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|
/*******************************************************************************
* Copyright (c) 2000, 2009 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.motif.*;
import org.eclipse.swt.*;
import org.eclipse.swt.events.*;
/**
* This class is the abstract superclass of all user interface objects.
* Widgets are created, disposed and issue notification to listeners
* when events occur which affect them.
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>(none)</dd>
* <dt><b>Events:</b></dt>
* <dd>Dispose</dd>
* </dl>
* <p>
* IMPORTANT: This class is intended to be subclassed <em>only</em>
* within the SWT implementation. However, it has not been marked
* final to allow those outside of the SWT development team to implement
* patched versions of the class in order to get around specific
* limitations in advance of when those limitations can be addressed
* by the team. Any class built using subclassing to access the internals
* of this class will likely fail to compile or run between releases and
* may be strongly platform specific. Subclassing should not be attempted
* without an intimate and detailed understanding of the workings of the
* hierarchy. No support is provided for user-written classes which are
* implemented as subclasses of this class.
* </p>
*
* @see #checkSubclass
* @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
*/
public abstract class Widget {
/**
* the handle to the OS resource
* (Warning: This field is platform dependent)
* <p>
* <b>IMPORTANT:</b> This field is <em>not</em> part of the SWT
* public API. It is marked public only so that it can be shared
* within the packages provided by SWT. It is not available on all
* platforms and should never be accessed from application code.
* </p>
*
* @noreference This field is not intended to be referenced by clients.
*/
public int handle;
int style, state;
Display display;
EventTable eventTable;
Object data;
/* Global state flags */
static final int DISPOSED = 1<<0;
static final int CANVAS = 1<<1;
static final int KEYED_DATA = 1<<2;
static final int FOCUS_FORCED = 1<<3;
static final int BACKGROUND = 1<<4;
static final int FOREGROUND = 1<<5;
static final int PARENT_BACKGROUND = 1<<6;
static final int THEME_BACKGROUND = 1<<7;
/* A layout was requested on this widget */
static final int LAYOUT_NEEDED = 1<<8;
/* The preferred size of a child has changed */
static final int LAYOUT_CHANGED = 1<<9;
/* A layout was requested in this widget hierachy */
static final int LAYOUT_CHILD = 1<<10;
/* More global state flags */
static final int RELEASED = 1<<11;
static final int DISPOSE_SENT = 1<<12;
static final int FOREIGN_HANDLE = 1<<13;
static final int DRAG_DETECT = 1<<14;
/* Notify of the opportunity to skin this widget */
static final int SKIN_NEEDED = 1<<15;
/* Default size for widgets */
static final int DEFAULT_WIDTH = 64;
static final int DEFAULT_HEIGHT = 64;
/* Events and Callback constants */
static final int BUTTON_PRESS = 1;
static final int BUTTON_RELEASE = 2;
static final int EXPOSURE = 3;
static final int ENTER_WINDOW = 4;
static final int FOCUS_CHANGE = 5;
static final int KEY_PRESS = 6;
static final int KEY_RELEASE = 7;
static final int LEAVE_WINDOW = 8;
static final int ACTIVATE_CALLBACK = 9;
static final int ARM_CALLBACK = 10;
static final int BROWSE_SELECTION_CALLBACK = 11;
static final int CASCADING_CALLBACK = 12;
static final int DECREMENT_CALLBACK = 13;
static final int DEFAULT_ACTION_CALLBACK = 14;
static final int DRAG_CALLBACK = 15;
static final int EXTENDED_SELECTION_CALLBACK = 16;
static final int HELP_CALLBACK = 17;
static final int INCREMENT_CALLBACK = 18;
static final int MODIFY_VERIFY_CALLBACK = 19;
static final int PAGE_DECREMENT_CALLBACK = 20;
static final int PAGE_INCREMENT_CALLBACK = 21;
static final int TO_BOTTOM_CALLBACK = 22;
static final int TO_TOP_CALLBACK = 23;
static final int VALUE_CHANGED_CALLBACK = 24;
static final int NON_MASKABLE = 25;
static final int POINTER_MOTION = 26;
static final int STRUCTURE_NOTIFY = 27;
static final int MAP_CALLBACK = 28;
static final int UNMAP_CALLBACK = 29;
static final int DELETE_WINDOW = 30;
static final int EXPOSURE_CALLBACK = 31;
static final int MULTIPLE_SELECTION_CALLBACK = 32;
static final int PROPERTY_CHANGE = 33;
Widget () {
/* Do nothing */
}
/**
* 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>
* <li>ERROR_INVALID_ARGUMENT - if the parent is disposed</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
* @see #checkSubclass
* @see #getStyle
*/
public Widget (Widget parent, int style) {
checkSubclass ();
checkParent (parent);
this.style = style;
display = parent.display;
reskinWidget ();
}
/**
* Adds the listener to the collection of listeners who will
* be notified when an event of the given type occurs. When the
* event does occur in the widget, the listener is notified by
* sending it the <code>handleEvent()</code> message. The event
* type is one of the event constants defined in class <code>SWT</code>.
