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How to use QPushButton in Python? in view of this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible way.

I. case objectives

Create an interface such as the picture on the right. The function is to describe the three primary colors. In design, we often have the concept of three primary colors.

Basically all colors can be reconciled with three colors, which are red, green and blue.

We use three buttons to express the three colors in a table. Each button can have two states: the selected button is blue and the unselected button is the default gray. A QFrame is used to represent the state of the color in the interface.

II. Development ideas

1. PYqt5 is used to lay out the interface.

two。 The method of box layout is used for interface layout.

3. The status function of the button is added.

4. Sets the background color of the Qframe.

5. Set the click event of the button

6. In the case of setting the three primary colors, the color change will eventually be realized by changing the Qframe style.

III. Development process

1. Use the frame container QFrame

Must use the class library QFrame

Initialize:

Myframe=QFrame ()

Note:

The parent container can be set later by adding it to the box layout.

Of course, it can be set at initialization time.

The settings of the parent container affect the lifecycle of the child container.

two。 Control to set the CSS style

It can be set through the setStyleSheet method.

This method can be implemented on almost all Qwidget controls.

Examples of use:

Myframe.setStyleSheet ("QWidget {background-color:black}")

Use a string of type css in the setStyleSheet method.

This css style uses the format:

Need to control the control label or behavior, and then write a curly braces {}, we write in the curly braces to control the style of a label. The writing style of the style is the attribute: value

3. Button toggle

Sets whether the button can switch between selected and unchecked states

Use the setCheckable method. By default, this method sets the value to false. We must set it to True to turn on the selected switch function of this button.

For example:

BtnRed.setCheckable (True)

4. Slot function parameter transfer

The definition of slot function depends on whether our signal source has parameters.

We need to use parentheses for the signal parameters in the part of the signal source that has parameters.

Examples of use:

BtngGreen.clicked [bool] .connect (self.setColor)

Question: how to pass control objects?

At the same time, the sender function is implemented.

B=self.sender ()

5. Trichromatic function

Use Qcolor to implement.

The scores of red, green and blue are all in [0255].

The first parameter indicates red

The second parameter indicates green

The third parameter indicates blue

This is the answer to the question about how to use QPushButton in Python. I hope the above content can be of some help to you. If you still have a lot of doubts to solve, you can follow the industry information channel for more related knowledge.

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