/*******************************************************************************
* Copyright (c) 2000, 2009, 2012 IBM Corporation, Gerhardt Informatics Kft. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Gerhardt Informatics Kft. - GEFGWT port
*******************************************************************************/
package org.eclipse.swt.widgets;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.events.ControlListener;
import org.eclipse.swt.events.KeyListener;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.graphics.Rectangle;
/**
* Instances of this class implement rubber banding rectangles that are drawn
* onto a parent <code>Composite</code> or <code>Display</code>. These
* rectangles can be specified to respond to mouse and key events by either
* moving or resizing themselves accordingly. Trackers are typically used to
* represent window geometries in a lightweight manner.
*
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>LEFT, RIGHT, UP, DOWN, RESIZE</dd>
* <dt><b>Events:</b></dt>
* <dd>Move, Resize</dd>
* </dl>
* <p>
* Note: Rectangle move behavior is assumed unless RESIZE is specified.
* </p>
* <p>
* IMPORTANT: This class is <em>not</em> intended to be subclassed.
* </p>
*
* @see <a href="http://www.eclipse.org/swt/snippets/#tracker">Tracker
* snippets</a>
* @see <a href="http://www.eclipse.org/swt/">Sample code and further
* information</a>
* @noextend This class is not intended to be subclassed by clients.
*/
public class Tracker extends Widget {
Composite parent;
Cursor cursor;
long /* int */lastCursor, window;
boolean tracking, cancelled, grabbed, stippled;
Rectangle[] rectangles = new Rectangle[0], proportions = rectangles;
Rectangle bounds;
int cursorOrientation = SWT.NONE;
int oldX, oldY;
final static int STEPSIZE_SMALL = 1;
final static int STEPSIZE_LARGE = 9;
/**
* Constructs a new instance of this class given its parent and a style
* value describing its behavior and appearance.
* <p>
* The style value is either one of the style constants defined in class
* <code>SWT</code> which is applicable to instances of this class, or must
* be built by <em>bitwise OR</em>'ing together (that is, using the
* <code>int</code> "|" operator) two or more of those <code>SWT</code>
* style constants. The class description lists the style constants that are
* applicable to the class. Style bits are also inherited from superclasses.
* </p>
*
* @param parent
* a widget which will be the parent of the new instance (cannot
* be null)
* @param style
* the style of widget to construct
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
* </ul>
* @exception SWTException
* <ul>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the parent</li>
* <li>ERROR_INVALID_SUBCLASS - if this class is not an
* allowed subclass</li>
* </ul>
*
* @see SWT#LEFT
* @see SWT#RIGHT
* @see SWT#UP
* @see SWT#DOWN
* @see SWT#RESIZE
* @see Widget#checkSubclass
* @see Widget#getStyle
*/
public Tracker(Composite parent, int style) {
super(parent, checkStyle(style));
this.parent = parent;
}
/**
* Constructs a new instance of this class given the display to create it on
* and a style value describing its behavior and appearance.
* <p>
* The style value is either one of the style constants defined in class
* <code>SWT</code> which is applicable to instances of this class, or must
* be built by <em>bitwise OR</em>'ing together (that is, using the
* <code>int</code> "|" operator) two or more of those <code>SWT</code>
* style constants. The class description lists the style constants that are
* applicable to the class. Style bits are also inherited from superclasses.
* </p>
* <p>
* Note: Currently, null can be passed in for the display argument. This has
* the effect of creating the tracker on the currently active display if
* there is one. If there is no current display, the tracker is created on a
* "default" display. <b>Passing in null as the display argument is not
* considered to be good coding style, and may not be supported in a future
* release of SWT.</b>
* </p>
*
* @param display
* the display to create the tracker on
* @param style
* the style of control to construct
*
* @exception SWTException
* <ul>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the parent</li>
* <li>ERROR_INVALID_SUBCLASS - if this class is not an
* allowed subclass</li>
* </ul>
*
* @see SWT#LEFT
* @see SWT#RIGHT
* @see SWT#UP
* @see SWT#DOWN
* @see SWT#RESIZE
*/
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;
reskinWidget();
}
/**
* Adds the listener to the collection of listeners who will be notified
* when the control is moved or resized, by sending it one of the messages
* defined in the <code>ControlListener</code> interface.
*
* @param listener
* the listener which should be notified
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
* </ul>
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*
* @see ControlListener
* @see #removeControlListener
*/
public void addControlListener(ControlListener listener) {
checkWidget();
if (listener == null)
error(SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener(listener);
addListener(SWT.Resize, typedListener);
addListener(SWT.Move, typedListener);
}
/**
* Adds the listener to the collection of listeners who will be notified
* when keys are pressed and released on the system keyboard, by sending it
* one of the messages defined in the <code>KeyListener</code> interface.
