tablecursor.java

源码为Eclipse开源开发平台桌面开发工具SWT的源代码,

		        int leadKey = (getStyle() & SWT.RIGHT_TO_LEFT) != 0 ? SWT.ARROW_RIGHT : SWT.ARROW_LEFT;
		        if (event.keyCode == leadKey) {
		           setRowColumn(rowIndex, Math.max(0, columnIndex - 1), true);
		        } else {
		           setRowColumn(rowIndex, Math.min(columnCount - 1, columnIndex + 1), true);
		        }
		        break;
        	}
		case SWT.HOME :
			setRowColumn(0, columnIndex, true);
			break;
		case SWT.END :
			{
				int i = table.getItemCount() - 1;
				setRowColumn(i, columnIndex, true);
				break;
			}
		case SWT.PAGE_UP :
			{
				int index = table.getTopIndex();
				if (index == rowIndex) {
					Rectangle rect = table.getClientArea();
					TableItem item = table.getItem(index);
					Rectangle itemRect = item.getBounds(0);
					rect.height -= itemRect.y;
					int height = table.getItemHeight();
					int page = Math.max(1, rect.height / height);
					index = Math.max(0, index - page + 1);
				}
				setRowColumn(index, columnIndex, true);
				break;
			}
		case SWT.PAGE_DOWN :
			{
				int index = table.getTopIndex();
				Rectangle rect = table.getClientArea();
				TableItem item = table.getItem(index);
				Rectangle itemRect = item.getBounds(0);
				rect.height -= itemRect.y;
				int height = table.getItemHeight();
				int page = Math.max(1, rect.height / height);
				int end = table.getItemCount() - 1;
				index = Math.min(end, index + page - 1);
				if (index == rowIndex) {
					index = Math.min(end, index + page - 1);
				}
				setRowColumn(index, columnIndex, true);
				break;
			}
	}
}

void paint(Event event) {
	if (row == null) return;
	int columnIndex = column == null ? 0 : table.indexOf(column);
	GC gc = event.gc;
	Display display = getDisplay();
	gc.setBackground(getBackground());
	gc.setForeground(getForeground());
	gc.fillRectangle(event.x, event.y, event.width, event.height);
	int x = 0;
	Point size = getSize();
	Image image = row.getImage(columnIndex);
	if (image != null) {
		Rectangle imageSize = image.getBounds();
		int imageY = (size.y - imageSize.height) / 2;
		gc.drawImage(image, x, imageY);
		x += imageSize.width;
	}
	String text = row.getText(columnIndex);
	if (text != "") { //$NON-NLS-1$
		Rectangle bounds = row.getBounds(columnIndex);
		Point extent = gc.stringExtent(text);
		// Temporary code - need a better way to determine table trim
		String platform = SWT.getPlatform();
		if ("win32".equals(platform)) { //$NON-NLS-1$
			if (table.getColumnCount() == 0 || columnIndex == 0) {
				x += 2; 
			} else {
				int alignmnent = column.getAlignment();
				switch (alignmnent) {
					case SWT.LEFT:
						x += 6;
						break;
					case SWT.RIGHT:
						x = bounds.width - extent.x - 6;
						break;
					case SWT.CENTER:
						x += (bounds.width - x - extent.x) / 2;
						break;
				}
			}
		}  else {
			if (table.getColumnCount() == 0) {
				x += 5; 
			} else {
				int alignmnent = column.getAlignment();
				switch (alignmnent) {
					case SWT.LEFT:
						x += 5;
						break;
					case SWT.RIGHT:
						x = bounds.width- extent.x - 2;
						break;
					case SWT.CENTER:
						x += (bounds.width - x - extent.x) / 2 + 2;
						break;
				}
			}
		}
		int textY = (size.y - extent.y) / 2;
		gc.drawString(text, x, textY);
	}
	if (isFocusControl()) {
		gc.setBackground(display.getSystemColor(SWT.COLOR_BLACK));
		gc.setForeground(display.getSystemColor(SWT.COLOR_WHITE));
		gc.drawFocus(0, 0, size.x, size.y);
	}
}

void tableFocusIn(Event event) {
	if (isDisposed())
		return;
	if (isVisible())
		setFocus();
}

void tableMouseDown(Event event) {
	if (isDisposed() || !isVisible()) return;
	Point pt = new Point(event.x, event.y);
	Rectangle clientRect = table.getClientArea();
	int columnCount = table.getColumnCount();
	int maxColumnIndex =  columnCount == 0 ? 0 : columnCount - 1;
	int start = table.getTopIndex();
	int end = table.getItemCount();
	for (int i = start; i < end; i++) {
		TableItem item = table.getItem(i);
		for (int j = 0; j <= maxColumnIndex; j++) {
			Rectangle rect = item.getBounds(j);
			if (rect.y > clientRect.y + clientRect.height) 	return;
			if (rect.contains(pt)) {
				setRowColumn(i, j, true);
				setFocus();
				return;
			}
		}
	}
}

