我需要帮助来正确绘制所选行的焦点。目前,如果我选择一个类别的第一项,分隔行也会突出显示。那么如何实现我的自定义焦点绘图,以便只有选定的行被聚焦/突出显示?
我正在使用此处发布的源代码:Blackberry Tablemodel get messed up when scrolling
我正在使用来自 RIM 和 JRE 7.0.0 的 Eclipse IDE
public class ProductsScreen extends MainScreen
{
private TableModel _tableModel;
private static final int ROW_HEIGHT = 40;
public ProductsScreen(MainCategory mc)
{
super(Manager.NO_VERTICAL_SCROLL | Manager.HORIZONTAL_SCROLL);
DBManager dbman = DBManager.getInstance();
AllProductByCategory[] products = null;
try {
products = dbman.getProducts(mc.getID().intValue());
} catch (DatabaseException e) {
System.out.println(e.getMessage());
e.printStackTrace();
} catch (RemoteException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
setTitle(mc.getName());
_tableModel = new TableModel();//(StringComparator.getInstance(true), 0);
if(products != null)
{
for(int i = 0; i < products.length; i++)
{
ViewableData[] data = products[i].getData().getViewableData();
for(int j = 0; j < data.length; j++)
{
_tableModel.addRow(new Object[] {products[i].getCategoryName(), data[j].getTitle2()});
}
}
}
RegionStyles style = new RegionStyles(BorderFactory.createSimpleBorder(new XYEdges(1, 1, 1, 1), Border.STYLE_SOLID), null, null,
null, RegionStyles.ALIGN_LEFT, RegionStyles.ALIGN_TOP);
TableView tableView = new TableView(_tableModel);
final TableController tableController = new TableController(_tableModel, tableView);
tableController.setFocusPolicy(TableController.ROW_FOCUS);
tableController.setCommand(new Command(new CommandHandler()
{
public void execute(ReadOnlyCommandMetadata metadata, Object context)
{
}
}));
tableView.setController(tableController);
DataTemplate dataTemplate = new DataTemplate(tableView, 2, 2)
{
public Field[] getDataFields(int modelRowIndex)
{
final Object[] data = (Object[]) _tableModel.getRow(modelRowIndex);
Field[] fields = new Field[3];
String rowGroup = (String)data[0];
// we're in a new group if this is the very first row, or if this row's
// data[0] value is different from the last row's data[0] value
boolean isNewGroup = (modelRowIndex == 0) ||
(rowGroup.compareTo((String) ((Object[])_tableModel.getRow(modelRowIndex - 1))[0]) != 0);
if (isNewGroup) {
// make a separator row
fields[0] = new HeaderField((String)data[0],
Field.USE_ALL_WIDTH | Field.NON_FOCUSABLE);
} else {
// this is in the same group as the last product, so don't add anything here
fields[0] = new NullField();
}
// now, add the actual product information
fields[1] = new LabelField((String)data[1],
Field.USE_ALL_WIDTH | Field.FOCUSABLE | Field.USE_ALL_HEIGHT | DrawStyle.ELLIPSIS);
fields[2] = new BitmapField(Bitmap.getBitmapResource("img/bullet_arrow_right.png"));
return fields;
}
};
dataTemplate.createRegion(new XYRect(0, 0, 2, 1)); // group separator (maybe a null field)
dataTemplate.createRegion(new XYRect(0, 1, 1, 1)); // actual rows with product information
dataTemplate.createRegion(new XYRect(1, 1, 1, 1));
dataTemplate.setColumnProperties(0, new TemplateColumnProperties(95, TemplateColumnProperties.PERCENTAGE_WIDTH));
dataTemplate.setColumnProperties(1, new TemplateColumnProperties(5, TemplateColumnProperties.PERCENTAGE_WIDTH));
dataTemplate.setRowProperties(0, new TemplateRowProperties(ROW_HEIGHT)); // separator
dataTemplate.setRowProperties(1, new TemplateRowProperties(ROW_HEIGHT)); // product data
dataTemplate.useFixedHeight(false);
tableView.setDataTemplate(dataTemplate);
add(tableView);
}
}
解决方案: 我能够通过以下方法自行解决问题。我只是添加了一个重写的 LabelField 作为 headerfield 并没有实现它的焦点绘制。因此,只有“子字段”才能获得焦点。
也许有些人会以另一种方式实现它(看看 Nate 的答案),但它对我有用。