swing 合并单元格的表格

package combineTable; import java.awt.Component; import java.awt.Graphics; import java.awt.Point; import java.awt.Rectangle; import javax.swing.JComponent; import javax.swing.plaf.basic.BasicTableUI; import javax.swing.table.TableCellRenderer; import javax.swing.table.TableColumnModel; class CombineTableUI extends BasicTableUI { @Override public void paint(Graphics g, JComponent c) { Rectangle r = g.getClipBounds(); rendererPane.removeAll(); int firstCol = table.columnAtPoint(new Point(r.x, 0)); int lastCol = table.columnAtPoint(new Point(r.x + r.width, 0)); // -1 is a flag that the ending point is outside the table if (lastCol < 0) { lastCol = table.getColumnCount() - 1; } for (int i = firstCol; i <= lastCol; i++) { paintCol(i, g); } paintGrid(g, 0, table.getRowCount() - 1, 0, table.getColumnCount() - 1); } private void paintCol(int col, Graphics g) { Rectangle r = g.getClipBounds(); for (int i = 0; i < table.getRowCount(); i++) { Rectangle r1 = table.getCellRect(i, col, true); if (r1.intersects(r)) // at least a part is visible { int sk = ((CombineTable) table).combineData.visibleCell(i, col); paintCell(sk, col, g, r1); // increment the column counter i += ((CombineTable) table).combineData.span(sk, col) - 1; } } } private void paintCell(int row, int column, Graphics g, Rectangle area) { int verticalMargin = table.getRowMargin(); int horizontalMargin = table.getColumnModel().getColumnMargin(); area.setBounds(area.x + horizontalMargin / 2, area.y + verticalMargin / 2, area.width - horizontalMargin, area.height - verticalMargin); if (table.isEditing() && table.getEditingRow() == row && table.getEditingColumn() == column) { Component component = table.getEditorComponent(); component.setBounds(area); component.validate(); } else { TableCellRenderer renderer = table.getCellRenderer(row, column); Component component = table.prepareRenderer(renderer, row, column); if (component.getParent() == null) { rendererPane.add(component); } rendererPane.paintComponent(g, component, table, area.x, area.y, area.width, area.height, true); } } private void paintGrid(Graphics g, int rMin, int rMax, int cMin, int cMax) { g.setColor(table.getGridColor()); Rectangle minCell = table.getCellRect(rMin, cMin, true); Rectangle maxCell = table.getCellRect(rMax, cMax, true); Rectangle damagedArea = minCell.union(maxCell); if (table.getShowHorizontalLines()) { CombineData cMap = ((CombineTable) table).combineData; for (int row = rMin; row <= rMax; row++) { for (int column = cMin; column <= cMax; column++) { Rectangle cellRect = table.getCellRect(row, column, true); if (cMap.combineColumns.contains(column)) { int visibleCell = cMap.visibleCell(row, column); int span = cMap.span(row, column); if (span > 1 && row < visibleCell + span - 1) { } else { g.drawLine(cellRect.x, cellRect.y + cellRect.height - 1, cellRect.x + cellRect.width - 1, cellRect.y + cellRect.height - 1); } } else { g.drawLine(cellRect.x, cellRect.y + cellRect.height - 1, cellRect.x + cellRect.width - 1, cellRect.y + cellRect.height - 1); } } } } if (table.getShowVerticalLines()) { TableColumnModel cm = table.getColumnModel(); int tableHeight = damagedArea.y + damagedArea.height; int x; if (table.getComponentOrientation().isLeftToRight()) { x = damagedArea.x; for (int column = cMin; column <= cMax; column++) { int w = cm.getColumn(column).getWidth(); x += w; g.drawLine(x - 1, 0, x - 1, tableHeight - 1); } } else { x = damagedArea.x; for (int column = cMax; column >= cMin; column--) { int w = cm.getColumn(column).getWidth(); x += w; g.drawLine(x - 1, 0, x - 1, tableHeight - 1); } } } } }