JTable如何更改BackGround颜色
我启发了MeBigFatGuy有趣的问题 ，在这个连接我有非常具体的问题关于Graphisc2D ，如何改变BackGround Color依赖如果JViewPort可见，
1）如果1st. & last JTables Row 1st. & last JTables Row的JViewPort在JViewPort可见，然后BackGround将被着色为Color.red
2）如果1st. & last JTables Row 1st. & last JTables Row JViewPort BackGround不会在JViewPort可见，那么BackGround将被着色为Color.whatever
来自SSCCE
import java.awt.*; import java.awt.event.ActionEvent; import java.awt.image.BufferedImage; import javax.swing.*; import javax.swing.RepaintManager; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; import javax.swing.table.TableModel; /* https://stackoverflow.com/questions/1249278/ how-to-disable-the-default-painting-behaviour-of-wheel-scroll-event-on-jscrollpan * and * https://stackoverflow.com/questions/8195959/ swing-jtable-event-when-row-is-visible-or-when-scrolled-to-the-bottom */ public class ViewPortFlickering { private JFrame frame = new JFrame("Table"); private JViewport viewport = new JViewport(); private Rectangle RECT = new Rectangle(); private Rectangle RECT1 = new Rectangle(); private JTable table = new JTable(50, 3); private javax.swing.Timer timer; private int count = 0; public ViewPortFlickering() { GradientViewPort tableViewPort = new GradientViewPort(table); viewport = tableViewPort.getViewport(); viewport.addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) { RECT = table.getCellRect(0, 0, true); RECT1 = table.getCellRect(table.getRowCount() - 1, 0, true); Rectangle viewRect = viewport.getViewRect(); if (viewRect.intersects(RECT)) { System.out.println("Visible RECT -> " + RECT); } else if (viewRect.intersects(RECT1)) { System.out.println("Visible RECT1 -> " + RECT1); } else { // } } }); frame.add(tableViewPort); frame.setPreferredSize(new Dimension(600, 300)); frame.pack(); frame.setLocation(50, 100); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); RepaintManager.setCurrentManager(new RepaintManager() { @Override public void addDirtyRegion(JComponent c, int x, int y, int w, int h) { Container con = c.getParent(); while (con instanceof JComponent) { if (!con.isVisible()) { return; } if (con instanceof GradientViewPort) { c = (JComponent) con; x = 0; y = 0; w = con.getWidth(); h = con.getHeight(); } con = con.getParent(); } super.addDirtyRegion(c, x, y, w, h); } }); frame.setVisible(true); start(); } private void start() { timer = new javax.swing.Timer(100, updateCol()); timer.start(); } public Action updateCol() { return new AbstractAction("text load action") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(ActionEvent e) { System.out.println("updating row " + (count + 1)); TableModel model = table.getModel(); int cols = model.getColumnCount(); int row = 0; for (int j = 0; j < cols; j++) { row = count; table.changeSelection(row, 0, false, false); timer.setDelay(100); Object value = "row " + (count + 1) + " item " + (j + 1); model.setValueAt(value, count, j); } count++; if (count >= table.getRowCount()) { timer.stop(); table.changeSelection(0, 0, false, false); java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { table.clearSelection(); } }); } } }; } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { ViewPortFlickering viewPortFlickering = new ViewPortFlickering(); } }); } } class GradientViewPort extends JScrollPane { private static final long serialVersionUID = 1L; private final int h = 50; private BufferedImage img = null; private BufferedImage shadow = new BufferedImage(1, h, BufferedImage.TYPE_INT_ARGB); private JViewport viewPort; public GradientViewPort(JComponent com) { super(com); viewPort = this.getViewport(); viewPort.setScrollMode(JViewport.BLIT_SCROLL_MODE); viewPort.setScrollMode(JViewport.BACKINGSTORE_SCROLL_MODE); viewPort.setScrollMode(JViewport.SIMPLE_SCROLL_MODE); Graphics2D g2 = shadow.createGraphics(); g2.setPaint(new Color(250, 150, 150)); g2.fillRect(0, 0, 1, h); g2.setComposite(AlphaComposite.DstIn); g2.setPaint(new GradientPaint(0, 0, new Color(0, 0, 0, 0f), 0, h, new Color(0.5f, 0.8f, 0.8f, 0.5f))); g2.fillRect(0, 0, 1, h); g2.dispose(); } @Override public void paint(Graphics g) { if (img == null || img.getWidth() != getWidth() || img.getHeight() != getHeight()) { img = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB); } Graphics2D g2 = img.createGraphics(); super.paint(g2); Rectangle bounds = getViewport().getVisibleRect(); g2.scale(bounds.getWidth(), -1); int y = (getColumnHeader() == null) ? 0 : getColumnHeader().getHeight(); g2.drawImage(shadow, bounds.x, -bounds.y - y - h, null); g2.scale(1, -1); g2.drawImage(shadow, bounds.x, bounds.y + bounds.height - h + y, null); g2.dispose(); g.drawImage(img, 0, 0, null); } }
因为我search不同的build议，我用我原来对Graphics的认识来解决这个问题
基于代码
import java.awt.*; import java.awt.event.ActionEvent; import java.awt.image.BufferedImage; //import java.awt.image.ColorModel; // I don't know how to use that //import java.awt.image.SampleModel;// I don't know how to use that import javax.swing.*; import javax.swing.RepaintManager; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; import javax.swing.table.TableModel; public class ViewPortFlickeringOriginal { private JFrame frame = new JFrame("Table"); private JViewport viewport = new JViewport(); private Rectangle RECT = new Rectangle(); private Rectangle RECT1 = new Rectangle(); private JTable table = new JTable(50, 3); private javax.swing.Timer timer; private int count = 0; private boolean topOrBottom = false; private GradientViewPortOriginal tableViewPort; public ViewPortFlickeringOriginal() { tableViewPort = new GradientViewPortOriginal(table); viewport = tableViewPort.getViewport(); viewport.addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) { if (tableViewPort.bolStart) { RECT = table.getCellRect(0, 0, true); RECT1 = table.getCellRect(table.getRowCount() - 1, 0, true); Rectangle viewRect = viewport.getViewRect(); if (viewRect.intersects(RECT)) { System.out.println("Visible RECT -> " + RECT); tableViewPort.paintBackGround(new Color(250, 150, 150)); } else if (viewRect.intersects(RECT1)) { System.out.println("Visible RECT1 -> " + RECT1); tableViewPort.paintBackGround(new Color(150, 250, 150)); } else { System.out.println("Visible RECT1 -> ???? "); tableViewPort.paintBackGround(new Color(150, 150, 250)); } } } }); frame.add(tableViewPort); frame.setPreferredSize(new Dimension(600, 300)); frame.pack(); frame.setLocation(50, 100); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); RepaintManager.setCurrentManager(new RepaintManager() { @Override public void addDirtyRegion(JComponent c, int x, int y, int w, int h) { Container con = c.getParent(); while (con instanceof JComponent) { if (!con.isVisible()) { return; } if (con instanceof GradientViewPortOriginal) { c = (JComponent) con; x = 0; y = 0; w = con.getWidth(); h = con.getHeight(); } con = con.getParent(); } super.addDirtyRegion(c, x, y, w, h); } }); frame.setVisible(true); start(); } private void start() { timer = new javax.swing.Timer(100, updateCol()); timer.start(); } public Action updateCol() { return new AbstractAction("text load action") { private static final long serialVersionUID = 1L; @Override public void actionPerformed(ActionEvent e) { System.out.println("updating row " + (count + 1)); TableModel model = table.getModel(); int cols = model.getColumnCount(); int row = 0; for (int j = 0; j < cols; j++) { row = count; table.changeSelection(row, 0, false, false); timer.setDelay(100); Object value = "row " + (count + 1) + " item " + (j + 1); model.setValueAt(value, count, j); } count++; if (count >= table.getRowCount()) { timer.stop(); table.changeSelection(0, 0, false, false); java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { table.clearSelection(); tableViewPort.bolStart = true; } }); } } }; } public static void main(String[] args) { java.awt.EventQueue.invokeLater(new Runnable() { @Override public void run() { ViewPortFlickeringOriginal viewPortFlickering = new ViewPortFlickeringOriginal(); } }); } } class GradientViewPortOriginal extends JScrollPane { private static final long serialVersionUID = 1L; private final int h = 50; private BufferedImage img = null; private BufferedImage shadow = new BufferedImage(1, h, BufferedImage.TYPE_INT_ARGB); private JViewport viewPort; public boolean bolStart = false; public GradientViewPortOriginal(JComponent com) { super(com); viewPort = this.getViewport(); viewPort.setScrollMode(JViewport.BLIT_SCROLL_MODE); viewPort.setScrollMode(JViewport.BACKINGSTORE_SCROLL_MODE); viewPort.setScrollMode(JViewport.SIMPLE_SCROLL_MODE); paintBackGround(new Color(250, 150, 150)); } public void paintBackGround(Color g) { Graphics2D g2 = shadow.createGraphics(); g2.setPaint(g); g2.fillRect(0, 0, 1, h); g2.setComposite(AlphaComposite.DstIn); g2.setPaint(new GradientPaint(0, 0, new Color(0, 0, 0, 0f), 0, h, new Color(0.1f, 0.8f, 0.8f, 0.5f))); g2.fillRect(0, 0, 1, h); g2.dispose(); } @Override public void paint(Graphics g) { if (img == null || img.getWidth() != getWidth() || img.getHeight() != getHeight()) { img = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB); } Graphics2D g2 = img.createGraphics(); super.paint(g2); Rectangle bounds = getViewport().getVisibleRect(); g2.scale(bounds.getWidth(), -1); int y = (getColumnHeader() == null) ? 0 : getColumnHeader().getHeight(); g2.drawImage(shadow, bounds.x, -bounds.y - y - h, null); g2.scale(1, -1); g2.drawImage(shadow, bounds.x, bounds.y + bounds.height - h + y, null); g2.dispose(); g.drawImage(img, 0, 0, null); } }
像这样的东西…有点黑客。
class GradientViewPort extends JScrollPane { private static final long serialVersionUID = 1L; private final int h = 50; private BufferedImage img = null; private BufferedImage imgBottom = null; private BufferedImage shadow = new BufferedImage(1, h, BufferedImage.TYPE_INT_ARGB); private BufferedImage shadowBottom = new BufferedImage(1, h, BufferedImage.TYPE_INT_ARGB); private JViewport viewPort; public GradientViewPort(JComponent com) { super(com); viewPort = this.getViewport(); viewPort.setScrollMode(JViewport.BLIT_SCROLL_MODE); viewPort.setScrollMode(JViewport.BACKINGSTORE_SCROLL_MODE); viewPort.setScrollMode(JViewport.SIMPLE_SCROLL_MODE); createShadow(new Color(250, 150, 150),shadow); createShadow(Color.BLUE,shadowBottom); } private void createShadow(Color color, BufferedImage shadow) { Graphics2D g2 = shadow.createGraphics(); g2.setPaint(color); g2.fillRect(0, 0, 1, h); g2.setComposite(AlphaComposite.DstIn); g2.setPaint(new GradientPaint(0, 0, new Color(0, 0, 0, 0f), 0, h, new Color(0.5f, 0.8f, 0.8f, 0.5f))); g2.fillRect(0, 0, 1, h); g2.dispose(); } @Override public void paint(Graphics g) { paintTop(g,img); paintBottom(g,imgBottom); } private void paintBottom(Graphics g,BufferedImage img) { if (img == null || img.getWidth() != getWidth() || img.getHeight() != getHeight()) { img = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB); } Graphics2D g2 = img.createGraphics(); //super.paint(g2); Rectangle bounds = getViewport().getVisibleRect(); g2.scale(bounds.getWidth(), -1); int y = (getColumnHeader() == null) ? 