JAVA Swing自定义JScorllPanel
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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 FlowLayout cornerLabel = 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); } }
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