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package com.vaadin.tests.components.treetable;
import com.vaadin.tests.components.TestBase;
import com.vaadin.ui.Button;
import com.vaadin.v7.data.Item;
import com.vaadin.v7.ui.Tree.CollapseEvent;
import com.vaadin.v7.ui.Tree.CollapseListener;
import com.vaadin.v7.ui.Tree.ExpandEvent;
import com.vaadin.v7.ui.Tree.ExpandListener;
import com.vaadin.v7.ui.TreeTable;
public class KeepAllItemsVisible extends TestBase
implements ExpandListener, CollapseListener {
private static final String CAPTION = "caption";
@Override
protected void setup() {
getMainWindow().getContent().setHeight(null);
final TreeTable tt = new TreeTable();
tt.setWidth("400px");
tt.addContainerProperty(CAPTION, String.class, "");
for (int i = 0; i < 20; i++) {
String id = "Root " + i;
Item item = tt.addItem(id);
item.getItemProperty(CAPTION).setValue(id);
addChildren(tt, id, 5, 2);
}
tt.setSelectable(true);
tt.setImmediate(true);
tt.addListener((ExpandListener) this);
tt.addListener((CollapseListener) this);
tt.addValueChangeListener(event -> {
recalculatePageLength(tt);
tt.markAsDirty();
});
addComponent(tt);
recalculatePageLength(tt);
Button b = new Button("Set pagelength to 10",
event -> tt.setPageLength(10));
addComponent(b);
b = new Button("Set pagelength to 20", event -> tt.setPageLength(20));
addComponent(b);
b = new Button("Set pagelength to 0", event -> tt.setPageLength(0));
addComponent(b);
}
private void recalculatePageLength(TreeTable tt) {
tt.setPageLength(getVisibleNodeCount(tt));
}
private int getVisibleNodeCount(TreeTable tt) {
int count = 0;
for (Object rootId : tt.rootItemIds()) {
count += countVisibleNodes(tt, rootId);
}
return count;
}
private int countVisibleNodes(TreeTable tt, Object node) {
int count = 1;
if (!tt.isCollapsed(node) && tt.hasChildren(node)) {
for (Object childId : tt.getChildren(node)) {
count += countVisibleNodes(tt, childId);
}
}
return count;
}
private void addChildren(TreeTable tt, String parentId, int nr,
int maxNesting) {
if (maxNesting < 1) {
return;
}
for (int i = 1; i <= nr; i++) {
String id = parentId + "/" + i;
Item item = tt.addItem(id);
item.getItemProperty(CAPTION).setValue(id);
tt.setParent(id, parentId);
addChildren(tt, id, nr, maxNesting - 1);
}
}
@Override
protected String getDescription() {
return "Keeps the TreeTable pagelength so that all expanded items are shown.";
}
@Override
protected Integer getTicketNumber() {
return 7292;
}
@Override
public void nodeCollapse(CollapseEvent event) {
recalculatePageLength((TreeTable) event.getSource());
}
@Override
public void nodeExpand(ExpandEvent event) {
recalculatePageLength((TreeTable) event.getSource());
}
}
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