/*******************************************************************************
* Copyright (c) 2000, 2013 IBM Corporation 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
*******************************************************************************/
package org.eclipse.swt.widgets;
import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
/**
* 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 {
Control parent;
boolean tracking, cancelled, stippled;
Rectangle [] rectangles = new Rectangle [0], proportions = rectangles;
Rectangle bounds;
long /*int*/ resizeCursor;
Cursor clientCursor;
int cursorOrientation = SWT.NONE;
boolean inEvent = false;
boolean drawn;
long /*int*/ hwndTransparent, hwndOpaque, oldTransparentProc, oldOpaqueProc;
int oldX, oldY;
static boolean IsVista = !OS.IsWinCE && OS.WIN32_VERSION >= OS.VERSION (6, 0);
/*
* The following values mirror step sizes on Windows
*/
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);
}
Point adjustMoveCursor () {
if (bounds == null) return null;
int newX = bounds.x + bounds.width / 2;
int newY = bounds.y;
POINT pt = new POINT ();
pt.x = newX; pt.y = newY;
/*
* Convert to screen coordinates iff needed
*/
if (parent != null) {
OS.ClientToScreen (parent.handle, pt);
}
OS.SetCursorPos (pt.x, pt.y);
return new Point (pt.x, pt.y);
}
Point adjustResizeCursor () {
if (bounds == null) return null;
int newX, newY;
if ((cursorOrientation & SWT.LEFT) != 0) {
newX = bounds.x;
} else if ((cursorOrientation & SWT.RIGHT) != 0) {
newX = bounds.x + bounds.width;
} else {
newX = bounds.x + bounds.width / 2;
}
if ((cursorOrientation & SWT.UP) != 0) {
newY = bounds.y;
} else if ((cursorOrientation & SWT.DOWN) != 0) {
newY = bounds.y + bounds.height;
} else {
newY = bounds.y + bounds.height / 2;
}
POINT pt = new POINT ();
pt.x = newX; pt.y = newY;
/*
* Convert to screen coordinates iff needed
*/
if (parent != null) {
OS.ClientToScreen (parent.handle, pt);
}
OS.SetCursorPos (pt.x, pt.y);
/*
* If the client has not provided a custom cursor then determine
* the appropriate resize cursor.
*/
if (clientCursor == null) {
long /*int*/ newCursor = 0;
switch (cursorOrientation) {
case SWT.UP:
newCursor = OS.LoadCursor (0, OS.IDC_SIZENS);
break;
case SWT.DOWN:
newCursor = OS.LoadCursor (0, OS.IDC_SIZENS);
break;
case SWT.LEFT:
newCursor = OS.LoadCursor (0, OS.IDC_SIZEWE);
break;
case SWT.RIGHT:
newCursor = OS.LoadCursor (0, OS.IDC_SIZEWE);
break;
case SWT.LEFT | SWT.UP:
newCursor = OS.LoadCursor (0, OS.IDC_SIZENWSE);
break;
case SWT.RIGHT | SWT.DOWN:
newCursor = OS.LoadCursor (0, OS.IDC_SIZENWSE);
break;
case SWT.LEFT | SWT.DOWN:
newCursor = OS.LoadCursor (0, OS.IDC_SIZENESW);
break;
case SWT.RIGHT | SWT.UP:
newCursor = OS.LoadCursor (0, OS.IDC_SIZENESW);
break;
default:
newCursor = OS.LoadCursor (0, OS.IDC_SIZEALL);
break;
}
OS.SetCursor (newCursor);
if (resizeCursor != 0) {
OS.DestroyCursor (resizeCursor);
}
resizeCursor = newCursor;
}
return new Point (pt.x, pt.y);
}
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;
}
/**
* 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;
}
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;
}
/**
* Draw the rectangles displayed by the tracker.
