display.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

				warningIcon = OS.LoadImage (0, OS.OIC_BANG, OS.IMAGE_ICON, 0, 0, OS.LR_SHARED);
			}
			hIcon = warningIcon;
			break;
	}
	if (hIcon == 0) return null;
	return Image.win32_new (this, SWT.ICON, hIcon);
}

/**
 * Returns the single instance of the system tray.
 *
 * @return the receiver's user-interface thread
 * 
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @since 3.0
 */
public Tray getSystemTray () {
	checkDevice ();
	if (tray != null) return tray;
	return tray = new Tray (this, SWT.NONE);
}

/**
 * Returns the user-interface thread for the receiver.
 *
 * @return the receiver's user-interface thread
 * 
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public Thread getThread () {
	if (isDisposed ()) error (SWT.ERROR_DEVICE_DISPOSED);
	return thread;
}

/**	 
 * Invokes platform specific functionality to allocate a new GC handle.
 * <p>
 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
 * API for <code>Display</code>. 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 called from
 * application code.
 * </p>
 *
 * @param data the platform specific GC data 
 * @return the platform specific GC handle
 * 
 * @exception SWTError <ul>
 *    <li>ERROR_NO_HANDLES if a handle could not be obtained for image creation</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public int internal_new_GC (GCData data) {
	if (isDisposed()) SWT.error(SWT.ERROR_DEVICE_DISPOSED);
	int hDC = OS.GetDC (0);
	if (hDC == 0) SWT.error (SWT.ERROR_NO_HANDLES);
	if (data != null) {
		int mask = SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT;
		if ((data.style & mask) != 0) {
			data.layout = (data.style & SWT.RIGHT_TO_LEFT) != 0 ? OS.LAYOUT_RTL : 0;
		} else {
			data.style |= SWT.LEFT_TO_RIGHT;
		}
		data.device = this;
		data.hFont = systemFont ();
	}
	return hDC;
}

/**
 * Initializes any internal resources needed by the
 * device.
 * <p>
 * This method is called after <code>create</code>.
 * </p>
 * 
 * @see #create
 */
protected void init () {
	super.init ();
		
	/* Create the callbacks */
	windowCallback = new Callback (this, "windowProc", 4); //$NON-NLS-1$
	windowProc = windowCallback.getAddress ();
	if (windowProc == 0) error (SWT.ERROR_NO_MORE_CALLBACKS);
	
	/* Remember the current procsss and thread */
	threadId = OS.GetCurrentThreadId ();
	processId = OS.GetCurrentProcessId ();
	
	/* Use the character encoding for the default locale */
	windowClass = new TCHAR (0, WindowName + WindowClassCount++, true);

	/* Register the SWT window class */
	int hHeap = OS.GetProcessHeap ();
	int hInstance = OS.GetModuleHandle (null);
	WNDCLASS lpWndClass = new WNDCLASS ();
	lpWndClass.hInstance = hInstance;
	lpWndClass.lpfnWndProc = windowProc;
	lpWndClass.style = OS.CS_BYTEALIGNWINDOW | OS.CS_DBLCLKS;
	lpWndClass.hCursor = OS.LoadCursor (0, OS.IDC_ARROW);
	int byteCount = windowClass.length () * TCHAR.sizeof;
	int lpszClassName = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, byteCount);
	lpWndClass.lpszClassName = lpszClassName;
	OS.MoveMemory (lpszClassName, windowClass, byteCount);
	OS.RegisterClass (lpWndClass);
	
	/* Initialize the system font */
	int systemFont = 0;
	if (!OS.IsWinCE) {
		NONCLIENTMETRICS info = OS.IsUnicode ? (NONCLIENTMETRICS) new NONCLIENTMETRICSW () : new NONCLIENTMETRICSA ();
		info.cbSize = NONCLIENTMETRICS.sizeof;
		if (OS.SystemParametersInfo (OS.SPI_GETNONCLIENTMETRICS, 0, info, 0)) {
			systemFont = OS.CreateFontIndirect (OS.IsUnicode ? (LOGFONT) ((NONCLIENTMETRICSW)info).lfMessageFont : ((NONCLIENTMETRICSA)info).lfMessageFont);
		}
	}
	if (systemFont == 0) systemFont = OS.GetStockObject (OS.DEFAULT_GUI_FONT);
	if (systemFont == 0) systemFont = OS.GetStockObject (OS.SYSTEM_FONT);
	if (systemFont != 0) systemFonts = new int [] {systemFont};
	
	/* Create the message only HWND */
	hwndMessage = OS.CreateWindowEx (0,
		windowClass,
		null,
		OS.WS_OVERLAPPED,
		0, 0, 0, 0,
		0,
		0,
		hInstance,
		null);
	messageCallback = new Callback (this, "messageProc", 4); //$NON-NLS-1$
	messageProc = messageCallback.getAddress ();
	if (messageProc == 0) error (SWT.ERROR_NO_MORE_CALLBACKS);
	OS.SetWindowLong (hwndMessage, OS.GWL_WNDPROC, messageProc);

