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package org.eclipse.swt.examples.paint;
/*
* (c) Copyright IBM Corp. 2000, 2001.
* All Rights Reserved
*/
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import java.util.*;
/**
* The superclass for paint tools that contruct objects from individually
* picked segments.
*/
public abstract class SegmentedPaintSession extends BasicPaintSession {
/**
* The set of control points making up the segmented selection
*/
private Vector /* of Point */ controlPoints = new Vector();
/**
* The previous figure (so that we can abort with right-button)
*/
private Figure previousFigure = null;
/**
* The current figure (so that we can abort with right-button)
*/
private Figure currentFigure = null;
/**
* Constructs a PaintSession.
*
* @param paintSurface the drawing surface to use
*/
protected SegmentedPaintSession(PaintSurface paintSurface) {
super(paintSurface);
}
/**
* Activates the tool.
*/
public void beginSession() {
getPaintSurface().setStatusMessage(PaintPlugin.getResourceString(
"session.SegmentedInteractivePaint.message.anchorMode"));
previousFigure = null;
currentFigure = null;
controlPoints.clear();
}
/**
* Deactivates the tool.
*/
public void endSession() {
getPaintSurface().clearRubberbandSelection();
if (previousFigure != null) getPaintSurface().drawFigure(previousFigure);
}
/**
* Resets the tool.
* Aborts any operation in progress.
*/
public void resetSession() {
getPaintSurface().clearRubberbandSelection();
if (previousFigure != null) getPaintSurface().drawFigure(previousFigure);
getPaintSurface().setStatusMessage(PaintPlugin.getResourceString(
"session.SegmentedInteractivePaint.message.anchorMode"));
previousFigure = null;
currentFigure = null;
controlPoints.clear();
}
/**
* Handles a mouseDown event.
*
* @param event the mouse event detail information
*/
public void mouseDown(MouseEvent event) {
if (event.button != 1) return;
getPaintSurface().setStatusMessage(PaintPlugin.getResourceString(
"session.SegmentedInteractivePaint.message.interactiveMode"));
previousFigure = currentFigure;
if (controlPoints.size() > 0) {
final Point lastPoint = (Point) controlPoints.elementAt(controlPoints.size() - 1);
if (lastPoint.x == event.x || lastPoint.y == event.y) return; // spurious event
}
controlPoints.add(new Point(event.x, event.y));
}
/**
* Handles a mouseDoubleClick event.
*
* @param event the mouse event detail information
*/
public void mouseDoubleClick(MouseEvent event) {
if (event.button != 1) return;
if (controlPoints.size() >= 2) {
getPaintSurface().clearRubberbandSelection();
previousFigure = createFigure(
(Point[]) controlPoints.toArray(new Point[controlPoints.size()]),
controlPoints.size(), true);
}
resetSession();
}
/**
* Handles a mouseUp event.
*
* @param event the mouse event detail information
*/
public void mouseUp(MouseEvent event) {
if (event.button != 1) {
resetSession(); // abort if right or middle mouse button pressed
return;
}
}
/**
* Handles a mouseMove event.
*
* @param event the mouse event detail information
*/
public void mouseMove(MouseEvent event) {
final PaintSurface ps = getPaintSurface();
if (controlPoints.size() == 0) {
ps.setStatusCoord(ps.getCurrentPosition());
return; // spurious event
} else {
ps.setStatusCoordRange((Point) controlPoints.elementAt(controlPoints.size() - 1),
ps.getCurrentPosition());
}
ps.clearRubberbandSelection();
Point[] points = (Point[]) controlPoints.toArray(new Point[controlPoints.size() + 1]);
points[controlPoints.size()] = ps.getCurrentPosition();
currentFigure = createFigure(points, points.length, false);
ps.addRubberbandSelection(currentFigure);
}
/**
* Template Method: Creates a Figure for drawing rubberband entities and the final product
*
* @param points the array of control points
* @param numPoints the number of valid points in the array (n >= 2)
* @param closed true if the user double-clicked on the final control point
*/
protected abstract Figure createFigure(Point[] points, int numPoints, boolean closed);
}
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