*/
void drawRectangles (Rectangle [] rects, boolean stippled) {
if (hwndOpaque != 0) {
RECT rect1 = new RECT();
int bandWidth = stippled ? 3 : 1;
for (int i = 0; i < rects.length; i++) {
Rectangle rect = rects[i];
rect1.left = rect.x - bandWidth;
rect1.top = rect.y - bandWidth;
rect1.right = rect.x + rect.width + bandWidth * 2;
rect1.bottom = rect.y + rect.height + bandWidth * 2;
OS.MapWindowPoints (0, hwndOpaque, rect1, 2);
OS.RedrawWindow (hwndOpaque, rect1, 0, OS.RDW_INVALIDATE);
}
return;
}
int bandWidth = 1;
long /*int*/ hwndTrack = parent == null ? OS.GetDesktopWindow () : parent.handle;
long /*int*/ hDC = OS.GetDCEx (hwndTrack, 0, OS.DCX_CACHE);
long /*int*/ hBitmap = 0, hBrush = 0, oldBrush = 0;
if (stippled) {
bandWidth = 3;
byte [] bits = {-86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0};
hBitmap = OS.CreateBitmap (8, 8, 1, 1, bits);
hBrush = OS.CreatePatternBrush (hBitmap);
oldBrush = OS.SelectObject (hDC, hBrush);
}
for (int i=0; i<rects.length; i++) {
Rectangle rect = rects [i];
OS.PatBlt (hDC, rect.x, rect.y, rect.width, bandWidth, OS.PATINVERT);
OS.PatBlt (hDC, rect.x, rect.y + bandWidth, bandWidth, rect.height - (bandWidth * 2), OS.PATINVERT);
OS.PatBlt (hDC, rect.x + rect.width - bandWidth, rect.y + bandWidth, bandWidth, rect.height - (bandWidth * 2), OS.PATINVERT);
OS.PatBlt (hDC, rect.x, rect.y + rect.height - bandWidth, rect.width, bandWidth, OS.PATINVERT);
}
if (stippled) {
OS.SelectObject (hDC, oldBrush);
OS.DeleteObject (hBrush);
OS.DeleteObject (hBitmap);
}
OS.ReleaseDC (hwndTrack, hDC);
}
/**
* 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;
}
void moveRectangles (int xChange, int yChange) {
if (bounds == null) return;
if (xChange < 0 && ((style & SWT.LEFT) == 0)) xChange = 0;
if (xChange > 0 && ((style & SWT.RIGHT) == 0)) xChange = 0;
if (yChange < 0 && ((style & SWT.UP) == 0)) yChange = 0;
if (yChange > 0 && ((style & SWT.DOWN) == 0)) yChange = 0;
if (xChange == 0 && yChange == 0) return;
bounds.x += xChange; bounds.y += yChange;
for (int i = 0; i < rectangles.length; i++) {
rectangles [i].x += xChange;
rectangles [i].y += yChange;
}
}
/**
* 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 () {
checkWidget ();
cancelled = false;
tracking = true;
/*
* If exactly one of UP/DOWN is specified as a style then set the cursor
* orientation accordingly (the same is done for LEFT/RIGHT styles below).
*/
int vStyle = style & (SWT.UP | SWT.DOWN);
if (vStyle == SWT.UP || vStyle == SWT.DOWN) {
cursorOrientation |= vStyle;
}
int hStyle = style & (SWT.LEFT | SWT.RIGHT);
if (hStyle == SWT.LEFT || hStyle == SWT.RIGHT) {
cursorOrientation |= hStyle;
}
Callback newProc = null;
boolean mouseDown = OS.GetKeyState(OS.VK_LBUTTON) < 0;
/*
* Bug in Vista. Drawing directly to the screen with XOR does not
* perform well. The fix is to draw on layered window instead.
*
* Note that one window (almost opaque) is used for catching all events and a
* second window is used for drawing the rectangles.
