text.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

int defaultBackground () {
	return OS.GetSysColor (OS.COLOR_WINDOW);
}

void fixAlignment () {
	/*
	* Feature in Windows.  When the edit control is not
	* mirrored, it uses WS_EX_RIGHT, WS_EX_RTLREADING and
	* WS_EX_LEFTSCROLLBAR to give the control a right to
	* left appearance.  This causes the control to be lead
	* aligned no matter what alignment was specified by
	* the programmer.  For example, setting ES_RIGHT and
	* WS_EX_LAYOUTRTL should cause the contents of the
	* control to be left (trail) aligned in a mirrored world.
	* When the orientation is changed by the user or
	* specified by the programmer, WS_EX_RIGHT conflicts
	* with the mirrored alignment.  The fix is to clear
	* or set WS_EX_RIGHT to achieve the correct alignment
	* according to the orientation and mirroring.
	*/
	if ((style & SWT.MIRRORED) != 0) return;
	int bits0 = OS.GetWindowLong (handle, OS.GWL_EXSTYLE);
	int bits1 = OS.GetWindowLong (handle, OS.GWL_STYLE);
	if ((style & SWT.LEFT_TO_RIGHT) != 0) {
		/*
		* Bug in Windows 98. When the edit control is created
		* with the style ES_RIGHT it automatically sets the 
		* WS_EX_LEFTSCROLLBAR bit.  The fix is to clear the
		* bit when the orientation of the control is left
		* to right.
		*/
		bits0 &= ~OS.WS_EX_LEFTSCROLLBAR;
		if ((style & SWT.RIGHT) != 0) {
			bits0 |= OS.WS_EX_RIGHT;
			bits1 |= OS.ES_RIGHT;
		}
		if ((style & SWT.LEFT) != 0) {
			bits0 &= ~OS.WS_EX_RIGHT;
			bits1 &= ~OS.ES_RIGHT;
		}
	} else {
		if ((style & SWT.RIGHT) != 0) {
			bits0 &= ~OS.WS_EX_RIGHT;
			bits1 &= ~OS.ES_RIGHT;
		}
		if ((style & SWT.LEFT) != 0) {
			bits0 |= OS.WS_EX_RIGHT;
			bits1 |= OS.ES_RIGHT;
		}
	}
	if ((style & SWT.CENTER) != 0) {
		bits1 |= OS.ES_CENTER;
	}	
	OS.SetWindowLong (handle, OS.GWL_EXSTYLE, bits0);
	OS.SetWindowLong (handle, OS.GWL_STYLE, bits1);
}

public int getBorderWidth () {
	checkWidget ();
	/*
	* Feature in Windows 2000 and XP.  Despite the fact that WS_BORDER
	* is set when the edit control is created, the style bit is cleared.
	* The fix is to avoid the check for WS_BORDER and use the SWT widget
	* style bits instead.
	*/
//	if ((style & SWT.BORDER) != 0 && (style & SWT.FLAT) != 0) {
//		return OS.GetSystemMetrics (OS.SM_CXBORDER);
//	}
	return super.getBorderWidth ();
}

/**
 * Gets the line number of the caret.
 * <p>
 * The line number of the caret is returned.
 * </p>
 *
 * @return the line number
 *
 * @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 getCaretLineNumber () {
	checkWidget ();
	return OS.SendMessage (handle, OS.EM_LINEFROMCHAR, -1, 0);
}

/**
 * Gets the location the caret.
 * <p>
 * The location of the caret is returned.
 * </p>
 *
 * @return a point, the location of the caret
 *
 * @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 Point getCaretLocation () {
	checkWidget ();
	/*
	* Bug in Windows.  For some reason, Windows is unable
	* to return the pixel coordinates of the last character
	* in the widget.  The fix is to temporarily insert a
	* space, query the coordinates and delete the space.
	* The selection is always an i-beam in this case because
	* this is the only time the start of the selection can
	* be equal to the last character position in the widget.
	* If EM_POSFROMCHAR fails for any other reason, return
	* pixel coordinates (0,0). 
	*/
	int [] start = new int [1];
	OS.SendMessage (handle, OS.EM_GETSEL, start, (int []) null);
	int pos = OS.SendMessage (handle, OS.EM_POSFROMCHAR, start [0], 0);
	if (pos == -1) {
		pos = 0;
		if (start [0] >= OS.GetWindowTextLength (handle)) {
			int cp = getCodePage ();
			/*
			* Feature in Windows.  When an edit control with ES_MULTILINE
			* style that does not have the WS_VSCROLL style is full (i.e.
			* there is no space at the end to draw any more characters),
			* EM_REPLACESEL sends a WM_CHAR with a backspace character
			* to remove any further text that is added.  This is an
			* implementation detail of the edit control that is unexpected
			* and can cause endless recursion when EM_REPLACESEL is sent
			* from a WM_CHAR handler.  The fix is to ignore calling the
			* handler from WM_CHAR.
			*/
			ignoreCharacter = ignoreModify = true;
			OS.SendMessage (handle, OS.EM_REPLACESEL, 0, new TCHAR (cp, " ", true));
			pos = OS.SendMessage (handle, OS.EM_POSFROMCHAR, start [0], 0);
			OS.SendMessage (handle, OS.EM_SETSEL, start [0], start [0] + 1);
			OS.SendMessage (handle, OS.EM_REPLACESEL, 0, new TCHAR (cp, "", true));
			ignoreCharacter = ignoreModify = false;
		}
	}
	return new Point ((short) (pos & 0xFFFF), (short) (pos >> 16));
}

