How to use QSlider in Python
This article introduces how to use QSlider in Python, the content is very detailed, interested friends can refer to, hope to be helpful to you.
1. Qslider control
1. Control introduction and use
Qslider is interpreted as a slider control, which is used to facilitate sliding left and right.
Often this type of sliding is used more for devices that can be touched by the screen.
When we want to use the slider control, we essentially call the Qslider class.
When you use it, you first instantiate the class qslider and then call it.
two。 Orientation of the control
This control can place the Qt.Horizontal horizontally or vertically.
3. The use format of the control
Variable name = Qslider (orientation, parent container)
The horizontal direction value is 1 and the vertical direction value is 2
Application examples:
Sl=QSlider (Qt.Horizontal,self)
3. Configuration of the control
The maximum value setting of the slider control (range setting)
Set the minimum value and call the setMinimum method directly
For example, set the minimum value to 0
Sl.setMinimum (0)
Maximum value setting, call the setMaximum method directly
For example, set the maximum value to 255.
Sl.setMaximum (255)
Sliding value change event of slider
Use format:
Slider object name. ValueChanged [int] .connect (corresponding to slot function)
SL.valueChanged [int] .connect (self.myValue)
II. Review of enumeration
Enumerated classes exist in the QtCore core class library.
An example of the import of this class:
From PyQt5.QtCore import Qt
III. Summary and emphasis
1. Master the use of slider control Qslider
two。 The event of mastering the slider value
3. Master the use of enumerated class libraries
The source code of this section tutorial:
Import sysfrom PyQt5.QtWidgets import QApplication,QWidget,QSliderfrom PyQt5.QtGui import QColorfrom PyQt5.QtCore import Qt
Class MyClass (QWidget): def _ init__ (self): super (MyClass, self). _ _ init__ () self.initUI () def initUI (self): self.setWindowTitle ("Liu Jinyu programming") self.setGeometry (300100400300) sl=QSlider (2 Self) sl.move (50 background-color:black 50) sl.setMinimum (0) sl.setMaximum (255) sl.valueChanged [int] .connect (self.myValue) self.setStyleSheet ("QWidget {background-color:black}") self.show () def myValue (self,a): mycolor=QColor (0Pol 0) 0) mycolor.setBlue (a) self.setStyleSheet ("QWidget {background-color:%s}"% mycolor.name ())
If _ name__== "_ _ main__": app=QApplication (sys.argv) mc=MyClass () app.exec_ ()
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