*/
if (IsVista && parent == null) {
Rectangle bounds = display.getBounds();
hwndTransparent = OS.CreateWindowEx (
OS.WS_EX_LAYERED | OS.WS_EX_NOACTIVATE | OS.WS_EX_TOOLWINDOW,
display.windowClass,
null,
OS.WS_POPUP,
bounds.x, bounds.y,
bounds.width, bounds.height,
0,
0,
OS.GetModuleHandle (null),
null);
OS.SetLayeredWindowAttributes (hwndTransparent, 0, (byte)0x01, OS.LWA_ALPHA);
hwndOpaque = OS.CreateWindowEx (
OS.WS_EX_LAYERED | OS.WS_EX_NOACTIVATE | OS.WS_EX_TOOLWINDOW,
display.windowClass,
null,
OS.WS_POPUP,
bounds.x, bounds.y,
bounds.width, bounds.height,
hwndTransparent,
0,
OS.GetModuleHandle (null),
null);
OS.SetLayeredWindowAttributes (hwndOpaque, 0xFFFFFF, (byte)0, OS.LWA_COLORKEY | OS.LWA_ALPHA);
drawn = false;
newProc = new Callback (this, "transparentProc", 4); //$NON-NLS-1$
long /*int*/ newProcAddress = newProc.getAddress ();
if (newProcAddress == 0) error (SWT.ERROR_NO_MORE_CALLBACKS);
oldTransparentProc = OS.GetWindowLongPtr (hwndTransparent, OS.GWLP_WNDPROC);
OS.SetWindowLongPtr (hwndTransparent, OS.GWLP_WNDPROC, newProcAddress);
oldOpaqueProc = OS.GetWindowLongPtr (hwndOpaque, OS.GWLP_WNDPROC);
OS.SetWindowLongPtr (hwndOpaque, OS.GWLP_WNDPROC, newProcAddress);
OS.ShowWindow (hwndTransparent, OS.SW_SHOWNOACTIVATE);
OS.ShowWindow (hwndOpaque, OS.SW_SHOWNOACTIVATE);
} else {
/*
* If this tracker is being created without a mouse drag then
* we need to create a transparent window that fills the screen
* in order to get all mouse/keyboard events that occur
* outside of our visible windows (ie.- over the desktop).
*/
if (!mouseDown) {
Rectangle bounds = display.getBounds();
hwndTransparent = OS.CreateWindowEx (
OS.WS_EX_TRANSPARENT,
display.windowClass,
null,
OS.WS_POPUP,
bounds.x, bounds.y,
bounds.width, bounds.height,
0,
0,
OS.GetModuleHandle (null),
null);
newProc = new Callback (this, "transparentProc", 4); //$NON-NLS-1$
long /*int*/ newProcAddress = newProc.getAddress ();
if (newProcAddress == 0) error (SWT.ERROR_NO_MORE_CALLBACKS);
oldTransparentProc = OS.GetWindowLongPtr (hwndTransparent, OS.GWLP_WNDPROC);
OS.SetWindowLongPtr (hwndTransparent, OS.GWLP_WNDPROC, newProcAddress);
OS.ShowWindow (hwndTransparent, OS.SW_SHOWNOACTIVATE);
}
}
update ();
drawRectangles (rectangles, stippled);
Point cursorPos = null;
if (mouseDown) {
POINT pt = new POINT ();
OS.GetCursorPos (pt);
cursorPos = new Point (pt.x, pt.y);
} else {
if ((style & SWT.RESIZE) != 0) {
cursorPos = adjustResizeCursor ();
} else {
cursorPos = adjustMoveCursor ();
}
}
if (cursorPos != null) {
oldX = cursorPos.x;
oldY = cursorPos.y;
}
Display display = this.display;
try {
/* Tracker behaves like a Dialog with its own OS event loop. */
MSG msg = new MSG ();
while (tracking && !cancelled) {
if (parent != null && parent.isDisposed ()) break;
display.runSkin ();
display.runDeferredLayouts ();
OS.GetMessage (msg, 0, 0, 0);
OS.TranslateMessage (msg);
switch (msg.message) {
case OS.WM_LBUTTONUP:
case OS.WM_MOUSEMOVE:
wmMouse (msg.message, msg.wParam, msg.lParam);
break;
case OS.WM_IME_CHAR: wmIMEChar (msg.hwnd, msg.wParam, msg.lParam); break;
case OS.WM_CHAR: wmChar (msg.hwnd, msg.wParam, msg.lParam); break;
case OS.WM_KEYDOWN: wmKeyDown (msg.hwnd, msg.wParam, msg.lParam); break;
case OS.WM_KEYUP: wmKeyUp (msg.hwnd, msg.wParam, msg.lParam); break;
case OS.WM_SYSCHAR: wmSysChar (msg.hwnd, msg.wParam, msg.lParam); break;
