tabfolder.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

 * @return the index of the item
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string 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>
 */
public int indexOf (TabItem item) {
	checkWidget ();
	if (item == null) error (SWT.ERROR_NULL_ARGUMENT);
	int count = OS.SendMessage (handle, OS.TCM_GETITEMCOUNT, 0, 0);
	for (int i=0; i<count; i++) {
		if (items [i] == item) return i;
	}
	return -1;
}

Point minimumSize (int wHint, int hHint, boolean flushCache) {
	Control [] children = _getChildren ();
	int width = 0, height = 0;
	for (int i=0; i<children.length; i++) {
		Control child = children [i];
		int index = 0;	
		int count = OS.SendMessage (handle, OS.TCM_GETITEMCOUNT, 0, 0);
		while (index < count) {
			if (items [index].control == child) break;
			index++;
		}
		if (index == count) {
			Rectangle rect = child.getBounds ();
			width = Math.max (width, rect.x + rect.width);
			height = Math.max (height, rect.y + rect.height);
		} else {
			Point size = child.computeSize (wHint, hHint, flushCache);
			width = Math.max (width, size.x);
			height = Math.max (height, size.y);
		}
	}
	return new Point (width, height);
}

boolean mnemonicHit (char key) {
	for (int i=0; i<items.length; i++) {
		TabItem item = items [i];
		if (item != null) {
			char ch = findMnemonic (item.getText ());
			if (Character.toUpperCase (key) == Character.toUpperCase (ch)) {		
				if (setFocus ()) {
					setSelection (i, true);
					return true;
				}
			}
		}
	}
	return false;
}

boolean mnemonicMatch (char key) {
	for (int i=0; i<items.length; i++) {
		TabItem item = items [i];
		if (item != null) {
			char ch = findMnemonic (item.getText ());
			if (Character.toUpperCase (key) == Character.toUpperCase (ch)) {		
				return true;
			}
		}
	}
	return false;
}

void releaseWidget () {
	int count = OS.SendMessage (handle, OS.TCM_GETITEMCOUNT, 0, 0);
	for (int i=0; i<count; i++) {
		TabItem item = items [i];
		if (!item.isDisposed ()) item.releaseResources ();
	}
	items = null;
	if (imageList != null) {
		OS.SendMessage (handle, OS.TCM_SETIMAGELIST, 0, 0);
		display.releaseImageList (imageList);
	}
	imageList = null;
	super.releaseWidget ();
}

void removeControl (Control control) {
	super.removeControl (control);
	int count = OS.SendMessage (handle, OS.TCM_GETITEMCOUNT, 0, 0);
	for (int i=0; i<count; i++) {
		TabItem item = items [i];
		if (item.control == control) item.setControl (null);
	}
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when the receiver's selection changes.
 *
 * @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 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);	
}

/**
 * Sets the receiver's selection to be the given array of items.
 * The current selected is first cleared, then the new items are
 * selected.
 *
 * @param items the array of items
 *
 * @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 setSelection (TabItem [] items) {
	checkWidget ();
	if (items == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (items.length == 0) {
		setSelection (-1, false);
	} else {
		for (int i=items.length-1; i>=0; --i) {
			int index = indexOf (items [i]);
			if (index != -1) setSelection (index, false);
		}
	}
}

/**
 * Selects the item at the given zero-relative index in the receiver. 
 * If the item at the index was already selected, it remains selected.
 * The current selection is first cleared, then the new items are
 * selected. Indices that are out of range are ignored.
 *
 * @param index the index of the item to select
 *
 * @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 setSelection (int index) {
	checkWidget ();
	int count = OS.SendMessage (handle, OS.TCM_GETITEMCOUNT, 0, 0);
	if (!(0 <= index && index < count)) return;
	setSelection (index, false);
}

void setSelection (int index, boolean notify) {
	int oldIndex = OS.SendMessage (handle, OS.TCM_GETCURSEL, 0, 0);
	if (oldIndex != -1) {
		TabItem item = items [oldIndex];
		Control control = item.control;
		if (control != null && !control.isDisposed ()) {
			control.setVisible (false);
		}
	}
	OS.SendMessage (handle, OS.TCM_SETCURSEL, index, 0);
	int newIndex = OS.SendMessage (handle, OS.TCM_GETCURSEL, 0, 0);
	if (newIndex != -1) {
		TabItem item = items [newIndex];
		Control control = item.control;
		if (control != null && !control.isDisposed ()) {
			control.setBounds (getClientArea ());
			control.setVisible (true);
		}
		if (notify) {
			Event event = new Event ();
			event.item = item;
			sendEvent (SWT.Selection, event);
		}
	}
}