void traverse(Event event) {
	switch (event.detail) {
		case SWT.TRAVERSE_ARROW_NEXT :
		case SWT.TRAVERSE_ARROW_PREVIOUS :
		case SWT.TRAVERSE_RETURN :
			event.doit = false;
			return;
	}
	event.doit = true;
}
void setRowColumn(int row, int column, boolean notify) {
	TableItem item = row == -1 ? null : table.getItem(row);
	TableColumn col = column == -1 || table.getColumnCount() == 0 ? null : table.getColumn(column);
	setRowColumn(item, col, notify);
}
void setRowColumn(TableItem row, TableColumn column, boolean notify) {
	if (this.row == row && this.column == column) {
		return;
	}
	if (this.row != null && this.row != row) {
		this.row.removeListener(SWT.Dispose, disposeItemListener);
		this.row = null;
	}
	if (this.column != null && this.column != column) {
		this.column.removeListener(SWT.Dispose, disposeColumnListener);
		this.column.removeListener(SWT.Move, resizeListener);
		this.column.removeListener(SWT.Resize, resizeListener);
		this.column = null;
	}
	if (row != null) {
		if (this.row != row) {
			this.row = row;
			row.addListener(SWT.Dispose, disposeItemListener);
			table.showItem(row);
		}
		if (this.column != column && column != null) {
			this.column = column;
			column.addListener(SWT.Dispose, disposeColumnListener);
			column.addListener(SWT.Move, resizeListener);
			column.addListener(SWT.Resize, resizeListener);
			table.showColumn(column);
		}
		int columnIndex = column == null ? 0 : table.indexOf(column);
		setBounds(row.getBounds(columnIndex));
		redraw();
		if (notify) {
			notifyListeners(SWT.Selection, new Event());
		}
	}
}

public void setVisible(boolean visible) {
	checkWidget();
	if (visible) resize();
	super.setVisible(visible);
}

/**
 * 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(SelectionListener)
 * 
 * @since 3.0
 */
public void removeSelectionListener(SelectionListener listener) {
	checkWidget();
	if (listener == null) {
		SWT.error(SWT.ERROR_NULL_ARGUMENT);
	}
	removeListener(SWT.Selection, listener);
	removeListener(SWT.DefaultSelection, listener);	
}

void resize() {
	if (row == null) {
		setBounds(-200, -200, 0, 0);
	} else {
		int columnIndex = column == null ? 0 : table.indexOf(column);
		setBounds(row.getBounds(columnIndex));
	}
}
/**
 * Returns the column over which the TableCursor is positioned.
 *
 * @return the column for the current position
 *
 * @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 getColumn() {
	checkWidget();
	return column == null ? 0 : table.indexOf(column);
}
/**
 * Returns the row over which the TableCursor is positioned.
 *
 * @return the item for the current position
 *
 * @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 TableItem getRow() {
	checkWidget();
	return row;
}
public void setBackground (Color color) {
	if (color == null) color = getDisplay().getSystemColor(BACKGROUND);
	super.setBackground(color);
	redraw();
}
public void setForeground (Color color) {
	if (color == null) color = getDisplay().getSystemColor(FOREGROUND);
	super.setForeground(color);
	redraw();
}
/**
 * Positions the TableCursor over the cell at the given row and column in the parent table. 
 *
 * @param row the index of the row for the cell to select
 * @param column the index of column for the cell 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 row, int column) {
	checkWidget();
	int columnCount = table.getColumnCount();
	int maxColumnIndex =  columnCount == 0 ? 0 : columnCount - 1;
	if (row < 0
	    || row >= table.getItemCount()
		|| column < 0
		|| column > maxColumnIndex)
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	setRowColumn(row, column, false);
}
/**
 * Positions the TableCursor over the cell at the given row and column in the parent table. 
 *
 * @param row the TableItem of the row for the cell to select
 * @param column the index of column for the cell 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(TableItem row, int column) {
	checkWidget();
	int columnCount = table.getColumnCount();
	int maxColumnIndex =  columnCount == 0 ? 0 : columnCount - 1;
	if (row == null
		|| row.isDisposed()
		|| column < 0
		|| column > maxColumnIndex)
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	setRowColumn(table.indexOf(row), column, false);
}
}