display.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

 * @see #removeListener
 * 
 * @since 2.0 
 */
public void addListener (int eventType, Listener listener) {
	checkDevice ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) eventTable = new EventTable ();
	eventTable.hook (eventType, listener);
}

void addBar (Menu menu) {
	if (bars == null) bars = new Menu [4];
	int length = bars.length;
	for (int i=0; i<length; i++) {
		if (bars [i] == menu) return;
	}
	int index = 0;
	while (index < length) {
		if (bars [index] == null) break;
		index++;
	}
	if (index == length) {
		Menu [] newBars = new Menu [length + 4];
		System.arraycopy (bars, 0, newBars, 0, length);
		bars = newBars;
	}
	bars [index] = menu;
}

void addControl (int handle, Control control) {
	if (handle == 0) return;
	if (freeSlot == -1) {
		int length = (freeSlot = indexTable.length) + GROW_SIZE;
		int [] newIndexTable = new int [length];
		Control [] newControlTable = new Control [length];
		System.arraycopy (indexTable, 0, newIndexTable, 0, freeSlot);
		System.arraycopy (controlTable, 0, newControlTable, 0, freeSlot);
		for (int i=freeSlot; i<length-1; i++) newIndexTable [i] = i + 1;
		newIndexTable [length - 1] = -1;
		indexTable = newIndexTable;
		controlTable = newControlTable;
	}
	OS.SetWindowLong (handle, OS.GWL_USERDATA, freeSlot + 1);
	int oldSlot = freeSlot;
	freeSlot = indexTable [oldSlot];
	indexTable [oldSlot] = -2;
	controlTable [oldSlot] = control;
}

void addMenuItem (MenuItem item) {
	if (items == null) items = new MenuItem [64];
	for (int i=0; i<items.length; i++) {
		if (items [i] == null) {
			item.id = i + ID_START;
			items [i] = item;
			return;
		}
	}
	item.id = items.length + ID_START;
	MenuItem [] newItems = new MenuItem [items.length + 64];
	newItems [items.length] = item;
	System.arraycopy (items, 0, newItems, 0, items.length);
	items = newItems;
}

void addPopup (Menu menu) {
	if (popups == null) popups = new Menu [4];
	int length = popups.length;
	for (int i=0; i<length; i++) {
		if (popups [i] == menu) return;
	}
	int index = 0;
	while (index < length) {
		if (popups [index] == null) break;
		index++;
	}
	if (index == length) {
		Menu [] newPopups = new Menu [length + 4];
		System.arraycopy (popups, 0, newPopups, 0, length);
		popups = newPopups;
	}
	popups [index] = menu;
}

/**
 * Causes the <code>run()</code> method of the runnable to
 * be invoked by the user-interface thread at the next 
 * reasonable opportunity. The caller of this method continues 
 * to run in parallel, and is not notified when the
 * runnable has completed.
 *
 * @param runnable code to run on the user-interface thread.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 * 
 * @see #syncExec
 */
public void asyncExec (Runnable runnable) {
	if (isDisposed ()) error (SWT.ERROR_DEVICE_DISPOSED);
	synchronizer.asyncExec (runnable);
}

/**
 * Causes the system hardware to emit a short sound
 * (if it supports this capability).
 * 
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void beep () {
	checkDevice ();
	OS.MessageBeep (OS.MB_OK);
}

