目前我在 Vaadin Table 方面遇到了相当奇怪的问题。如果我使用 AbsoluteLayout,表中的数据不会显示,但如果我使用 HorizontalLayout,数据就会完美显示。 这有效:
import com.vaadin.annotations.AutoGenerated;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Table;
public class MyComposite extends CustomComponent {
@AutoGenerated
private HorizontalLayout mainLayout;
@AutoGenerated
private Table table;
public MyComposite() {
buildMainLayout();
setCompositionRoot(mainLayout);
// TODO add user code here
table.addContainerProperty("First Name", String.class, null);
table.addContainerProperty("Last Name", String.class, null);
table.addContainerProperty("Year", Integer.class, null);
table.addItem(new Object[] { "Nicolaus", "Copernicus",
new Integer(1473) }, new Integer(1));
table.addItem(new Object[] { "Tycho", "Brahe", new Integer(1546) },
new Integer(2));
}
@AutoGenerated
private HorizontalLayout buildMainLayout() {
// common part: create layout
mainLayout = new HorizontalLayout();
mainLayout.setStyleName("blue");
mainLayout.setImmediate(false);
mainLayout.setWidth("100%");
mainLayout.setHeight("100%");
mainLayout.setMargin(false);
// top-level component properties
setWidth("100.0%");
setHeight("100.0%");
// table
table = new Table();
table.setImmediate(false);
table.setWidth("100.0%");
table.setHeight("100.0%");
mainLayout.addComponent(table);
return mainLayout;
}
}
但这不是:
import com.vaadin.annotations.AutoGenerated;
import com.vaadin.ui.AbsoluteLayout;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.Table;
public class MyComposite extends CustomComponent {
@AutoGenerated
private AbsoluteLayout mainLayout;
@AutoGenerated
private Table table;
public MyComposite() {
buildMainLayout();
setCompositionRoot(mainLayout);
// TODO add user code here
table.addContainerProperty("First Name", String.class, null);
table.addContainerProperty("Last Name", String.class, null);
table.addContainerProperty("Year", Integer.class, null);
table.addItem(new Object[] { "Nicolaus", "Copernicus",
new Integer(1473) }, new Integer(1));
table.addItem(new Object[] { "Tycho", "Brahe", new Integer(1546) },
new Integer(2));
}
@AutoGenerated
private AbsoluteLayout buildMainLayout() {
// common part: create layout
mainLayout = new AbsoluteLayout();
mainLayout.setStyleName("blue");
mainLayout.setImmediate(false);
mainLayout.setWidth("100%");
mainLayout.setHeight("100%");
// top-level component properties
setWidth("100.0%");
setHeight("100.0%");
// table
table = new Table();
table.setImmediate(false);
table.setWidth("100.0%");
table.setHeight("100.0%");
mainLayout.addComponent(table);
return mainLayout;
}
}
两种情况下都会显示列名称。有人能告诉我为什么会发生这种情况吗?提前致谢。
最佳答案
我能够重现您的问题。 Vaadin 的人似乎在这里描述了原因: Vaadin book
引用:
A layout that contains components with percentual size must have a defined size!
If a layout has undefined size and a contained component has, say, 100% size, the component will try to fill the space given by the layout, while the layout will shrink to fit the space taken by the component, which is a paradox. This requirement holds for height and width separately. The debug mode allows detecting such invalid cases; see Section 11.3.5, “Inspecting Component Hierarchy”
对于 AbsoluteLayout,到目前为止,我发现的唯一解决方法是将表格尺寸设置为一些固定值。
关于java - Vaadin - 如果我使用 AbsoluteLayout,则不会显示表数据,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/23082371/