*
* @param eventType the type of event to listen for
* @param listener the listener which should be notified when the event occurs
*
* @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 Listener
* @see SWT
* @see #getListeners(int)
* @see #removeListener(int, Listener)
* @see #notifyListeners
*/
public void addListener (int eventType, Listener handler) {
checkWidget();
if (handler == null) error (SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null) eventTable = new EventTable ();
eventTable.hook (eventType, handler);
}
/**
* Adds the listener to the collection of listeners who will
* be notified when the widget is disposed. When the widget is
* disposed, the listener is notified by sending it the
* <code>widgetDisposed()</code> message.
*
* @param listener the listener which should be notified when the receiver is disposed
*
* @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 DisposeListener
* @see #removeDisposeListener
*/
public void addDisposeListener (DisposeListener listener) {
checkWidget();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
TypedListener typedListener = new TypedListener (listener);
addListener (SWT.Dispose, typedListener);
}
static int checkBits (int style, int int0, int int1, int int2, int int3, int int4, int int5) {
int mask = int0 | int1 | int2 | int3 | int4 | int5;
if ((style & mask) == 0) style |= int0;
if ((style & int0) != 0) style = (style & ~mask) | int0;
if ((style & int1) != 0) style = (style & ~mask) | int1;
if ((style & int2) != 0) style = (style & ~mask) | int2;
if ((style & int3) != 0) style = (style & ~mask) | int3;
if ((style & int4) != 0) style = (style & ~mask) | int4;
if ((style & int5) != 0) style = (style & ~mask) | int5;
return style;
}
void checkOpen () {
/* Do nothing */
}
void checkOrientation (Widget parent) {
style &= ~SWT.MIRRORED;
if ((style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT)) == 0) {
if (parent != null) {
if ((parent.style & SWT.LEFT_TO_RIGHT) != 0) style |= SWT.LEFT_TO_RIGHT;
if ((parent.style & SWT.RIGHT_TO_LEFT) != 0) style |= SWT.RIGHT_TO_LEFT;
}
}
style = checkBits (style, SWT.LEFT_TO_RIGHT, SWT.RIGHT_TO_LEFT, 0, 0, 0, 0);
}
void checkParent (Widget parent) {
if (parent == null) error (SWT.ERROR_NULL_ARGUMENT);
if (parent.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
parent.checkWidget ();
parent.checkOpen ();
}
/**
* Checks that this class can be subclassed.
* <p>
* The SWT class library is intended to be subclassed
* only at specific, controlled points (most notably,
* <code>Composite</code> and <code>Canvas</code> when
* implementing new widgets). This method enforces this
* rule unless it is overridden.
* </p><p>
* <em>IMPORTANT:</em> By providing an implementation of this
* method that allows a subclass of a class which does not
* normally allow subclassing to be created, the implementer
* agrees to be fully responsible for the fact that any such
* subclass will likely fail between SWT releases and will be
* strongly platform specific. No support is provided for
* user-written classes which are implemented in this fashion.
* </p><p>
* The ability to subclass outside of the allowed SWT classes
* is intended purely to enable those not on the SWT development
* team to implement patches in order to get around specific
* limitations in advance of when those limitations can be
* addressed by the team. Subclassing should not be attempted
* without an intimate and detailed understanding of the hierarchy.
* </p>
*
* @exception SWTException <ul>
* <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
* </ul>
*/
protected void checkSubclass () {
if (!isValidSubclass ()) error (SWT.ERROR_INVALID_SUBCLASS);
}
/**
* Throws an <code>SWTException</code> if the receiver can not
* be accessed by the caller. This may include both checks on
* the state of the receiver and more generally on the entire
* execution context. This method <em>should</em> be called by
* widget implementors to enforce the standard SWT invariants.
* <p>
* Currently, it is an error to invoke any method (other than
* <code>isDisposed()</code>) on a widget that has had its
* <code>dispose()</code> method called. It is also an error
* to call widget methods from any thread that is different
* from the thread that created the widget.
* </p><p>
* In future releases of SWT, there may be more or fewer error
* checks and exceptions may be thrown for different reasons.
* </p>
*
* @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>
*/
protected void checkWidget () {
Display display = this.display;
if (display == null) error (SWT.ERROR_WIDGET_DISPOSED);
if (display.thread != Thread.currentThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
if ((state & DISPOSED) != 0) error (SWT.ERROR_WIDGET_DISPOSED);
}
void createHandle (int index) {
/* Do nothing */
}
void createWidget (int index) {
createHandle (index);
hookEvents ();
register ();
manageChildren ();
}
void deregister () {
if (handle == 0) return;
display.removeWidget (handle);
}
void destroyWidget () {
int topHandle = topHandle ();
releaseHandle ();
if (topHandle != 0) {
OS.XtDestroyWidget (topHandle);
}
}
/**
* Disposes of the operating system resources associated with
* the receiver and all its descendants. After this method has
* been invoked, the receiver and all descendants will answer
* <code>true</code> when sent the message <code>isDisposed()</code>.
* Any internal connections between the widgets in the tree will
* have been removed to facilitate garbage collection.