/**
 * Gets the position of the caret.
 * <p>
 * The character position of the caret is returned.
 * </p>
 *
 * @return the position of the caret
 *
 * @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 getCaretPosition () {
	checkWidget ();
	int [] start = new int [1], end = new int [1];
	OS.SendMessage (handle, OS.EM_GETSEL, start, end);
	int startLine = OS.SendMessage (handle, OS.EM_LINEFROMCHAR, start [0], 0);
	int caretPos = OS.SendMessage (handle, OS.EM_LINEINDEX, -1, 0);
	int caretLine = OS.SendMessage (handle, OS.EM_LINEFROMCHAR, caretPos, 0);
	int caret = end [0];
	if (caretLine == startLine) caret = start [0];
	if (OS.IsDBLocale) caret = mbcsToWcsPos (caret);
	return caret;
}

/**
 * Gets the number of characters.
 *
 * @return number of characters in the widget
 *
 * @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 getCharCount () {
	checkWidget ();
	int length = OS.GetWindowTextLength (handle);
	if (OS.IsDBLocale) length = mbcsToWcsPos (length);
	return length;
}

String getClipboardText () {
	String string = "";
	if (OS.OpenClipboard (0)) {
		int hMem = OS.GetClipboardData (OS.IsUnicode ? OS.CF_UNICODETEXT : OS.CF_TEXT);
		if (hMem != 0) {
			/* Ensure byteCount is a multiple of 2 bytes on UNICODE platforms */
			int byteCount = OS.GlobalSize (hMem) / TCHAR.sizeof * TCHAR.sizeof;
			int ptr = OS.GlobalLock (hMem);
			if (ptr != 0) {
				/* Use the character encoding for the default locale */
				TCHAR buffer = new TCHAR (0, byteCount / TCHAR.sizeof);
				OS.MoveMemory (buffer, ptr, byteCount);
				string = buffer.toString (0, buffer.strlen ());
				OS.GlobalUnlock (hMem);
			}
		}
		OS.CloseClipboard ();
	}
	return string;
}

/**
 * Gets the double click enabled flag.
 * <p>
 * The double click flag enables or disables the
 * default action of the text widget when the user
 * double clicks.
 * </p>
 * 
 * @return whether or not double click is enabled
 *
 * @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 getDoubleClickEnabled () {
	checkWidget ();
	return doubleClick;
}

/**
 * Gets the echo character.
 * <p>
 * The echo character is the character that is
 * displayed when the user enters text or the
 * text is changed by the programmer.
 * </p>
 * 
 * @return the echo character
 *
 * @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 char getEchoChar () {
	checkWidget ();
	char echo = (char) OS.SendMessage (handle, OS.EM_GETPASSWORDCHAR, 0, 0);
	if (echo != 0 && (echo = Display.mbcsToWcs (echo, getCodePage ())) == 0) echo = '*';
	return echo;
}

/**
 * Gets the editable state.
 *
 * @return whether or not the reciever is editable
 * 
 * @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 getEditable () {
	checkWidget ();
	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	return (bits & OS.ES_READONLY) == 0;
}

/**
 * Gets the number of lines.
 *
 * @return the number of lines in the widget
 *
 * @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 getLineCount () {
	checkWidget ();
	return OS.SendMessage (handle, OS.EM_GETLINECOUNT, 0, 0);
}

/**
 * Gets the line delimiter.
 *
 * @return a string that is the line delimiter
 *
 * @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 String getLineDelimiter () {
	checkWidget ();
	return DELIMITER;
}

/**
 * Gets the height of a line.
 *
 * @return the height of a row of text
 *
 * @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 getLineHeight () {
	checkWidget ();
	int newFont, oldFont = 0;
	int hDC = OS.GetDC (handle);
	newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
	if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	TEXTMETRIC tm = OS.IsUnicode ? (TEXTMETRIC) new TEXTMETRICW () : new TEXTMETRICA ();
	OS.GetTextMetrics (hDC, tm);
	if (newFont != 0) OS.SelectObject (hDC, oldFont);
	OS.ReleaseDC (handle, hDC);
	return tm.tmHeight;
}

/**
 * Returns the orientation of the receiver.
 *
 * @return the orientation style
 * 
 * @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 2.1.2
 */
public int getOrientation () {
	checkWidget();
	return style & (SWT.LEFT_TO_RIGHT | SWT.RIGHT_TO_LEFT);
}

/**
 * Gets the position of the selected text.
 * <p>
 * Indexing is zero based.  The range of
 * a selection is from 0..N where N is
 * the number of characters in the widget.
 * </p>
 * 
 * @return the start and end of the selection
 *
 * @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 Point getSelection () {
	checkWidget ();
	int [] start = new int [1], end = new int [1];
	OS.SendMessage (handle, OS.EM_GETSEL, start, end);
	if (OS.IsDBLocale) {
		start [0] = mbcsToWcsPos (start [0]);
		end [0] = mbcsToWcsPos (end [0]);
	}
	return new Point (start [0], end [0]);
}

/**
 * Gets the number of selected characters.
 *
 * @return the number of selected characters.
 *
 * @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 getSelectionCount () {
	checkWidget ();
	Point selection = getSelection ();
	return selection.y - selection.x;
}

/**
 * Gets the selected text.
 *
 * @return the selected text
 * 
 * @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 String getSelectionText () {
	checkWidget ();
	/*
	* NOTE: The current implementation uses substring ()
	* which can reference a potentially large character
	* array.
	*/
	Point selection = getSelection ();
	return getText ().substring (selection.x, selection.y);
}

/**
 * Gets the number of tabs.
 * <p>
 * Tab stop spacing is specified in terms of the