根据我的经验,如果 TableView 包含一些固定宽度的列,则 CONSTRAINED_RESIZE_POLICY 会被破坏,除非我在这里做错了什么:
public class JavaFX2Sandbox extends Application
{
public static void main(String[] args)
{
Application.launch(args);
}
@Override
public void start(Stage stage) throws Exception
{
StackPane root = new StackPane();
root.autosize();
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
configureTable(root);
}
public static class Person
{
public Person(String firstName, String lastName)
{
this.fixedValue = "Dr.";
this.firstName = firstName;
this.lastName = lastName;
}
public String fixedValue;
public String firstName;
public String lastName;
}
private static class CellValueFactory<T> implements Callback<TableColumn.CellDataFeatures<T, Object>, ObservableValue<Object>>
{
private String mFieldName;
public CellValueFactory(String fieldName)
{
mFieldName = fieldName;
}
@Override
public ObservableValue call(TableColumn.CellDataFeatures<T, Object> p)
{
try
{
if (p == null)
{
return new SimpleObjectProperty(null);
}
Object o = p.getValue();
if (o == null)
{
return new SimpleObjectProperty(null);
}
Object fieldVal = o.getClass().getField(mFieldName).get(o);
if (fieldVal == null)
{
return new SimpleObjectProperty(null);
}
return new SimpleObjectProperty(fieldVal);
}
catch (Exception ex)
{
return new SimpleObjectProperty(ex);
}
}
}
private void configureTable(StackPane root)
{
TableView<Person> table = new TableView<>();
table.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
ArrayList<Person> teamMembers = new ArrayList<>();
teamMembers.add(new Person("John", "Big"));
teamMembers.add(new Person("Frank", "Small"));
TableColumn col0 = new TableColumn("fixed-width");
col0.setResizable(false);
col0.setCellValueFactory(new CellValueFactory("fixedValue"));
TableColumn col1 = new TableColumn("First Name");
col1.setCellValueFactory(new CellValueFactory("firstName"));
TableColumn col2 = new TableColumn("Last Name");
col2.setCellValueFactory(new CellValueFactory("lastName"));
table.getColumns().setAll(col0, col1, col2);
table.setItems(FXCollections.observableList(teamMembers));
root.getChildren().add(table);
}
}
所以我开始实施我自己的调整大小策略,它的行为与 CONSTRAINED_RESIZE_POLICY 略有不同,但我更喜欢我的 :-)。除了列的宽度之和不等于 TableView 的宽度之外,一切都可以。
这是我的调整大小策略类的实现:
static class ColumnResizePolicy implements Callback<TableView.ResizeFeatures, Boolean>
{
double mTVWidth;
@Override
public Boolean call(ResizeFeatures arg0)
{
TableView tv = arg0.getTable();
Double tvWidth = tv.widthProperty().getValue();
if (tvWidth == null || tvWidth <= 0.0)
{
return false;
}
if (mTVWidth != tvWidth && arg0.getColumn() == null)
{
mTVWidth = tvWidth;
int numColsToSize = 0;
double fixedColumnsWidths = 0;
for (TableColumn col : new ArrayList<TableColumn>(tv.getColumns()))
{
if (col.isResizable() && col.isVisible())
{
++numColsToSize;
}
else if (col.isVisible())
{
fixedColumnsWidths += col.getWidth();
}
}
if (numColsToSize == 0)
return TableView.UNCONSTRAINED_RESIZE_POLICY.call(arg0);
TableColumn lastCol = null;
for (TableColumn col : new ArrayList<TableColumn>(tv.getColumns()))
{
if (col.isResizable() && col.isVisible())
{
double newWidth = (tvWidth - fixedColumnsWidths) / numColsToSize;
col.setPrefWidth(newWidth);
lastCol = col;
}
}
if (lastCol != null)
{
lastCol.setPrefWidth(lastCol.getPrefWidth()-2);
}
return true;
}
else
{
return TableView.UNCONSTRAINED_RESIZE_POLICY.call(arg0);
}
}
}
我的问题(讽刺的是,在这篇长篇文章之后)是关于这一行中的第 2 位:
lastCol.setPrefWidth(lastCol.getPrefWidth()-2);
我假设表格宽度会返回包括边框在内的外部宽度,因此存在差异,但是我如何获得内部宽度?