bundles/org.eclipse.swt/Eclipse SWT/carbon/org/eclipse/swt/widgets/Tracker.java

package org.eclipse.swt.widgets;

/*
 * Copyright (c) 2000, 2002 IBM Corp.  All rights reserved.
 * This file is made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 */
 
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;

public class Tracker extends Widget {
		Control parent;
		Display display;
		boolean tracking, stippled;
		Rectangle [] rectangles, proportions;
		int cursorOrientation = SWT.NONE;

public Tracker (Composite parent, int style) {
	super (parent, checkStyle (style));
	this.parent = parent;
	display = parent.getDisplay ();
}

public Tracker (Display display, int style) {
	if (display == null) display = Display.getCurrent ();
	if (display == null) display = Display.getDefault ();
	if (!display.isValidThread ()) {
		error (SWT.ERROR_THREAD_INVALID_ACCESS);
	}
	this.style = checkStyle (style);
	this.display = display;
}

public void addControlListener (ControlListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	TypedListener typedListener = new TypedListener (listener);
	addListener (SWT.Move,typedListener);
}

Point adjustMoveCursor (int xDisplay, int xWindow) {
	return new Point (0, 0);
}

Point adjustResizeCursor (int xDisplay, int xWindow) {
	return new Point (0, 0);
}

static int checkStyle (int style) {
	if ((style & (SWT.LEFT | SWT.RIGHT | SWT.UP | SWT.DOWN)) == 0) {
		style |= SWT.LEFT | SWT.RIGHT | SWT.UP | SWT.DOWN;
	}
	return style;
}

public void close () {
	checkWidget ();
	tracking = false;
}
Rectangle computeBounds () {
	int xMin = rectangles [0].x;
	int yMin = rectangles [0].y;
	int xMax = rectangles [0].x + rectangles [0].width;
	int yMax = rectangles [0].y + rectangles [0].height;
	
	for (int i = 1; i < rectangles.length; i++) {
		if (rectangles [i].x < xMin) xMin = rectangles [i].x;
		if (rectangles [i].y < yMin) yMin = rectangles [i].y;
		int rectRight = rectangles [i].x + rectangles [i].width;
		if (rectRight > xMax) xMax = rectRight;		
		int rectBottom = rectangles [i].y + rectangles [i].height;
		if (rectBottom > yMax) yMax = rectBottom;
	}
	
	return new Rectangle (xMin, yMin, xMax - xMin, yMax - yMin);
}

Rectangle [] computeProportions (Rectangle [] rects) {
	Rectangle [] result = new Rectangle [rects.length];
	Rectangle bounds = computeBounds ();
	for (int i = 0; i < rects.length; i++) {
		result[i] = new Rectangle (
			(rects[i].x - bounds.x) * 100 / bounds.width,
			(rects[i].y - bounds.y) * 100 / bounds.height,
			rects[i].width * 100 / bounds.width,
			rects[i].height * 100 / bounds.height);
	}
	return result;
}

void drawRectangles () {
	if (parent != null) {
		if (parent.isDisposed ()) return;
		parent.getShell ().update ();
	} else {
		display.update ();
	}
}

public Display getDisplay () {
	return display;
}

public Rectangle [] getRectangles () {
	checkWidget ();
	return rectangles;
}

public boolean getStippled () {
	checkWidget ();
	return stippled;
}

void moveRectangles (int xChange, int yChange) {
	if (xChange < 0 && ((style & SWT.LEFT) == 0)) return;
	if (xChange > 0 && ((style & SWT.RIGHT) == 0)) return;
	if (yChange < 0 && ((style & SWT.UP) == 0)) return;
	if (yChange > 0 && ((style & SWT.DOWN) == 0)) return;
	for (int i = 0; i < rectangles.length; i++) {
		rectangles [i].x += xChange;
		rectangles [i].y += yChange;
	}
}

public boolean open () {
	checkWidget ();
	if (rectangles == null) return false;
	return false;
}

public void removeControlListener (ControlListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Move, listener);
}

void resizeRectangles (int xChange, int yChange) {
	/*
	* If the cursor orientation has not been set in the orientation of
	* this change then try to set it here.
	*/
	if (xChange < 0 && ((style & SWT.LEFT) != 0) && ((cursorOrientation & SWT.RIGHT) == 0)) {
		cursorOrientation |= SWT.LEFT;
	} else if (xChange > 0 && ((style & SWT.RIGHT) != 0) && ((cursorOrientation & SWT.LEFT) == 0)) {
		cursorOrientation |= SWT.RIGHT;
	} else if (yChange < 0 && ((style & SWT.UP) != 0) && ((cursorOrientation & SWT.DOWN) == 0)) {
		cursorOrientation |= SWT.UP;
	} else if (yChange > 0 && ((style & SWT.DOWN) != 0) && ((cursorOrientation & SWT.UP) == 0)) {
		cursorOrientation |= SWT.DOWN;
	}
	Rectangle bounds = computeBounds ();
	if ((cursorOrientation & SWT.LEFT) != 0) {
		bounds.x += xChange;
		bounds.width -= xChange;
	} else if ((cursorOrientation & SWT.RIGHT) != 0) {
		bounds.width += xChange;
	}
	if ((cursorOrientation & SWT.UP) != 0) {
		bounds.y += yChange;
		bounds.height -= yChange;
	} else if ((cursorOrientation & SWT.DOWN) != 0) {
		bounds.height += yChange;
	}
	/*
	* The following are conditions under which the resize should not be applied
	*/
	if (bounds.width < 0 || bounds.height < 0) return;
	
	Rectangle [] newRects = new Rectangle [rectangles.length];
	for (int i = 0; i < rectangles.length; i++) {
		Rectangle proportion = proportions[i];
		newRects[i] = new Rectangle (
			proportion.x * bounds.width / 100 + bounds.x,
			proportion.y * bounds.height / 100 + bounds.y,
			proportion.width * bounds.width / 100,
			proportion.height * bounds.height / 100);
	}
	rectangles = newRects;	
}

public void setCursor (Cursor value) {
	checkWidget ();
}

public void setRectangles (Rectangle [] rectangles) {
	checkWidget ();
	this.rectangles = rectangles;
	proportions = computeProportions (rectangles);
}

public void setStippled (boolean stippled) {
	checkWidget ();
	this.stippled = stippled;
}
}