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package com.itmill.toolkit.demo.sampler.features.trees;
import java.util.Iterator;
import java.util.Set;
import com.itmill.toolkit.data.Item;
import com.itmill.toolkit.data.Property.ValueChangeEvent;
import com.itmill.toolkit.data.Property.ValueChangeListener;
import com.itmill.toolkit.demo.sampler.ExampleUtil;
import com.itmill.toolkit.event.Action;
import com.itmill.toolkit.ui.AbstractSelect;
import com.itmill.toolkit.ui.Button;
import com.itmill.toolkit.ui.Tree;
import com.itmill.toolkit.ui.VerticalLayout;
import com.itmill.toolkit.ui.Button.ClickEvent;
public class TreeMultiSelectExample extends VerticalLayout implements
Action.Handler {
private static final Action ACTION_ADD = new Action("Add child item");
private static final Action ACTION_DELETE = new Action("Delete");
private static final Action[] ACTIONS = new Action[] { ACTION_ADD,
ACTION_DELETE };
private Tree tree;
private Button deleteButton;
public TreeMultiSelectExample() {
setSpacing(true);
// Create new Tree object using a hierarchical container from
// ExampleUtil class
tree = new Tree("Hardware Inventory", ExampleUtil
.getHardwareContainer());
// Set multiselect mode
tree.setMultiSelect(true);
tree.setImmediate(true);
tree.addListener(new ValueChangeListener() {
public void valueChange(ValueChangeEvent event) {
Tree t = (Tree) event.getProperty();
// enable if something is selected, returns a set
deleteButton.setEnabled(t.getValue() != null
&& ((Set) t.getValue()).size() > 0);
}
});
// Add Actionhandler
tree.addActionHandler(this);
// Set tree to show the 'name' property as caption for items
tree.setItemCaptionPropertyId(ExampleUtil.hw_PROPERTY_NAME);
tree.setItemCaptionMode(AbstractSelect.ITEM_CAPTION_MODE_PROPERTY);
// Expand whole tree
for (Iterator it = tree.rootItemIds().iterator(); it.hasNext();) {
tree.expandItemsRecursively(it.next());
}
// Create the 'delete button', inline click-listener
deleteButton = new Button("Delete", new Button.ClickListener() {
public void buttonClick(ClickEvent event) {
// Delete all the selected objects
Object[] toDelete = ((Set<Object>) tree.getValue()).toArray();
for (int i = 0; i < toDelete.length; i++) {
handleAction(ACTION_DELETE, tree, toDelete[i]);
}
}
});
deleteButton.setEnabled(false);
addComponent(deleteButton);
addComponent(tree);
}
/*
* Returns the set of available actions
*/
public Action[] getActions(Object target, Object sender) {
return ACTIONS;
}
/*
* Handle actions
*/
public void handleAction(Action action, Object sender, Object target) {
if (action == ACTION_ADD) {
// Allow children for the target item
tree.setChildrenAllowed(target, true);
// Create new item, disallow children, add name, set parent
Object itemId = tree.addItem();
tree.setChildrenAllowed(itemId, false);
String newItemName = "New Item # " + itemId;
Item item = tree.getItem(itemId);
item.getItemProperty(ExampleUtil.hw_PROPERTY_NAME).setValue(
newItemName);
tree.setParent(itemId, target);
tree.expandItem(target);
} else if (action == ACTION_DELETE) {
Object parent = tree.getParent(target);
tree.removeItem(target);
// If the deleted object's parent has no more children, set it's
// childrenallowed property to false
if (parent != null && tree.getChildren(parent).size() == 0) {
tree.setChildrenAllowed(parent, false);
}
}
}
}
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