PyQt5学习笔记6 – QLabel

前文

PyQt5学习笔记1 – Windows下安装PyQt5
PyQt5学习笔记2 – Designer和Pyuic5
PyQt5学习笔记3 – 布局管理
PyQt5学习笔记4 – QMainWindow
PyQt5学习笔记5 – QWidget

本文概述

QLabel, 控件应用快捷键

QLabel

QLabel对象作为一个占位符可以显示不可编辑的文本或图片，也可以放置一个GIF动画，还可以被用作提示标记为其他控件。纯文本，链接或富文本可以显示在标签上。

QLabel是界面中的标签类，它继承自QFrame类，QLabel类的继承结构如下:

QObject ----+
            |
        QPaintDevice ---+
                        |
                    QWidget ----+
                                |
                            QFrame -----+
                                        |
                                    QLabel

QLabel类中常用方法如下:

QLabel常用信号如下:

实例：显示QLabel标签

from PyQt5.QtWidgets import QApplication, QLabel, QWidget, QVBoxLayout
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QPixmap, QPalette
import sys


class LabelDemo(QWidget):

    def __init__(self):
        super(LabelDemo, self).__init__()

        label1 = QLabel(self)
        label2 = QLabel(self)
        label3 = QLabel(self)
        label4 = QLabel(self)

        label1.setText("This is a Text Label.")
        label1.setAutoFillBackground(True)
        palette = QPalette()
        palette.setColor(QPalette.Window, Qt.blue)
        label1.setPalette(palette)
        label1.setAlignment(Qt.AlignCenter)

        label2.setText("<a href= # >Welcome to use PythonGUI program !!</a>")

        label3.setAlignment(Qt.AlignCenter)
        label3.setToolTip( This is a image label )
        label3.setPixmap(QPixmap( ../image/python.jpg ))

        label4.setText("<a href= https://www.baidu.com >百度一下，你就知道</a>")
        label4.setAlignment(Qt.AlignRight)
        label4.setToolTip("这是一个超链接标签。")

        vbox = QVBoxLayout()
        vbox.addWidget(label1)
        vbox.addStretch()
        vbox.addWidget(label2)
        vbox.addStretch()
        vbox.addWidget(label3)
        vbox.addStretch()
        vbox.addWidget(label4)

        label1.setOpenExternalLinks(False)
        label4.setOpenExternalLinks(True)   # 打开允许访问超链接，默认是False
        label4.linkActivated.connect(link_clicked)

        label2.linkHovered.connect(link_hovered)
        label1.setTextInteractionFlags(Qt.TextSelectableByMouse)

        self.setLayout(vbox)
        self.setWindowTitle( QLabelTitle )


def link_hovered():
    print( 鼠标滑过label2标签触发事件 )


def link_clicked():
    print( 鼠标点击label4标签触发事件 )


if __name__ ==  __main__ :
    app = QApplication(sys.argv)
    main = LabelDemo()
    main.show()
    sys.exit(app.exec_())

实例：QLabel标签快捷键的使用

from PyQt5.QtWidgets import *
import sys


class QLabelDemo(QDialog):
    def __init__(self):
        super(QLabelDemo, self).__init__()
        self.setWindowTitle( QLabel Demo )
        self.name_label = QLabel( &Name , self)
        self.name_edit = QLineEdit(self)
        self.name_label.setBuddy(self.name_edit)

        self.password_label = QLabel( &Password , self)
        self.password_edit = QLineEdit(self)

        self.password_label.setBuddy(self.password_edit)

        bt_ok = QPushButton( &OK )
        bt_cancel = QPushButton( &Cancel )
        main_layout = QGridLayout(self)
        main_layout.addWidget(self.name_label, 0, 0)
        main_layout.addWidget(self.name_edit, 0, 1, 1, 2)

        main_layout.addWidget(self.password_label, 1, 0)
        main_layout.addWidget(self.password_edit, 1, 1, 1, 2)

        main_layout.addWidget(bt_ok, 2, 1)
        main_layout.addWidget(bt_cancel, 2, 2)

        bt_ok.clicked.connect(self.ok_event)
        bt_cancel.clicked.connect(self.close_event)

    def ok_event(self):
        print(f Name: {self.name_edit.text()} )
        print(f Password: {self.password_edit.text()} )

    def close_event(self):
        self.close()


if __name__ ==  __main__ :
    app = QApplication(sys.argv)
    Demo = QLabelDemo()
    Demo.show()
    sys.exit(app.exec_())

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