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package org.singinst.uf.presenter;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.SortedMap;
import java.util.TreeMap;
import org.singinst.uf.math.SimplePoint;
abstract class ProxyCanvas implements GraphCanvas, MouseDragListener, MouseClickListener {
private final GraphCanvas underlyingCanvas;
private final Set<MouseDragListener> dragListeners = new HashSet<MouseDragListener>();
private final Set<MouseClickListener> clickListeners = new HashSet<MouseClickListener>();
private MouseDragListener selectedDragListener;
ProxyCanvas(GraphCanvas underlyingCanvas) {
this.underlyingCanvas = underlyingCanvas;
}
public void clear() {
getUnderlyingCanvas().clear();
}
public void drawDecorationPoint(SimplePoint point) {
getUnderlyingCanvas().drawDecorationPoint(toUnderlyingCanvas(point));
}
private SimplePoint toUnderlyingCanvas(SimplePoint point) {
return proxyToUnderlyingCanvas().apply(point);
}
private SimplePoint fromUnderlyingCanvas(SimplePoint point) {
return proxyToUnderlyingCanvas().invert(point);
}
abstract GraphTransform proxyToUnderlyingCanvas();
public void drawLine(SimpleLine line) {
getUnderlyingCanvas().drawLine(new SimpleLine(toUnderlyingCanvas(line.p1), toUnderlyingCanvas(line.p2)));
}
public void drawCurve(List<SimplePoint> points) {
List<SimplePoint> underlyingCanvasPoints = new ArrayList<SimplePoint>();
for (SimplePoint point : points) {
underlyingCanvasPoints.add(toUnderlyingCanvas(point));
}
getUnderlyingCanvas().drawCurve(underlyingCanvasPoints);
}
public void addMouseDragListener(final MouseDragListener listener) {
dragListeners.add(listener);
getUnderlyingCanvas().addMouseDragListener(this);
}
public void addMouseClickListener(final MouseClickListener listener) {
clickListeners.add(listener);
getUnderlyingCanvas().addMouseClickListener(this);
}
public void mouseClick(SimplePoint point) {
SimplePoint ourPoint = fromUnderlyingCanvas(point);
for (MouseClickListener listener : clickListeners) {
listener.mouseClick(ourPoint);
}
}
public void dragTo(SimplePoint point) {
SimplePoint ourPoint = fromUnderlyingCanvas(point);
selectedDragListener.dragTo(ourPoint);
}
public int mouseDown(SimplePoint point) {
SimplePoint ourPoint = fromUnderlyingCanvas(point);
SortedMap<Integer, MouseDragListener> listenersByPriority = new TreeMap<Integer, MouseDragListener>();
for (MouseDragListener listener : dragListeners) {
listenersByPriority.put(listener.mouseDown(ourPoint), listener);
}
int maxPriority = listenersByPriority.lastKey();
if (maxPriority > 0) {
selectedDragListener = listenersByPriority.get(maxPriority);
}
return maxPriority;
}
public void invalidate() {
underlyingCanvas.invalidate();
}
public void pushStyle(SimpleStyle style) {
underlyingCanvas.pushStyle(style);
}
public void popStyle() {
underlyingCanvas.popStyle();
}
public GraphCanvas getUnderlyingCanvas() {
return underlyingCanvas;
}
public void write(SimplePoint point, CanvasString canvasString) {
underlyingCanvas.write(toUnderlyingCanvas(point), canvasString);
}
}
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