tree.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

	* 
	* NOTE: This only happens on Windows XP.
	*/
	customDraw = false;
	items = null;
	if (imageList != null) {
		OS.SendMessage (handle, OS.TVM_SETIMAGELIST, OS.TVSIL_NORMAL, 0);
		display.releaseImageList (imageList);
	} else {
		int hOldList = OS.SendMessage (handle, OS.TVM_GETIMAGELIST, OS.TVSIL_NORMAL, 0);
		OS.SendMessage (handle, OS.TVM_SETIMAGELIST, OS.TVSIL_NORMAL, 0);
		if (hOldList != 0) OS.ImageList_Destroy (hOldList);
	}
	imageList = null;
	int hOldList = OS.SendMessage (handle, OS.TVM_GETIMAGELIST, OS.TVSIL_STATE, 0);
	OS.SendMessage (handle, OS.TVM_SETIMAGELIST, OS.TVSIL_STATE, 0);
	if (hOldList != 0) OS.ImageList_Destroy (hOldList);
	super.releaseWidget ();
}


/**
 * Removes all of the items from the receiver.
 * <p>
 * @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 removeAll () {
	checkWidget ();
	ignoreDeselect = ignoreSelect = true;
	boolean redraw = drawCount == 0 && OS.IsWindowVisible (handle);
	if (redraw) {
		OS.DefWindowProc (handle, OS.WM_SETREDRAW, 0, 0);
		/*
		* This code is intentionally commented.
		*/
//		OS.SendMessage (handle, OS.WM_SETREDRAW, 0, 0);
	}
	int result = OS.SendMessage (handle, OS.TVM_DELETEITEM, 0, OS.TVI_ROOT);
	if (redraw) {
		OS.DefWindowProc (handle, OS.WM_SETREDRAW, 1, 0);	
		/*
		* This code is intentionally commented.
		*/
//		OS.SendMessage (handle, OS.WM_SETREDRAW, 1, 0);
		OS.InvalidateRect (handle, null, true);
	}
	ignoreDeselect = ignoreSelect = false;
	if (result == 0) error (SWT.ERROR_ITEM_NOT_REMOVED);
	for (int i=0; i<items.length; i++) {
		TreeItem item = items [i];
		if (item != null && !item.isDisposed ()) {
			item.releaseResources ();
		}
	}
	if (imageList != null) {
		OS.SendMessage (handle, OS.TVM_SETIMAGELIST, 0, 0);
		display.releaseImageList (imageList);
	}
	imageList = null;
	customDraw = false;
	items = new TreeItem [4];
	hAnchor = 0;
}

/**
 * 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);
	eventTable.unhook (SWT.Selection, listener);
	eventTable.unhook (SWT.DefaultSelection, listener);	
}

/**
 * Removes the listener from the collection of listeners who will
 * be notified when items in the receiver are expanded or collapsed..
 *
 * @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 TreeListener
 * @see #addTreeListener
 */
public void removeTreeListener(TreeListener listener) {
	checkWidget ();
	if (listener == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Expand, listener);
	eventTable.unhook (SWT.Collapse, listener);
}

/**
 * Display a mark indicating the point at which an item will be inserted.
 * The drop insert item has a visual hint to show where a dragged item 
 * will be inserted when dropped on the tree.
 * 
 * @param item the insert item.  Null will clear the insertion mark.
 * @param before true places the insert mark above 'item'. false places 
 *	the insert mark below 'item'.
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the item has been disposed</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 void setInsertMark (TreeItem item, boolean before) {
	checkWidget ();
	int hItem = 0;
	if (item != null) {
		if (item.isDisposed()) error(SWT.ERROR_INVALID_ARGUMENT);
		hItem = item.handle;
	}
	OS.SendMessage (handle, OS.TVM_SETINSERTMARK, (before) ? 0 : 1, hItem);
}

/**
 * Selects all of the items in the receiver.
 * <p>
 * If the receiver is single-select, do nothing.
 *
 * @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 selectAll () {
	checkWidget ();
	if ((style & SWT.SINGLE) != 0) return;
	TVITEM tvItem = new TVITEM ();
	tvItem.mask = OS.TVIF_STATE;
	tvItem.state = OS.TVIS_SELECTED;
	tvItem.stateMask = OS.TVIS_SELECTED;
	int oldProc = OS.GetWindowLong (handle, OS.GWL_WNDPROC);
	OS.SetWindowLong (handle, OS.GWL_WNDPROC, TreeProc);	
	for (int i=0; i<items.length; i++) {
		TreeItem item = items [i];
		if (item != null) {
			tvItem.hItem = item.handle;
			OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
		}
	}
	OS.SetWindowLong (handle, OS.GWL_WNDPROC, oldProc);
}

