/* 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.data.Value;
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 ShiftRegisterPoker extends InstancePoker {
private int loc;
@Override
public boolean init(InstanceState state, MouseEvent e) {
loc = computeStage(state, e);
return loc >= 0;
}
private int computeStage(InstanceState state, MouseEvent e) {
Integer lenObj = state.getAttributeValue(ShiftRegister.ATTR_LENGTH);
BitWidth widObj = state.getAttributeValue(StdAttr.WIDTH);
Boolean loadObj = state.getAttributeValue(ShiftRegister.ATTR_LOAD);
Bounds bds = state.getInstance().getBounds();
int y = bds.getY();
String label = state.getAttributeValue(StdAttr.LABEL);
if (label == null || label.equals("")) y += bds.getHeight() / 2;
else y += 3 * bds.getHeight() / 4;
y = e.getY() - y;
if (y <= -6 || y >= 8) return -1;
int x = e.getX() - (bds.getX() + 15);
if (!loadObj.booleanValue() || widObj.getWidth() > 4) return -1;
if (x < 0 || x >= lenObj.intValue() * 10) return -1;
return x / 10;
}
@Override
public void paint(InstancePainter painter) {
int loc = this.loc;
if (loc < 0) return;
Bounds bds = painter.getInstance().getBounds();
int x = bds.getX() + 15 + loc * 10;
int y = bds.getY();
String label = painter.getAttributeValue(StdAttr.LABEL);
if (label == null || label.equals("")) y += bds.getHeight() / 2;
else y += 3 * bds.getHeight() / 4;
Graphics g = painter.getGraphics();
g.setColor(Color.RED);
g.drawRect(x, y - 6, 10, 13);
}
@Override
public void mousePressed(InstanceState state, MouseEvent e) {
loc = computeStage(state, e);
}
@Override
public void mouseReleased(InstanceState state, MouseEvent e) {
int oldLoc = loc;
if (oldLoc < 0) return;
BitWidth widObj = state.getAttributeValue(StdAttr.WIDTH);
if (widObj.equals(BitWidth.ONE)) {
int newLoc = computeStage(state, e);
if (oldLoc == newLoc) {
ShiftRegisterData data = (ShiftRegisterData) state.getData();
int i = data.getLength() - 1 - loc;
Value v = data.get(i);
if (v == Value.FALSE) v = Value.TRUE;
else v = Value.FALSE;
data.set(i, v);
state.fireInvalidated();
}
}
}
@Override
public void keyTyped(InstanceState state, KeyEvent e) {
int loc = this.loc;
if (loc < 0) return;
char c = e.getKeyChar();
if (c == ' ') {
Integer lenObj = state.getAttributeValue(ShiftRegister.ATTR_LENGTH);
if (loc < lenObj.intValue() - 1) {
this.loc = loc + 1;
state.fireInvalidated();
}
} else if (c == '\u0008') {
if (loc > 0) {
this.loc = loc - 1;
state.fireInvalidated();
}
} else {
try {
int val = Integer.parseInt("" + e.getKeyChar(), 16);
BitWidth widObj = state.getAttributeValue(StdAttr.WIDTH);
if ((val & ~widObj.getMask()) != 0) return;
Value valObj = Value.createKnown(widObj, val);
ShiftRegisterData data = (ShiftRegisterData) state.getData();
int i = data.getLength() - 1 - loc;
if (!data.get(i).equals(valObj)) {
data.set(i, valObj);
state.fireInvalidated();
}
} catch (NumberFormatException ex) {
return;
}
}
}
}