* This method does nothing if the widget is already disposed.
* <p>
* NOTE: This method is not called recursively on the descendants
* of the receiver. This means that, widget implementers can not
* detect when a widget is being disposed of by re-implementing
* this method, but should instead listen for the <code>Dispose</code>
* event.
* </p>
*
* @exception SWTException <ul>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
* </ul>
*
* @see #addDisposeListener
* @see #removeDisposeListener
* @see #checkWidget
*/
public void dispose () {
/*
* Note: It is valid to attempt to dispose a widget
* more than once. If this happens, fail silently.
*/
if (isDisposed ()) return;
if (!isValidThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
release (true);
}
void enableHandle (boolean enabled, int widgetHandle) {
int [] argList = {OS.XmNsensitive, enabled ? 1 : 0};
OS.XtSetValues (widgetHandle, argList, argList.length / 2);
}
void error (int code) {
SWT.error(code);
}
boolean filters (int eventType) {
return display.filters (eventType);
}
static char fixMnemonic (char [] buffer) {
int i=0, j=0;
char mnemonic=0;
while (i < buffer.length) {
if ((buffer [j++] = buffer [i++]) == '&') {
if (i == buffer.length) {continue;}
if (buffer [i] == '&') {i++; continue;}
if (mnemonic == 0) mnemonic = buffer [i];
j--;
}
}
while (j < buffer.length) buffer [j++] = 0;
return mnemonic;
}
int focusProc (int w, int client_data, int call_data, int continue_to_dispatch) {
return 0;
}
String getCodePage () {
return null;
}
/**
* Returns the application defined widget data associated
* with the receiver, or null if it has not been set. The
* <em>widget data</em> is a single, unnamed field that is
* stored with every widget.
* <p>
* Applications may put arbitrary objects in this field. If
* the object stored in the widget data needs to be notified
* when the widget is disposed of, it is the application's
* responsibility to hook the Dispose event on the widget and
* do so.
* </p>
*
* @return the widget data
*
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - when the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - when called from the wrong thread</li>
* </ul>
*
* @see #setData(Object)
*/
public Object getData () {
checkWidget();
return (state & KEYED_DATA) != 0 ? ((Object []) data) [0] : data;
}
/**
* Returns the application defined property of the receiver
* with the specified name, or null if it has not been set.
* <p>
* Applications may have associated arbitrary objects with the
* receiver in this fashion. If the objects stored in the
* properties need to be notified when the widget is disposed
* of, it is the application's responsibility to hook the
* Dispose event on the widget and do so.
* </p>
*
* @param key the name of the property
* @return the value of the property or null if it has not been set
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the key 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 #setData(String, Object)
*/
public Object getData (String key) {
checkWidget();
if (key == null) error (SWT.ERROR_NULL_ARGUMENT);
if ((state & KEYED_DATA) != 0) {
Object [] table = (Object []) data;
for (int i=1; i<table.length; i+=2) {
if (key.equals (table [i])) return table [i+1];
}
}
return null;
}
/**
* Returns the <code>Display</code> that is associated with
* the receiver.
* <p>
* A widget's display is either provided when it is created
* (for example, top level <code>Shell</code>s) or is the
* same as its parent's display.
* </p>
*
* @return the receiver's display
*
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been disposed</li>
* </ul>
*/
public Display getDisplay () {
Display display = this.display;
if (display == null) error (SWT.ERROR_WIDGET_DISPOSED);
return display;
}
/**
* Returns an array of listeners who will be notified when an event
* of the given type occurs. The event type is one of the event constants
* defined in class <code>SWT</code>.
*
* @param eventType the type of event to listen for
* @return an array of listeners that will be notified when the event occurs
*
* @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 Listener
* @see SWT
* @see #addListener(int, Listener)
* @see #removeListener(int, Listener)
* @see #notifyListeners
*
* @since 3.4
*/
public Listener[] getListeners (int eventType) {
checkWidget();
if (eventTable == null) return new Listener[0];
return eventTable.getListeners(eventType);
}
String getName () {
String string = getClass ().getName ();
int index = string.lastIndexOf ('.');
if (index == -1) return string;
return string.substring (index + 1, string.length ());
}
String getNameText () {
return "";
}
/**
* Returns the receiver's style information.
* <p>
* Note that the value which is returned by this method <em>may
* not match</em> the value which was provided to the constructor
* when the receiver was created. This can occur when the underlying
* operating system does not support a particular combination of
* requested styles. For example, if the platform widget used to
* implement a particular SWT widget always has scroll bars, the
* result of calling this method would always have the
* <code>SWT.H_SCROLL</code> and <code>SWT.V_SCROLL</code> bits set.
* </p>
*
* @return the style bits
*
* @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 int getStyle () {
checkWidget();
return style;
}
void hookEvents () {
/* Do nothing */
}
boolean hooks (int eventType) {
if (eventTable == null) return false;
return eventTable.hooks (eventType);
}
/**
* Returns <code>true</code> if the widget has been disposed,
* and <code>false</code> otherwise.
* <p>
* This method gets the dispose state for the widget.