	/* Create the filter hook */
	if (!OS.IsWinCE) {
		msgFilterCallback = new Callback (this, "msgFilterProc", 3); //$NON-NLS-1$
		msgFilterProc = msgFilterCallback.getAddress ();
		if (msgFilterProc == 0) error (SWT.ERROR_NO_MORE_CALLBACKS);
		filterHook = OS.SetWindowsHookEx (OS.WH_MSGFILTER, msgFilterProc, 0, threadId);
	}
	
	/* Register the task bar created message */
	SWT_TASKBARCREATED = OS.RegisterWindowMessage (new TCHAR (0, "TaskbarCreated", true));

	/* Initialize the Widget Table */
	indexTable = new int [GROW_SIZE];
	controlTable = new Control [GROW_SIZE];
	for (int i=0; i<GROW_SIZE-1; i++) indexTable [i] = i + 1;
	indexTable [GROW_SIZE - 1] = -1;
}

/**	 
 * Invokes platform specific functionality to dispose a GC handle.
 * <p>
 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
 * API for <code>Display</code>. 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 called from
 * application code.
 * </p>
 *
 * @param hDC the platform specific GC handle
 * @param data the platform specific GC data 
 */
public void internal_dispose_GC (int hDC, GCData data) {
	OS.ReleaseDC (0, hDC);
}

boolean isValidThread () {
	return thread == Thread.currentThread ();
}

/**
 * Maps a point from one coordinate system to another.
 * When the control is null, coordinates are mapped to
 * the display.
 * <p>
 * NOTE: On right-to-left platforms where the coordinate
 * systems are mirrored, special care needs to be taken
 * when mapping coordinates from one control to another
 * to ensure the result is correctly mirrored.
 * 
 * Mapping a point that is the origin of a rectangle and
 * then adding the width and height is not equivalent to
 * mapping the rectangle.  When one control is mirrored
 * and the other is not, adding the width and height to a
 * point that was mapped causes the rectangle to extend
 * in the wrong direction.  Mapping the entire rectangle
 * instead of just one point causes both the origin and
 * the corner of the rectangle to be mapped.
 * </p>
 * 
 * @param from the source <code>Control</code> or <code>null</code>
 * @param to the destination <code>Control</code> or <code>null</code>
 * @param point to be mapped 
 * @return point with mapped coordinates 
 * 
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the rectangle is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the Control from or the Control to have been disposed</li> 
 * </ul>
 * @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>
 * 
 * @since 2.1.2
 */
public Point map (Control from, Control to, Point point) {
	checkDevice ();
	if (point == null) error (SWT.ERROR_NULL_ARGUMENT);	
	return map (from, to, point.x, point.y);
}

/**
 * Maps a point from one coordinate system to another.
 * When the control is null, coordinates are mapped to
 * the display.
 * <p>
 * NOTE: On right-to-left platforms where the coordinate
 * systems are mirrored, special care needs to be taken
 * when mapping coordinates from one control to another
 * to ensure the result is correctly mirrored.
 * 
 * Mapping a point that is the origin of a rectangle and
 * then adding the width and height is not equivalent to
 * mapping the rectangle.  When one control is mirrored
 * and the other is not, adding the width and height to a
 * point that was mapped causes the rectangle to extend
 * in the wrong direction.  Mapping the entire rectangle
 * instead of just one point causes both the origin and
 * the corner of the rectangle to be mapped.
 * </p>
 * 
 * @param from the source <code>Control</code> or <code>null</code>
 * @param to the destination <code>Control</code> or <code>null</code>
 * @param x coordinates to be mapped
 * @param y coordinates to be mapped
 * @return point with mapped coordinates
 * 
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the Control from or the Control to have been disposed</li> 
 * </ul>
 * @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>
 * 
 * @since 2.1.2
 */
public Point map (Control from, Control to, int x, int y) {
	checkDevice ();
	if (from != null && from.isDisposed()) error (SWT.ERROR_INVALID_ARGUMENT);
	if (to != null && to.isDisposed()) error (SWT.ERROR_INVALID_ARGUMENT);
	int hwndFrom = from != null ? from.handle : 0;
	int hwndTo = to != null ? to.handle : 0;
	POINT point = new POINT ();
	point.x = x;
	point.y = y;
	OS.MapWindowPoints (hwndFrom, hwndTo, point, 1);
	return new Point (point.x, point.y);
}