*
* @param listener
* the listener which should be notified
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
* </ul>
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*
* @see KeyListener
* @see #removeKeyListener
*/
public void addKeyListener(KeyListener listener) {
checkWidget();
if (listener == null)
error(SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener(listener);
addListener(SWT.KeyUp, typedListener);
addListener(SWT.KeyDown, typedListener);
}
/**
* Stops displaying the tracker rectangles. Note that this is not considered
* to be a cancelation by the user.
*
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*/
public void close() {
checkWidget();
tracking = false;
}
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;
}
Rectangle computeBounds() {
if (rectangles.length == 0)
return null;
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];
bounds = computeBounds();
if (bounds != null) {
for (int i = 0; i < rects.length; i++) {
int x = 0, y = 0, width = 0, height = 0;
if (bounds.width != 0) {
x = (rects[i].x - bounds.x) * 100 / bounds.width;
width = rects[i].width * 100 / bounds.width;
} else {
width = 100;
}
if (bounds.height != 0) {
y = (rects[i].y - bounds.y) * 100 / bounds.height;
height = rects[i].height * 100 / bounds.height;
} else {
height = 100;
}
result[i] = new Rectangle(x, y, width, height);
}
}
return result;
}
/**
* Returns the bounds that are being drawn, expressed relative to the parent
* widget. If the parent is a <code>Display</code> then these are screen
* coordinates.
*
* @return the bounds of the Rectangles being drawn
*
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*/
public Rectangle[] getRectangles() {
checkWidget();
Rectangle[] result = new Rectangle[rectangles.length];
for (int i = 0; i < rectangles.length; i++) {
Rectangle current = rectangles[i];
result[i] = new Rectangle(current.x, current.y, current.width,
current.height);
}
return result;
}
/**
* Returns <code>true</code> if the rectangles are drawn with a stippled
* line, <code>false</code> otherwise.
*
* @return the stippled effect of the rectangles
*
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*/
public boolean getStippled() {
checkWidget();
return stippled;
}
/**
* Displays the Tracker rectangles for manipulation by the user. Returns
* when the user has either finished manipulating the rectangles or has
* cancelled the Tracker.
*
* @return <code>true</code> if the user did not cancel the Tracker,
* <code>false</code> otherwise
*
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*/
public boolean open() {
return false;
}
void releaseWidget() {
super.releaseWidget();
parent = null;
rectangles = proportions = null;
bounds = null;
}
/**
* Removes the listener from the collection of listeners who will be
* notified when the control is moved or resized.
*
* @param listener
* the listener which should no longer be notified
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
* </ul>
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*
* @see ControlListener
* @see #addControlListener
*/
public void removeControlListener(ControlListener listener) {
checkWidget();
if (listener == null)
error(SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null)
return;
eventTable.unhook(SWT.Resize, listener);
eventTable.unhook(SWT.Move, listener);
}
/**
* Removes the listener from the collection of listeners who will be
* notified when keys are pressed and released on the system keyboard.
*
* @param listener
* the listener which should no longer be notified
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
* </ul>
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*
* @see KeyListener
* @see #addKeyListener
*/
public void removeKeyListener(KeyListener listener) {
checkWidget();
if (listener == null)
error(SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null)
return;
eventTable.unhook(SWT.KeyUp, listener);
eventTable.unhook(SWT.KeyDown, listener);
}
/**
* Sets the <code>Cursor</code> of the Tracker. If this cursor is
* <code>null</code> then the cursor reverts to the default.
*
* @param newCursor
* the new <code>Cursor</code> to display
*
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*/
public void setCursor(Cursor value) {
checkWidget();
cursor = value;
}
/**
* Specifies the rectangles that should be drawn, expressed relative to the
* parent widget. If the parent is a Display then these are screen
* coordinates.
*
* @param rectangles
* the bounds of the rectangles to be drawn
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if the set of rectangles is null
* or contains a null rectangle</li>
* </ul>
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*/
public void setRectangles(Rectangle[] rectangles) {
checkWidget();
if (rectangles == null)
error(SWT.ERROR_NULL_ARGUMENT);
int length = rectangles.length;
this.rectangles = new Rectangle[length];
for (int i = 0; i < length; i++) {
Rectangle current = rectangles[i];
if (current == null)
error(SWT.ERROR_NULL_ARGUMENT);
this.rectangles[i] = new Rectangle(current.x, current.y,
current.width, current.height);
}
proportions = computeProportions(rectangles);
}
/**
* Changes the appearance of the line used to draw the rectangles.
*
* @param stippled
* <code>true</code> if rectangle should appear stippled
*
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*/
public void setStippled(boolean stippled) {
checkWidget();
this.stippled = stippled;
}
}