* When a widget has been disposed, it is an error to
* invoke any other method (except {@link #dispose()}) using the widget.
* </p>
*
* @return <code>true</code> when the widget is disposed and <code>false</code> otherwise
*/
public boolean isDisposed () {
return (state & DISPOSED) != 0;
}
/**
* Returns <code>true</code> if there are any listeners
* for the specified event type associated with the receiver,
* and <code>false</code> otherwise. The event type is one of
* the event constants defined in class <code>SWT</code>.
*
* @param eventType the type of event
* @return true if the event is hooked
*
* @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 SWT
*/
public boolean isListening (int eventType) {
checkWidget();
return hooks (eventType);
}
boolean isValidSubclass () {
return Display.isValidClass (getClass ());
}
boolean isValidThread () {
return getDisplay ().isValidThread ();
}
void manageChildren () {
/* Do nothing */
}
/**
* Notifies all of the receiver's listeners for events
* of the given type that one such event has occurred by
* invoking their <code>handleEvent()</code> method. The
* event type is one of the event constants defined in class
* <code>SWT</code>.
*
* @param eventType the type of event which has occurred
* @param event the event data
*
* @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 SWT
* @see #addListener
* @see #getListeners(int)
* @see #removeListener(int, Listener)
*/
public void notifyListeners (int eventType, Event event) {
checkWidget();
if (event == null) event = new Event ();
sendEvent (eventType, event);
}
void postEvent (int eventType) {
sendEvent (eventType, null, false);
}
void postEvent (int eventType, Event event) {
sendEvent (eventType, event, false);
}
void propagateHandle (boolean enabled, int widgetHandle, int cursor) {
int xDisplay = OS.XtDisplay (widgetHandle);
if (xDisplay == 0) return;
int xWindow = OS.XtWindow (widgetHandle);
if (xWindow == 0) return;
/*
* Get the event mask from the widget. The event mask
* returned by XtBuildEventMask () includes the masks
* associated with all callbacks and event handlers
* that have been hooked on the widget.
*/
int event_mask = OS.XtBuildEventMask (widgetHandle);
int do_not_propagate_mask =
OS.KeyPressMask | OS.KeyReleaseMask | OS.ButtonPressMask |
OS.ButtonReleaseMask | OS.PointerMotionMask;
if (!enabled) {
/*
* Attempting to propogate EnterWindowMask and LeaveWindowMask
* causes an X error so these must be specially cleared out from
* the event mask, not included in the propogate mask.
*/
event_mask &= ~(do_not_propagate_mask | OS.EnterWindowMask | OS.LeaveWindowMask);
do_not_propagate_mask = 0;
}
int mask = OS.CWDontPropagate | OS.CWEventMask | OS.CWCursor;
XSetWindowAttributes attributes = new XSetWindowAttributes ();
attributes.event_mask = event_mask;
attributes.do_not_propagate_mask = do_not_propagate_mask;
attributes.cursor = cursor;
OS.XChangeWindowAttributes (xDisplay, xWindow, mask, attributes);
}
void redrawHandle (int x, int y, int width, int height, boolean redrawAll, int widgetHandle) {
int display = OS.XtDisplay (widgetHandle);
if (display == 0) return;
int window = OS.XtWindow (widgetHandle);
if (window == 0) return;
if (redrawAll) {
OS.XClearArea (display, window, 0, 0, 0, 0, true);
} else {
if (width > 0 && height > 0) {
int [] argList = {
OS.XmNwidth, 0, /* 1 */
OS.XmNheight, 0, /* 3 */
};
OS.XtGetValues (widgetHandle, argList, argList.length / 2);
if ((x < argList [1]) && (y < argList [3]) && (x + width > 0) && (y + height > 0)) {
OS.XClearArea (display, window, x, y, width, height, true);
}
}
}
}
void register () {
if (handle == 0) return;
display.addWidget (handle, this);
}
void release (boolean destroy) {
if ((state & DISPOSE_SENT) == 0) {
state |= DISPOSE_SENT;
sendEvent (SWT.Dispose);
}
if ((state & DISPOSED) == 0) {
releaseChildren (destroy);
}
if ((state & RELEASED) == 0) {
state |= RELEASED;
if (destroy) {
releaseParent ();
releaseWidget ();
destroyWidget ();
} else {
releaseWidget ();
releaseHandle ();
}
}
}
void releaseChildren (boolean destroy) {
}
void releaseHandle () {
handle = 0;
state |= DISPOSED;
display = null;
}
void releaseParent () {
/* Do nothing */
}
void releaseWidget () {
deregister ();
eventTable = null;
data = null;
}
/**
* Removes the listener from the collection of listeners who will
* be notified when an event of the given type occurs. The event
* type is one of the event constants defined in class <code>SWT</code>.
*
* @param eventType the type of event to listen for
* @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 Listener
* @see SWT
* @see #addListener
* @see #getListeners(int)
* @see #notifyListeners
*/
public void removeListener (int eventType, Listener handler) {
checkWidget();
if (handler == null) error (SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null) return;
eventTable.unhook (eventType, handler);
}
/**
* Removes the listener from the collection of listeners who will
* be notified when an event of the given type occurs.