case OS.WM_SYSKEYDOWN: wmSysKeyDown (msg.hwnd, msg.wParam, msg.lParam); break;
case OS.WM_SYSKEYUP: wmSysKeyUp (msg.hwnd, msg.wParam, msg.lParam); break;
}
if (OS.WM_KEYFIRST <= msg.message && msg.message <= OS.WM_KEYLAST) continue;
if (OS.WM_MOUSEFIRST <= msg.message && msg.message <= OS.WM_MOUSELAST) continue;
if (hwndOpaque == 0) {
if (msg.message == OS.WM_PAINT) {
update ();
drawRectangles (rectangles, stippled);
}
}
OS.DispatchMessage (msg);
if (hwndOpaque == 0) {
if (msg.message == OS.WM_PAINT) {
drawRectangles (rectangles, stippled);
}
}
display.runAsyncMessages (false);
}
if (mouseDown) OS.ReleaseCapture ();
if (!isDisposed()) {
update ();
drawRectangles (rectangles, stippled);
}
} finally {
/*
* Cleanup: If a transparent window was created in order to capture events then
* destroy it and its callback object now.
*/
if (hwndTransparent != 0) {
OS.DestroyWindow (hwndTransparent);
hwndTransparent = 0;
}
hwndOpaque = 0;
if (newProc != null) {
newProc.dispose ();
oldTransparentProc = oldOpaqueProc = 0;
}
/*
* Cleanup: If this tracker was resizing then the last cursor that it created
* needs to be destroyed.
*/
if (resizeCursor != 0) {
OS.DestroyCursor (resizeCursor);
resizeCursor = 0;
}
}
tracking = false;
return !cancelled;
}
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);
}
void resizeRectangles (int xChange, int yChange) {
if (bounds == null) return;
/*
* 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;
}
if (xChange > 0 && ((style & SWT.RIGHT) != 0) && ((cursorOrientation & SWT.LEFT) == 0)) {
cursorOrientation |= SWT.RIGHT;
}
if (yChange < 0 && ((style & SWT.UP) != 0) && ((cursorOrientation & SWT.DOWN) == 0)) {
cursorOrientation |= SWT.UP;
}
if (yChange > 0 && ((style & SWT.DOWN) != 0) && ((cursorOrientation & SWT.UP) == 0)) {
cursorOrientation |= SWT.DOWN;
}
/*
* If the bounds will flip about the x or y axis then apply the adjustment
* up to the axis (ie.- where bounds width/height becomes 0), change the
* cursor's orientation accordingly, and flip each Rectangle's origin (only
* necessary for > 1 Rectangles)
*/
if ((cursorOrientation & SWT.LEFT) != 0) {
if (xChange > bounds.width) {
if ((style & SWT.RIGHT) == 0) return;
cursorOrientation |= SWT.RIGHT;
cursorOrientation &= ~SWT.LEFT;
bounds.x += bounds.width;
xChange -= bounds.width;
bounds.width = 0;
if (proportions.length > 1) {
for (int i = 0; i < proportions.length; i++) {
Rectangle proportion = proportions [i];
proportion.x = 100 - proportion.x - proportion.width;
}
}
}
} else if ((cursorOrientation & SWT.RIGHT) != 0) {
if (bounds.width < -xChange) {
if ((style & SWT.LEFT) == 0) return;
cursorOrientation |= SWT.LEFT;
cursorOrientation &= ~SWT.RIGHT;
xChange += bounds.width;
bounds.width = 0;
if (proportions.length > 1) {
for (int i = 0; i < proportions.length; i++) {
Rectangle proportion = proportions [i];
proportion.x = 100 - proportion.x - proportion.width;
}
}
}
}
if ((cursorOrientation & SWT.UP) != 0) {
if (yChange > bounds.height) {
if ((style & SWT.DOWN) == 0) return;
cursorOrientation |= SWT.DOWN;
cursorOrientation &= ~SWT.UP;
bounds.y += bounds.height;
yChange -= bounds.height;
bounds.height = 0;
if (proportions.length > 1) {
for (int i = 0; i < proportions.length; i++) {
Rectangle proportion = proportions [i];
proportion.y = 100 - proportion.y - proportion.height;
