JSCrollbar重绘
实现起来还是非常简单的，首先是从BasicScrollBarUI类派生出一个子类，然后重写其中的相关方法就行了。接着在需要使用滚动条的地方用setUI方法直接载入就行了。例如
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JScrollPane spa = new JScrollPane(list);
spa.getVerticalScrollBar().setUI(new CBScrollBarUI());
JScrollPane spa = new JScrollPane(list);
spa.getVerticalScrollBar().setUI(new CBScrollBarUI());
好了，不多说了，还是看代码吧，相关的内容我有做注释
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package ui.control;
import images.ImageLoader;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.geom.Point2D;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JScrollBar;
import javax.swing.plaf.basic.BasicArrowButton;
import javax.swing.plaf.basic.BasicScrollBarUI;
public class CBScrollBarUI extends BasicScrollBarUI
{
private Color frameColor = new Color(145, 105, 55);
public Dimension getPreferredSize(JComponent c)
{
return new Dimension(16, 16);
}
// 重绘滚动条的滑块
public void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds)
{
super.paintThumb(g, c, thumbBounds);
int tw = thumbBounds.width;
int th = thumbBounds.height;
// 重定图形上下文的原点，这句一定要写，不然会出现拖动滑块时滑块不动的现象
g.translate(thumbBounds.x, thumbBounds.y);
Graphics2D g2 = (Graphics2D) g;
GradientPaint gp = null;
if (this.scrollbar.getOrientation() == JScrollBar.VERTICAL)
{
gp = new GradientPaint(0, 0, new Color(242, 222, 198), tw, 0, new Color(207, 190, 164));
}
if (this.scrollbar.getOrientation() == JScrollBar.HORIZONTAL)
{
gp = new GradientPaint(0, 0, new Color(242, 222, 198), 0, th, new Color(207, 190, 164));
}
g2.setPaint(gp);
g2.fillRoundRect(0, 0, tw - 1, th - 1, 5, 5);
g2.setColor(frameColor);
g2.drawRoundRect(0, 0, tw - 1, th - 1, 5, 5);
}
// 重绘滑块的滑动区域背景
public void paintTrack(Graphics g, JComponent c, Rectangle trackBounds)
{
Graphics2D g2 = (Graphics2D) g;
GradientPaint gp = null;
if (this.scrollbar.getOrientation() == JScrollBar.VERTICAL)
{
gp = new GradientPaint(0, 0, new Color(198, 178, 151), trackBounds.width, 0, new Color(234, 214, 190));
}
if (this.scrollbar.getOrientation() == JScrollBar.HORIZONTAL)
{
gp = new GradientPaint(0, 0, new Color(198, 178, 151), 0, trackBounds.height, new Color(234, 214, 190));
}
g2.setPaint(gp);
g2.fillRect(trackBounds.x, trackBounds.y, trackBounds.width, trackBounds.height);
g2.setColor(new Color(175, 155, 95));
g2.drawRect(trackBounds.x, trackBounds.y, trackBounds.width - 1, trackBounds.height - 1);
if (trackHighlight == BasicScrollBarUI.DECREASE_HIGHLIGHT)
this.paintDecreaseHighlight(g);
if (trackHighlight == BasicScrollBarUI.INCREASE_HIGHLIGHT)
this.paintIncreaseHighlight(g);
}
// 重绘当鼠标点击滑动到向上或向左按钮之间的区域
protected void paintDecreaseHighlight(Graphics g)
{
g.setColor(Color.green);
int x = this.getTrackBounds().x;
int y = this.getTrackBounds().y;
int w = 0, h = 0;
if (this.scrollbar.getOrientation() == JScrollBar.VERTICAL)
{
w = this.getThumbBounds().width;
h = this.getThumbBounds().y - y;
}
if (this.scrollbar.getOrientation() == JScrollBar.HORIZONTAL)
{
w = this.getThumbBounds().x - x;
h = this.getThumbBounds().height;
}
g.fillRect(x, y, w, h);
}
// 重绘当鼠标点击滑块至向下或向右按钮之间的区域
protected void paintIncreaseHighlight(Graphics g)
{
Insets insets = scrollbar.getInsets();
g.setColor(Color.blue);
int x = this.getThumbBounds().x;
int y = this.getThumbBounds().y;
int w = this.getTrackBounds().width;
int h = this.getTrackBounds().height;
g.fillRect(x, y, w, h);
}