* <p>
* <b>IMPORTANT:</b> This method is <em>not</em> part of the SWT
* public API. It is marked public only so that it can be shared
* within the packages provided by SWT. It should never be
* referenced from application code.
* </p>
*
* @param eventType the type of event to listen for
* @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 Listener
* @see #addListener
*
* @noreference This method is not intended to be referenced by clients.
*/
protected void removeListener (int eventType, SWTEventListener handler) {
checkWidget();
if (handler == null) error (SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null) return;
eventTable.unhook (eventType, handler);
}
/**
* Marks the widget to be skinned.
* <p>
* The skin event is sent to the receiver's display when appropriate (usually before the next event
* is handled). Widgets are automatically marked for skinning upon creation as well as when its skin
* id or class changes. The skin id and/or class can be changed by calling <code>Display.setData(String, Object)</code>
* with the keys SWT.SKIN_ID and/or SWT.SKIN_CLASS. Once the skin event is sent to a widget, it
* will not be sent again unless <code>reskin(int)</code> is called on the widget or on an ancestor
* while specifying the <code>SWT.ALL</code> flag.
* </p>
* <p>
* The parameter <code>flags</code> may be either:
* <dl>
* <dt><b>SWT.ALL</b></dt>
* <dd>all children in the receiver's widget tree should be skinned</dd>
* <dt><b>SWT.NONE</b></dt>
* <dd>only the receiver should be skinned</dd>
* </dl>
* </p>
* @param flags the flags specifying how to reskin
*
* @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>
* @since 3.6
*/
public void reskin (int flags) {
checkWidget ();
reskinWidget ();
if ((flags & SWT.ALL) != 0) reskinChildren (flags);
}
void reskinChildren (int flags) {
}
void reskinWidget() {
if ((state & SKIN_NEEDED) != SKIN_NEEDED) {
this.state |= SKIN_NEEDED;
display.addSkinnableWidget(this);
}
}
/**
* Removes the listener from the collection of listeners who will
* be notified when the widget is disposed.
*
* @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 DisposeListener
* @see #addDisposeListener
*/
public void removeDisposeListener (DisposeListener listener) {
checkWidget();
if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
if (eventTable == null) return;
eventTable.unhook (SWT.Dispose, listener);
}
boolean setInputState (Event event, int state) {
if ((state & OS.Mod1Mask) != 0) event.stateMask |= SWT.ALT;
if ((state & OS.ShiftMask) != 0) event.stateMask |= SWT.SHIFT;
if ((state & OS.ControlMask) != 0) event.stateMask |= SWT.CONTROL;
if ((state & OS.Button1Mask) != 0) event.stateMask |= SWT.BUTTON1;
if ((state & OS.Button2Mask) != 0) event.stateMask |= SWT.BUTTON2;
if ((state & OS.Button3Mask) != 0) event.stateMask |= SWT.BUTTON3;
return true;
}
boolean setKeyState (Event event, XKeyEvent xEvent) {
if (xEvent.keycode == 0) return false;
byte [] buffer = new byte [5];
int [] keysym = new int [1];
OS.XLookupString (xEvent, buffer, buffer.length, keysym, null);
boolean isNull = display.fixKey (keysym, buffer, xEvent.state);
setLocationState (event, keysym [0]);
if (keysym [0] != 0) {
event.keyCode = Display.translateKey (keysym [0]);
}
if (event.keyCode == 0) {
byte [] buffer1 = new byte [5];
int [] keysym1 = new int [1];
int oldState = xEvent.state;
xEvent.state = 0;
OS.XLookupString (xEvent, buffer1, buffer1.length, keysym1, null);
xEvent.state = oldState;
if (buffer1 [0] != 0) {
char [] result = Converter.mbcsToWcs (null, buffer1);
if (result.length != 0) event.keyCode = result [0];
}
}
if (buffer [0] != 0) {
char [] result = Converter.mbcsToWcs (null, buffer);
if (result.length != 0) event.character = result [0];
}
if (event.keyCode == 0 && event.character == 0) {
if (!isNull) return false;
}
return setInputState (event, xEvent.state);
}
void setLocationState (Event event, int keysym) {
switch (keysym) {
case OS.XK_Alt_L:
case OS.XK_Meta_L:
case OS.XK_Control_L:
case OS.XK_Shift_L:
event.keyLocation = SWT.LEFT;
break;
case OS.XK_Alt_R:
case OS.XK_Meta_R:
case OS.XK_Control_R:
case OS.XK_Shift_R:
event.keyLocation = SWT.RIGHT;
break;
case OS.XK_KP_Enter:
case OS.XK_KP_F1:
case OS.XK_KP_F2:
case OS.XK_KP_F3:
case OS.XK_KP_F4:
case OS.XK_KP_Home:
case OS.XK_KP_Left:
case OS.XK_KP_Up:
case OS.XK_KP_Right:
case OS.XK_KP_Down:
case OS.XK_KP_Page_Up:
case OS.XK_KP_Page_Down:
case OS.XK_KP_End:
case OS.XK_KP_Insert:
case OS.XK_KP_Delete:
case OS.XK_KP_Equal:
case OS.XK_KP_Multiply:
case OS.XK_KP_Add:
case OS.XK_KP_Subtract:
case OS.XK_KP_Decimal:
case OS.XK_KP_Divide:
case OS.XK_KP_0:
case OS.XK_KP_1:
case OS.XK_KP_2:
