tree.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

	/* Select/deselect the rest of the items */
	TVITEM tvItem = new TVITEM ();
	tvItem.mask = OS.TVIF_STATE;
	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<this.items.length; i++) {
		item = this.items [i];
		if (item != null) {
			int index = 0;
			while (index < length) {
				if (items [index] == item) break;
				index++;
			}
			tvItem.hItem = item.handle;
			OS.SendMessage (handle, OS.TVM_GETITEM, 0, tvItem);
			if ((tvItem.state & OS.TVIS_SELECTED) != 0) {
				if (index == length) {
					tvItem.state = 0;
					OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
				}
			} else {
				if (index != length) {
					tvItem.state = OS.TVIS_SELECTED;
					OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
				}
			}
		}
	}
	OS.SetWindowLong (handle, OS.GWL_WNDPROC, oldProc);
}

/**
 * Sets the item which is currently at the top of the receiver.
 * This item can change when items are expanded, collapsed, scrolled
 * or new items are added or removed.
 *
 * @param item the item to be shown
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
 *    <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>
 *
 * @see Tree#getTopItem()
 * 
 * @since 2.1
 */
public void setTopItem (TreeItem item) {
	checkWidget ();
	if (item == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	if (item.isDisposed ()) SWT.error (SWT.ERROR_INVALID_ARGUMENT);
	int hItem = item.handle;
	boolean fixScroll = checkScroll (hItem);
	if (fixScroll) {
		OS.SendMessage (handle, OS.WM_SETREDRAW, 1, 0);
		OS.DefWindowProc (handle, OS.WM_SETREDRAW, 0, 0);
	}
	OS.SendMessage (handle, OS.TVM_SELECTITEM, OS.TVGN_FIRSTVISIBLE, hItem);
	if (fixScroll) {
		OS.DefWindowProc (handle, OS.WM_SETREDRAW, 1, 0);
		OS.SendMessage (handle, OS.WM_SETREDRAW, 0, 0);
	}
}

void showItem (int hItem) {
	/*
	* Bug in Windows.  When TVM_ENSUREVISIBLE is used to ensure
	* that an item is visible and the client area of the tree is
	* smaller that the size of one item, TVM_ENSUREVISIBLE 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.
	*/
	if (OS.SendMessage (handle, OS.TVM_GETVISIBLECOUNT, 0, 0) == 0) {
		boolean fixScroll = checkScroll (hItem);
		if (fixScroll) {
			OS.SendMessage (handle, OS.WM_SETREDRAW, 1, 0);
			OS.DefWindowProc (handle, OS.WM_SETREDRAW, 0, 0);
		}
		OS.SendMessage (handle, OS.TVM_SELECTITEM, OS.TVGN_FIRSTVISIBLE, hItem);
		OS.SendMessage (handle, OS.WM_HSCROLL, OS.SB_TOP, 0);
		if (fixScroll) {
			OS.DefWindowProc (handle, OS.WM_SETREDRAW, 1, 0);
			OS.SendMessage (handle, OS.WM_SETREDRAW, 0, 0);
		}
	} else {
		boolean scroll = true;
		RECT itemRect = new RECT ();
		itemRect.left = hItem;
		if (OS.SendMessage (handle, OS.TVM_GETITEMRECT, 1, itemRect) != 0) {
			forceResize ();
			RECT rect = new RECT ();
			OS.GetClientRect (handle, rect);
			POINT pt = new POINT ();
			pt.x = itemRect.left;
			pt.y = itemRect.top;
			if (OS.PtInRect (rect, pt)) {
				pt.y = itemRect.bottom;
				if (OS.PtInRect (rect, pt)) scroll = false;
			}
		}
		if (scroll) {
			boolean fixScroll = checkScroll (hItem);
			if (fixScroll) {
				OS.SendMessage (handle, OS.WM_SETREDRAW, 1, 0);
				OS.DefWindowProc (handle, OS.WM_SETREDRAW, 0, 0);
			}
			OS.SendMessage (handle, OS.TVM_ENSUREVISIBLE, 0, hItem);
			if (fixScroll) {
				OS.DefWindowProc (handle, OS.WM_SETREDRAW, 1, 0);
				OS.SendMessage (handle, OS.WM_SETREDRAW, 0, 0);
			}
		}
	}
}

/**
 * Shows the item.  If the item is already showing in the receiver,
 * this method simply returns.  Otherwise, the items are scrolled
 * and expanded until the item is visible.
 *
 * @param item the item to be shown
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the item is null</li>
 *    <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>
 *
 * @see Tree#showSelection()
 */
public void showItem (TreeItem item) {
	checkWidget ();
	if (item == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (item.isDisposed ()) error(SWT.ERROR_INVALID_ARGUMENT);
	showItem (item.handle);
}