0 : getColumnHeader().getHeight(); //g2.drawImage(shadowBottom, bounds.x, -bounds.y - y - h, null); g2.scale(1, -1); g2.drawImage(shadowBottom, bounds.x, bounds.y + bounds.height - h + y, null); g2.dispose(); g.drawImage(img, 0, 0, null); } private void paintTop(Graphics g,BufferedImage img) { if (img == null || img.getWidth() != getWidth() || img.getHeight() != getHeight()) { img = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB); } Graphics2D g2 = img.createGraphics(); super.paint(g2); Rectangle bounds = getViewport().getVisibleRect(); g2.scale(bounds.getWidth(), -1); int y = (getColumnHeader() == null) ? 0 : getColumnHeader().getHeight(); g2.drawImage(shadow, bounds.x, -bounds.y - y - h, null); g2.scale(1, -1); //g2.drawImage(shadow, bounds.x, bounds.y + bounds.height - h + y, null); g2.dispose(); g.drawImage(img, 0, 0, null); }
编辑固定的代码，当第一行和最后一行在视图端口颜色是红色时，他们不是颜色是蓝色的。
class GradientViewPort extends JScrollPane { private static final long serialVersionUID = 1L; private final int h = 50; private BufferedImage imgRed = null; private BufferedImage imgBlue = null; private BufferedImage shadowRed = new BufferedImage(1, h, BufferedImage.TYPE_INT_ARGB); private BufferedImage shadowBlue = new BufferedImage(1, h, BufferedImage.TYPE_INT_ARGB); private JViewport viewPort; private boolean recVisible = true; public GradientViewPort(JComponent com) { super(com); viewPort = this.getViewport(); viewPort.setScrollMode(JViewport.BLIT_SCROLL_MODE); viewPort.setScrollMode(JViewport.BACKINGSTORE_SCROLL_MODE); viewPort.setScrollMode(JViewport.SIMPLE_SCROLL_MODE); createShadow(new Color(250, 150, 150),shadowRed); createShadow(Color.BLUE,shadowBlue); final JTable table = (JTable) com; viewport.addChangeListener(new ChangeListener() { @Override public void stateChanged(ChangeEvent e) { Rectangle RECT = table.getCellRect(0, 0, true); Rectangle viewRect = viewport.getViewRect(); if (viewRect.intersects(RECT)) { System.out.println("Visible RECT -> " + RECT); recVisible = true; } else { recVisible = false; } } }); } private void createShadow(Color color, BufferedImage shadow) { Graphics2D g2 = shadow.createGraphics(); g2.setPaint(color); g2.fillRect(0, 0, 1, h); g2.setComposite(AlphaComposite.DstIn); g2.setPaint(new GradientPaint(0, 0, new Color(0, 0, 0, 0f), 0, h, new Color(0.5f, 0.8f, 0.8f, 0.5f))); g2.fillRect(0, 0, 1, h); g2.dispose(); } @Override public void paint(Graphics g) { if(recVisible){ paintShadow(g,imgRed,shadowRed); } else { paintShadow(g,imgBlue,shadowBlue); } } private void paintShadow(Graphics g,BufferedImage img, BufferedImage shadow) { if (img == null || img.getWidth() != getWidth() || img.getHeight() != getHeight()) { img = new BufferedImage(getWidth(), getHeight(), BufferedImage.TYPE_INT_ARGB); } Graphics2D g2 = img.createGraphics(); super.paint(g2); Rectangle bounds = getViewport().getVisibleRect(); g2.scale(bounds.getWidth(), -1); int y = (getColumnHeader() == null) ? 0 : getColumnHeader().getHeight(); g2.drawImage(shadow, bounds.x, -bounds.y - y - h, null); g2.scale(1, -1); g2.drawImage(shadow, bounds.x, bounds.y + bounds.height - h + y, null); g2.dispose(); g.drawImage(img, 0, 0, null); } }