/**
 * Checks that this class can be subclassed.
 * <p>
 * IMPORTANT: See the comment in <code>Widget.checkSubclass()</code>.
 * </p>
 *
 * @exception SWTException <ul>
 *    <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed subclass</li>
 * </ul>
 *
 * @see Widget#checkSubclass
 */
protected void checkSubclass () {
	if (!isValidClass (getClass ())) error (SWT.ERROR_INVALID_SUBCLASS);
}

protected void checkDevice () {
	if (thread == null) error (SWT.ERROR_WIDGET_DISPOSED);
	if (thread != Thread.currentThread ()) error (SWT.ERROR_THREAD_INVALID_ACCESS);
	if (isDisposed ()) error (SWT.ERROR_DEVICE_DISPOSED);
}

static synchronized void checkDisplay (Thread thread) {
	for (int i=0; i<Displays.length; i++) {
		if (Displays [i] != null && Displays [i].thread == thread) {
			SWT.error (SWT.ERROR_THREAD_INVALID_ACCESS);
		}
	}
}

void clearModal (Shell shell) {
	if (modalShells == null) return;
	int index = 0, length = modalShells.length;
	while (index < length) {
		if (modalShells [index] == shell) break;
		if (modalShells [index] == null) return;
		index++;
	}
	if (index == length) return;
	System.arraycopy (modalShells, index + 1, modalShells, index, --length - index);
	modalShells [length] = null;
	if (index == 0 && modalShells [0] == null) modalShells = null;
	Shell [] shells = getShells ();
	for (int i=0; i<shells.length; i++) shells [i].updateModal ();
}

int controlKey (int key) {
	int upper = OS.CharUpper ((short) key);
	if (64 <= upper && upper <= 95) return upper & 0xBF;
	return key;
}

/**
 * Requests that the connection between SWT and the underlying
 * operating system be closed.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see Device#dispose
 * 
 * @since 2.0
 */
public void close () {
	checkDevice ();
	Event event = new Event ();
	sendEvent (SWT.Close, event);
	if (event.doit) dispose ();
}

/**
 * Creates the device in the operating system.  If the device
 * does not have a handle, this method may do nothing depending
 * on the device.
 * <p>
 * This method is called before <code>init</code>.
 * </p>
 *
 * @param data the DeviceData which describes the receiver
 *
 * @see #init
 */
protected void create (DeviceData data) {
	checkSubclass ();
	checkDisplay (thread = Thread.currentThread ());
	createDisplay (data);
	register (this);
	if (Default == null) Default = this;
}

void createDisplay (DeviceData data) {
}

static synchronized void deregister (Display display) {
	for (int i=0; i<Displays.length; i++) {
		if (display == Displays [i]) Displays [i] = null;
	}
}

/**
 * Destroys the device in the operating system and releases
 * the device's handle.  If the device does not have a handle,
 * this method may do nothing depending on the device.
 * <p>
 * This method is called after <code>release</code>.
 * </p>
 * @see #dispose
 * @see #release
 */
protected void destroy () {
	if (this == Default) Default = null;
	deregister (this);
	destroyDisplay ();
}

void destroyDisplay () {
}

/**
 * Causes the <code>run()</code> method of the runnable to
 * be invoked by the user-interface thread just before the
 * receiver is disposed.
 *
 * @param runnable code to run at dispose time.
 * 
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void disposeExec (Runnable runnable) {
	checkDevice ();
	if (disposeList == null) disposeList = new Runnable [4];
	for (int i=0; i<disposeList.length; i++) {
		if (disposeList [i] == null) {
			disposeList [i] = runnable;
			return;
		}
	}
	Runnable [] newDisposeList = new Runnable [disposeList.length + 4];
	System.arraycopy (disposeList, 0, newDisposeList, 0, disposeList.length);
	newDisposeList [disposeList.length] = runnable;
	disposeList = newDisposeList;
}

void drawMenuBars () {
	if (bars == null) return;
	for (int i=0; i<bars.length; i++) {
		Menu menu = bars [i];
		if (menu != null && !menu.isDisposed ()) menu.update ();
	}
	bars = null;
}

