list.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

		setScrollWidth (newWidth, false);
	}
	if (topCount > 0) {
		topIndex -= topCount;
		OS.SendMessage (handle, OS.LB_SETTOPINDEX, topIndex, 0);
	}
	if (i < newIndices.length) error (SWT.ERROR_ITEM_NOT_REMOVED);
}

/**
 * Removes the item from the receiver at the given
 * zero-relative index.
 *
 * @param index the index for the item
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_RANGE - if the index is not between 0 and the number of elements in the list minus 1 (inclusive)</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>
 * @exception SWTError <ul>
 *    <li>ERROR_ITEM_NOT_REMOVED - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public void remove (int index) {
	checkWidget ();
	TCHAR buffer = null;
	if ((style & SWT.H_SCROLL) != 0) {
		int length = OS.SendMessage (handle, OS.LB_GETTEXTLEN, index, 0);
		if (length == OS.LB_ERR) error (SWT.ERROR_ITEM_NOT_REMOVED);
		buffer = new TCHAR (getCodePage (), length + 1);
		int result = OS.SendMessage (handle, OS.LB_GETTEXT, index, buffer);
		if (result == OS.LB_ERR) error (SWT.ERROR_ITEM_NOT_REMOVED);
	}
	int topIndex = OS.SendMessage (handle, OS.LB_GETTOPINDEX, 0, 0);
	int result = OS.SendMessage (handle, OS.LB_DELETESTRING, index, 0);
	if (result == OS.LB_ERR) {
		int count = OS.SendMessage (handle, OS.LB_GETCOUNT, 0, 0);
		if (0 <= index && index < count) error (SWT.ERROR_ITEM_NOT_REMOVED);
		error (SWT.ERROR_INVALID_RANGE);
	}
	if ((style & SWT.H_SCROLL) != 0) setScrollWidth (buffer, false);
	if (index < topIndex) {
		OS.SendMessage (handle, OS.LB_SETTOPINDEX, topIndex - 1, 0);
	}
}

/**
 * Removes the items from the receiver which are
 * between the given zero-relative start and end 
 * indices (inclusive).
 *
 * @param start the start of the range
 * @param end the end of the range
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_RANGE - if either the start or end are not between 0 and the number of elements in the list minus 1 (inclusive)</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>
 * @exception SWTError <ul>
 *    <li>ERROR_ITEM_NOT_REMOVED - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public void remove (int start, int end) {
	checkWidget ();
	if (start > end) return;
	int count = OS.SendMessage (handle, OS.LB_GETCOUNT, 0, 0);
	if (!(0 <= start && start <= end && end < count)) {
		error (SWT.ERROR_INVALID_RANGE);
	}
	if (start == 0 && end == count - 1) {
		removeAll ();
		return;
	} 
	int topIndex = OS.SendMessage (handle, OS.LB_GETTOPINDEX, 0, 0);
	RECT rect = null;
	int hDC = 0, oldFont = 0, newFont = 0, newWidth = 0;
	if ((style & SWT.H_SCROLL) != 0) {
		rect = new RECT ();
		hDC = OS.GetDC (handle);
		newFont = OS.SendMessage (handle, OS.WM_GETFONT, 0, 0);
		if (newFont != 0) oldFont = OS.SelectObject (hDC, newFont);
	}
	int cp = getCodePage ();
	int index = start;
	int flags = OS.DT_CALCRECT | OS.DT_SINGLELINE | OS.DT_NOPREFIX;
	while (index <= end) {
		TCHAR buffer = null;
		if ((style & SWT.H_SCROLL) != 0) {
			int length = OS.SendMessage (handle, OS.LB_GETTEXTLEN, start, 0);
			if (length == OS.LB_ERR) break;
			buffer = new TCHAR (cp, length + 1);
			int result = OS.SendMessage (handle, OS.LB_GETTEXT, start, buffer);
			if (result == OS.LB_ERR) break;
		}
		int result = OS.SendMessage (handle, OS.LB_DELETESTRING, start, 0);
		if (result == OS.LB_ERR) break;
		if ((style & SWT.H_SCROLL) != 0) {
			OS.DrawText (hDC, buffer, -1, rect, flags);
			newWidth = Math.max (newWidth, rect.right - rect.left);
		}
		index++;
	}
	if ((style & SWT.H_SCROLL) != 0) {
		if (newFont != 0) OS.SelectObject (hDC, oldFont);
		OS.ReleaseDC (handle, hDC);
		setScrollWidth (newWidth, false);
	}
	if (end < topIndex) {
		topIndex -= end - start + 1;
		OS.SendMessage (handle, OS.LB_SETTOPINDEX, topIndex, 0);
	}
	if (index <= end) error (SWT.ERROR_ITEM_NOT_REMOVED);
}

