JAVA Swing自定义JScorllPanel

JAVA Swing中JScrollPanle自定义带标尺的JScrollPanel

Swing中JScrollPanel的结构与组成如下图：

分为四个角与四个边，中间蓝色矩形为View窗口，可以通过调用JScrollPanel的

getViewport().setView(view)完成对现实内容的设置。

最常见的自定义JScrollPanel是改写默认的Column  Header View与Row Header View

下面是我做的一个关于瓷砖排列显示的UI，实现了一个标尺化的JScrollPanel，可以很好

的度量与说明空间大小与瓷砖需求的关系，实现效果如下：

自定义的列与行标尺View的代码如下：

package com.gloomyfish.swing.custom.ui;import java.awt.Color;import java.awt.Dimension;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.geom.Line2D;import java.awt.geom.Rectangle2D;import javax.swing.JComponent;public class RuleView extends JComponent {    /** *  */private static final long serialVersionUID = 1L;public static final int HORIZONTAL = 0;    public static final int VERTICAL = 1;    private int SIZE = 600;    public int orientation;    public boolean isMetric;    private double increment;    private double units;    private int width;    private int height;        public RuleView(int o, boolean m) {        orientation = o;        isMetric = m;        setIncrementAndUnits();    if(orientation == HORIZONTAL)    {    width = SIZE;    }    else    {    height = SIZE;    }    }private void setIncrementAndUnits() {}    public void setPreferredHeight(int ph) {    this.height = ph;        setPreferredSize(new Dimension(SIZE, ph));    }    public void setPreferredWidth(int pw) {    this.width = pw;        setPreferredSize(new Dimension(pw, SIZE));    }    protected void paintComponent(Graphics g) {    Graphics2D g2d = (Graphics2D) g;    System.out.println("width = " + width);    System.out.println("Height = " + height);        // background color    g2d.setColor(new Color(102, 255, 255));    Rectangle2D rect2d = new Rectangle2D.Double(0, 0, width, height);    g2d.fill(rect2d);            int count = 0;    increment = 0;        // unit and text symbol    g2d.setPaint(new Color(0,0,204));    if(orientation == HORIZONTAL)    {    units = width / 10.0;    for(int i=0; i<=units; i++)    {    double rowOff = i * 10.0;    Line2D line = new Line2D.Double(rowOff, height*0.7, rowOff, height);    g2d.draw(line);    if(count == 10)    {    count = 0;    increment += 1;    Line2D bigLine = new Line2D.Double(rowOff, height*0.4, rowOff, height);        g2d.draw(bigLine);        g2d.drawString(increment + "", (int)rowOff-3, (int)(height/3.0));    }    count++;    }    }    else    {    units = height / 10.0;    for(int i=0; i<=units; i++)    {    double colOff = i * 10.0;    Line2D line = new Line2D.Double(width*0.7, colOff, width, colOff);    g2d.draw(line);    if(count == 10)    {    count = 0;    increment += 1;    Line2D bigLine = new Line2D.Double(width*0.5, colOff, width, colOff);        g2d.draw(bigLine);        g2d.drawString(increment + "", 0, (int)colOff);    }    count++;    }    }    g2d.setPaint(Color.RED);        }}

自定义的JScrollPanel的代码如下：

package com.gloomyfish.swing.custom.ui;import java.awt.Color;import java.awt.FlowLayout;import java.awt.Font;import javax.swing.JComponent;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.border.LineBorder;public class JCustomScrollPane extends JScrollPane {/** *  */private static final long serialVersionUID = 1L;private RuleView columnView;private RuleView rowView;private JLabel cornerLabel;public JCustomScrollPane(int rowSize, int columnSize){super();JPanel buttonCorner = new JPanel(); // use FlowLayoutcornerLabel = new JLabel("单位:米");cornerLabel.setForeground(Color.BLUE);cornerLabel.setFont(new Font("Serif", Font.PLAIN, 8));buttonCorner.setLayout(new FlowLayout(FlowLayout.LEFT));buttonCorner.add(cornerLabel);setCorner(JScrollPane.UPPER_LEFT_CORNER, buttonCorner);columnView = new RuleView(RuleView.HORIZONTAL, true);columnView.setPreferredHeight(30);rowView = new RuleView(RuleView.VERTICAL, true);rowView.setPreferredWidth(30);setColumnHeaderView(columnView);setRowHeaderView(rowView);setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);    setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);    setViewportBorder(new LineBorder(Color.RED));}public void setImagePanel(JComponent view){this.getViewport().setView(view);}}

最后说一下，Swing 是非常灵活的UI组件，提供了非常多的自定义接口

怎么合理运用就看个人啦！