int embeddedProc (int hwnd, int msg, int wParam, int lParam) {
	switch (msg) {
		case SWT_KEYMSG: {
			MSG keyMsg = new MSG ();
			OS.MoveMemory (keyMsg, lParam, MSG.sizeof);
			OS.TranslateMessage (keyMsg);
			OS.DispatchMessage (keyMsg);
			int hHeap = OS.GetProcessHeap ();
			OS.HeapFree (hHeap, 0, lParam);
			break;
		}
		case SWT_DESTROY: {
			OS.DestroyWindow (hwnd);
			if (embeddedCallback != null) embeddedCallback.dispose ();
			if (getMsgCallback != null) getMsgCallback.dispose ();
			embeddedCallback = getMsgCallback = null;
			embeddedProc = getMsgProc = 0;
			break;
		}
		case SWT_RESIZE: {
			int flags = OS.SWP_NOZORDER | OS.SWP_DRAWFRAME | OS.SWP_NOACTIVATE;
			OS.SetWindowPos (wParam, 0, 0, 0, lParam & 0xFFFF, lParam >> 16, flags);
			break;
		}
	}
	return OS.DefWindowProc (hwnd, msg, wParam, lParam);
}

/**
 * Does whatever display specific cleanup is required, and then
 * uses the code in <code>SWTError.error</code> to handle the error.
 *
 * @param code the descriptive error code
 *
 * @see SWTError#error
 */
void error (int code) {
	SWT.error (code);
}

boolean filterEvent (Event event) {
	if (filterTable != null) filterTable.sendEvent (event);
	return false;
}

boolean filters (int eventType) {
	if (filterTable == null) return false;
	return filterTable.hooks (eventType);
}

boolean filterMessage (MSG msg) {
	int message = msg.message;
	if (OS.WM_KEYFIRST <= message && message <= OS.WM_KEYLAST) {
		Control control = findControl (msg.hwnd);
		if (control != null) {
			if (translateAccelerator (msg, control) || translateMnemonic (msg, control) || translateTraversal (msg, control)) {	
				lastAscii = lastKey = 0;
				lastVirtual = lastNull = lastDead = false;
				return true;
			}
		}
	}
	return false;
}

/**
 * Given the operating system handle for a widget, returns
 * the instance of the <code>Widget</code> subclass which
 * represents it in the currently running application, if
 * such exists, or null if no matching widget can be found.
 *
 * @param handle the handle for the widget
 * @return the SWT widget that the handle represents
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public Widget findWidget (int handle) {
	checkDevice ();
	return getControl (handle);
}

Control findControl (int handle) {
	if (handle == 0) return null;
	do {
		Control control = getControl (handle);
		if (control != null) return control;
	} while ((handle = OS.GetParent (handle)) != 0);
	return null;
}

/**
 * Returns the display which the given thread is the
 * user-interface thread for, or null if the given thread
 * is not a user-interface thread for any display.
 *
 * @param thread the user-interface thread
 * @return the display for the given thread
 */
public static synchronized Display findDisplay (Thread thread) {
	for (int i=0; i<Displays.length; i++) {
		Display display = Displays [i];
		if (display != null && display.thread == thread) {
			return display;
		}
	}
	return null;
}

/**
 * Returns the currently active <code>Shell</code>, or null
 * if no shell belonging to the currently running application
 * is active.
 *
 * @return the active shell or null
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public Shell getActiveShell () {
	checkDevice ();
	Control control = findControl (OS.GetActiveWindow ());
	return control != null ? control.getShell () : null;
}

/**
 * Returns a rectangle describing the receiver's size and location.
 *
 * @return the bounding rectangle
 *
 * @exception SWTException <ul>
 *    <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public Rectangle getBounds () {
	checkDevice ();
	if (OS.GetSystemMetrics (OS.SM_CMONITORS) < 2) {
		int width = OS.GetSystemMetrics (OS.SM_CXSCREEN);
		int height = OS.GetSystemMetrics (OS.SM_CYSCREEN);
		return new Rectangle (0, 0, width, height);
	}
	int x = OS.GetSystemMetrics (OS.SM_XVIRTUALSCREEN);
	int y = OS.GetSystemMetrics (OS.SM_YVIRTUALSCREEN);