case OS.XK_KP_3:
case OS.XK_KP_4:
case OS.XK_KP_5:
case OS.XK_KP_6:
case OS.XK_KP_7:
case OS.XK_KP_8:
case OS.XK_KP_9:
case OS.XK_Num_Lock:
event.keyLocation = SWT.KEYPAD;
break;
}
}
void sendEvent (Event event) {
Display display = event.display;
if (!display.filterEvent (event)) {
if (eventTable != null) eventTable.sendEvent (event);
}
}
void sendEvent (int eventType) {
sendEvent (eventType, null, true);
}
void sendEvent (int eventType, Event event) {
sendEvent (eventType, event, true);
}
void sendEvent (int eventType, Event event, boolean send) {
if (eventTable == null && !display.filters (eventType)) {
return;
}
if (event == null) event = new Event ();
event.type = eventType;
event.display = display;
event.widget = this;
if (event.time == 0) {
event.time = display.getLastEventTime ();
}
if (send) {
sendEvent (event);
} else {
display.postEvent (event);
}
}
boolean sendIMKeyEvent (int type, XKeyEvent xEvent) {
return sendIMKeyEvent (type, xEvent, 0);
}
boolean sendIMKeyEvent (int type, XKeyEvent xEvent, int textHandle) {
/*
* Bug in Motif. On Linux only, XmImMbLookupString () does not return
* XBufferOverflow as the status if the buffer is too small. The fix
* is to pass a large buffer.
*/
byte [] buffer = new byte [512];
int [] status = new int [1], unused = new int [1];
int focusHandle = OS.XtWindowToWidget (xEvent.display, xEvent.window);
int length = OS.XmImMbLookupString (focusHandle, xEvent, buffer, buffer.length, unused, status);
if (status [0] == OS.XBufferOverflow) {
buffer = new byte [length];
length = OS.XmImMbLookupString (focusHandle, xEvent, buffer, length, unused, status);
}
if (length == 0) return true;
/* Convert from MBCS to UNICODE and send the event */
/* Use the character encoding for the default locale */
char [] chars = Converter.mbcsToWcs (null, buffer);
int index = 0, count = 0;
while (index < chars.length) {
if (chars [index] == 0) {
chars [count] = 0;
break;
}
Event event = new Event ();
event.time = xEvent.time;
event.character = chars [index];
setInputState (event, xEvent.state);
sendEvent (type, event);
// widget could be disposed at this point
/*
* It is possible (but unlikely), that application
* code could have disposed the widget in the key
* events. If this happens, end the processing of
* the key by returning false.
*/
if (isDisposed ()) return false;
if (event.doit) chars [count++] = chars [index];
index++;
}
if (count == 0) return false;
if (textHandle != 0) {
/*
* Bug in Motif. On Solaris and Linux, XmImMbLookupString() clears
* the characters from the IME. This causes the characters to be
* stolen from the text widget. The fix is to detect that the IME
* has been cleared and use XmTextInsert() to insert the stolen
* characters. This problem does not happen on AIX.
*/
byte [] testBuffer = new byte [5];
int testLength = OS.XmImMbLookupString (textHandle, xEvent, testBuffer, testBuffer.length, unused, unused);
if (testLength == 0 || index != count) {
int [] start = new int [1], end = new int [1];
OS.XmTextGetSelectionPosition (textHandle, start, end);
if (start [0] == end [0]) {
start [0] = end [0] = OS.XmTextGetInsertionPosition (textHandle);
}
boolean warnings = display.getWarnings ();
display.setWarnings (false);
if (index != count) {
buffer = Converter.wcsToMbcs (getCodePage (), chars, true);
}
OS.XmTextReplace (textHandle, start [0], end [0], buffer);
int position = start [0] + count;
OS.XmTextSetInsertionPosition (textHandle, position);
display.setWarnings (warnings);
return false;
}
}
return true;
}
boolean sendKeyEvent (int type, XKeyEvent xEvent) {
Event event = new Event ();
event.time = xEvent.time;
if (!setKeyState (event, xEvent)) return true;
Widget control = this;
if ((state & CANVAS) != 0) {
if ((style & SWT.NO_FOCUS) != 0) {
control = display.getFocusControl ();
}
}
if (control != null) {
control.sendEvent (type, event);
// widget could be disposed at this point
/*
* It is possible (but unlikely), that application
* code could have disposed the widget in the key
* events. If this happens, end the processing of
* the key by returning false.
*/
if (isDisposed ()) return false;
}
return event.doit;
}
void sendSelectionEvent (int eventType) {
sendSelectionEvent (eventType, null, false);
}
void sendSelectionEvent (int eventType, Event event, boolean send) {
if (eventTable == null && !display.filters (eventType)) {
return;
}
if (event == null) event = new Event ();
// setInputState (event, state);
sendEvent (eventType, event, send);
}
/**
* Sets the application defined widget data associated
* with the receiver to be the argument. The <em>widget
* data</em> is a single, unnamed field that is stored
* with every widget.
