from PyQt5.QtWidgets import QApplication, QWidget, QTextEdit
from PyQt5.QtCore import Qt
import sys

class ScrollAreaDemo(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('QTextEdit Scroll Area Demo')
        self.setGeometry(100, 100, 400, 300)

        #由于QAbstractScrollArea是抽象類，需要通過(guò)其子類實(shí)例化，我們采用其子類QTextEdit來(lái)實(shí)例化對(duì)象
        # 創(chuàng)建QTextEdit作為滾動(dòng)區(qū)域
        self.textEdit = QTextEdit(self)
        self.textEdit.setPlainText("這里是一段很長(zhǎng)的文本，用于演示滾動(dòng)條的效果。當(dāng)文本內(nèi)容超出可視區(qū)域時(shí)，滾動(dòng)條會(huì)自動(dòng)出現(xiàn)。")

        # 設(shè)置滾動(dòng)條始終顯示
        self.textEdit.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
        self.textEdit.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOn)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    demo = ScrollAreaDemo()
    demo.show()
    sys.exit(app.exec_())

# 設(shè)置滾動(dòng)條始終顯示
self.textEdit.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
self.textEdit.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOn)

# 或者設(shè)置滾動(dòng)條從不顯示
# self.textEdit.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
# self.textEdit.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)

from PyQt5.QtWidgets import QPushButton

# 創(chuàng)建一個(gè)按鈕作為角落控件
cornerButton = QPushButton('角落控件', self)
cornerButton.clicked.connect(lambda: print('點(diǎn)擊了角落控件'))

# 設(shè)置角落控件
self.textEdit.setCornerWidget(cornerButton)

# 0. 導(dǎo)入需要的包和模塊
from PyQt5.Qt import *
import sys


# 1. 創(chuàng)建一個(gè)應(yīng)用程序?qū)ο?
app = QApplication(sys.argv)

# 2. 控件的操作
# 2.1 創(chuàng)建控件
window = QWidget()
# 2.2 設(shè)置控件
window.setWindowTitle("QAbstractScrollArea")
window.resize(500, 500)

#由于QAbstractScrollArea是抽象類，需要通過(guò)其子類實(shí)例化，我們采用其子類QTextEdit來(lái)實(shí)例化對(duì)象
te = QTextEdit("社會(huì)我景天哥", window)

#設(shè)置滾動(dòng)策略
#設(shè)置垂直滾動(dòng)條一直打開
# te.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
#設(shè)置水平滾動(dòng)條一直打開
# te.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOn)


#角落控件

btn = QPushButton(window)
btn.setIcon(QIcon("../imgs/python-gui.png"))
btn.pressed.connect(lambda :print("按鈕被點(diǎn)擊"))

#將按鈕設(shè)置為角落控件
te.setCornerWidget(btn)



# 2.3 展示控件
window.show()
# 3. 應(yīng)用程序的執(zhí)行, 進(jìn)入到消息循環(huán)
sys.exit(app.exec_())