tablecolumn.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

	checkWidget ();
	int index = parent.indexOf (this);
	if (index == -1) return 0;
	int hwnd = parent.handle;
	return OS.SendMessage (hwnd, OS.LVM_GETCOLUMNWIDTH, index, 0);
}

/**
 * Causes the receiver to be resized to its preferred size.
 * For a composite, this involves computing the preferred size
 * from its layout, if there is one.
 *
 * @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 pack () {
	checkWidget ();
	int index = parent.indexOf (this);
	if (index == -1) return;
	int hwnd = parent.handle;
	TCHAR buffer = new TCHAR (parent.getCodePage (), text, true);
	int headerWidth = OS.SendMessage (hwnd, OS.LVM_GETSTRINGWIDTH, 0, buffer) + 10;
	if (image != null) {
		int margin = 0;
		if ((OS.COMCTL32_MAJOR << 16 | OS.COMCTL32_MINOR) >= (5 << 16 | 80)) {
			int hwndHeader = OS.SendMessage (hwnd, OS.LVM_GETHEADER, 0, 0);
			margin = OS.SendMessage (hwndHeader, OS.HDM_GETBITMAPMARGIN, 0, 0);
		} else {
			margin = OS.GetSystemMetrics (OS.SM_CXEDGE) * 3;
		}
		Rectangle rect = image.getBounds ();
		headerWidth += rect.width + margin * 2;
	}
	if ((parent.style & SWT.VIRTUAL) != 0) {
		if (image == null) {
			OS.SendMessage (hwnd, OS.LVM_SETCOLUMNWIDTH, index, OS.LVSCW_AUTOSIZE_USEHEADER);
		} else {
			OS.SendMessage (hwnd, OS.LVM_SETCOLUMNWIDTH, index, headerWidth);
		}		
	} else {
		OS.SendMessage (hwnd, OS.LVM_SETCOLUMNWIDTH, index, OS.LVSCW_AUTOSIZE);
		int columnWidth = OS.SendMessage (hwnd, OS.LVM_GETCOLUMNWIDTH, index, 0);
		/*
		* Bug in Windows.  When LVM_SETCOLUMNWIDTH is used with LVSCW_AUTOSIZE
		* where each item has I_IMAGECALLBACK but there are no images in the
		* table, the size computed by LVM_SETCOLUMNWIDTH is to small for the
		* first column, causing long items to be clipped with '...'.  The fix
		* is to increase the value by a small amount. 
		*/
		if (index == 0 && parent.imageList == null) columnWidth += 2;
		if (headerWidth > columnWidth) {
			if (image == null) {
				OS.SendMessage (hwnd, OS.LVM_SETCOLUMNWIDTH, index, OS.LVSCW_AUTOSIZE_USEHEADER);
			} else {
				OS.SendMessage (hwnd, OS.LVM_SETCOLUMNWIDTH, index, headerWidth);
			}
		} else {
			if (index == 0) {
				OS.SendMessage (hwnd, OS.LVM_SETCOLUMNWIDTH, index, columnWidth);
			}
		}
	}
}

void releaseChild () {
	super.releaseChild ();
	parent.destroyItem (this);
}

void releaseWidget () {
	super.releaseWidget ();
	parent = 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 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.Move, listener);
	eventTable.unhook (SWT.Resize, listener);
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the control is selected.
 *
 * @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 SelectionListener
 * @see #addSelectionListener
 */
public void removeSelectionListener(SelectionListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Selection, listener);
	eventTable.unhook (SWT.DefaultSelection,listener);	
}

