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SpinButton.java
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SpinButton.java
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//
// This is the tabs for my spinbutton
// (c) Jimmy Larsson 1998
//
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
public final class SpinButton extends Canvas implements MouseListener
{
protected final int BUTTON_INSET_X = 2;
protected final int BUTTON_INSET_Y = 2;
protected final int TEXT_INSET = 3;
protected final int BUTTON2_STEP = 10;
protected Image buffer = null;
protected int maxValue;
protected int minValue;
protected int value;
protected Color background = null;
protected Rectangle upRect;
protected Rectangle downRect;
protected boolean fixedSize;
protected int buttonWidth;
protected int buttonHeight;
protected Image arrowUp;
protected Image arrowDown;
// Create a Spinbutton with variable size
public SpinButton (int min, int max, int start)
{
maxValue = max;
minValue = min;
value = start;
if (value > maxValue)
value = maxValue;
if (value < minValue)
value = minValue;
fixedSize = false;
// This is crap..... should implement preferredSize and minimumSize!!!!!!!
setSize (300,100);
addMouseListener(this);
// Create button images
int w = 7;
int h = 4;
int upPixels[] = {0,0,0,100,0,0,0, 0,0,100,100,100,0,0, 0,100,100,100,100,100,0, 100,100,1,1,1,1,1};
arrowUp = createImage(new MemoryImageSource (w, h, upPixels, 0, w));
int downPixels[] = {1,1,1,1,1,1,1, 0,1,1,1,1,1,0, 0,0,1,1,1,0,0, 0,0,0,1,0,0,0};
arrowDown = createImage(new MemoryImageSource (w, h, downPixels, 0, w));
}
// Create a spinbutton with fixed size
public SpinButton (int min, int max, int start, int width, int height)
{
this(min, max, start);
fixedSize = true;
buttonWidth = width;
buttonHeight = height;
}
public int getValue ()
{
return value;
}
public void update(Graphics g)
{
paint(g);
}
public void paint (Graphics realG)
{
if (buffer == null)
{
buffer = createImage(getSize().width, getSize().height);
MediaTracker tr = new MediaTracker(this);
tr.addImage(buffer,1);
tr.addImage(arrowUp,2);
tr.addImage(arrowDown,3);
try {
tr.waitForID(1);
tr.waitForID(2);
tr.waitForID(3);
}catch(InterruptedException exp){}
}
if (background == null)
background = getBackground();
// Paint everything into an invisible buffer first
Graphics g = buffer.getGraphics();
super.paint(g);
int middle = getSize().height / 2;
int stringWidth = g.getFontMetrics().stringWidth(String.valueOf(value)) + TEXT_INSET;
int stringX = 0;
Polygon upArrow = new Polygon ();
Polygon downArrow = new Polygon ();
if (fixedSize)
{
int xUp = BUTTON_INSET_X;
int yUp = middle - buttonHeight - 1;
int widthUp = buttonWidth;
int heightUp = buttonHeight;
int xDown = xUp;
int yDown = middle + 1;
int widthDown = widthUp;
int heightDown = heightUp;
upRect = new Rectangle (xUp, yUp, widthUp, heightUp);
downRect = new Rectangle (xDown, yDown, widthDown, heightDown);
stringX = buttonWidth + TEXT_INSET + BUTTON_INSET_X;
} else
{
int rectWidth = getSize().width - BUTTON_INSET_X - stringWidth - TEXT_INSET;
upRect = new Rectangle (BUTTON_INSET_X, BUTTON_INSET_Y, rectWidth, middle - 1 - BUTTON_INSET_Y);
downRect = new Rectangle (BUTTON_INSET_X, middle + 1, rectWidth, middle - BUTTON_INSET_Y - 1);
stringX = rectWidth + BUTTON_INSET_X + TEXT_INSET;
}
g.setColor(background);
g.draw3DRect(upRect.x, upRect.y, upRect.width, upRect.height, true);
g.draw3DRect(downRect.x, downRect.y, downRect.width, downRect.height, true);
g.setColor(Color.black);
g.drawString(String.valueOf(value), stringX, middle + g.getFontMetrics().getAscent() / 2);
// Draw the arrows
int XMiddle = upRect.x + upRect.width/2;
int upYMiddle = upRect.y + upRect.height/2;
int downYMiddle = downRect.y + downRect.height/2;
upArrow.addPoint(XMiddle, upYMiddle - 2);
upArrow.addPoint(XMiddle + 4, upYMiddle + 2);
upArrow.addPoint(XMiddle - 4, upYMiddle + 2);
downArrow.addPoint(XMiddle, downYMiddle + 2);
downArrow.addPoint(XMiddle + 4, downYMiddle - 2);
downArrow.addPoint(XMiddle - 4, downYMiddle - 2);
g.fillPolygon(upArrow);
g.fillPolygon(downArrow);
realG.drawImage(buffer, 0, 0, null);
g.dispose();
buffer = null;
}
// The Mouse listener interface
public void mouseEntered (MouseEvent e) {}
public void mouseExited (MouseEvent e) {}
public void mousePressed (MouseEvent e) {}
public void mouseReleased (MouseEvent e) {}
public void mouseClicked (MouseEvent e)
{
Point p = e.getPoint();
int button2 = e.getModifiers() & InputEvent.BUTTON2_MASK;
if (button2 == 0)
{
if (upRect.contains(p) && value < maxValue)
value++;
if (downRect.contains(p) && value > minValue)
value--;
} else
{
if (upRect.contains(p) && value < maxValue)
if (maxValue - value > BUTTON2_STEP)
{
value = value + BUTTON2_STEP;
} else
{
value = value + (maxValue - value);
}
if (downRect.contains(p) && value > minValue)
if (value - minValue > BUTTON2_STEP)
{
value = value - BUTTON2_STEP;
} else
{
value = value - (value - minValue);
}
}
invalidate();
repaint();
}
// A main for testing the spinbutton
public static void main (String[] args)
{
Frame f = new Frame("Spinbutton-test");
f.setLayout(new BorderLayout());
SpinButton sb = new SpinButton(0,99,5, 12, 12);
f.add("Center",sb);
f.setSize(400,80);
//f.pack();
f.show();
}
}