/**
 * Shows the selection.  If the selection is already showing in the receiver,
 * this method simply returns.  Otherwise, the items are scrolled until
 * the selection is visible.
 *
 * @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#showItem(TreeItem)
 */
public void showSelection () {
	checkWidget ();
	int hItem = 0;
	if ((style & SWT.SINGLE) != 0) {	
		hItem = OS.SendMessage (handle, OS.TVM_GETNEXTITEM, OS.TVGN_CARET, 0);
		if (hItem == 0) return;
		TVITEM tvItem = new TVITEM ();
		tvItem.mask = OS.TVIF_STATE;
		tvItem.hItem = hItem;
		OS.SendMessage (handle, OS.TVM_GETITEM, 0, tvItem);
		if ((tvItem.state & OS.TVIS_SELECTED) == 0) return;
	} else {
		TVITEM tvItem = new TVITEM ();
		tvItem.mask = OS.TVIF_STATE;
		int oldProc = OS.GetWindowLong (handle, OS.GWL_WNDPROC);
		OS.SetWindowLong (handle, OS.GWL_WNDPROC, TreeProc);
		int index = 0;
		while (index <items.length) {
			TreeItem item = items [index];
			if (item != null) {
				tvItem.hItem = item.handle;
				OS.SendMessage (handle, OS.TVM_GETITEM, 0, tvItem);
				if ((tvItem.state & OS.TVIS_SELECTED) != 0) {
					hItem = tvItem.hItem;
					break;
				}
			}
			index++;
		}
		OS.SetWindowLong (handle, OS.GWL_WNDPROC, oldProc);
	}
	if (hItem != 0) showItem (hItem);
}

String toolTipText (NMTTDISPINFO hdr) {
	int hwndToolTip = OS.SendMessage (handle, OS.TVM_GETTOOLTIPS, 0, 0);
	if (hwndToolTip == hdr.hwndFrom && toolTipText != null) return ""; //$NON-NLS-1$
	return super.toolTipText (hdr);
}

int widgetStyle () {
	int bits = super.widgetStyle () | OS.TVS_SHOWSELALWAYS;
	bits |= OS.TVS_LINESATROOT | OS.TVS_HASLINES | OS.TVS_HASBUTTONS;
	/*
	* This code is intentionally commented.  In future,
	* FULL_SELECTION may be implemented for trees.
	*/
//	if ((style & SWT.FULL_SELECTION) != 0) {
//		bits |= OS.TVS_FULLROWSELECT;
//	} else {
//		bits |= OS.TVS_HASLINES | OS.TVS_HASBUTTONS;
//	}
//	bits |= OS.TVS_NOTOOLTIPS;
	return bits;
}

TCHAR windowClass () {
	return TreeClass;
}

int windowProc () {
	return TreeProc;
}

LRESULT WM_CHAR (int wParam, int lParam) {
	LRESULT result = super.WM_CHAR (wParam, lParam);
	if (result != null) return result;
	/*
	* Feature in Windows.  The tree control beeps
	* in WM_CHAR when the search for the item that
	* matches the key stroke fails.  This is the
	* standard tree behavior but is unexpected when
	* the key that was typed was ESC, CR or SPACE.
	* The fix is to avoid calling the tree window
	* proc in these cases.
	*/
	switch (wParam) {
		case OS.VK_RETURN:
			/*
			* Feature in Windows.  Windows sends NM_RETURN from WM_KEYDOWN
			* instead of using WM_CHAR.  This means that application code
			* that expects to consume the key press and therefore avoid the
			* SWT.DefaultSelection event from WM_CHAR will fail.  The fix
			* is to implement SWT.DefaultSelection in WM_CHAR instead of
			* using NM_RETURN.
			*/
			Event event = new Event ();
			int hItem = OS.SendMessage (handle, OS.TVM_GETNEXTITEM, OS.TVGN_CARET, 0);
			if (hItem != 0) {
				TVITEM tvItem = new TVITEM ();
				tvItem.hItem = hItem;
				tvItem.mask = OS.TVIF_PARAM;
				OS.SendMessage (handle, OS.TVM_GETITEM, 0, tvItem);
				event.item = items [tvItem.lParam];
			}
			postEvent (SWT.DefaultSelection, event);
			//FALL THROUGH
		case OS.VK_ESCAPE:
		case OS.VK_SPACE: return LRESULT.ZERO;
	}
	return result;
}

LRESULT WM_GETOBJECT (int wParam, int lParam) {
	/*
	* Ensure that there is an accessible object created for this
	* control because support for checked item accessibility is
	* temporarily implemented in the accessibility package.
	*/
	if ((style & SWT.CHECK) != 0) {
		if (accessible == null) accessible = new_Accessible (this);
	}
	return super.WM_GETOBJECT (wParam, lParam);
}