/**
 * Searches the receiver's list starting at the first item
 * until an item is found that is equal to the argument, 
 * and removes that item from the list.
 *
 * @param string the item to remove
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the string is not found in the list</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>
 * @exception SWTError <ul>
 *    <li>ERROR_ITEM_NOT_REMOVED - if the operation fails because of an operating system failure</li>
 * </ul>
 */
public void remove (String string) {
	checkWidget ();
	int index = indexOf (string, 0);
	if (index == -1) error (SWT.ERROR_INVALID_ARGUMENT);
	remove (index);
}

/**
 * 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 ();
	OS.SendMessage (handle, OS.LB_RESETCONTENT, 0, 0);
	if ((style & SWT.H_SCROLL) != 0) {
		OS.SendMessage (handle, OS.LB_SETHORIZONTALEXTENT, 0, 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);
	if (eventTable == null) return;
	eventTable.unhook (SWT.Selection, listener);
	eventTable.unhook (SWT.DefaultSelection,listener);	
}

/**
 * Selects the items at the given zero-relative indices in the receiver.
 * The current selection is not cleared before the new items are selected.
 * <p>
 * If the item at a given index is not selected, it is selected.
 * If the item at a given index was already selected, it remains selected.
 * Indices that are out of range and duplicate indices are ignored.
 * If the receiver is single-select and multiple indices are specified,
 * then all indices are ignored.
 *
 * @param indices the array of indices for the items to select
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the array of indices 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 List#setSelection(int[])
 */
public void select (int [] indices) {
	checkWidget ();
	if (indices == null) error (SWT.ERROR_NULL_ARGUMENT);
	int length = indices.length;
	if (length == 0 || ((style & SWT.SINGLE) != 0 && length > 1)) return;
	select (indices, false);
}

void select (int [] indices, boolean scroll) {
	int i = 0;
	while (i < indices.length) {
		int index = indices [i];
		if (index != -1) {
			select (index, false);
		}
		i++;
	}
	if (scroll) showSelection ();
}

/**
 * Selects the item at the given zero-relative index in the receiver's 
 * list.  If the item at the index was already selected, it remains
 * 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 select (int index) {
	checkWidget ();
	select (index, false);
}

void select (int index, boolean scroll) {
	if (index < 0) return;
	int count = OS.SendMessage (handle, OS.LB_GETCOUNT, 0, 0);
	if (index >= count) return;
	if (scroll) {
		if ((style & SWT.SINGLE) != 0) {
			OS.SendMessage (handle, OS.LB_SETCURSEL, index, 0);
		} else {
			OS.SendMessage (handle, OS.LB_SETSEL, 1, index);	
		}		
		return;
	}
	int topIndex = OS.SendMessage (handle, OS.LB_GETTOPINDEX, 0, 0);
	RECT itemRect = new RECT (), selectedRect = null;
	OS.SendMessage (handle, OS.LB_GETITEMRECT, index, itemRect);
	boolean redraw = drawCount == 0 && OS.IsWindowVisible (handle);
	if (redraw) {
		OS.UpdateWindow (handle);
		OS.SendMessage (handle, OS.WM_SETREDRAW, 0, 0);
	}
	int focusIndex = -1;
	if ((style & SWT.SINGLE) != 0) {
		int oldIndex = OS.SendMessage (handle, OS.LB_GETCURSEL, 0, 0);
		if (oldIndex != -1) {
			selectedRect = new RECT ();
			OS.SendMessage (handle, OS.LB_GETITEMRECT, oldIndex, selectedRect);
		}
		OS.SendMessage (handle, OS.LB_SETCURSEL, index, 0);
	} else {
		focusIndex = OS.SendMessage (handle, OS.LB_GETCARETINDEX, 0, 0);
		OS.SendMessage (handle, OS.LB_SETSEL, 1, index);
	}
	if ((style & SWT.MULTI) != 0) {
		if (focusIndex != -1) {
			OS.SendMessage (handle, OS.LB_SETCARETINDEX, focusIndex, 0);
		}
	}
	OS.SendMessage (handle, OS.LB_SETTOPINDEX, topIndex, 0);
	if (redraw) {
		OS.SendMessage (handle, OS.WM_SETREDRAW, 1, 0);
		OS.ValidateRect (handle, null);
		OS.InvalidateRect (handle, itemRect, true);
		if (selectedRect != null) {
			OS.InvalidateRect (handle, selectedRect, true);
		}
	}
}