protected JButton createIncreaseButton(int orientation)
{
return new BasicArrowButton(orientation)
{
// 重绘按钮的三角标记
public void paintTriangle(Graphics g, int x, int y, int size, int direction, boolean isEnabled)
{
Graphics2D g2 = (Graphics2D) g;
GradientPaint gp = null;
Image arrowImg = null;
switch (this.getDirection())
{
case BasicArrowButton.SOUTH:
gp = new GradientPaint(0, 0, new Color(242, 222, 198), getWidth(), 0, new Color(207, 190, 164));
arrowImg = ImageLoader.get("south.gif");
break;
case BasicArrowButton.EAST:
gp = new GradientPaint(0, 0, new Color(242, 222, 198), 0, getHeight(), new Color(207, 190, 164));
arrowImg = ImageLoader.get("east.gif");
break;
}
g2.setPaint(gp);
g2.fillRect(0, 0, getWidth(), getHeight());
g2.setColor(frameColor);
g2.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
g2.drawImage(arrowImg, (getWidth() - 2) / 2 - 5, (getHeight() - 2) / 2 - 5, 13, 13, null);
}
};
}
protected JButton createDecreaseButton(int orientation)
{
return new BasicArrowButton(orientation)
{
public void paintTriangle(Graphics g, int x, int y, int size, int direction, boolean isEnabled)
{
Graphics2D g2 = (Graphics2D) g;
GradientPaint gp = null;
Image arrowImg = null;
switch (this.getDirection())
{
case BasicArrowButton.NORTH:
gp = new GradientPaint(0, 0, new Color(242, 222, 198), getWidth(), 0, new Color(207, 190, 164));
arrowImg = ImageLoader.get("north.gif");
break;
case BasicArrowButton.WEST:
gp = new GradientPaint(0, 0, new Color(242, 222, 198), 0, getHeight(), new Color(207, 190, 164));
arrowImg = ImageLoader.get("west.gif");
break;
}
g2.setPaint(gp);
g2.fillRect(0, 0, getWidth(), getHeight());
g2.setColor(frameColor);
g2.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
g2.drawImage(arrowImg, (getWidth() - 2) / 2 - 5, (getHeight() - 2) / 2 - 5, 13, 13, null);
}
};
}
}
package ui.control;
import images.ImageLoader;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Insets;
import java.awt.Rectangle;
import java.awt.geom.Point2D;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JScrollBar;
import javax.swing.plaf.basic.BasicArrowButton;
import javax.swing.plaf.basic.BasicScrollBarUI;
public class CBScrollBarUI extends BasicScrollBarUI
{
private Color frameColor = new Color(145, 105, 55);
public Dimension getPreferredSize(JComponent c)
{
return new Dimension(16, 16);
}
// 重绘滚动条的滑块
public void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds)
{
super.paintThumb(g, c, thumbBounds);
int tw = thumbBounds.width;
int th = thumbBounds.height;
// 重定图形上下文的原点，这句一定要写，不然会出现拖动滑块时滑块不动的现象
g.translate(thumbBounds.x, thumbBounds.y);
Graphics2D g2 = (Graphics2D) g;
GradientPaint gp = null;
if (this.scrollbar.getOrientation() == JScrollBar.VERTICAL)
{
gp = new GradientPaint(0, 0, new Color(242, 222, 198), tw, 0, new Color(207, 190, 164));
}
if (this.scrollbar.getOrientation() == JScrollBar.HORIZONTAL)
{
gp = new GradientPaint(0, 0, new Color(242, 222, 198), 0, th, new Color(207, 190, 164));
}
g2.setPaint(gp);
g2.fillRoundRect(0, 0, tw - 1, th - 1, 5, 5);
g2.setColor(frameColor);
g2.drawRoundRect(0, 0, tw - 1, th - 1, 5, 5);
}
// 重绘滑块的滑动区域背景
public void paintTrack(Graphics g, JComponent c, Rectangle trackBounds)
{
Graphics2D g2 = (Graphics2D) g;
GradientPaint gp = null;
if (this.scrollbar.getOrientation() == JScrollBar.VERTICAL)
{
