为JTextPane边框创建自定义形状

Question

​

​

​

​

我正在设计一个聊天应用程序。

对于作为JTextPane的聊天框，我使用了一个自定义形状，而不是第一张图片中显示的默认矩形形状。但是，当此JInternalFrame窗口悬停在另一个窗口(JInternalFrame)上时，自定义JTextPane的边框线将显示拖动线，如第二幅图所示。

请问为什么会发生这种情况？

我所做的就是将JTextpane的边框设置到AbstractBorder的一个子类中，也附加了AbstractBorder的子类。但是我注意到，当我删除paintBorder()方法的if(parent != null)块下的graphic.setclip(area)和graphic.setclip(null)时，这个问题就消失了。

我如何解决这行问题，并仍然有我的花哨的文本框？

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Polygon;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.geom.Area;
import java.awt.geom.RoundRectangle2D;
import javax.swing.JPanel;
import javax.swing.border.AbstractBorder;

public class TextBubbleBorder1 extends AbstractBorder {

    private Color color;
    private int thickness = 4;
    private int radii = 8;
    private int pointerSize = 7;
    private Insets insets = null;
    private BasicStroke stroke = null;
    private int strokePad;
    private int pointerPad = 4;
    private boolean left = true;
    int xi, yi;
    RenderingHints hints;
    JPanel pane;
    boolean right;

    TextBubbleBorder1(
            Color color, int thickness, int radii, int pointerSize) {
        this.thickness = thickness;
        this.radii = radii;
        this.pointerSize = pointerSize;
        this.color = color;

        stroke = new BasicStroke(thickness);
        strokePad = thickness / 2;

        hints = new RenderingHints(
                RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);

        int pad = radii + strokePad;
        int bottomPad = pad + pointerSize + strokePad;
        insets = new Insets(-2,16,0,0);
    }


    TextBubbleBorder1(
    Color color,int thickness,int radii,int pointerSize,bolean left, boolean right, int x, int y) {
        this(color, thickness, radii, pointerSize);
        this.left = left;
        this.xi = x;
        this.yi = y;
        this.right = right;

    }

    @Override
    public Insets getBorderInsets(Component c) {
        return insets;
    }

    @Override
    public Insets getBorderInsets(Component c, Insets insets) {
        return getBorderInsets(c);
    }

    @Override
    public void paintBorder(
            Component c,
            Graphics g,
            int x, int y,
            int width, int height) {

        Graphics2D g2 = (Graphics2D) g;

        int bottomLineY = height - thickness - pointerSize + 10 ;

        RoundRectangle2D.Double bubble = null;
        Area area = null;

        Polygon pointer = null;
        if(!right){

         bubble = new RoundRectangle2D.Double(
                10,
                0,               
                !left ? width-9 : width - 25,
                bottomLineY,
                radii,
                radii);
        area = new Area(bubble);
         pointer = new Polygon();
        if(!left){
            // left point
        pointer.addPoint(11, 3);
        pointer.addPoint(11, 14);
        pointer.addPoint(0, 8);
        }else{
        pointer.addPoint(width-17, 2);
        pointer.addPoint(width-23, 16);
        pointer.addPoint(width-5, 6);
        } 
        area.add(new Area(pointer));
        }else{
            bubble = new RoundRectangle2D.Double(
                0,
                -2,               
                width,
                bottomLineY+5,
                radii,
                radii);
        area = new Area(bubble);
        }



        g2.setRenderingHints(hints);

        // Paint the BG color of the parent, everywhere outside the clip
        // of the text bubble.
        Component parent  = c.getParent();
     if (parent!=null) {
           Color bg = parent.getBackground();
              Rectangle rect = new Rectangle(0,0,width, height);
              Area borderRegion = new Area(rect);
              borderRegion.subtract(area);
            g2.setClip(borderRegion);
            g2.setColor(bg);
            g2.fillRect(0, 0, width, height);
            g2.setClip(null);
       }
        g2.setColor(color);
        g2.setStroke(stroke);
        g2.draw(area);
    }

}

Answer 1

您可以存储原始剪辑并将其设置回去

例如。

Shape oldCLip=g2.getClip();
...your code here...
g2.setClip(oldClip);

剪辑不是矩形，但可以是自定义形状。当您将其设置为null时，您也会为父实例销毁它，因为Graphics实例从父实例到子实例。因此，您应该正确地恢复它。