油漆，重漆，油漆组件 [英] Paint, repaint , paintComponent

问题描述

对不起，我经常搜索这三个函数（paint，repaint，paintComponent）如何在它们之间进行交互，但我不知道。你可以在他们被叫的时候准确地解释我（因为有时候java会在没有我问他的情况下调用它）他们究竟做了什么，他们之间有什么区别。谢谢

excuse me i search a lot to find how those 3 functions (paint, repaint, paintComponent) interact between them but i have no idea. Can you explain me exactly when they are called ( because sometimes java call it without me asking him) what they do exactly and what is the difference between them. Thank you

推荐答案

我不确定画，但我可以解释一下repaint（）和paintComponent（）之间的关系。

I am not sure about "paint", but I can explain the relationship between repaint() and paintComponent().

在我对java的有限经验中，paintComponent（）方法是JPanel类中的一个方法，是swing的成员。

In my limited experience with java, the paintComponent() method is a method in the JPanel class and is a member of "swing".

paintComponent（）方法处理所有绘画。从本质上讲，它使用Graphic对象将您想要的任何内容绘制到JPanel中。

The paintComponent() method handles all of the "painting". Essentially, it draws whatever you want into the JPanel usings a Graphic object.

repaint（）是所有JPanel对象的继承实例方法。调用[your_JPanel_object] .repaint（）会调用paintComponent（）方法。

repaint() is an inherited instance method for all JPanel objects. Calling [your_JPanel_object].repaint() calls the paintComponent() method.

每次要更改JPanel的外观时，都必须调用repaint（）。

Every time you wish to change the appearance of your JPanel, you must call repaint().

某些操作自动调用repaint（）方法：

Certain actions automatically call the repaint() method:

• 重新调整大小您的窗口


• 最小化并最大化您的窗口

仅举几例。

IN SHORT paintComponent（）是在JPanel中定义的方法或您自己的扩展JPanel的自定义类。 repaint（）是在另一个类（例如JFrame）中调用的方法，它最终调用paintComponent（）。

IN SHORT paintComponent() is a method defined in JPanel or your own custom class that extends JPanel. repaint() is a method called in another class (such as JFrame) that eventually calls paintComponent().

这里有一个例子：

    public class MyPanel extends JPanel{

    public void paintComponent(Graphics g){
        super.paintComponent(g);

        g.draw([whatever you want]);

        ...
        ...

    }
}
public class MyFrame extends JFrame{

    public MyFrame(){

    MyPanel myPanel = new MyPanel();

    myPanel.repaint();

    }

}

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