* <p>
* Applications may put arbitrary objects in this field. If
* the object stored in the widget data needs to be notified
* when the widget is disposed of, it is the application's
* responsibility to hook the Dispose event on the widget and
* do so.
* </p>
*
* @param data the widget data
*
* @exception SWTException <ul>
* <li>ERROR_WIDGET_DISPOSED - when the receiver has been disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - when called from the wrong thread</li>
* </ul>
*
* @see #getData()
*/
public void setData (Object data) {
checkWidget();
if ((state & KEYED_DATA) != 0) {
((Object []) this.data) [0] = data;
} else {
this.data = data;
}
}
/**
* Sets the application defined property of the receiver
* with the specified name to the given value.
* <p>
* Applications may associate arbitrary objects with the
* receiver in this fashion. If the objects stored in the
* properties need to be notified when the widget is disposed
* of, it is the application's responsibility to hook the
* Dispose event on the widget and do so.
* </p>
*
* @param key the name of the property
* @param value the new value for the property
*
* @exception IllegalArgumentException <ul>
* <li>ERROR_NULL_ARGUMENT - if the key 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 #getData(String)
*/
public void setData (String key, Object value) {
checkWidget();
if (key == null) error (SWT.ERROR_NULL_ARGUMENT);
int index = 1;
Object [] table = null;
if ((state & KEYED_DATA) != 0) {
table = (Object []) data;
while (index < table.length) {
if (key.equals (table [index])) break;
index += 2;
}
}
if (value != null) {
if ((state & KEYED_DATA) != 0) {
if (index == table.length) {
Object [] newTable = new Object [table.length + 2];
System.arraycopy (table, 0, newTable, 0, table.length);
data = table = newTable;
}
} else {
table = new Object [3];
table [0] = data;
data = table;
state |= KEYED_DATA;
}
table [index] = key;
table [index + 1] = value;
} else {
if ((state & KEYED_DATA) != 0) {
if (index != table.length) {
int length = table.length - 2;
if (length == 1) {
data = table [0];
state &= ~KEYED_DATA;
} else {
Object [] newTable = new Object [length];
System.arraycopy (table, 0, newTable, 0, index);
System.arraycopy (table, index + 2, newTable, index, length - index);
data = newTable;
}
}
}
}
if (key.equals(SWT.SKIN_CLASS) || key.equals(SWT.SKIN_ID)) this.reskin(SWT.ALL);
}
/**
* Returns a string containing a concise, human-readable
* description of the receiver.
*
* @return a string representation of the receiver
*/
public String toString () {
String string = "*Disposed*";
if (!isDisposed ()) {
string = "*Wrong Thread*";
if (isValidThread ()) string = getNameText ();
}
return getName () + " {" + string + "}";
}
int topHandle () {
return handle;
}
boolean translateAccelerator (char key, int keysym, XKeyEvent xEvent, boolean doit) {
return false;
}
boolean translateMnemonic (char key, int keysym, XKeyEvent xEvent) {
return false;
}
boolean translateTraversal (int key, XKeyEvent xEvent) {
return false;
}
boolean XmProcessTraversal (int widget, int direction) {
/*
* Bug in Motif. When XtDestroyWidget() is called from
* within a FocusOut event handler, Motif GP's. The fix
* is to post focus events and run them when the handler
* has returned.