}
}
}
} else if ((cursorOrientation & SWT.DOWN) != 0) {
if (bounds.height < -yChange) {
if ((style & SWT.UP) == 0) return;
cursorOrientation |= SWT.UP;
cursorOrientation &= ~SWT.DOWN;
yChange += bounds.height;
bounds.height = 0;
if (proportions.length > 1) {
for (int i = 0; i < proportions.length; i++) {
Rectangle proportion = proportions [i];
proportion.y = 100 - proportion.y - proportion.height;
}
}
}
}
// apply the bounds adjustment
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;
}
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;
}
/**
* 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 newCursor) {
checkWidget();
clientCursor = newCursor;
if (newCursor != null) {
if (inEvent) OS.SetCursor (clientCursor.handle);
}
}
/**
* 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);
this.rectangles = new Rectangle [rectangles.length];
for (int i = 0; i < rectangles.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;
}
long /*int*/ transparentProc (long /*int*/ hwnd, long /*int*/ msg, long /*int*/ wParam, long /*int*/ lParam) {
switch ((int)/*64*/msg) {
/*
* We typically do not want to answer that the transparent window is
* transparent to hits since doing so negates the effect of having it
* to grab events. However, clients of the tracker should not be aware
* of this transparent window. Therefore if there is a hit query
* performed as a result of client code then answer that the transparent
* window is transparent to hits so that its existence will not impact
* the client.
*/
case OS.WM_NCHITTEST:
if (inEvent) return OS.HTTRANSPARENT;
break;
case OS.WM_SETCURSOR:
if (clientCursor != null) {
OS.SetCursor (clientCursor.handle);
return 1;
}
if (resizeCursor != 0) {
OS.SetCursor (resizeCursor);
return 1;
}
break;
case OS.WM_PAINT:
if (hwndOpaque == hwnd) {
PAINTSTRUCT ps = new PAINTSTRUCT();
long /*int*/ hDC = OS.BeginPaint (hwnd, ps);
long /*int*/ hBitmap = 0, hBrush = 0, oldBrush = 0;
long /*int*/ transparentBrush = OS.CreateSolidBrush(0xFFFFFF);
oldBrush = OS.SelectObject (hDC, transparentBrush);
OS.PatBlt (hDC, ps.left, ps.top, ps.right - ps.left, ps.bottom - ps.top, OS.PATCOPY);
OS.SelectObject (hDC, oldBrush);
OS.DeleteObject (transparentBrush);
int bandWidth = 1;
if (stippled) {
bandWidth = 3;
byte [] bits = {-86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0, -86, 0, 85, 0};
hBitmap = OS.CreateBitmap (8, 8, 1, 1, bits);
hBrush = OS.CreatePatternBrush (hBitmap);
oldBrush = OS.SelectObject (hDC, hBrush);
OS.SetBkColor (hDC, 0xF0F0F0);
} else {
oldBrush = OS.SelectObject (hDC, OS.GetStockObject(OS.BLACK_BRUSH));
}
Rectangle[] rects = this.rectangles;
RECT rect1 = new RECT ();
for (int i=0; i<rects.length; i++) {
Rectangle rect = rects [i];
rect1.left = rect.x;
rect1.top = rect.y;
rect1.right = rect.x + rect.width;
rect1.bottom = rect.y + rect.height;
OS.MapWindowPoints (0, hwndOpaque, rect1, 2);
int width = rect1.right - rect1.left;
int height = rect1.bottom - rect1.top;
OS.PatBlt (hDC, rect1.left, rect1.top, width, bandWidth, OS.PATCOPY);
OS.PatBlt (hDC, rect1.left, rect1.top + bandWidth, bandWidth, height - (bandWidth * 2), OS.PATCOPY);
OS.PatBlt (hDC, rect1.right - bandWidth, rect1.top + bandWidth, bandWidth, height - (bandWidth * 2), OS.PATCOPY);
OS.PatBlt (hDC, rect1.left, rect1.bottom - bandWidth, width, bandWidth, OS.PATCOPY);
