java - JTable 滚动到指定的行索引

Question

我有一个 JTable，它JScrollPane.在运行时根据我的应用程序中发生的事件添加到表中。当向表中添加新行时，我想让 scoll 窗格滚动到表的底部。

对于 JLists 有[ensureIndexIsVisible][1]()强制列表中的特定索引可见。我正在寻找相同的东西，但要寻找 JTable。看起来我可能必须手动移动滚动窗格上的滚动视图，但我认为必须有一种更简单的方法。

Answer 1

很简单，JTable 也有 scrollRectToVisible 方法。如果你愿意，如果添加了新记录，你可以尝试这样的方法使滚动窗格转到底部：

jTable1.getSelectionModel().setSelectionInterval(i, i);
jTable1.scrollRectToVisible(new Rectangle(jTable1.getCellRect(i, 0, true)));

我最后添加的记录在哪里。

Answer 2

请参阅此示例：http ://www.exampledepot.com/egs/javax.swing.table/Vis.html

更新：该链接现已过时，这里是代码（来自http://smi-protege.stanford.edu/repos/protege/protege-core/trunk/src/edu/stanford/smi/protege/util/ComponentUtilities.爪哇)

public static void scrollToVisible(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 viewport relative to the table
        Point pt = viewport.getViewPosition();

        // 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-pt.x, rect.y-pt.y);

        table.scrollRectToVisible(rect);

        // Scroll the area into view
        //viewport.scrollRectToVisible(rect);
    }

Answer 3

JList 在内部使用scrollRectToVisible并指定要滚动到的坐标。我认为您将不得不为 JTable 重新编码类似的功能。

Answer 4

第一个答案效果很好，但所选行位于表格底部。所以我创建了这个修改版本：

private void scrollToVisible(int rowIndex, int vColIndex ) {
        JTable table = getTablePanel().getTable();
        if (!(table.getParent() instanceof JViewport)) {
            return;
        }
        if (table.getRowCount()<1){
            return;
        }
        JViewport viewport = (JViewport)table.getParent();
        // view dimension
        Dimension dim = viewport.getExtentSize();
        // cell dimension
        Dimension dimOne = new Dimension(0,0);

        // 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);
        Rectangle rectOne;
        if (rowIndex+1<table.getRowCount()) {
            if (vColIndex+1<table.getColumnCount())
                vColIndex++;
            rectOne = table.getCellRect(rowIndex+1, vColIndex, true);
            dimOne.width=rectOne.x-rect.x;
            dimOne.height=rectOne.y-rect.y;
        }

        // '+ veiw dimension - cell dimension' to set first selected row on the top

        rect.setLocation(rect.x+dim.width-dimOne.width, rect.y+dim.height-dimOne.height);

        table.scrollRectToVisible(rect);
    }

现在选定的行位于表格的顶部。

Answer 5

在我看来，设置视口位置而不是滚动表格要容易得多。以下是我的代码。

public void scrollCellToView(int rowIndex, int vColIndex) {
    if (!(this.getParent() instanceof JViewport)) {
        return;
    }
    JViewport viewport = (JViewport) this.getParent();
    Rectangle rect = this.getCellRect(rowIndex, vColIndex, true);
    Rectangle viewRect = viewport.getViewRect();

    int x = viewRect.x;
    int y = viewRect.y;

    if (rect.x >= viewRect.x && rect.x <= (viewRect.x + viewRect.width - rect.width)){

    } else if (rect.x < viewRect.x){
        x = rect.x;
    } else if (rect.x > (viewRect.x + viewRect.width - rect.width)) {
        x = rect.x - viewRect.width + rect.width;
    }

    if (rect.y >= viewRect.y && rect.y <= (viewRect.y + viewRect.height - rect.height)){

    } else if (rect.y < viewRect.y){
        y = rect.y;
    } else if (rect.y > (viewRect.y + viewRect.height - rect.height)){
        y = rect.y - viewRect.height + rect.height;
    }

    viewport.setViewPosition(new Point(x,y));
}