/**
 * Selects the items in the range specified by the given zero-relative
 * indices in the receiver. The range of indices is inclusive.
 * The current selection is not cleared before the new items are selected.
 * <p>
 * If an item in the given range is not selected, it is selected.
 * If an item in the given range was already selected, it remains selected.
 * Indices that are out of range are ignored and no items will be selected
 * if start is greater than end.
 * If the receiver is single-select and there is more than one item in the
 * given range, then all indices are ignored.
 *
 * @param start the start of the range
 * @param end the end of the range
 *
 * @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 List#setSelection(int,int)
 */
public void select (int start, int end) {
	checkWidget ();
	if (end < 0 || start > end || ((style & SWT.SINGLE) != 0 && start != end)) return;
	int count = OS.SendMessage (handle, OS.LB_GETCOUNT, 0, 0);
	if (count == 0 || start >= count) return;
	start = Math.max (0, start);
	end = Math.min (end, count - 1);
	if ((style & SWT.SINGLE) != 0) {
		select (start, false);
	} else {
		select (start, end, false);
	}
}

void select (int start, int end, boolean scroll) {
	/*
	* Note that when start = end, LB_SELITEMRANGEEX
	* deselects the item.
	*/
	if (start == end) {
		select (start, scroll);
		return;
	}
	OS.SendMessage (handle, OS.LB_SELITEMRANGEEX, start, end);
	if (scroll) showSelection ();
}
	
/**
 * 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;
	OS.SendMessage (handle, OS.LB_SETSEL, 1, -1);
}

void setBounds (int x, int y, int width, int height, int flags) {
	/*
	* Bug in Windows.  If the receiver is scrolled horizontally
	* and is resized, the list does not redraw properly.  The fix
	* is to redraw the control when resizing is not deferred and
	* the new size is different from the previous size.
	*/
	if (parent.lpwp != null || (flags & OS.SWP_NOSIZE) != 0) {	
		super.setBounds (x, y, width, height, flags);
		return;
	}
	RECT rect = new RECT ();
	OS.GetWindowRect (handle, rect);
	int oldWidth = rect.right - rect.left;
	int oldHeight = rect.bottom - rect.top;
	super.setBounds (x, y, width, height, flags);
	if (oldWidth == width && oldHeight == height) return;
	SCROLLINFO info = new SCROLLINFO ();
	info.cbSize = SCROLLINFO.sizeof;
	info.fMask = OS.SIF_POS;
	if (!OS.GetScrollInfo (handle, OS.SB_HORZ, info)) return;
	if (info.nPos != 0) OS.InvalidateRect (handle, null, true);
}

void setFocusIndex (int index) {
//	checkWidget ();	
	int count = OS.SendMessage (handle, OS.LB_GETCOUNT, 0, 0);
	if (!(0 <= index && index < count)) return;
	OS.SendMessage (handle, OS.LB_SETCARETINDEX, index, 0);
}

public void setFont (Font font) {
	checkWidget ();
	super.setFont (font);
	if ((style & SWT.H_SCROLL) != 0) setScrollWidth ();
}