}
OS.SelectObject (hDC, oldBrush);
if (stippled) {
OS.DeleteObject (hBrush);
OS.DeleteObject (hBitmap);
}
OS.EndPaint (hwnd, ps);
if (!drawn) {
OS.SetLayeredWindowAttributes (hwndOpaque, 0xFFFFFF, (byte)0xFF, OS.LWA_COLORKEY | OS.LWA_ALPHA);
drawn = true;
}
return 0;
}
}
return OS.CallWindowProc (hwnd == hwndTransparent ? oldTransparentProc : oldOpaqueProc, hwnd, (int)/*64*/msg, wParam, lParam);
}
void update () {
if (hwndOpaque != 0) return;
if (parent != null) {
if (parent.isDisposed ()) return;
Shell shell = parent.getShell ();
shell.update (true);
} else {
display.update ();
}
}
LRESULT wmKeyDown (long /*int*/ hwnd, long /*int*/ wParam, long /*int*/ lParam) {
LRESULT result = super.wmKeyDown (hwnd, wParam, lParam);
if (result != null) return result;
boolean isMirrored = parent != null && (parent.style & SWT.MIRRORED) != 0;
int stepSize = OS.GetKeyState (OS.VK_CONTROL) < 0 ? STEPSIZE_SMALL : STEPSIZE_LARGE;
int xChange = 0, yChange = 0;
switch ((int)/*64*/wParam) {
case OS.VK_ESCAPE:
cancelled = true;
tracking = false;
break;
case OS.VK_RETURN:
tracking = false;
break;
case OS.VK_LEFT:
xChange = isMirrored ? stepSize : -stepSize;
break;
case OS.VK_RIGHT:
xChange = isMirrored ? -stepSize : stepSize;
break;
case OS.VK_UP:
yChange = -stepSize;
break;
case OS.VK_DOWN:
yChange = stepSize;
break;
}
if (xChange != 0 || yChange != 0) {
Rectangle [] oldRectangles = rectangles;
boolean oldStippled = stippled;
Rectangle [] rectsToErase = new Rectangle [rectangles.length];
for (int i = 0; i < rectangles.length; i++) {
Rectangle current = rectangles [i];
rectsToErase [i] = new Rectangle (current.x, current.y, current.width, current.height);
}
Event event = new Event ();
event.x = oldX + xChange;
event.y = oldY + yChange;
Point cursorPos;
if ((style & SWT.RESIZE) != 0) {
resizeRectangles (xChange, yChange);
inEvent = true;
sendEvent (SWT.Resize, event);
inEvent = false;
/*
* It is possible (but unlikely) that application
* code could have disposed the widget in the resize
* event. If this happens return false to indicate
* that the tracking has failed.
*/
if (isDisposed ()) {
cancelled = true;
return LRESULT.ONE;
}
boolean draw = false;
/*
* It is possible that application code could have
* changed the rectangles in the resize event. If this
* happens then only redraw the tracker if the rectangle
* values have changed.
*/
if (rectangles != oldRectangles) {
int length = rectangles.length;
if (length != rectsToErase.length) {
draw = true;
} else {
for (int i = 0; i < length; i++) {
if (!rectangles [i].equals (rectsToErase [i])) {
draw = true;
break;
}
}
}
} else {
draw = true;
}
if (draw) {
drawRectangles (rectsToErase, oldStippled);
update ();
drawRectangles (rectangles, stippled);
}
cursorPos = adjustResizeCursor ();
} else {
moveRectangles (xChange, yChange);
inEvent = true;
sendEvent (SWT.Move, event);
inEvent = false;
/*
* It is possible (but unlikely) that application
* code could have disposed the widget in the move
* event. If this happens return false to indicate
* that the tracking has failed.
*/
if (isDisposed ()) {
cancelled = true;
return LRESULT.ONE;
}
boolean draw = false;
/*
* It is possible that application code could have
* changed the rectangles in the move event. If this
* happens then only redraw the tracker if the rectangle
* values have changed.