String toolTipText (NMTTDISPINFO hdr) {
	if ((hdr.uFlags & OS.TTF_IDISHWND) != 0) {
		return null;
	}
	int index = hdr.idFrom;
	int hwndToolTip = OS.SendMessage (handle, OS.TCM_GETTOOLTIPS, 0, 0);
	if (hwndToolTip == hdr.hwndFrom) {
		if (toolTipText != null) return "";
		if (0 <= index && index < items.length) {
			TabItem item = items [index];
			if (item != null) return item.toolTipText;
		}
	}
	return super.toolTipText (hdr);
}

boolean traversePage (boolean next) {
	int count = getItemCount ();
	if (count == 0) return false;
	int index = getSelectionIndex ();
	if (index == -1) {
		index = 0;
	} else {
		int offset = (next) ? 1 : -1;
		index = (index + offset + count) % count;
	}
	setSelection (index, true);
	return index == getSelectionIndex ();
}

int widgetStyle () {
	/*
	* Bug in Windows.  Under certain circumstances,
	* when TCM_SETITEM is used to change the text
	* in a tab item, the tab folder draws on top
	* of the client area.  The fix is ensure that
	* this cannot happen by setting WS_CLIPCHILDREN.
	*/
	int bits = super.widgetStyle () | OS.WS_CLIPCHILDREN;
	if ((style & SWT.NO_FOCUS) != 0) bits |= OS.TCS_FOCUSNEVER;
	if ((style & SWT.BOTTOM) != 0) bits |= OS.TCS_BOTTOM;
	return bits | OS.TCS_TABS | OS.TCS_TOOLTIPS;
}

TCHAR windowClass () {
	return TabFolderClass;
}

int windowProc () {
	return TabFolderProc;
}

LRESULT WM_GETDLGCODE (int wParam, int lParam) {
	LRESULT result = super.WM_GETDLGCODE (wParam, lParam);
	/*
	* Return DLGC_BUTTON so that mnemonics will be
	* processed without needing to press the ALT key
	* when the widget has focus.
	*/
	if (result != null) return result;
	return new LRESULT (OS.DLGC_BUTTON);
}

LRESULT WM_NCHITTEST (int wParam, int lParam) {
	LRESULT result = super.WM_NCHITTEST (wParam, lParam);
	if (result != null) return result;
	/*
	* Feature in Windows.  The tab control implements
	* WM_NCHITTEST to return HTCLIENT when the cursor
	* is inside the tab buttons.  This causes mouse
	* events like WM_MOUSEMOVE to be delivered to the
	* parent.  Also, tool tips for the tab control are
	* never invoked because tool tips rely on mouse
	* events to be delivered to the window that wants
	* to display the tool tip.  The fix is to call the
	* default window proc that returns HTCLIENT when
	* the mouse is in the client area.	
	*/
	int hittest = OS.DefWindowProc (handle, OS.WM_NCHITTEST, wParam, lParam);
	return new LRESULT (hittest);
}

LRESULT WM_NOTIFY (int wParam, int lParam) {
	/*
	* Feature in Windows.  When the tab folder window
	* proc processes WM_NOTIFY, it forwards this
	* message to its parent.  This is done so that
	* children of this control that send this message 
	* type to their parent will notify not only
	* this control but also the parent of this control,
	* which is typically the application window and
	* the window that is looking for the message.
	* If the control did not forward the message, 
	* applications would have to subclass the control 
	* window to see the message. Because the control
	* window is subclassed by SWT, the message
	* is delivered twice, once by SWT and once when
	* the message is forwarded by the window proc.
	* The fix is to avoid calling the window proc 
	* for this control.
	*/
	LRESULT result = super.WM_NOTIFY (wParam, lParam);
	if (result != null) return result;
	return LRESULT.ZERO;
}