LRESULT WM_KEYDOWN (int wParam, int lParam) {
	LRESULT result = super.WM_KEYDOWN (wParam, lParam);
	if (result != null) return result;
	switch (wParam) {
		case OS.VK_SPACE: {
			int hItem = OS.SendMessage (handle, OS.TVM_GETNEXTITEM, OS.TVGN_CARET, 0);
			if (hItem != 0) {
				hAnchor = hItem;
				OS.SendMessage (handle, OS.TVM_ENSUREVISIBLE, 0, hItem);
				TVITEM tvItem = new TVITEM ();
				tvItem.mask = OS.TVIF_STATE | OS.TVIF_PARAM;
				tvItem.hItem = hItem;
				if ((style & SWT.CHECK) != 0) {
					tvItem.stateMask = OS.TVIS_STATEIMAGEMASK;
					OS.SendMessage (handle, OS.TVM_GETITEM, 0, tvItem);
					int state = tvItem.state >> 12;
					if ((state & 0x1) != 0) {
						state++;
					} else  {
						--state;
					}
					tvItem.state = state << 12;
					OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
					if (!OS.IsWinCE) {
						int id = hItem;
						if (OS.COMCTL32_MAJOR >= 6) {
							id = OS.SendMessage (handle, OS.TVM_MAPHTREEITEMTOACCID, hItem, 0);
						}
						OS.NotifyWinEvent (OS.EVENT_OBJECT_FOCUS, handle, OS.OBJID_CLIENT, id);	
					}
				}
				tvItem.stateMask = OS.TVIS_SELECTED;
				OS.SendMessage (handle, OS.TVM_GETITEM, 0, tvItem);
				if ((style & SWT.MULTI) != 0 && OS.GetKeyState (OS.VK_CONTROL) < 0) {
					if ((tvItem.state & OS.TVIS_SELECTED) != 0) {
						tvItem.state &= ~OS.TVIS_SELECTED;
					} else {
						tvItem.state |= OS.TVIS_SELECTED;
					}
				} else {
					tvItem.state |= OS.TVIS_SELECTED;
				}
				OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
				Event event = new Event ();
				event.item = items [tvItem.lParam];
				postEvent (SWT.Selection, event);
				if ((style & SWT.CHECK) != 0) {
					event = new Event ();
					event.item = items [tvItem.lParam];
					event.detail = SWT.CHECK;
					postEvent (SWT.Selection, event);
				}
				return LRESULT.ZERO;
			}
			break;
		}
		case OS.VK_UP:
		case OS.VK_DOWN:
		case OS.VK_PRIOR:
		case OS.VK_NEXT:
		case OS.VK_HOME:
		case OS.VK_END: {
			if ((style & SWT.SINGLE) != 0) break;
			if (OS.GetKeyState (OS.VK_SHIFT) < 0) {
				int hItem = OS.SendMessage (handle, OS.TVM_GETNEXTITEM, OS.TVGN_CARET, 0);
				if (hItem != 0) {
					if (hAnchor == 0) hAnchor = hItem;
					ignoreSelect = ignoreDeselect = true;
					int code = callWindowProc (OS.WM_KEYDOWN, wParam, lParam);
					ignoreSelect = ignoreDeselect = false;
					int hNewItem = OS.SendMessage (handle, OS.TVM_GETNEXTITEM, OS.TVGN_CARET, 0);
					TVITEM tvItem = new TVITEM ();
					tvItem.mask = OS.TVIF_STATE;
					tvItem.stateMask = OS.TVIS_SELECTED;
					int hDeselectItem = hItem;					
					RECT rect1 = new RECT ();
					rect1.left = hAnchor;
					OS.SendMessage (handle, OS.TVM_GETITEMRECT, 1, rect1);
					RECT rect2 = rect2 = new RECT ();
					rect2.left = hDeselectItem;
					OS.SendMessage (handle, OS.TVM_GETITEMRECT, 1, rect2);
					int flags = rect1.top < rect2.top ? OS.TVGN_PREVIOUSVISIBLE : OS.TVGN_NEXTVISIBLE;
					while (hDeselectItem != hAnchor) {
						tvItem.hItem = hDeselectItem;
						OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
						hDeselectItem = OS.SendMessage (handle, OS.TVM_GETNEXTITEM, flags, hDeselectItem);
					}
					int hSelectItem = hAnchor;
					rect1.left = hNewItem;
					OS.SendMessage (handle, OS.TVM_GETITEMRECT, 1, rect1);
					rect2.left = hSelectItem;
					OS.SendMessage (handle, OS.TVM_GETITEMRECT, 1, rect2);
					tvItem.state = OS.TVIS_SELECTED;
					flags = rect1.top < rect2.top ? OS.TVGN_PREVIOUSVISIBLE : OS.TVGN_NEXTVISIBLE;
					while (hSelectItem != hNewItem) {
						tvItem.hItem = hSelectItem;
						OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
						hSelectItem = OS.SendMessage (handle, OS.TVM_GETNEXTITEM, flags, hSelectItem);
					}
					tvItem.hItem = hNewItem;
					OS.SendMessage (handle, OS.TVM_SETITEM, 0, tvItem);
					tvItem.mask = OS.TVIF_PARAM;
					tvItem.hItem = hNewItem;
					OS.SendMessage (handle, OS.TVM_GETITEM, 0, tvItem);
					Event event = new Event ();
					event.item = items [tvItem.lParam];
					postEvent (SWT.Selection, event);