table.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

		TableItem item = items [i];
		if (item != null) {
			cleared = true;
			item.clear ();
			/*
			* Bug in Windows.  Despite the fact that every item in the
			* table always has LPSTR_TEXTCALLBACK, Windows caches the
			* bounds for the selected items.  This means that 
			* when you change the string to be something else, Windows
			* correctly asks you for the new string but when the item
			* is selected, the selection draws using the bounds of the
			* previous item.  The fix is to reset LPSTR_TEXTCALLBACK
			* even though it has not changed, causing Windows to flush
			* cached bounds.
			*/
			if ((style & SWT.VIRTUAL) == 0 && item.cached) {
				if (lvItem == null) {
					lvItem = new LVITEM ();
					lvItem.mask = OS.LVIF_TEXT | OS.LVIF_INDENT;
					lvItem.pszText = OS.LPSTR_TEXTCALLBACK;
				}
				lvItem.iItem = i;
				OS.SendMessage (handle, OS.LVM_SETITEM, 0, lvItem);
				item.cached = false;
			}
		}
	}
	if (cleared) {
		if (!ignoreRedraw && drawCount == 0 && OS.IsWindowVisible (handle)) {
			OS.SendMessage (handle, OS.LVM_REDRAWITEMS, 0, count - 1);
		}
		setScrollWidth (null, false);
	}
}

public Point computeSize (int wHint, int hHint, boolean changed) {
	checkWidget ();
	if (fixScrollWidth) setScrollWidth (null, true);
	int bits = 0;
	if (wHint != SWT.DEFAULT) {
		bits |= wHint & 0xFFFF;
	} else {
		int width = 0;
		int hwndHeader = OS.SendMessage (handle, OS.LVM_GETHEADER, 0, 0);
		int count = OS.SendMessage (hwndHeader, OS.HDM_GETITEMCOUNT, 0, 0);
		for (int i=0; i<count; i++) {
			width += OS.SendMessage (handle, OS.LVM_GETCOLUMNWIDTH, i, 0);
		}
		bits |= width & 0xFFFF;
	}
	if (hHint != SWT.DEFAULT) bits |= hHint << 16;
	int result = OS.SendMessage (handle, OS.LVM_APPROXIMATEVIEWRECT, -1, bits);
	int width = result & 0xFFFF, height = result >> 16;
	
	/*
	* Feature in Windows.  The height returned by LVM_APPROXIMATEVIEWRECT
	* includes the trim plus the height of the items plus one extra row.
	* The fix is to subtract the height of one row from the result height.
	*/
	int empty = OS.SendMessage (handle, OS.LVM_APPROXIMATEVIEWRECT, 0, 0);
	int oneItem = OS.SendMessage (handle, OS.LVM_APPROXIMATEVIEWRECT, 1, 0);
	height -= (oneItem >> 16) - (empty >> 16);
	
	if (width == 0) width = DEFAULT_WIDTH;
	if (height == 0) height = DEFAULT_HEIGHT;
	if (wHint != SWT.DEFAULT) width = wHint;
	if (hHint != SWT.DEFAULT) height = hHint;
	int border = getBorderWidth ();
	width += border * 2;  height += border * 2;
	if ((style & SWT.V_SCROLL) != 0) {
		width += OS.GetSystemMetrics (OS.SM_CXVSCROLL);
	}
	if ((style & SWT.H_SCROLL) != 0) {
		height += OS.GetSystemMetrics (OS.SM_CYHSCROLL);
	}
	return new Point (width, height);
}

void createHandle () {
	super.createHandle ();
	state &= ~CANVAS;

	/* 
	* This code is intentionally commented.  According to
	* the documentation, setting the default item size is
	* supposed to improve performance.  By experimentation,
	* this does not seem to have much of an effect.
	*/	
//	OS.SendMessage (handle, OS.LVM_SETITEMCOUNT, 1024 * 2, 0);