*/
if (rectangles != oldRectangles) {
int length = rectangles.length;
if (length != rectsToErase.length) {
draw = true;
} else {
for (int i = 0; i < length; i++) {
if (!rectangles [i].equals (rectsToErase [i])) {
draw = true;
break;
}
}
}
} else {
draw = true;
}
if (draw) {
drawRectangles (rectsToErase, oldStippled);
update ();
drawRectangles (rectangles, stippled);
}
cursorPos = adjustMoveCursor ();
}
if (cursorPos != null) {
oldX = cursorPos.x;
oldY = cursorPos.y;
}
}
return result;
}
LRESULT wmSysKeyDown (long /*int*/ hwnd, long /*int*/ wParam, long /*int*/ lParam) {
LRESULT result = super.wmSysKeyDown (hwnd, wParam, lParam);
if (result != null) return result;
cancelled = true;
tracking = false;
return result;
}
LRESULT wmMouse (int message, long /*int*/ wParam, long /*int*/ lParam) {
boolean isMirrored = parent != null && (parent.style & SWT.MIRRORED) != 0;
int newPos = OS.GetMessagePos ();
int newX = OS.GET_X_LPARAM (newPos);
int newY = OS.GET_Y_LPARAM (newPos);
if (newX != oldX || newY != oldY) {
Rectangle [] oldRectangles = rectangles;
boolean oldStippled = stippled;
Rectangle [] rectsToErase = new Rectangle [rectangles.length];
for (int i = 0; i < rectangles.length; i++) {
Rectangle current = rectangles [i];
rectsToErase [i] = new Rectangle (current.x, current.y, current.width, current.height);
}
Event event = new Event ();
event.x = newX;
event.y = newY;
if ((style & SWT.RESIZE) != 0) {
if (isMirrored) {
resizeRectangles (oldX - newX, newY - oldY);
} else {
resizeRectangles (newX - oldX, newY - oldY);
}
inEvent = true;
sendEvent (SWT.Resize, event);
inEvent = false;
/*
* It is possible (but unlikely), that application
* code could have disposed the widget in the resize
* event. If this happens, return false to indicate
* that the tracking has failed.
*/
if (isDisposed ()) {
cancelled = true;
return LRESULT.ONE;
}
boolean draw = false;
/*
* It is possible that application code could have
* changed the rectangles in the resize event. If this
* happens then only redraw the tracker if the rectangle
* values have changed.
*/
if (rectangles != oldRectangles) {
int length = rectangles.length;
if (length != rectsToErase.length) {
draw = true;
} else {
for (int i = 0; i < length; i++) {
if (!rectangles [i].equals (rectsToErase [i])) {
draw = true;
break;
}
}
}
}
else {
draw = true;
}
if (draw) {
drawRectangles (rectsToErase, oldStippled);
update ();
drawRectangles (rectangles, stippled);
}
Point cursorPos = adjustResizeCursor ();
if (cursorPos != null) {
newX = cursorPos.x;
newY = cursorPos.y;
}
} else {
if (isMirrored) {
moveRectangles (oldX - newX, newY - oldY);
} else {
moveRectangles (newX - oldX, newY - oldY);
}
inEvent = true;
sendEvent (SWT.Move, event);
inEvent = false;
/*
* It is possible (but unlikely), that application
* code could have disposed the widget in the move
* event. If this happens, return false to indicate
* that the tracking has failed.
*/
if (isDisposed ()) {
cancelled = true;
return LRESULT.ONE;
}
boolean draw = false;
/*
* It is possible that application code could have
* changed the rectangles in the move event. If this
* happens then only redraw the tracker if the rectangle
* values have changed.
*/
if (rectangles != oldRectangles) {
int length = rectangles.length;
if (length != rectsToErase.length) {
draw = true;
} else {
for (int i = 0; i < length; i++) {
if (!rectangles [i].equals (rectsToErase [i])) {
draw = true;
break;
}
}
}
} else {
draw = true;
}
if (draw) {
drawRectangles (rectsToErase, oldStippled);
update ();
drawRectangles (rectangles, stippled);
}
}
oldX = newX;
oldY = newY;
}
tracking = message != OS.WM_LBUTTONUP;
return null;
}
}