LRESULT WM_PARENTNOTIFY (int wParam, int lParam) {
	LRESULT result = super.WM_PARENTNOTIFY (wParam, lParam);
	if (result != null) return result;
	/*
	* Feature in Windows.  Windows does not explicitly set the orientation of
	* the buddy control.  Instead, the orientation is inherited when WS_EX_LAYOUTRTL
	* is specified for the tab folder.  This means that when both WS_EX_LAYOUTRTL
	* and WS_EX_NOINHERITLAYOUT are specified for the tab folder, the buddy control
	* will not be oriented correctly.  The fix is to explicitly set the orientation
	* for the buddy control.
	* 
	* NOTE: WS_EX_LAYOUTRTL is not supported on Windows NT.
	*/
	if ((OS.WIN32_MAJOR << 16 | OS.WIN32_MINOR)	< (4 << 16 | 10)) return result;
	if ((style & SWT.RIGHT_TO_LEFT) != 0) {
		int code = wParam & 0xFFFF;
		switch (code) {
			case OS.WM_CREATE: {
				int id = (wParam >> 16), hwnd = lParam;
				if (id == ID_UPDOWN) {
					int bits = OS.GetWindowLong (hwnd, OS.GWL_EXSTYLE);
					OS.SetWindowLong (hwnd, OS.GWL_EXSTYLE,	bits | OS.WS_EX_LAYOUTRTL);
				}
				break;
			}
		}
	}
	return result;
}

LRESULT WM_SIZE (int wParam, int lParam) {
	LRESULT result = super.WM_SIZE (wParam, lParam);
	/*
	* It is possible (but unlikely), that application
	* code could have disposed the widget in the resize
	* event.  If this happens, end the processing of the
	* Windows message by returning the result of the
	* WM_SIZE message.
	*/
	if (isDisposed ()) return result;
	int index = OS.SendMessage (handle, OS.TCM_GETCURSEL, 0, 0);
	if (index != -1) {
		TabItem item = items [index];
		Control control = item.control;
		if (control != null && !control.isDisposed ()) {
			control.setBounds (getClientArea ());
		}
	}
	return result;
}

LRESULT WM_WINDOWPOSCHANGING (int wParam, int lParam) {
	LRESULT result = super.WM_WINDOWPOSCHANGING (wParam, lParam);
	if (result != null) return result;
	if (!OS.IsWindowVisible (handle)) return result;
	WINDOWPOS lpwp = new WINDOWPOS ();
	OS.MoveMemory (lpwp, lParam, WINDOWPOS.sizeof);
	if ((lpwp.flags & (OS.SWP_NOSIZE | OS.SWP_NOREDRAW)) != 0) {
		return result;
	}
	int bits = OS.GetWindowLong (handle, OS.GWL_STYLE);
	if ((bits & OS.TCS_MULTILINE) != 0) {
		OS.InvalidateRect (handle, null, true);
		return result;
	}
	RECT rect = new RECT ();
	OS.SetRect (rect, 0, 0, lpwp.cx, lpwp.cy);
	OS.SendMessage (handle, OS.WM_NCCALCSIZE, 0, rect);
	int newWidth = rect.right - rect.left;
	int newHeight = rect.bottom - rect.top;
	OS.GetClientRect (handle, rect);
	int oldWidth = rect.right - rect.left;
	int oldHeight = rect.bottom - rect.top;
	if (newWidth == oldWidth && newHeight == oldHeight) {
		return result;
	}
	RECT inset = new RECT ();
	OS.SendMessage (handle, OS.TCM_ADJUSTRECT, 0, inset);
	int marginX = -inset.right, marginY = -inset.bottom;
	if (newWidth != oldWidth) {
		int left = oldWidth;
		if (newWidth < oldWidth) left = newWidth;
		OS.SetRect (rect, left - marginX, 0, newWidth, newHeight);
		OS.InvalidateRect (handle, rect, true);
	}
	if (newHeight != oldHeight) {
		int bottom = oldHeight;
		if (newHeight < oldHeight) bottom = newHeight;
		if (newWidth < oldWidth) oldWidth -= marginX;
		OS.SetRect (rect, 0, bottom - marginY, oldWidth, newHeight);
		OS.InvalidateRect (handle, rect, true);
	}
	return result;
}

LRESULT wmNotifyChild (int wParam, int lParam) {
	NMHDR hdr = new NMHDR ();
	OS.MoveMemory (hdr, lParam, NMHDR.sizeof);
	int code = hdr.code;
	switch (code) {
		case OS.TCN_SELCHANGE: 
		case OS.TCN_SELCHANGING:
			TabItem item = null;
			int index = OS.SendMessage (handle, OS.TCM_GETCURSEL, 0, 0);
			if (index != -1) item = items [index];
			if (item != null) {
				Control control = item.control;
				if (control != null && !control.isDisposed ()) {
					if (code == OS.TCN_SELCHANGE) {
						control.setBounds (getClientArea ());
					}
					control.setVisible (code == OS.TCN_SELCHANGE);
				}
			}
			if (code == OS.TCN_SELCHANGE) {
				Event event = new Event ();
				event.item = item;
				postEvent (SWT.Selection, event);
			}
	}
	return super.wmNotifyChild (wParam, lParam);
}

}