	/* Set the checkbox image list */
	if ((style & SWT.CHECK) != 0) {
		int empty = OS.SendMessage (handle, OS.LVM_APPROXIMATEVIEWRECT, 0, 0);
		int oneItem = OS.SendMessage (handle, OS.LVM_APPROXIMATEVIEWRECT, 1, 0);
		int width = (oneItem >> 16) - (empty >> 16), height = width;
		setCheckboxImageList (width, height);
		OS.SendMessage (handle, OS. LVM_SETCALLBACKMASK, OS.LVIS_STATEIMAGEMASK, 0);
	}

	/*
	* Feature in Windows.  When the control is created,
	* it does not use the default system font.  A new HFONT
	* is created and destroyed when the control is destroyed.
	* This means that a program that queries the font from
	* this control, uses the font in another control and then
	* destroys this control will have the font unexpectedly
	* destroyed in the other control.  The fix is to assign
	* the font ourselves each time the control is created.
	* The control will not destroy a font that it did not
	* create.
	*/
	int hFont = OS.GetStockObject (OS.SYSTEM_FONT);
	OS.SendMessage (handle, OS.WM_SETFONT, hFont, 0);

	/*
	* Bug in Windows.  When the first column is inserted
	* without setting the header text, Windows will never
	* allow the header text for the first column to be set.
	* The fix is to set the text to an empty string when
	* the column is inserted.
	*/
	LVCOLUMN lvColumn = new LVCOLUMN ();
	lvColumn.mask = OS.LVCF_TEXT;
	int hHeap = OS.GetProcessHeap ();
	int pszText = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, TCHAR.sizeof);
	lvColumn.pszText = pszText;
	OS.SendMessage (handle, OS.LVM_INSERTCOLUMN, 0, lvColumn);
	OS.HeapFree (hHeap, 0, pszText);

	/* Set the extended style bits */
	int bits = OS.LVS_EX_SUBITEMIMAGES | OS.LVS_EX_LABELTIP;
	if ((style & SWT.FULL_SELECTION) != 0) bits |= OS.LVS_EX_FULLROWSELECT;
	OS.SendMessage (handle, OS.LVM_SETEXTENDEDLISTVIEWSTYLE, bits, bits);
	
	/*
	* Feature in Windows.  Windows does not explicitly set the orientation of
	* the header.  Instead, the orientation is inherited when WS_EX_LAYOUTRTL
	* is specified for the table.  This means that when both WS_EX_LAYOUTRTL
	* and WS_EX_NOINHERITLAYOUT are specified for the table, the header will
	* not be oriented correctly.  The fix is to explicitly set the orientation
	* for the header.
	* 
	* NOTE: WS_EX_LAYOUTRTL is not supported on Windows NT.
	*/
	if ((OS.WIN32_MAJOR << 16 | OS.WIN32_MINOR) < (4 << 16 | 10)) return;
	if ((style & SWT.RIGHT_TO_LEFT) != 0) {
		int hwndHeader = OS.SendMessage (handle, OS.LVM_GETHEADER, 0, 0);
		int exStyle = OS.GetWindowLong (hwndHeader, OS.GWL_EXSTYLE);
		OS.SetWindowLong (hwndHeader, OS.GWL_EXSTYLE, exStyle | OS.WS_EX_LAYOUTRTL);
	}
}

