MachineChooserViewImpl.java

/*******************************************************************************
 * Copyright (c) 2012-2017 Codenvy, S.A.
 * 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:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.ide.machine.chooser;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.KeyCodes;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.PopupPanel;
import com.google.inject.Inject;

import org.eclipse.che.api.core.model.machine.Machine;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Implementation of {@link MachineChooserView} which pops up list of the machines.
 * User can select machine with Enter key or cancel selection with Esc key.
 *
 * @author Artem Zatsarynnyi
 */
public class MachineChooserViewImpl extends PopupPanel implements MachineChooserView {

    private static final MachineChooserViewImplUiBinder UI_BINDER = GWT.create(MachineChooserViewImplUiBinder.class);

    /** Map that contains all shown machines. */
    private final Map<String, Machine> machinesById;

    @UiField
    ListBox machinesList;

    private ActionDelegate delegate;

    @Inject
    public MachineChooserViewImpl() {
        machinesById = new HashMap<>();

        setWidget(UI_BINDER.createAndBindUi(this));

        initView();
        addHandlers();
    }

    private void initView() {
        setAutoHideEnabled(true);
        setAnimationEnabled(true);
        setAnimationType(AnimationType.ROLL_DOWN);
    }

    private void addHandlers() {
        addCloseHandler(event -> {
            if (event.isAutoClosed()) {
                delegate.onCanceled();
            }
        });

        machinesList.addDoubleClickHandler(event -> {
            final String selectedMachineId = machinesList.getSelectedValue();

            if (selectedMachineId != null) {
                final Machine selectedMachine = machinesById.get(selectedMachineId);

                if (selectedMachine != null) {
                    delegate.onMachineSelected(selectedMachine);
                }
            }
        });

        machinesList.addKeyPressHandler(event -> {
            final int keyCode = event.getNativeEvent().getKeyCode();

            if (KeyCodes.KEY_ENTER == keyCode || KeyCodes.KEY_MAC_ENTER == keyCode) {
                final String selectedMachineId = machinesList.getSelectedValue();

                if (selectedMachineId != null) {
                    final Machine selectedMachine = machinesById.get(selectedMachineId);

                    if (selectedMachine != null) {
                        delegate.onMachineSelected(selectedMachine);
                    }
                }
            }
        });

        machinesList.addKeyDownHandler(event -> {
            if (KeyCodes.KEY_ESCAPE == event.getNativeKeyCode()) {
                hide(true);
            }
        });
    }

    @Override
    public void setDelegate(ActionDelegate delegate) {
        this.delegate = delegate;
    }

    @Override
    public void show() {
        super.show();

        center();
        machinesList.setFocus(true);
    }

    @Override
    public void close() {
        hide();
    }

    @Override
    public void setMachines(List<? extends Machine> machines) {
        machinesList.clear();
        machinesById.clear();

        machines.forEach(machine -> {
            machinesById.put(machine.getId(), machine);
            machinesList.addItem(machine.getConfig().getName(), machine.getId());
        });

        machinesList.setVisibleItemCount(machines.size());
        machinesList.setSelectedIndex(0);
    }

    interface MachineChooserViewImplUiBinder extends UiBinder<FlowPanel, MachineChooserViewImpl> {
    }
}