel with a two-line text in the bottom right corner (both lines being flush with the right side of the label):

The properties and functions QLabel inherits from QFrame can also be used to specify the widget frame to be used for any given label.

A QLabel is often used as a label for an interactive widget. For this use QLabel provides a useful mechanism for adding an mnemonic (see QKeySequence) that will set the keyboard focus to the other widget (called the QLabel’s «buddy»). For example:

In this example, keyboard focus is transferred to the label’s buddy (the QLineEdit) when the user presses Alt+P. If the buddy was a button (inheriting from QAbstractButton), triggering the mnemonic would emulate a button click.

See also

QLineEdit, QTextEdit, QPixmap, QMovie, {fowler}{GUI Design Handbook: Label}

Definition at line 55 of file qlabel.h.

Destroys the label.

Definition at line 286 of file qlabel.cpp.

This event handler, for event event, can be reimplemented in a subclass to receive widget context menu events.

The handler is called when the widget’s contextMenuPolicy is Qt::DefaultContextMenu.

The default implementation ignores the context event. See the QContextMenuEvent documentation for more details.

See also

event(), QContextMenuEvent customContextMenuRequested()

Reimplemented from QWidget.

Reimplemented in QmlJSDebugger::ToolBarColorBox.

Definition at line 1010 of file qlabel.cpp.

the label’s text indent in pixels

If a label displays text, the indent applies to the left edge if alignment() is Qt::AlignLeft, to the right edge if alignment() is Qt::AlignRight, to the top edge if alignment() is Qt::AlignTop, and to to the bottom edge if alignment() is Qt::AlignBottom.

If indent is negative, or if no indent has been set, the label computes the effective indent as follows: If frameWidth() is 0, the effective indent becomes 0. If frameWidth() is greater than 0, the effective indent becomes half the width of the «x» character of the widget’s current font().

By default, the indent is -1, meaning that an effective indent is calculating in the manner described above.

See also

alignment, margin, frameWidth(), font()

Definition at line 65 of file qlabel.h.

the width of the margin

The margin is the distance between the innermost pixel of the frame and the outermost pixel of contents.

The default margin is 0.

See also

indent

Definition at line 64 of file qlabel.h.

whether the label will scale its contents to fill all available space.

When enabled and the label shows a pixmap, it will scale the pixmap to fill the available space.

This property’s default is false.

Definition at line 61 of file qlabel.h.

the selected text

If there is no selected text this property’s value is an empty string.

By default, this property contains an empty string.

See also

hasSelectedText()

Note: The textInteractionFlags set on the label need to include either TextSelectableByMouse or TextSelectableByKeyboard.

Since

4.7

Definition at line 69 of file qlabel.h.

the label’s text

If no text has been set this will return an empty string. Setting the text clears any previous content.

The text will be interpreted either as plain text or as rich text, depending on the text format setting; see setTextFormat(). The default setting is Qt::AutoText; i.e. QLabel will try to auto-detect the format of the text set.

If a buddy has been set, the buddy mnemonic key is updated from the new text.

Note that QLabel is well-suited to display small rich text documents, such as small documents that get their document specific settings (font, text color, link color) from the label’s palette and font properties. For large documents, use QTextEdit in read-only mode instead. QTextEdit can also provide a scroll bar when necessary.

Note

This function enables mouse tracking if text contains rich text.

See also

setTextFormat(), setBuddy(), alignment

Definition at line 58 of file qlabel.h.

Referenced by buddyString(), and QAccessibleDisplay::text().

the label’s word-wrapping policy

If this property is true then label text is wrapped where necessary at word-breaks; otherwise it is not wrapped at all.

By default, word wrap is disabled.

See also

text

Definition at line 63 of file qlabel.h.

import sys
from PyQt5 import QtWidgets, QtGui

def basicWindow():
    app = QtWidgets.QApplication(sys.argv)
    windowExample = QtWidgets.QWidget()
    labelA = QtWidgets.QLabel(windowExample)
    labelB = QtWidgets.QLabel(windowExample)
    labelA.setText('Label Example')
    labelB.setPixmap(QtGui.QPixmap('python.jpg'))
    windowExample.setWindowTitle('Label Example')
    windowExample.setGeometry(100, 100, 300, 200)
    labelA.move(100, 40)
    labelB.move(120, 120)
    windowExample.show()
    sys.exit(app.exec_())

basicWindow()

labelA = QtWidgets.QLabel(w)

labelA.setText('Label Example')

windowExample.setGeometry(100, 100, 300, 200)

labelA.move(100, 40)
labelB.move(120, 120)

labelB.setPixmap(QtGui.QPixmap('globe.png'))

import sys
from PyQt5 import QtWidgets, QtGui

def basicWindow():
    app = QtWidgets.QApplication(sys.argv)
    windowExample = QtWidgets.QWidget()
    labelA = QtWidgets.QLabel(windowExample)
    labelB = QtWidgets.QLabel(windowExample)
    labelA.setText('Times Font')
    labelA.setFont(QtGui.QFont("Times", 12, QtGui.QFont.Bold))
    labelB.setText('Arial Font')
    labelB.setFont(QtGui.QFont("Arial", 14, QtGui.QFont.Black))
    windowExample.setWindowTitle('Label Example')
    windowExample.setGeometry(100, 100, 300, 200)
    labelA.move(100, 40)
    labelB.move(100, 120)
    windowExample.show()
    sys.exit(app.exec_())

basicWindow()

labelA.setFont(QtGui.QFont("Times", 12, QtGui.QFont.Bold))

import sys
from PyQt5 import QtWidgets, QtGui, QtCore

def basicWindow():
    app = QtWidgets.QApplication(sys.argv)
    windowExample = QtWidgets.QWidget()

    labelLeft = QtWidgets.QLabel(windowExample)
    labelRight = QtWidgets.QLabel(windowExample)
    labelCenter = QtWidgets.QLabel(windowExample)

    labelLeft.setText('Left Align')
    labelRight.setText('Right Align')
    labelCenter.setText('Center Align')

    windowExample.setWindowTitle('Label Align Example')
    windowExample.setGeometry(100, 100, 300, 200)

    labelLeft.setFixedWidth(160)
    labelRight.setFixedWidth(160)
    labelCenter.setFixedWidth(160)

    labelLeft.setStyleSheet("border-radius: 25px;border: 1px solid black;")
    labelRight.setStyleSheet("border-radius: 25px;border: 1px solid black;")
    labelCenter.setStyleSheet("border-radius: 25px;border: 1px solid black;")

    labelLeft.setAlignment(QtCore.Qt.AlignLeft)
    labelRight.setAlignment(QtCore.Qt.AlignRight)
    labelCenter.setAlignment(QtCore.Qt.AlignCenter)
    
    labelLeft.move(80, 40)
    labelRight.move(80, 80)
    labelCenter.move(80, 120)    
    
    windowExample.show()
    sys.exit(app.exec_())

basicWindow()

labelLeft.setFixedWidth(160)
labelRight.setFixedWidth(160)
labelCenter.setFixedWidth(160)

labelLeft.setStyleSheet("border-radius: 25px;border: 1px solid black;")

labelLeft.setAlignment(QtCore.Qt.AlignLeft)
labelRight.setAlignment(QtCore.Qt.AlignRight)
labelCenter.setAlignment(QtCore.Qt.AlignCenter)