void createItem (TableColumn column, int index) {
	int hwndHeader = OS.SendMessage (handle, OS.LVM_GETHEADER, 0, 0);
	int count = OS.SendMessage (hwndHeader, OS.HDM_GETITEMCOUNT, 0, 0);
	int columnCount = count + 1;
	if (count == 1 && columns [0] == null) count = 0;
	if (!(0 <= index && index <= count)) error (SWT.ERROR_INVALID_RANGE);
	if (count == columns.length) {
		TableColumn [] newColumns = new TableColumn [columns.length + 4];
		System.arraycopy (columns, 0, newColumns, 0, columns.length);
		columns = newColumns;
	}
	int itemCount = OS.SendMessage (handle, OS.LVM_GETITEMCOUNT, 0, 0);
	for (int i=0; i<itemCount; i++) {
		TableItem item = items [i];
		if (item != null) {
			String [] strings = item.strings;
			if (strings != null) {
				String [] temp = new String [columnCount];
				System.arraycopy (strings, 0, temp, 0, index);
				System.arraycopy (strings, index, temp, index+1, columnCount-index-1);
				item.strings = temp;
			}
			Image [] images = item.images;
			if (images != null) {
				Image [] temp = new Image [columnCount];
				System.arraycopy (images, 0, temp, 0, index);
				System.arraycopy (images, index, temp, index+1, columnCount-index-1);
				item.images = temp;
			}
			if (index == 0) {
				if (count != 0) {
					if (strings == null) {
						item.strings = new String [columnCount];
						item.strings [1] = item.text;
					}
					item.text = "";
					if (images == null) {
						item.images = new Image [columnCount];
						item.images [1] = item.image;
					}
					item.image = null;
				}
			}
			if (item.cellBackground != null) {
				int [] cellBackground = item.cellBackground;
				int [] temp = new int [columnCount];
				System.arraycopy (cellBackground, 0, temp, 0, index);
				System.arraycopy (cellBackground, index, temp, index+1, columnCount-index-1);
				temp [index] = -1;
				item.cellBackground = temp;
			}
			if (item.cellForeground != null) {
				int [] cellForeground = item.cellForeground;
				int [] temp = new int [columnCount];
				System.arraycopy (cellForeground, 0, temp, 0, index);
				System.arraycopy (cellForeground, index, temp, index+1, columnCount-index-1);
				temp [index] = -1;
				item.cellForeground = temp;
			}
			if (item.cellFont != null) {
				int [] cellFont = item.cellFont;
				int [] temp = new int [columnCount];
				System.arraycopy (cellFont, 0, temp, 0, index);
				System.arraycopy (cellFont, index, temp, index+1, columnCount-index-1);
				temp [index] = -1;
				item.cellFont = temp;
			}
		}
	}
	/*
	* Insert the column into the columns array before inserting
	* it into the widget so that the column will be present when
	* any callbacks are issued as a result of LVM_INSERTCOLUMN
	* or LVM_SETCOLUMN.
	*/
	System.arraycopy (columns, index, columns, index + 1, count - index);
	columns [index] = column;
	if (index == 0) {
		if (count > 0) {
			LVCOLUMN lvColumn = new LVCOLUMN ();
			lvColumn.mask = OS.LVCF_WIDTH;
			OS.SendMessage (handle, OS.LVM_INSERTCOLUMN, 1, lvColumn);
			OS.SendMessage (handle, OS.LVM_GETCOLUMN, 1, lvColumn);
			int width = lvColumn.cx;
			int cchTextMax = 1024;
			int hHeap = OS.GetProcessHeap ();
			int byteCount = cchTextMax * TCHAR.sizeof;
			int pszText = OS.HeapAlloc (hHeap, OS.HEAP_ZERO_MEMORY, byteCount);
			lvColumn.mask = OS.LVCF_TEXT | OS.LVCF_IMAGE | OS.LVCF_WIDTH | OS.LVCF_FMT;
			lvColumn.pszText = pszText;
			lvColumn.cchTextMax = cchTextMax;
			OS.SendMessage (handle, OS.LVM_GETCOLUMN, 0, lvColumn);
			OS.SendMessage (handle, OS.LVM_SETCOLUMN, 1, lvColumn);
			lvColumn.fmt = OS.LVCFMT_IMAGE;
			lvColumn.cx = width;
			lvColumn.iImage = OS.I_IMAGENONE;
			lvColumn.pszText = lvColumn.cchTextMax = 0;
			OS.SendMessage (handle, OS.LVM_SETCOLUMN, 0, lvColumn);
			lvColumn.mask = OS.LVCF_FMT;
			lvColumn.fmt = OS.LVCFMT_LEFT;
			OS.SendMessage (handle, OS.LVM_SETCOLUMN, 0, lvColumn);
			if (pszText != 0) OS.HeapFree (hHeap, 0, pszText);
		} else {
			OS.SendMessage (handle, OS.LVM_SETCOLUMNWIDTH, 0, 0);
		}
		if ((parent.style & SWT.VIRTUAL) == 0) {
			LVITEM lvItem = new LVITEM ();
			lvItem.mask = OS.LVIF_TEXT | OS.LVIF_IMAGE;
			lvItem.pszText = OS.LPSTR_TEXTCALLBACK;
			lvItem.iImage = OS.I_IMAGECALLBACK;
			for (int i=0; i<itemCount; i++) {
				lvItem.iItem = i;
				OS.SendMessage (handle, OS.LVM_SETITEM, 0, lvItem);
			}
		}
	} else {
		int fmt = OS.LVCFMT_LEFT;
		if ((column.style & SWT.CENTER) == SWT.CENTER) fmt = OS.LVCFMT_CENTER;
		if ((column.style & SWT.RIGHT) == SWT.RIGHT) fmt = OS.LVCFMT_RIGHT;
		LVCOLUMN lvColumn = new LVCOLUMN ();
		lvColumn.mask = OS.LVCF_WIDTH | OS.LVCF_FMT;
		lvColumn.fmt = fmt;
		OS.SendMessage (handle, OS.LVM_INSERTCOLUMN, index, lvColumn);
	}
}

