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36.Python实战__滚动区域控件简介2

  • 2026-06-26 02:19:38
36.Python实战__滚动区域控件简介2
    上节聊了聊滚动区域控件QScrollArea()用来创建一个可滚动的区域,在滚动区域添加一个大的控件,用拖动滚动条来预览全部内容,效果如下:
    我们以前创建类时都是继承自QWidget()这个控件,因为他是所有可视化控件的基类,一般也都是继承自QWidget();
    但是如果你的窗口中所有的内容全都在滚动区域QScrollArea()内时,其实可以直接继承自QScrollArea()这个类了,这样你的主窗口就相当于一个滚动区域,你只需要把你的所有控件通过 setWidget(控件)添加到主窗口中就行了;
需要注意的是,如果你的窗口中既有一般的控件,又有滚动区域控件,这就还需要继承自QWidget(),在QWidget()空白窗口上放置一般的非滚动显示控件 和 滚动显示控件
    比如上节只是显示一个图片的滚动区域窗口,完全可以继承自QScrollArea()控件。
附代码如下:
一、先导入用到的模块
from PySide6.QtGui import QPixmap  # QPixmap是用来加载图片的一个类,他不是一个控件from PySide6.QtWidgets import QApplication,      QLabel, QScrollArea
二、创建一个类,并继承自QWidget
class Win(QScrollArea):    def __init__(self):            # 初始化父类QScrollArea         super().__init__()                 # 设置窗口的标题                 self.setWindowTitle("图片预览")        
三、在实例方法setup_ui( )中创建控件
def setup_01(self):    # 创建一个标签来显示图片        label = QLabel()        # 加载一个图片对象        pixmap = QPixmap("./1.jpg")        label.setPixmap(pixmap)        # 把标签添加到滚动区域        # 这时候滚动区域就是self了    self.setWidget(label) 
四、最后是运行主程序,固定的写法
if __name__ == "__main__":        import sys        # 创建一个app实例    app = QApplication(sys.argv)        # 实例化上面的类 Win()    win = Win()    # 显示上面实例化后的窗口对象        win.show()    # 运行程序        sys.exit(app.exec())
上面程序运行效果如下:
    效果与上面继承QWidget()的效果唯一的区别是,图片周边没有了白色的边距,QWidget()默认四周是有一定白边的;QScrollArea( )直接贴着窗口显示,没有白边距了。这个边距可以通过设置QLabel()来设置的。
    通过上面的例子,我们发现,创建类时,继承自那个父类,是可以根据需要来选择的,下节咱们就用直接继承QScrollArea()来做个案例。
    大家有空了一定要亲手敲一敲代码来加深自己的理解。

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  1. CONNECT:[ UseTime:0.000721s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001045s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001424s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000587s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001259s ]
  6. SELECT * FROM `set` [ RunTime:0.000430s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001074s ]
  8. SELECT * FROM `article` WHERE `id` = 501067 LIMIT 1 [ RunTime:0.001267s ]
  9. UPDATE `article` SET `lasttime` = 1783006067 WHERE `id` = 501067 [ RunTime:0.040539s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003375s ]
  11. SELECT * FROM `article` WHERE `id` < 501067 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000913s ]
  12. SELECT * FROM `article` WHERE `id` > 501067 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000888s ]
  13. SELECT * FROM `article` WHERE `id` < 501067 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006602s ]
  14. SELECT * FROM `article` WHERE `id` < 501067 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016417s ]
  15. SELECT * FROM `article` WHERE `id` < 501067 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014663s ]
0.226358s