/**
 * Controls how text and images will be displayed in the receiver.
 * The argument should be one of <code>LEFT</code>, <code>RIGHT</code>
 * or <code>CENTER</code>.
 *
 * @param alignment the new alignment 
 *
 * @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 setAlignment (int alignment) {
	checkWidget ();
	if ((alignment & (SWT.LEFT | SWT.RIGHT | SWT.CENTER)) == 0) return;
	int index = parent.indexOf (this);
	if (index == -1 || index == 0) return;
	style &= ~(SWT.LEFT | SWT.RIGHT | SWT.CENTER);
	style |= alignment & (SWT.LEFT | SWT.RIGHT | SWT.CENTER);
	int hwnd = parent.handle;
	LVCOLUMN lvColumn = new LVCOLUMN ();
	lvColumn.mask = OS.LVCF_FMT | OS.LVCF_IMAGE;
	OS.SendMessage (hwnd, OS.LVM_GETCOLUMN, index, lvColumn);
	lvColumn.fmt &= ~OS.LVCFMT_JUSTIFYMASK;
	int fmt = 0;
	if ((style & SWT.LEFT) == SWT.LEFT) fmt = OS.LVCFMT_LEFT;
	if ((style & SWT.CENTER) == SWT.CENTER) fmt = OS.LVCFMT_CENTER;
	if ((style & SWT.RIGHT) == SWT.RIGHT) fmt = OS.LVCFMT_RIGHT;
	lvColumn.fmt |= fmt;
	OS.SendMessage (hwnd, OS.LVM_SETCOLUMN, index, lvColumn);
}

public void setImage (Image image) {
	checkWidget();
	if (image != null && image.isDisposed ()) {
		error (SWT.ERROR_INVALID_ARGUMENT);
	}
	int index = parent.indexOf (this);
	if (index == -1) return;
	super.setImage (image);
	int hwnd = parent.handle;
	LVCOLUMN lvColumn = new LVCOLUMN ();
	lvColumn.mask = OS.LVCF_FMT | OS.LVCF_IMAGE;
	OS.SendMessage (hwnd, OS.LVM_GETCOLUMN, index, lvColumn);
	if (image != null) {
		lvColumn.fmt |= OS.LVCFMT_IMAGE;
		lvColumn.iImage = parent.imageIndex (image);
	} else {
		lvColumn.fmt &= ~OS.LVCFMT_IMAGE;
	}
	OS.SendMessage (hwnd, OS.LVM_SETCOLUMN, index, lvColumn);
}

/**
 * Sets the resizable attribute.  A column that is
 * not resizable cannot be dragged by the user but
 * may be resized by the programmer.
 *
 * @param resizable the resize attribute
 *
 * @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 setResizable (boolean resizable) {
	checkWidget ();
	this.resizable = resizable;
}

public void setText (String string) {
	checkWidget ();
	if (string == null) error (SWT.ERROR_NULL_ARGUMENT);
	int index = parent.indexOf (this);
	if (index == -1) return;
	super.setText (string);

	/*
	* Bug in Windows.  For some reason, when the title
	* of a column is changed after the column has been
	* created, the alignment must also be reset or the
	* text does not draw.  The fix is to query and then
	* set the alignment.
	*/
	int hwnd = parent.handle;
	LVCOLUMN lvColumn = new LVCOLUMN ();
	lvColumn.mask = OS.LVCF_FMT;
	OS.SendMessage (hwnd, OS.LVM_GETCOLUMN, index, lvColumn);

	/* Set the column title */
	int hHeap = OS.GetProcessHeap ();
	TCHAR buffer = new TCHAR (parent.getCodePage (), string, true);
	int byteCount = buffer.length () * TCHAR.sizeof;
	int pszText = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, byteCount);
	OS.MoveMemory (pszText, buffer, byteCount);
	lvColumn.mask |= OS.LVCF_TEXT;
	lvColumn.pszText = pszText;
	int result = OS.SendMessage (hwnd, OS.LVM_SETCOLUMN, index, lvColumn);
	if (pszText != 0) OS.HeapFree (hHeap, 0, pszText);
	if (result == 0) error (SWT.ERROR_CANNOT_SET_TEXT);
}

/**
 * Sets the width of the receiver.
 *
 * @param width the new width
 *
 * @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 setWidth (int width) {
	checkWidget ();
	int index = parent.indexOf (this);
	if (index == -1) return;
	int hwnd = parent.handle;
	OS.SendMessage (hwnd, OS.LVM_SETCOLUMNWIDTH, index, width);
}

}