void createItem (TableItem item, int index) {
	int count = OS.SendMessage (handle, OS.LVM_GETITEMCOUNT, 0, 0);
	if (!(0 <= index && index <= count)) error (SWT.ERROR_INVALID_RANGE);
	if (count == items.length) {
		/*
		* Grow the array faster when redraw is off or the
		* table is not visible.  When the table is painted,
		* the items array is resized to be smaller to reduce
		* memory usage.
		*/
		boolean small = drawCount == 0 && OS.IsWindowVisible (handle);
		int length = small ? items.length + 4 : Math.max (4, items.length * 3 / 2);
		TableItem [] newItems = new TableItem [length];
		System.arraycopy (items, 0, newItems, 0, items.length);
		items = newItems;
	}
	LVITEM lvItem = new LVITEM ();
	lvItem.iItem = index;
	lvItem.pszText = OS.LPSTR_TEXTCALLBACK;
	lvItem.mask |= OS.LVIF_TEXT;

	/*
	* Bug in Windows.  Despite the fact that the image list
	* index has never been set for the item, Windows always
	* assumes that the image index for the item is valid.
	* When an item is inserted, the image index is zero.
	* Therefore, when the first image is inserted and is
	* assigned image index zero, every item draws with this
	* image.  The fix is to set the image index when the
	* the item is created.
	*/
	lvItem.iImage = OS.I_IMAGECALLBACK;
	lvItem.mask |= OS.LVIF_IMAGE;

	/* Insert the item */
	ignoreSelect = true;
	int result = OS.SendMessage (handle, OS.LVM_INSERTITEM, 0, lvItem);
	ignoreSelect = false;
	if (result == -1) error (SWT.ERROR_ITEM_NOT_ADDED);
	System.arraycopy (items, index, items, index + 1, count - index);
	items [index] = item;
}

void createWidget () {
	super.createWidget ();
	items = new TableItem [4];
	columns = new TableColumn [4];
}

int defaultBackground () {
	return OS.GetSysColor (OS.COLOR_WINDOW);
}

/**
 * Deselects the items at the given zero-relative indices in the receiver.
 * If the item at the given zero-relative index in the receiver 
 * is selected, it is deselected.  If the item at the index
 * was not selected, it remains deselected. Indices that are out
 * of range and duplicate indices are ignored.
 *
 * @param indices the array of indices for the items to deselect
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the set 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>
 */
public void deselect (int [] indices) {
	checkWidget ();
	if (indices == null) error (SWT.ERROR_NULL_ARGUMENT);
	if (indices.length == 0) return;
	LVITEM lvItem = new LVITEM ();
	lvItem.stateMask = OS.LVIS_SELECTED;
	for (int i=0; i<indices.length; i++) {
		/*
		* An index of -1 will apply the change to all
		* items.  Ensure that indices are greater than -1.
		*/
		if (indices [i] >= 0) {
			ignoreSelect = true;
			OS.SendMessage (handle, OS.LVM_SETITEMSTATE, indices [i], lvItem);
			ignoreSelect = false;
		}
	}
}

/**
 * Deselects the item at the given zero-relative index in the receiver.
 * If the item at the index was already deselected, it remains
 * deselected. Indices that are out of range are ignored.
 *
 * @param index the index of the item to deselect