void setBackgroundPixel (int pixel) {
	if (background == pixel) return;
	background = pixel;
	/*
	* Bug in Windows.  When TVM_GETBKCOLOR is used more
	* than once to set the background color of a tree,
	* the background color of the lines and the plus/minus
	* does not change to the new color.  The fix is to set
	* the background color to the default before setting
	* the new color.
	*/
	int oldPixel = OS.SendMessage (handle, OS.TVM_GETBKCOLOR, 0, 0);
	if (oldPixel != -1) OS.SendMessage (handle, OS.TVM_SETBKCOLOR, 0, -1);
	OS.SendMessage (handle, OS.TVM_SETBKCOLOR, 0, pixel);
	if ((style & SWT.CHECK) != 0) setCheckboxImageList ();
}

void setBounds (int x, int y, int width, int height, int flags) {
	/*
	* Ensure that the selection is visible when the tree is resized
	* from a zero size to a size that can show the selection.
	*/
	boolean fixSelection = false;
	if ((flags & OS.SWP_NOSIZE) == 0 && (width != 0 || height != 0)) {
		if (OS.SendMessage (handle, OS.TVM_GETVISIBLECOUNT, 0, 0) == 0) {
			fixSelection = true;
		}
	}
	super.setBounds (x, y, width, height, flags);
	if (fixSelection) {
		int hItem = OS.SendMessage (handle, OS.TVM_GETNEXTITEM, OS.TVGN_CARET, 0);
		if (hItem != 0) showItem (hItem);
	}
}

void setCursor () {
	/*
	* Bug in Windows.  Under certain circumstances, when WM_SETCURSOR
	* is sent using SendMessage(), Windows GP's in the window proc for
	* the tree.  The fix is to avoid calling the tree window proc and
	* set the cursor for the tree outside of WM_SETCURSOR.
	* 
	* NOTE:  This code assumes that the default cursor for the tree
	* is IDC_ARROW.
	*/
	Cursor cursor = findCursor ();
	int hCursor = cursor == null ? OS.LoadCursor (0, OS.IDC_ARROW) : cursor.handle;
	OS.SetCursor (hCursor);
}

void setCheckboxImageList () {
	if ((style & SWT.CHECK) == 0) return;
	int count = 5;
	int height = OS.SendMessage (handle, OS.TVM_GETITEMHEIGHT, 0, 0), width = height;
	int hImageList = OS.ImageList_Create (width, height, OS.ILC_COLOR, count, count);
	int hDC = OS.GetDC (handle);
	if (!OS.IsWinCE && (OS.WIN32_MAJOR << 16 | OS.WIN32_MINOR) >= (4 << 16 | 10)) {
		OS.SetLayout (hDC, 0);
	}
	int memDC = OS.CreateCompatibleDC (hDC);
	int hBitmap = OS.CreateCompatibleBitmap (hDC, width * count, height);
	int hOldBitmap = OS.SelectObject (memDC, hBitmap);
	RECT rect = new RECT ();
	OS.SetRect (rect, 0, 0, width * count, height);
	int hBrush = OS.CreateSolidBrush (getBackgroundPixel ());
	OS.FillRect (memDC, rect, hBrush);
	OS.DeleteObject (hBrush);
	int oldFont = OS.SelectObject (hDC, defaultFont ());
	TEXTMETRIC tm = OS.IsUnicode ? (TEXTMETRIC) new TEXTMETRICW () : new TEXTMETRICA ();
	OS.GetTextMetrics (hDC, tm);
	OS.SelectObject (hDC, oldFont);
	int itemWidth = Math.min (tm.tmHeight, width);
	int itemHeight = Math.min (tm.tmHeight, height);
	int left = (width - itemWidth) / 2, top = (height - itemHeight) / 2 + 1;
	OS.SetRect (rect, left + width, top, left + width + itemWidth, top + itemHeight);
	OS.DrawFrameControl (memDC, rect, OS.DFC_BUTTON, OS.DFCS_BUTTONCHECK | OS.DFCS_FLAT);
	rect.left += width;  rect.right += width;
	OS.DrawFrameControl (memDC, rect, OS.DFC_BUTTON, OS.DFCS_BUTTONCHECK | OS.DFCS_CHECKED | OS.DFCS_FLAT);
	rect.left += width;  rect.right += width;
	OS.DrawFrameControl (memDC, rect, OS.DFC_BUTTON, OS.DFCS_BUTTONCHECK | OS.DFCS_INACTIVE | OS.DFCS_FLAT);
	rect.left += width;  rect.right += width;
	OS.DrawFrameControl (memDC, rect, OS.DFC_BUTTON, OS.DFCS_BUTTONCHECK | OS.DFCS_CHECKED | OS.DFCS_INACTIVE | OS.DFCS_FLAT);
	OS.SelectObject (memDC, hOldBitmap);
	OS.DeleteDC (memDC);
	OS.ReleaseDC (handle, hDC);
	OS.ImageList_AddMasked (hImageList, hBitmap, 0);
	OS.DeleteObject (hBitmap);
	int hOldList = OS.SendMessage (handle, OS.TVM_GETIMAGELIST, OS.TVSIL_STATE, 0);
	OS.SendMessage (handle, OS.TVM_SETIMAGELIST, OS.TVSIL_STATE, hImageList);
	if (hOldList != 0) OS.ImageList_Destroy (hOldList);
}

