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/**
* Copyright (c) 2012 Mia-Software.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Alban Ménager (Soft-Maint) - Bug 387470 - [EFacet][Custom] Editors
*/
package org.eclipse.emf.facet.util.ui.internal.exported.util.tree.menu;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.emf.facet.util.core.Logger;
import org.eclipse.emf.facet.util.ui.internal.Activator;
import org.eclipse.emf.facet.util.ui.internal.exported.util.tree.item.AbstractTreeItem;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
/**
* Abstract class for the tree menu item. Each Menu Item had an handler which
* provide the methods: <li>{@link #isEnabled()} : return if the menu item has
* to be displayed.</li> <li>{@link #onMenuItemSelection()} : this method will
* be execute when the item is selected.</li> <li>
* {@link #getAssociatedTreeItemClass()} : links this class with an
* {@link AbstractTreeItem}. This item will be instantiate when the user select
* this element on the tree menu.</li>
*
* @see AbstractTreeItem
* @see AbstractTreeMenu
* @since 0.3
*/
public abstract class AbstractTreeMenuItem<T extends Object> extends
AbstractTreeMenu<T> {
private final List<AbstractTreeItem<T>> items;
/**
* Constructor.
*/
public AbstractTreeMenuItem() {
super();
this.items = new LinkedList<AbstractTreeItem<T>>();
}
/**
* This method creates the associated item and set the extra properties to
* it.
*/
@Override
public T onMenuItemSelection() {
AbstractTreeItem<T> item = null;
if (getCurrentItemSelected() == null) {
item = createItem(getTree());
} else {
item = createItem(getCurrentItemSelected());
}
this.getItems().add(item);
item.setExtraProperties(getProperties());
fireChanged();
return item.onItemCreation();
}
/**
* Create a new item {@link TreeItem} into the parent.
*
* @param parent
* the parent of the item to create.
*/
public AbstractTreeItem<T> createItem(final Tree parent) {
return createTreeItem(parent);
}
/**
* Create a new item {@link TreeItem} into the parent.
*
* @param parent
* the parent of the item to create.
*/
public AbstractTreeItem<T> createItem(final TreeItem parent) {
return createTreeItem(parent);
}
/**
* Create a new item {@link TreeItem} into the parent.
*
* @param parent
* the parent of the item to create.
*/
protected AbstractTreeItem<T> createTreeItem(final Object parent) {
AbstractTreeItem<T> newTreeItem = null;
try {
newTreeItem = getAssociatedTreeItemClass().newInstance();
if (parent instanceof Tree) {
newTreeItem.createItem(this, (Tree) parent);
} else if (parent instanceof TreeItem) {
newTreeItem.createItem(this, (TreeItem) parent);
}
} catch (final SecurityException e) {
Logger.logError(e, Activator.getDefault());
} catch (final IllegalArgumentException e) {
Logger.logError(e, Activator.getDefault());
} catch (final InstantiationException e) {
Logger.logError(e, Activator.getDefault());
} catch (final IllegalAccessException e) {
Logger.logError(e, Activator.getDefault());
}
return newTreeItem;
}
/**
* Find the treeItem searching into the all tree.
*
* @param treeItem
* the treeItem to find.
* @return the corresponding {@link AbstractTreeItem}. Null if not.
*/
public AbstractTreeItem<T> findTreeItemExtended(final TreeItem treeItem) {
return this.getTreeMenu().getTreeItemExtended(treeItem);
}
/**
* This method only find the item into the corresponding element of this
* menu item. To find an element searching it into the all tree, use the
* method {@link #findTreeItemExtended(TreeItem)}.
*/
@Override
public AbstractTreeItem<T> getTreeItemExtended(final TreeItem item) {
AbstractTreeItem<T> result = null;
for (final AbstractTreeItem<T> itemExtended : this.getItems()) {
if (itemExtended.getTreeItem().equals(item)) {
result = itemExtended;
break;
}
}
return result;
}
@Override
public boolean removeItem(final TreeItem item) {
boolean removed = false;
final AbstractTreeItem<T> itemExtended = findTreeItemExtended(item);
if (itemExtended != null) {
this.getItems().remove(itemExtended);
itemExtended.removeItem();
removed = true;
fireChanged();
}
return removed;
}
/**
* @return get the current selection of the tree.
*/
public TreeItem getCurrentItemSelected() {
return getTreeMenu().getCurrentItemSelected();
}
/**
* Remove the last item created.
*/
protected void removeLastItem() {
// The list created is a LinkedList<AbstractTreeItem>
((LinkedList<AbstractTreeItem<T>>) this.getItems()).getLast()
.removeItem();
fireChanged();
}
/**
* Set a new text to the last item created.
*
* @param newText
* the new text to set.
*/
protected void setLastItemText(final String newText) {
// The list created is a LinkedList<AbstractTreeItem>
((LinkedList<AbstractTreeItem<T>>) this.getItems()).getLast()
.setTreeItemText(newText);
fireChanged();
}
/**
* When a modification append, this method has to be called and the method
* {@link #notifyChanged()} is called for the listener of this Tree.
*/
public void fireChanged() {
final ExtendedTreeMenu<T> treeMenu = getTreeMenu();
if (treeMenu != null) {
treeMenu.fireChanged();
}
}
/**
* Return the class associated with this menu item. When this menu item will
* be selected, a new instance of this associated {@link AbstractTreeItem}
* will be created.
*
* @return the associated class.
*/
public abstract Class<? extends AbstractTreeItem<T>> getAssociatedTreeItemClass();
/**
* @return the items created by this menu item.
*/
public List<AbstractTreeItem<T>> getItems() {
return this.items;
}
}
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