/**
 * Maps a point from one coordinate system to another.
 * When the control is null, coordinates are mapped to
 * the display.
 * <p>
 * NOTE: On right-to-left platforms where the coordinate
 * systems are mirrored, special care needs to be taken
 * when mapping coordinates from one control to another
 * to ensure the result is correctly mirrored.
 * 
 * Mapping a point that is the origin of a rectangle and
 * then adding the width and height is not equivalent to
 * mapping the rectangle.  When one control is mirrored
 * and the other is not, adding the width and height to a
 * point that was mapped causes the rectangle to extend
 * in the wrong direction.  Mapping the entire rectangle
 * instead of just one point causes both the origin and
 * the corner of the rectangle to be mapped.
 * </p>
 * 
 * @param from the source <code>Control</code> or <code>null</code>
 * @param to the destination <code>Control</code> or <code>null</code>
 * @param rectangle to be mapped
 * @return rectangle with mapped coordinates
 * 
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the rectangle is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the Control from or the Control to have been disposed</li> 
 * </ul>
 * @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>
 * 
 * @since 2.1.2
 */
public Rectangle map (Control from, Control to, Rectangle rectangle) {
	checkDevice ();
	if (rectangle == null) error (SWT.ERROR_NULL_ARGUMENT);	
	return map (from, to, rectangle.x, rectangle.y, rectangle.width, rectangle.height);
}

/**
 * Maps a point from one coordinate system to another.
 * When the control is null, coordinates are mapped to
 * the display.
 * <p>
 * NOTE: On right-to-left platforms where the coordinate
 * systems are mirrored, special care needs to be taken
 * when mapping coordinates from one control to another
 * to ensure the result is correctly mirrored.
 * 
 * Mapping a point that is the origin of a rectangle and
 * then adding the width and height is not equivalent to
 * mapping the rectangle.  When one control is mirrored
 * and the other is not, adding the width and height to a
 * point that was mapped causes the rectangle to extend
 * in the wrong direction.  Mapping the entire rectangle
 * instead of just one point causes both the origin and
 * the corner of the rectangle to be mapped.
 * </p>
 * 
 * @param from the source <code>Control</code> or <code>null</code>
 * @param to the destination <code>Control</code> or <code>null</code>
 * @param x coordinates to be mapped
 * @param y coordinates to be mapped
 * @param width coordinates to be mapped
 * @param height coordinates to be mapped
 * @return rectangle with mapped coordinates
 * 
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the Control from or the Control to have been disposed</li> 
 * </ul>
 * @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>
 * 
 * @since 2.1.2
 */
public Rectangle map (Control from, Control to, int x, int y, int width, int height) {
	checkDevice ();
	if (from != null && from.isDisposed()) error (SWT.ERROR_INVALID_ARGUMENT);
	if (to != null && to.isDisposed()) error (SWT.ERROR_INVALID_ARGUMENT);
	int hwndFrom = from != null ? from.handle : 0;
	int hwndTo = to != null ? to.handle : 0;
	RECT rect = new RECT ();
	rect.left = x;
	rect.top  = y;
	rect.right = x + width;
	rect.bottom = y + height;
	OS.MapWindowPoints (hwndFrom, hwndTo, rect, 2);
	return new Rectangle (rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top);
}

/*
 * Returns a single character, converted from the default
 * multi-byte character set (MBCS) used by the operating
 * system widgets to a wide character set (WCS) used by Java.
 *
 * @param ch the MBCS character
 * @return the WCS character
 */
static char mbcsToWcs (int ch) {
	return mbcsToWcs (ch, 0);
}

/*
 * Returns a single character, converted from the specified
 * multi-byte character set (MBCS) used by the operating
 * system widgets to a wide character set (WCS) used by Java.
 *
 * @param ch the MBCS character
 * @param codePage the code page used to convert the character
 * @return the WCS character
 */
static char mbcsToWcs (int ch, int codePage) {
	if (OS.IsUnicode) return (char) ch;
	int key = ch & 0xFFFF;
	if (key <= 0x7F) return (char) ch;
	byte [] buffer;
	if (key <= 0xFF) {
		buffer = new byte [1];
		buffer [0] = (byte) key;
	} else {
		buffer = new byte [2];
		buffer [0] = (byte) ((key >> 8) & 0xFF);
		buffer [1] = (byte) (key & 0xFF);
	}
	char [] unicode = new char [1];
	int cp = codePage != 0 ? codePage : OS.CP_ACP;
	int count = OS.MultiByteToWideChar (cp, OS.MB_PRECOMPOSED, buffer, buffer.length, unicode, 1);
	if (count == 0) return 0;
	return unicode [0];
}

int messageProc (int hwnd, int msg, int wParam, int lParam) {
	switch (msg) {
		case SWT_KEYMSG:
			boolean consumed = false;
			MSG keyMsg = new MSG ();
			OS.MoveMemory (keyMsg, lParam, MSG.sizeof);
			Control control = findControl (keyMsg.hwnd);
			if (control != null) {
				keyMsg.hwnd = control.handle;
				int flags = OS.PM_REMOVE | OS.PM_NOYIELD | OS.PM_QS_INPUT | OS.PM_QS_POSTMESSAGE;
				do {
					if (!(consumed |= filterMessage (keyM