e948. scrolling a cell to the center of a jtable component.txt

这里面包含了一百多个JAVA源文件

This example demonstrates how to scroll the view so that a specified cell appears in the center of the view. 
    // Make the cell (1,2) is appear in the center of the view
    int rowIndex = 1;
    int vColIndex = 2;
    scrollToCenter(table, rowIndex, vColIndex);
    
    // Assumes table is contained in a JScrollPane. Scrolls the
    // cell (rowIndex, vColIndex) so that it is visible at the center of viewport.
    public void scrollToCenter(JTable table, int rowIndex, int vColIndex) {
        if (!(table.getParent() instanceof JViewport)) {
            return;
        }
        JViewport viewport = (JViewport)table.getParent();
    
        // This rectangle is relative to the table where the
        // northwest corner of cell (0,0) is always (0,0).
        Rectangle rect = table.getCellRect(rowIndex, vColIndex, true);
    
        // The location of the view relative to the table
        Rectangle viewRect = viewport.getViewRect();
    
        // Translate the cell location so that it is relative
        // to the view, assuming the northwest corner of the
        // view is (0,0).
        rect.setLocation(rect.x-viewRect.x, rect.y-viewRect.y);
    
        // Calculate location of rect if it were at the center of view
        int centerX = (viewRect.width-rect.width)/2;
        int centerY = (viewRect.height-rect.height)/2;
    
        // Fake the location of the cell so that scrollRectToVisible
        // will move the cell to the center
        if (rect.x < centerX) {
            centerX = -centerX;
        }
        if (rect.y < centerY) {
            centerY = -centerY;
        }
        rect.translate(centerX, centerY);
    
        // Scroll the area into view.
        viewport.scrollRectToVisible(rect);
    }

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