1 files changed, 129 insertions, 0 deletions
diff --git a/examples/org.eclipse.swt.examples.paint/src/org/eclipse/swt/examples/paint/DragPaintSession.java b/examples/org.eclipse.swt.examples.paint/src/org/eclipse/swt/examples/paint/DragPaintSession.java
new file mode 100755
index 0000000000..2f89450de0
--- /dev/null
+++ b/examples/org.eclipse.swt.examples.paint/src/org/eclipse/swt/examples/paint/DragPaintSession.java
@@ -0,0 +1,129 @@
+package org.eclipse.swt.examples.paint;
+
+/*
+ * (c) Copyright IBM Corp. 2000, 2001.
+ * All Rights Reserved
+ */
+
+import org.eclipse.swt.events.MouseEvent;
+import org.eclipse.swt.graphics.*;
+
+/**
+ * The superclass for paint tools that use click-drag-release motions to
+ * draw objects.
+ */
+public abstract class DragPaintSession extends BasicPaintSession {
+	/**
+	 * True if a click-drag is in progress
+	 */
+	private boolean dragInProgress = false;
+	
+	/**
+	 * The position of the first click in a click-drag
+	 */
+	private Point anchorPosition = new Point(-1, -1);
+
+	/**
+	 * A temporary point
+	 */
+	private Point tempPosition = new Point(-1, -1);
+	
+	/**
+	 * Constructs a PaintSession.
+	 * 
+	 * @param getPaintSurface() the drawing surface to use
+	 */
+	protected DragPaintSession(PaintSurface paintSurface) {
+		super(paintSurface);
+	}
+
+	/**
+	 * Activates the tool.
+	 */
+	public void beginSession() {
+		getPaintSurface().getPaintStatus().
+			setMessage(PaintPlugin.getResourceString("session.DragInteractivePaint.message"));
+		anchorPosition.x = -1;
+		dragInProgress = false;
+	}
+	
+	/**
+	 * Deactivates the tool.
+     */
+	public void endSession() {
+	}
+	
+	/**
+	 * Resets the tool.
+	 * Aborts any operation in progress.
+	 */
+	public void resetSession() {
+		getPaintSurface().clearRubberbandSelection();
+		anchorPosition.x = -1;
+		dragInProgress = false;
+	}
+
+	/**
+	 * Handles a mouseDown event.
+	 * 
+	 * @param event the mouse event detail information
+	 */
+	public void mouseDown(MouseEvent event) {
+		if (event.button != 1) return;
+		if (dragInProgress) return; // spurious event
+		dragInProgress = true;
+		
+		anchorPosition.x = event.x;
+		anchorPosition.y = event.y;
+	}
+
+	/**
+	 * Handles a mouseDoubleClick event.
+	 * 
+	 * @param event the mouse event detail information
+	 */
+	public void mouseDoubleClick(MouseEvent event) {
+	}
+
+	/**
+	 * 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;
+		}
+		if (! dragInProgress) return; // spurious event
+		dragInProgress = false;
+		if (anchorPosition.x == -1) return; // spurious event
+		
+		getPaintSurface().commitRubberbandSelection();
+	}
+	
+	/**
+	 * Handles a mouseMove event.
+	 * 
+	 * @param event the mouse event detail information
+	 */
+	public void mouseMove(MouseEvent event) {
+		final PaintSurface ps = getPaintSurface();
+		if (! dragInProgress) {
+			ps.showCurrentPositionStatus();
+			return;
+		}
+		ps.showCurrentRangeStatus(anchorPosition);
+		ps.clearRubberbandSelection();
+		tempPosition.x = event.x;
+		tempPosition.y = event.y;
+		ps.addRubberbandSelection(createFigure(anchorPosition, tempPosition));
+	}
+	
+	/**
+	 * Template Method: Creates a Figure for drawing rubberband entities and the final product
+	 * 
+	 * @param anchor the anchor point
+	 * @param cursor the point marking the current pointer location
+	 */
+	protected abstract Figure createFigure(Point anchor, Point cursor);
+}