javax.swing.table.JTableHeader#getResizingColumn ( )源码实例Demo

/**
 * Handle a mouse press event - if the user is NOT resizing a column and NOT dragging a column
 * then give visual feedback that the column header has been pressed.
 *
 * @param e  the mouse event.
 */
public void mousePressed(final MouseEvent e) {

    final JTableHeader header = (JTableHeader) e.getComponent();

    if (header.getResizingColumn() == null) {  // resizing takes precedence over sorting
        if (header.getDraggedDistance() < 1) {   // dragging also takes precedence over sorting
            final int columnIndex = header.columnAtPoint(e.getPoint());
            final int modelColumnIndex 
                = header.getTable().convertColumnIndexToModel(columnIndex);
            if (this.model.isSortable(modelColumnIndex)) {
                this.sortColumnIndex = header.getTable().convertColumnIndexToModel(columnIndex);
                this.renderer.setPressedColumn(this.sortColumnIndex);
                header.repaint();
                if (header.getTable().isEditing()) {
                    header.getTable().getCellEditor().stopCellEditing();
                }
            }
            else {
                this.sortColumnIndex = -1;
            }
        }
    }

}
 

/**
 * When the user releases the mouse button, we attempt to sort the table.
 *
 * @param e  the mouse event.
 */
public void mouseReleased(final MouseEvent e) {

    final JTableHeader header = (JTableHeader) e.getComponent();

    if (header.getResizingColumn() == null) {  // resizing takes precedence over sorting
        if (this.sortColumnIndex != -1) {
            final SortableTableModel model = (SortableTableModel) header.getTable().getModel();
            final boolean ascending = !model.isAscending();
            model.setAscending(ascending);
            model.sortByColumn(this.sortColumnIndex, ascending);

            this.renderer.setPressedColumn(-1);       // clear
            header.repaint();
        }
    }
}
 

/**
 * If the user is dragging or resizing, then we clear the sort column.
 *
 * @param e  the mouse event.
 */
public void mouseDragged(final MouseEvent e) {

    final JTableHeader header = (JTableHeader) e.getComponent();

    if ((header.getDraggedDistance() > 0) || (header.getResizingColumn() != null)) {
        this.renderer.setPressedColumn(-1);
        this.sortColumnIndex = -1;
    }
}
 

public void doLayout() {
    ProfilerColumnModel cModel = _getColumnModel();
    JTableHeader header = getTableHeader();
    TableColumn res = header == null ? null : header.getResizingColumn();
    if (res != null) {
        // Resizing column
        int delta = getWidth() - cModel.getTotalColumnWidth();
        TableColumn next = cModel.getNextVisibleColumn(res);
        if (res == next) {
            res.setWidth(res.getWidth() + delta);
        } else {
            next.setWidth(next.getWidth() + delta);
        }
    } else {
        // Resizing table
        int toResizeIndex = cModel.getFitWidthColumn();
        if (toResizeIndex == -1) {
            super.doLayout();
        } else {
            Enumeration<TableColumn> columns = cModel.getColumns();
            TableColumn toResizeColumn = null;
            int columnsWidth = 0;
            while (columns.hasMoreElements()) {
                TableColumn column = columns.nextElement();
                if (column.getModelIndex() == toResizeIndex) {
                    if (!cModel.isColumnVisible(column)) {
                        super.doLayout();
                        return;
                    }
                    toResizeColumn = column;
                } else {
                    columnsWidth += column.getWidth();
                }
            }
            if (toResizeColumn != null) toResizeColumn.setWidth(getWidth() - columnsWidth);

            // instead of super.doLayout()
            layout();
        }
    }
}
 

public void doLayout() {
    ProfilerColumnModel cModel = _getColumnModel();
    JTableHeader header = getTableHeader();
    TableColumn res = header == null ? null : header.getResizingColumn();
    if (res != null) {
        // Resizing column
        int delta = getWidth() - cModel.getTotalColumnWidth();
        TableColumn next = cModel.getNextVisibleColumn(res);
        if (res == next) {
            res.setWidth(res.getWidth() + delta);
        } else {
            next.setWidth(next.getWidth() + delta);
        }
    } else {
        // Resizing table
        int toResizeIndex = cModel.getFitWidthColumn();
        if (toResizeIndex == -1) {
            super.doLayout();
        } else {
            Enumeration<TableColumn> columns = cModel.getColumns();
            TableColumn toResizeColumn = null;
            int columnsWidth = 0;
            while (columns.hasMoreElements()) {
                TableColumn column = columns.nextElement();
                if (column.getModelIndex() == toResizeIndex) {
                    if (!cModel.isColumnVisible(column)) {
                        super.doLayout();
                        return;
                    }
                    toResizeColumn = column;
                } else {
                    columnsWidth += column.getWidth();
                }
            }
            if (toResizeColumn != null) toResizeColumn.setWidth(getWidth() - columnsWidth);

            // instead of super.doLayout()
            layout();
        }
    }
}