eu.numberfour.n4js.ui.navigator.internal.N4JSWorkingSetActionProvider.java Source code

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Here is the source code for eu.numberfour.n4js.ui.navigator.internal.N4JSWorkingSetActionProvider.java

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/**
 * Copyright (c) 2016 NumberFour AG.
 * 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:
 *   NumberFour AG - Initial API and implementation
 */
package eu.numberfour.n4js.ui.navigator.internal;

import org.eclipse.jface.action.ActionContributionItem;
import org.eclipse.jface.action.IMenuManager;
import org.eclipse.jface.action.IToolBarManager;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.IMemento;
import org.eclipse.ui.internal.navigator.resources.actions.WorkingSetActionProvider;
import org.eclipse.ui.navigator.ICommonActionExtensionSite;

import com.google.inject.Inject;

import eu.numberfour.n4js.ui.workingsets.TopLevelElementChangedListener;
import eu.numberfour.n4js.ui.workingsets.WorkingSet;
import eu.numberfour.n4js.ui.workingsets.WorkingSetManager;
import eu.numberfour.n4js.ui.workingsets.WorkingSetManagerBroker;
import eu.numberfour.n4js.ui.workingsets.WorkingSetManagerStateChangedListener;
import eu.numberfour.n4js.utils.Diff;

/**
 * Customized working set provider for the CNF (Common Navigator Framework).
 */
@SuppressWarnings("restriction")
public class N4JSWorkingSetActionProvider extends WorkingSetActionProvider
        implements TopLevelElementChangedListener, WorkingSetManagerStateChangedListener {

    @Inject
    private SelectWorkingSetDropDownAction selectWorkingSetAction;

    @Inject
    private SelectTopLevelElementActionGroup selectTopLevelElementAction;

    @Inject
    private ShowHiddenWorkingSetsDropDownAction showHiddenWorkingSetsAction;

    @Inject
    private WorkingSetManagerBroker workingSetManagerBroker;

    private IActionBars actionBars;
    private boolean alreadyContributedToViewer;
    private ActionContributionItem selectWorkingSetDelegate;
    private ActionContributionItem showHiddenWorkingSetsDelegate;

    @Override
    public void init(final ICommonActionExtensionSite site) {
        selectWorkingSetDelegate = new ActionContributionItem(selectWorkingSetAction);
        showHiddenWorkingSetsDelegate = new ActionContributionItem(showHiddenWorkingSetsAction);
        workingSetManagerBroker.addTopLevelElementChangedListener(this);
        workingSetManagerBroker.addWorkingSetManagerStateChangedListener(this);
    }

    @Override
    public void fillActionBars(@SuppressWarnings("hiding") final IActionBars actionBars) {
        if (!alreadyContributedToViewer) {
            this.actionBars = actionBars;
            try {
                topLevelElementChanged(workingSetManagerBroker.isWorkingSetTopLevel());
            } finally {
                alreadyContributedToViewer = true;
            }
        }
    }

    @Override
    public void fillContextMenu(final IMenuManager menu) {
        // Disables the default one.
    }

    @Override
    public void restoreState(final IMemento aMemento) {
        // Nothing to restore.
    }

    @Override
    public void saveState(final IMemento aMemento) {
        // Nothing to save.
    }

    @Override
    public void dispose() {
        if (selectWorkingSetAction != null) {
            selectWorkingSetAction.dispose();
        }
        workingSetManagerBroker.removeTopLevelElementChangedListener(this);
    }

    @Override
    public void topLevelElementChanged(final boolean workingSetTopLevel) {
        if (actionBars != null) {
            final IToolBarManager toolBarManager = actionBars.getToolBarManager();
            toolBarManager.remove(selectWorkingSetDelegate);
            toolBarManager.remove(showHiddenWorkingSetsDelegate);
            if (workingSetManagerBroker.isWorkingSetTopLevel()) {
                toolBarManager.add(selectWorkingSetDelegate);
                final WorkingSetManager manager = workingSetManagerBroker.getActiveManager();
                if (manager != null) {
                    WorkingSet[] allItems = manager.getAllWorkingSets();
                    WorkingSet[] items = manager.getWorkingSets();
                    updateShowHiddenAction(allItems, items);
                }
            }
            selectTopLevelElementAction.fillActionBars(actionBars);
            actionBars.updateActionBars();
        }
    }

    @Override
    public void workingSetManagerStateChanged(final WorkingSetManagerChangeEvent event) {

        final Diff<WorkingSet> diff = event.getDiff();
        final WorkingSetManager activeManager = workingSetManagerBroker.getActiveManager();
        final String changedId = event.getId();

        if (actionBars != null && activeManager != null && !diff.isEmpty()
                && workingSetManagerBroker.isWorkingSetTopLevel() && activeManager.getId().equals(changedId)) {

            final WorkingSet[] allItems = diff.getNewAllItems();
            final WorkingSet[] items = diff.getNewItems();
            updateShowHiddenAction(allItems, items);
            actionBars.updateActionBars();
        }
    }

    private void updateShowHiddenAction(final WorkingSet[] allItems, final WorkingSet[] items) {
        final IToolBarManager toolBarManager = actionBars.getToolBarManager();
        toolBarManager.remove(showHiddenWorkingSetsDelegate);
        if (allItems.length > items.length) {
            toolBarManager.add(showHiddenWorkingSetsDelegate);
        }
    }

}