如何将9补丁图像用作JPanel上的背景? [英] How use a 9-patch image as background on a JPanel?

问题描述

我正在寻找一种使用 9-patch 文件的方式javax.swing.JPanel的背景. 因此，当JPanel的尺寸更改时，背景图像会自动调整其大小.

I'm searching a way for use a 9-patch file as background for javax.swing.JPanel. So that the background image automatically resizes itself when the dimensions of the JPanel change.

有可能吗?还是我必须创建图像的所有部分，并在侦听器触发时手动调整其中一些的大小(如下面的代码所示)?

Is it possible? Or I have to create all the pieces of the image and manually resize some of them when the listener triggers (like in the piece of code that follows)?

public class JPanelWithNinePatchBackground extends JPanel { 
{ 
    /* Define all parts of the background like BufferedImage */

    addComponentListener(new ComponentAdapter() { 
        public void componentResized(ComponentEvent e) { 

            // Resize images . . . 

            JPanelWithBackground.this.repaint(); 
        } 
    });

    /* . . . */

}

推荐答案

是的，请使用 RCTile 是一个例子.

Yes, use either of the drawImage() implementations that let you specify the corners of the destination rectangle. The method will complete faster if the source and destination rectangles match in size. RCTile is an example.

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