/* 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.draw.canvas;
import java.awt.Graphics;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import com.cburch.draw.model.CanvasModelEvent;
import com.cburch.draw.model.CanvasObject;
import com.cburch.draw.model.Handle;
import com.cburch.draw.model.HandleGesture;
import com.cburch.logisim.data.Location;
public class Selection {
private static final String MOVING_HANDLE = "movingHandle";
private static final String TRANSLATING = "translating";
private static final String HIDDEN = "hidden";
private List<SelectionListener> listeners;
private Set<CanvasObject> selected;
private Set<CanvasObject> selectedView;
private Map<CanvasObject, String> suppressed;
private Set<CanvasObject> suppressedView;
private Handle selectedHandle;
private HandleGesture curHandleGesture;
private int moveDx;
private int moveDy;
protected Selection() {
listeners = new ArrayList<SelectionListener>();
selected = new HashSet<CanvasObject>();
suppressed = new HashMap<CanvasObject, String>();
selectedView = Collections.unmodifiableSet(selected);
suppressedView = Collections.unmodifiableSet(suppressed.keySet());
}
public void addSelectionListener(SelectionListener l) {
listeners.add(l);
}
public void removeSelectionListener(SelectionListener l) {
listeners.remove(l);
}
private void fireChanged(int action, Collection<CanvasObject> affected) {
SelectionEvent e = null;
for (SelectionListener listener : listeners) {
if (e == null) {
e = new SelectionEvent(this, action, affected);
}
listener.selectionChanged(e);
}
}
public boolean isEmpty() {
return selected.isEmpty();
}
public boolean isSelected(CanvasObject shape) {
return selected.contains(shape);
}
public Set<CanvasObject> getSelected() {
return selectedView;
}
public void clearSelected() {
if (!selected.isEmpty()) {
List<CanvasObject> oldSelected;
oldSelected = new ArrayList<CanvasObject>(selected);
selected.clear();
suppressed.clear();
setHandleSelected(null);
fireChanged(SelectionEvent.ACTION_REMOVED, oldSelected);
}
}
public void setSelected(CanvasObject shape, boolean value) {
setSelected(Collections.singleton(shape), value);
}
public void setSelected(Collection<CanvasObject> shapes, boolean value) {
if (value) {
ArrayList<CanvasObject> added;
added = new ArrayList<CanvasObject>(shapes.size());
for (CanvasObject shape : shapes) {
if (selected.add(shape)) {
added.add(shape);
}
}
if (!added.isEmpty()) {
fireChanged(SelectionEvent.ACTION_ADDED, added);
}
} else {
List<CanvasObject> removed;
removed = new ArrayList<CanvasObject>(shapes.size());
for (CanvasObject shape : shapes) {
if (selected.remove(shape)) {
suppressed.remove(shape);
Handle h = selectedHandle;
if (h != null && h.getObject() == shape) {
setHandleSelected(null);
}
removed.add(shape);
}
}
if (!removed.isEmpty()) {
fireChanged(SelectionEvent.ACTION_REMOVED, removed);
}
}
}
public void toggleSelected(Collection<CanvasObject> shapes) {
List<CanvasObject> added;
added = new ArrayList<CanvasObject>(shapes.size());
List<CanvasObject> removed;
removed = new ArrayList<CanvasObject>(shapes.size());
for (CanvasObject shape : shapes) {
if (selected.contains(shape)) {
selected.remove(shape);
suppressed.remove(shape);
Handle h = selectedHandle;
if (h != null && h.getObject() == shape) {
setHandleSelected(null);
}
removed.add(shape);
} else {
selected.add(shape);
added.add(shape);
}
}
if (!removed.isEmpty()) {
fireChanged(SelectionEvent.ACTION_REMOVED, removed);
}
if (!added.isEmpty()) {
fireChanged(SelectionEvent.ACTION_ADDED, added);
}
}
public Set<CanvasObject> getDrawsSuppressed() {
return suppressedView;
}
public void clearDrawsSuppressed() {
suppressed.clear();
curHandleGesture = null;
}
public Handle getSelectedHandle() {
return selectedHandle;
}
public void setHandleSelected(Handle handle) {
Handle cur = selectedHandle;
boolean same = cur == null ? handle == null : cur.equals(handle);
if (!same) {
selectedHandle = handle;
curHandleGesture = null;
Collection<CanvasObject> objs;
if (handle == null) {
objs = Collections.emptySet();
} else {
objs = Collections.singleton(handle.getObject());
}
fireChanged(SelectionEvent.ACTION_HANDLE, objs);
}
}
public void setHandleGesture(HandleGesture gesture) {
HandleGesture g = curHandleGesture;
if (g != null) {
suppressed.remove(g.getHandle().getObject());
}
Handle h = gesture.getHandle();
suppressed.put(h.getObject(), MOVING_HANDLE);
curHandleGesture = gesture;
}
public void setMovingShapes(Collection<? extends CanvasObject> shapes, int dx, int dy) {
for (CanvasObject o : shapes) {
suppressed.put(o, TRANSLATING);
}
moveDx = dx;
moveDy = dy;
}
public void setHidden(Collection<? extends CanvasObject> shapes, boolean value) {
if (value) {
for (CanvasObject o : shapes) {
suppressed.put(o, HIDDEN);
}
} else {
suppressed.keySet().removeAll(shapes);
}
}
public Location getMovingDelta() {
return Location.create(moveDx, moveDy);
}
public void setMovingDelta(int dx, int dy) {
moveDx = dx;
moveDy = dy;
}
public void drawSuppressed(Graphics g, CanvasObject shape) {
String state = suppressed.get(shape);
if (state.equals(MOVING_HANDLE)) {
shape.paint(g, curHandleGesture);
} else if (state.equals(TRANSLATING)) {
g.translate(moveDx, moveDy);
shape.paint(g, null);
}
}
void modelChanged(CanvasModelEvent event) {
int action = event.getAction();
switch (action) {
case CanvasModelEvent.ACTION_REMOVED:
Collection<? extends CanvasObject> affected = event.getAffected();
if (affected != null) {
selected.removeAll(affected);
suppressed.keySet().removeAll(affected);
Handle h = selectedHandle;
if (h != null && affected.contains(h.getObject())) {
setHandleSelected(null);
}
}
break;
case CanvasModelEvent.ACTION_HANDLE_DELETED:
if (event.getHandle().equals(selectedHandle)) {
setHandleSelected(null);
}
break;
case CanvasModelEvent.ACTION_HANDLE_MOVED:
HandleGesture gesture = event.getHandleGesture();
if (gesture.getHandle().equals(selectedHandle)) {
setHandleSelected(gesture.getResultingHandle());
}
break;
default:
break;
}
}
}