gp = new GradientPaint(0, 0, new Color(198, 178, 151), trackBounds.width, 0, new Color(234, 214, 190));
}
if (this.scrollbar.getOrientation() == JScrollBar.HORIZONTAL)
{
gp = new GradientPaint(0, 0, new Color(198, 178, 151), 0, trackBounds.height, new Color(234, 214, 190));
}
g2.setPaint(gp);
g2.fillRect(trackBounds.x, trackBounds.y, trackBounds.width, trackBounds.height);
g2.setColor(new Color(175, 155, 95));
g2.drawRect(trackBounds.x, trackBounds.y, trackBounds.width - 1, trackBounds.height - 1);
if (trackHighlight == BasicScrollBarUI.DECREASE_HIGHLIGHT)
this.paintDecreaseHighlight(g);
if (trackHighlight == BasicScrollBarUI.INCREASE_HIGHLIGHT)
this.paintIncreaseHighlight(g);
}
// 重绘当鼠标点击滑动到向上或向左按钮之间的区域
protected void paintDecreaseHighlight(Graphics g)
{
g.setColor(Color.green);
int x = this.getTrackBounds().x;
int y = this.getTrackBounds().y;
int w = 0, h = 0;
if (this.scrollbar.getOrientation() == JScrollBar.VERTICAL)
{
w = this.getThumbBounds().width;
h = this.getThumbBounds().y - y;
}
if (this.scrollbar.getOrientation() == JScrollBar.HORIZONTAL)
{
w = this.getThumbBounds().x - x;
h = this.getThumbBounds().height;
}
g.fillRect(x, y, w, h);
}
// 重绘当鼠标点击滑块至向下或向右按钮之间的区域
protected void paintIncreaseHighlight(Graphics g)
{
Insets insets = scrollbar.getInsets();
g.setColor(Color.blue);
int x = this.getThumbBounds().x;
int y = this.getThumbBounds().y;
int w = this.getTrackBounds().width;
int h = this.getTrackBounds().height;
g.fillRect(x, y, w, h);
}
protected JButton createIncreaseButton(int orientation)
{
return new BasicArrowButton(orientation)
{
// 重绘按钮的三角标记
public void paintTriangle(Graphics g, int x, int y, int size, int direction, boolean isEnabled)
{
Graphics2D g2 = (Graphics2D) g;
GradientPaint gp = null;
Image arrowImg = null;
switch (this.getDirection())
{
case BasicArrowButton.SOUTH:
gp = new GradientPaint(0, 0, new Color(242, 222, 198), getWidth(), 0, new Color(207, 190, 164));
arrowImg = ImageLoader.get("south.gif");
break;
case BasicArrowButton.EAST:
gp = new GradientPaint(0, 0, new Color(242, 222, 198), 0, getHeight(), new Color(207, 190, 164));
arrowImg = ImageLoader.get("east.gif");
break;
}
g2.setPaint(gp);
g2.fillRect(0, 0, getWidth(), getHeight());
g2.setColor(frameColor);
g2.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
g2.drawImage(arrowImg, (getWidth() - 2) / 2 - 5, (getHeight() - 2) / 2 - 5, 13, 13, null);
}
};
}
protected JButton createDecreaseButton(int orientation)
{
return new BasicArrowButton(orientation)
{
public void paintTriangle(Graphics g, int x, int y, int size, int direction, boolean isEnabled)
{
Graphics2D g2 = (Graphics2D) g;
GradientPaint gp = null;
Image arrowImg = null;
switch (this.getDirection())
{
case BasicArrowButton.NORTH:
gp = new GradientPaint(0, 0, new Color(242, 222, 198), getWidth(), 0, new Color(207, 190, 164));
arrowImg = ImageLoader.get("north.gif");
break;
case BasicArrowButton.WEST:
gp = new GradientPaint(0, 0, new Color(242, 222, 198), 0, getHeight(), new Color(207, 190, 164));
arrowImg = ImageLoader.get("west.gif");
break;
}
g2.setPaint(gp);
g2.fillRect(0, 0, getWidth(), getHeight());
g2.setColor(frameColor);
g2.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
g2.drawImage(arrowImg, (getWidth() - 2) / 2 - 5, (getHeight() - 2) / 2 - 5, 13, 13, null);
}
};
}
}
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/Greentea107/archive/2011/02/24/6206086.aspx