void setForegroundPixel (int pixel) {
	if (foreground == pixel) return;
	foreground = pixel;
	OS.SendMessage (handle, OS.TVM_SETTEXTCOLOR, 0, pixel);
}

public void setRedraw (boolean redraw) {
	checkWidget ();
	/*
	* Bug in Windows.  For some reason, when WM_SETREDRAW
	* is used to turn redraw on for a tree and the tree
	* contains no items, the last item in the tree does
	* not redraw properly.  If the tree has only one item,
	* that item is not drawn.  If another window is dragged
	* on top of the item, parts of the item are redrawn
	* and erased at random.  The fix is to ensure that this
	* case doesn't happen by inserting and deleting an item
	* when redraw is turned on and there are no items in
	* the tree.
	*/
	int hItem = 0;
	if (redraw && drawCount == 1) {
		int count = OS.SendMessage (handle, OS.TVM_GETCOUNT, 0, 0);
		if (count == 0) {
			TVINSERTSTRUCT tvInsert = new TVINSERTSTRUCT ();
			tvInsert.hInsertAfter = OS.TVI_FIRST;
			hItem = OS.SendMessage (handle, OS.TVM_INSERTITEM, 0, tvInsert);
		}
	}
	super.setRedraw (redraw);
	if (hItem != 0) {
		OS.SendMessage (handle, OS.TVM_DELETEITEM, 0, hItem);
	}
}

/**
 * Sets the receiver's selection to be the given array of items.
 * The current selection is cleared before the new items are selected.
 * <p>
 * Items that are not in the receiver are ignored.
 * If the receiver is single-select and multiple items are specified,
 * then all items are ignored.
 *
 * @param items the array of items
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the array of items is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if one of the items has been disposed</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 Tree#deselectAll()
 */
public void setSelection (TreeItem [] items) {
	checkWidget ();
	if (items == null) error (SWT.ERROR_NULL_ARGUMENT);
	int length = items.length;
	if (length == 0 || ((style & SWT.SINGLE) != 0 && length > 1)) {
		deselectAll();
		return;
	}
		
	/* Select/deselect the first item */
	TreeItem item = items [0];
	if (item != null) {
		if (item.isDisposed ()) error (SWT.ERROR_INVALID_ARGUMENT);
		int hOldItem = OS.SendMessage (handle, OS.TVM_GETNEXTITEM, OS.TVGN_CARET, 0);
		int hNewItem = hAnchor = item.handle;
		
		/*
		* Bug in Windows.  When TVM_SELECTITEM is used to select and
		* scroll an item to be visible and the client area of the tree
		* is smaller that the size of one item, TVM_SELECTITEM makes
		* the next item in the tree visible by making it the top item
		* instead of making the desired item visible.  The fix is to
		* detect the case when the client area is too small and make
		* the desired visible item be the top item in the tree.
		* 
		* Note that TVM_SELECTITEM when called with TVGN_FIRSTVISIBLE
		* also requires the work around for scrolling.
		*/
		boolean fixScroll = checkScroll (hNewItem);
		if (fixScroll) {
			OS.SendMessage (handle, OS.WM_SETREDRAW, 1, 0);
			OS.DefWindowProc (handle, OS.WM_SETREDRAW, 0, 0);
		}
		ignoreSelect = true;
		OS.SendMessage (handle, OS.TVM_SELECTITEM, OS.TVGN_CARET, hNewItem);
		ignoreSelect = false;
		if (OS.SendMessage (handle, OS.TVM_GETVISIBLECOUNT, 0, 0) == 0) {
			OS.SendMessage (handle, OS.TVM_SELECTITEM, OS.TVGN_FIRSTVISIBLE, hNewItem);
		}
		if (fixScroll) {
			OS.DefWindowProc (handle, OS.WM_SETREDRAW, 1, 0);
			OS.SendMessage (handle, OS.WM_SETREDRAW, 0, 0);
		}
		
		/*
		* Feature in Windows.  When the old and new focused item
		* are the same, Windows does not check to make sure that
		* the item is actually selected, not just focused.  The
		* fix is to force the item to draw selected by setting
		* the state mask, and to ensure that it is visible.
		*/
		if (hOldItem == hNewItem) {
			TVITEM tvItem = new TVITEM ();
			tvItem.mask = OS.TVIF_STATE;
			tvItem.state = OS.TVIS_SELECTED;
			tvItem.stateMask = OS.TVIS_SELECTED;
			tvItem.hItem = hNewItem;
			OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
			showItem (hNewItem);
		}
	}
	if ((style & SWT.SINGLE) != 0) return;