*/
Display display = this.display;
boolean oldFocusOut = display.postFocusOut;
display.postFocusOut = true;
boolean result = OS.XmProcessTraversal (widget, direction);
display.postFocusOut = oldFocusOut;
if (!display.postFocusOut) {
display.focusEvent = SWT.FocusOut;
display.runFocusOutEvents ();
display.focusEvent = SWT.None;
}
return result;
}
int hoverProc (int widget) {
return 0;
}
int timerProc (int id) {
return 0;
}
int windowProc (int w, int client_data, int call_data, int continue_to_dispatch) {
switch (client_data) {
case BUTTON_PRESS: return XButtonPress (w, client_data, call_data, continue_to_dispatch);
case BUTTON_RELEASE: return XButtonRelease (w, client_data, call_data, continue_to_dispatch);
case ENTER_WINDOW: return XEnterWindow (w, client_data, call_data, continue_to_dispatch);
case EXPOSURE: return XExposure (w, client_data, call_data, continue_to_dispatch);
case FOCUS_CHANGE: return XFocusChange (w, client_data, call_data, continue_to_dispatch);
case KEY_PRESS: return XKeyPress (w, client_data, call_data, continue_to_dispatch);
case KEY_RELEASE: return XKeyRelease (w, client_data, call_data, continue_to_dispatch);
case LEAVE_WINDOW: return XLeaveWindow (w, client_data, call_data, continue_to_dispatch);
case PROPERTY_CHANGE: return XPropertyChange (w, client_data, call_data, continue_to_dispatch);
case ACTIVATE_CALLBACK: return XmNactivateCallback (w, client_data, call_data);
case ARM_CALLBACK: return XmNarmCallback (w, client_data, call_data);
case BROWSE_SELECTION_CALLBACK: return XmNbrowseSelectionCallback (w, client_data, call_data);
case CASCADING_CALLBACK: return XmNcascadingCallback (w, client_data, call_data);
case DECREMENT_CALLBACK: return XmNdecrementCallback (w, client_data, call_data);
case DEFAULT_ACTION_CALLBACK: return XmNdefaultActionCallback (w, client_data, call_data);
case DRAG_CALLBACK: return XmNdragCallback (w, client_data, call_data);
case EXTENDED_SELECTION_CALLBACK: return XmNextendedSelectionCallback (w, client_data, call_data);
case HELP_CALLBACK: return XmNhelpCallback (w, client_data, call_data);
case INCREMENT_CALLBACK: return XmNincrementCallback (w, client_data, call_data);
case MODIFY_VERIFY_CALLBACK: return XmNmodifyVerifyCallback (w, client_data, call_data);
case MULTIPLE_SELECTION_CALLBACK: return XmNmultipleSelectionCallback (w, client_data, call_data);
case PAGE_DECREMENT_CALLBACK: return XmNpageDecrementCallback (w, client_data, call_data);
case PAGE_INCREMENT_CALLBACK: return XmNpageIncrementCallback (w, client_data, call_data);
case TO_BOTTOM_CALLBACK: return XmNtoBottomCallback (w, client_data, call_data);
case TO_TOP_CALLBACK: return XmNtoTopCallback (w, client_data, call_data);
case VALUE_CHANGED_CALLBACK: return XmNvalueChangedCallback (w, client_data, call_data);
case NON_MASKABLE: return XNonMaskable (w, client_data, call_data, continue_to_dispatch);
case POINTER_MOTION : return XPointerMotion (w, client_data, call_data, continue_to_dispatch);
case STRUCTURE_NOTIFY: return XStructureNotify (w, client_data, call_data, continue_to_dispatch);
case MAP_CALLBACK: return XmNmapCallback (w, client_data, call_data);
case UNMAP_CALLBACK: return XmNunmapCallback (w, client_data, call_data);
case DELETE_WINDOW: return WM_DELETE_WINDOW (w, client_data, call_data);
case EXPOSURE_CALLBACK: return XmNexposureCallback (w, client_data, call_data);
}
return 0;
}
int WM_DELETE_WINDOW (int w, int client_data, int call_data) {
return 0;
}
int XButtonPress (int w, int client_data, int call_data, int continue_to_dispatch) {
return 0;
}
int XButtonRelease (int w, int client_data, int call_data, int continue_to_dispatch) {
return 0;
}
int XEnterWindow (int w, int client_data, int call_data, int continue_to_dispatch) {
return 0;
}
int XExposure (int w, int client_data, int call_data, int continue_to_dispatch) {
return 0;
}
int XFocusChange (int w, int client_data, int call_data, int continue_to_dispatch) {
return 0;
}
int XKeyPress (int w, int client_data, int call_data, int continue_to_dispatch) {
XKeyEvent xEvent = new XKeyEvent ();
OS.memmove (xEvent, call_data, XKeyEvent.sizeof);
boolean doit = true;
if (xEvent.keycode != 0) {
doit = sendKeyEvent (SWT.KeyDown, xEvent);
} else {
doit = sendIMKeyEvent (SWT.KeyDown, xEvent);
}
if (!doit) {
OS.memmove (continue_to_dispatch, new int [1], 4);
return 1;
}
return 0;
}
int XKeyRelease (int w, int client_data, int call_data, int continue_to_dispatch) {
XKeyEvent xEvent = new XKeyEvent ();
OS.memmove (xEvent, call_data, XKeyEvent.sizeof);
if (!sendKeyEvent (SWT.KeyUp, xEvent)) {
OS.memmove (continue_to_dispatch, new int [1], 4);
return 1;
}
return 0;
}
int XLeaveWindow (int w, int client_data, int call_data, int continue_to_dispatch) {
return 0;
}
int XPointerMotion (int w, int client_data, int call_data, int continue_to_dispatch) {
return 0;
}
int XPropertyChange (int w, int client_data, int call_data, int continue_to_dispatch) {
return 0;
}
int XmNactivateCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNarmCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNbrowseSelectionCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNcascadingCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNdecrementCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNdefaultActionCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNdragCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNexposureCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNextendedSelectionCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNhelpCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNincrementCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNmapCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNmodifyVerifyCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNmultipleSelectionCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNpageDecrementCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNpageIncrementCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNtoBottomCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNtoTopCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNunmapCallback (int w, int client_data, int call_data) {
return 0;
}
int XmNvalueChangedCallback (int w, int client_data, int call_data) {
return 0;
}
int XNonMaskable (int w, int client_data, int call_data, int continue_to_dispatch) {
return 0;
}
int XStructureNotify (int w, int client_data, int call_data, int continue_to_dispatch) {
return 0;
}
}
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