9 pyqt5 qscrollarea scroll area and qscrollbar scroll bar

Class inheritance relationship is as follows ：

1 QScrollArea

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import os,sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
#from PyQt5.QtGui import *


class QScrollAreaDemo(QScrollArea):
    def __init__(self,*args,**kwargs):
        super(QScrollAreaDemo, self).__init__(*args,**kwargs)
        self.setWindowTitle("QScrollAreaDemo")
        self.resize(400,400)
        # as long as setwidget If the size of the scrolling area is larger than the window size, the scrollbar effect will appear 
        widget = QWidget()
        widget.setStyleSheet("background-color:red;")
        widget.setMinimumSize(600,600) # Scroll area 
        self.setWidget(widget)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainwindows = QScrollAreaDemo()
    mainwindows.show()
    sys.exit(app.exec())

The effect is as follows ：

2 QScrollBar

QScrollBar This control provides horizontal or vertical scrollbars , This can expand the effective loading area of the current window , To load more controls .

1 API

2 Signal slot

3 Demo

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import os,sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import  *


class QScrollBarDemo(QWidget):
    def __init__(self,*args,**kwargs):
        super(QScrollBarDemo, self).__init__(*args,**kwargs)
        self.setWindowTitle("QScrollBarDemo")
        self.resize(400,400)
        vlayout = QVBoxLayout(self)
        self.qscrollbar1 = QScrollBar()
        self.qscrollbar1.setOrientation(Qt.Horizontal) # level 
        self.qscrollbar2 = QScrollBar()
        self.qscrollbar2.setOrientation(Qt.Horizontal)  #  level 
        self.qscrollbar3 = QScrollBar(Qt.Horizontal)
        self.qscrollbar1.setRange(0,255)
        self.qscrollbar2.setRange(0, 255)
        self.qscrollbar3.setRange(0, 255)
        vlayout.addWidget(self.qscrollbar1)
        vlayout.addWidget(self.qscrollbar2)
        vlayout.addWidget(self.qscrollbar3)
        self.showlabel = QLabel(" Laugh all heroes ")
        font = QFont("Times", 50, QFont.Bold)
        self.showlabel.setFont(font)
        vlayout.addWidget(self.showlabel,8)
        #
        self.qscrollbar1.valueChanged.connect(self.slidermove)
        self.qscrollbar2.sliderMoved.connect(self.slidermove)
        self.qscrollbar3.sliderMoved.connect(self.slidermove)

    def slidermove(self,value):
        r = self.qscrollbar1.value()
        g = self.qscrollbar2.value()
        b = self.qscrollbar3.value()
        self.showlabel.setStyleSheet("color:rgb(%s,%s,%s)"%(r,g,b))

if __name__ == '__main__':
    app = QApplication(sys.argv)
    mainwindows = QScrollBarDemo()
    mainwindows.show()
    sys.exit(app.exec())

The effect is as follows ：

4 Style sheets

Scroll bar is divided horizontally vertical

QScrollBar:horizontal {
    
      border: 2px solid grey;
      background: #32CC99;
      height: 15px;
      margin: 0px 20px 0 20px;
  }
  QScrollBar::handle:horizontal {
    
      background: white;
      min-width: 20px;
  }
  QScrollBar::add-line:horizontal {
    
      border: 2px solid grey;
      background: #32CC99;
      width: 20px;
      subcontrol-position: right;
      subcontrol-origin: margin;
  }

  QScrollBar::sub-line:horizontal {
    
      border: 2px solid grey;
      background: #32CC99;
      width: 20px;
      subcontrol-position: left;
      subcontrol-origin: margin;
  }
 QScrollBar:left-arrow:horizontal, QScrollBar::right-arrow:horizontal {
    
      border: 2px solid grey;
      width: 3px;
      height: 3px;
      background: white;
  }

  QScrollBar::add-page:horizontal, QScrollBar::sub-page:horizontal {
    
      background: none;
  }

Vertical style ：

QScrollBar:vertical {
    background: url(images/scrollbar-vertical-bg.png);
    width: 9px;
    margin: 0px 0 0px 0;
}
QScrollBar::handle:vertical {
    background: rgb(195, 195, 195);
    min-height: 20px;
    margin: 0 1px 0 2px;
    border-radius: 3px;
    border: none;
    /*background: qlineargradient(spread:reflect, 
        x1:0, y1:0, x2:1, y2:0, 
        stop:0 rgba(164, 164, 164, 255), 
        stop:0.5 rgba(120, 120, 120, 255),
        stop:1 rgba(164, 164, 164, 255));*/
    /*border-image: url(images/scrollbar-vertical-thumb.png) 8px 0 8px 0 fixed;*/
}
 
QScrollBar::add-line:vertical {
    background: url(images/scrollbar-vertical-bg.png);
    height: 0px;
    subcontrol-position: bottom;
    subcontrol-origin: margin;
}
 
QScrollBar::sub-line:vertical {
    background: url(images/scrollbar-vertical-bg.png);
    height: 0px;
    subcontrol-position: top;
    subcontrol-origin: margin;
}
 
QScrollBar::up-arrow:vertical, QScrollBar::down-arrow:vertical {
    border: 1px solid grey;
    width: 3px;
    height: 3px;
    background: white;
}
 
QScrollBar::add-page:vertical, QScrollBar::sub-page:vertical {
    background: none;
}