给SWT的Table添加回车快捷键，支持Cell跳转

这个工具方法提供对Table的EditSupport。支持在Table的任意可编辑cell中，按下回车键，焦点自动跳转到同行的下一个可编辑cell，如果本行没有下一个可编辑的cell，则自动跳转到下一行，焦点在下一行第一个可编辑cell中。

 

实现原理就是监听keyboard事件，然后找到下个可编辑cell，模拟鼠标事件进行跳转。

/** * Tomholmes7 2010.7 * traverse Cr(Enter) Key, to jump from current cell to next editable cell * @param table * @param cellEditors */ public static void traverseCrKeyForTableCellEditors(final Table table,final CellEditor[] cellEditors) { if (cellEditors == null) return; final int columnCount = cellEditors.length; for (int i = 0; i < columnCount; i++) { CellEditor cellEditor = cellEditors[i]; if (cellEditor != null) { if(cellEditor.getControl()==null)continue; cellEditor.getControl().addKeyListener(new KeyAdapter() { public void keyPressed(KeyEvent event) { if (event.keyCode == SWT.CR) { // Current Cell Rectangle Rectangle currentBound = ((Control) event.getSource()).getBounds(); Point currentPoint = new Point(currentBound.x,currentBound.y); // Current Row TableItem currentItem = table.getItem(currentPoint); for (int i = 0; i < columnCount; i++) { // Current Row Rectangle Rectangle currentRowBound = currentItem.getBounds(i); if (currentRowBound.contains(currentPoint)) { int currentRowIndex = table.indexOf(currentItem); int currentColumnIndex = i; // Current Cell 's rowIndex and columIndex System.out.println("Cell Row:" + currentRowIndex + " - Column:" + currentColumnIndex); // Try next cell int nextEditableCellColumnIndex = findNextEditableCellColumn(cellEditors,currentColumnIndex,columnCount); Event origin = new Event(); //1. If next editable cell is in current row if(nextEditableCellColumnIndex>currentColumnIndex){ origin.widget = table; origin.x = 1 + currentPoint.x + getWidthFromCurrentCellToAssignedIndexCellInSameRow(table,currentColumnIndex,nextEditableCellColumnIndex); origin.y = currentPoint.y; origin.display = table.getDisplay(); origin.time = event.time; origin.count = 1; origin.type = SWT.MouseDown; origin.button = 1; } //2. If next editable cell is in next row else if(nextEditableCellColumnIndex<=currentColumnIndex){ origin.widget = table; origin.x = 4 + getWidthFromCurrentCellToAssignedIndexCellInSameRow(table,0,nextEditableCellColumnIndex); origin.y = currentPoint.y + currentBound.height + 1; origin.display = table.getDisplay(); origin.time = event.time; origin.count = 1; origin.type = SWT.MouseDown; origin.button = 1; } //simulate mouse event, jump to next editable cell table.notifyListeners(SWT.MouseDown,origin); } } } } }); } } }

 

下段是焦点定位工具方法：

/** * tomholmes7 * get Width between current column start to assigned column start. * including current cell but not including assigned cell 's width * @param table * @param currentColumnIndex * @param nextEditableCellColumnIndex * @return */ protected static int getWidthFromCurrentCellToAssignedIndexCellInSameRow( Table table, int currentColumnIndex, int assignedColumnIndex) { int width = 0; for(int i=currentColumnIndex;i<assignedColumnIndex;i++){ width = width + table.getColumn(i).getWidth(); } return width; } /** * tomholmes7 * Count from current cell, return next editable cell 's column index. * if no suitable in this row, turn to next row. * @param cellEditors * @param currentColumnIndex * @param columnCount * @return */ protected static int findNextEditableCellColumn(CellEditor[] cellEditors,int currentColumnIndex,int columnCount) { int column = -1; if(currentColumnIndex!=columnCount-1){//If current cell is not in last column for(int j=currentColumnIndex+1;j<columnCount;j++){ if(cellEditors[j]!=null){ column = j; break; } } } if(column == -1){//If current cell is in last column, or no editable cell in current cell's row for(int j=0;j<columnCount;j++){ if(cellEditors[j]!=null){ column = j; break; } } } return column; }