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Arrow Button
import javax.swing.*;
import java.awt.*;
/**
* A button which paints on it one or more scaled arrows in one of the cardinal directions.
* @author Adrian BER
*/
public class ArrowButton extends JButton {
/** The cardinal direction of the arrow(s). */
private int direction;
/** The number of arrows. */
private int arrowCount;
/** The arrow size. */
private int arrowSize;
public ArrowButton(int direction, int arrowCount, int arrowSize) {
setMargin(new Insets(0, 2, 0, 2));
setBorder(BorderFactory.createEmptyBorder(2, 2, 2, 2));
this.direction = direction;
this.arrowCount = arrowCount;
this.arrowSize = arrowSize;
}
/** Returns the cardinal direction of the arrow(s).
* @see #setDirection(int)
*/
public int getDirection() {
return direction;
}
/** Sets the cardinal direction of the arrow(s).
* @param direction the direction of the arrow(s), can be SwingConstants.NORTH,
* SwingConstants.SOUTH, SwingConstants.WEST or SwingConstants.EAST
* @see #getDirection()
*/
public void setDirection(int direction) {
this.direction = direction;
}
/** Returns the number of arrows. */
public int getArrowCount() {
return arrowCount;
}
/** Sets the number of arrows. */
public void setArrowCount(int arrowCount) {
this.arrowCount = arrowCount;
}
/** Returns the arrow size. */
public int getArrowSize() {
return arrowSize;
}
/** Sets the arrow size. */
public void setArrowSize(int arrowSize) {
this.arrowSize = arrowSize;
}
public Dimension getPreferredSize() {
return getMinimumSize();
}
public Dimension getMinimumSize() {
return new Dimension(
arrowSize * (direction == SwingConstants.EAST
|| direction == SwingConstants.WEST ? arrowCount : 3)
+ getBorder().getBorderInsets(this).left
+ getBorder().getBorderInsets(this).right
,
arrowSize * (direction == SwingConstants.NORTH
|| direction == SwingConstants.SOUTH ? arrowCount : 3)
+ getBorder().getBorderInsets(this).top
+ getBorder().getBorderInsets(this).bottom
);
}
public Dimension getMaximumSize() {
return getMinimumSize();
}
protected void paintComponent(Graphics g) {
// this will paint the background
super.paintComponent(g);
Color oldColor = g.getColor();
g.setColor(isEnabled() ? getForeground() : getForeground().brighter());
// paint the arrows
int w = getSize().width;
int h = getSize().height;
for (int i = 0; i < arrowCount; i++) {
paintArrow(g,
(w - arrowSize * (direction == SwingConstants.EAST
|| direction == SwingConstants.WEST ? arrowCount : 1)) / 2
+ arrowSize * (direction == SwingConstants.EAST
|| direction == SwingConstants.WEST ? i : 0),
(h - arrowSize * (direction == SwingConstants.EAST
|| direction == SwingConstants.WEST ? 1 : arrowCount)) / 2
+ arrowSize * (direction == SwingConstants.EAST
|| direction == SwingConstants.WEST ? 0 : i),
g.getColor());
}
g.setColor(oldColor);
}
private void paintArrow(Graphics g, int x, int y, Color highlight) {
int mid, i, j;
Color oldColor = g.getColor();
boolean isEnabled = isEnabled();
j = 0;
arrowSize = Math.max(arrowSize, 2);
mid = (arrowSize / 2) - 1;
g.translate(x, y);
switch (direction) {
case NORTH:
for (i = 0; i < arrowSize; i++) {
g.drawLine(mid - i, i, mid + i, i);
}
if(!isEnabled) {
g.setColor(highlight);
g.drawLine(mid-i+2, i, mid+i, i);
}
break;
case SOUTH:
if (!isEnabled) {
g.translate(1, 1);
g.setColor(highlight);
for (i = arrowSize - 1; i >= 0; i--) {
g.drawLine(mid - i, j, mid + i, j);
j++;
}
g.translate(-1, -1);
g.setColor(oldColor);
}
j = 0;
for (i = arrowSize - 1; i >= 0; i--) {
g.drawLine(mid - i, j, mid + i, j);
j++;
}
break;
case WEST:
for (i = 0; i < arrowSize; i++) {
g.drawLine(i, mid - i, i, mid + i);
}
if(!isEnabled) {
g.setColor(highlight);
g.drawLine(i, mid-i+2, i, mid+i);
}
break;
case EAST:
if(!isEnabled) {
g.translate(1, 1);
g.setColor(highlight);
for(i = arrowSize-1; i >= 0; i--) {
g.drawLine(j, mid-i, j, mid+i);
j++;
}
g.translate(-1, -1);
g.setColor(oldColor);
}
j = 0;
for (i = arrowSize - 1; i >= 0; i--) {
g.drawLine(j, mid - i, j, mid + i);
j++;
}
break;
}
g.translate(-x, -y);
g.setColor(oldColor);
}
}
