/* Copyright (c) 2010, Carl Burch. License information is located in the
* com.cburch.logisim.Main source code and at www.cburch.com/logisim/. */
package com.cburch.logisim.std.memory;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import com.cburch.logisim.data.BitWidth;
import com.cburch.logisim.data.Bounds;
import com.cburch.logisim.instance.InstancePainter;
import com.cburch.logisim.instance.InstancePoker;
import com.cburch.logisim.instance.InstanceState;
import com.cburch.logisim.instance.StdAttr;
public class RegisterPoker extends InstancePoker {
private int initValue;
private int curValue;
@Override
public boolean init(InstanceState state, MouseEvent e) {
RegisterData data = (RegisterData) state.getData();
if (data == null) {
data = new RegisterData();
state.setData(data);
}
initValue = data.value;
curValue = initValue;
return true;
}
@Override
public void paint(InstancePainter painter) {
Bounds bds = painter.getBounds();
BitWidth dataWidth = painter.getAttributeValue(StdAttr.WIDTH);
int width = dataWidth == null ? 8 : dataWidth.getWidth();
int len = (width + 3) / 4;
Graphics g = painter.getGraphics();
g.setColor(Color.RED);
if (len > 4) {
g.drawRect(bds.getX(), bds.getY() + 3, bds.getWidth(), 25);
} else {
int wid = 7 * len + 2;
g.drawRect(bds.getX() + (bds.getWidth() - wid) / 2, bds.getY() + 4, wid, 15);
}
g.setColor(Color.BLACK);
}
@Override
public void keyTyped(InstanceState state, KeyEvent e) {
int val = Character.digit(e.getKeyChar(), 16);
if (val < 0) return;
BitWidth dataWidth = state.getAttributeValue(StdAttr.WIDTH);
if (dataWidth == null) dataWidth = BitWidth.create(8);
curValue = (curValue * 16 + val) & dataWidth.getMask();
RegisterData data = (RegisterData) state.getData();
data.value = curValue;
state.fireInvalidated();
}
}