com.amitinside.e4.rcp.todo.parts.TodoDeletionPart.java Source code

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Here is the source code for com.amitinside.e4.rcp.todo.parts.TodoDeletionPart.java

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/*******************************************************************************
 * Copyright (C) 2015 - Amit Kumar Mondal <admin@amitinside.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.amitinside.e4.rcp.todo.parts;

import java.util.List;

import javax.annotation.PostConstruct;
import javax.inject.Inject;

import org.eclipse.core.commands.ParameterizedCommand;
import org.eclipse.e4.core.commands.ECommandService;
import org.eclipse.e4.core.commands.EHandlerService;
import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.core.di.annotations.Optional;
import org.eclipse.e4.core.services.nls.ILocaleChangeService;
import org.eclipse.e4.core.services.nls.Translation;
import org.eclipse.e4.ui.di.Focus;
import org.eclipse.e4.ui.di.UIEventTopic;
import org.eclipse.e4.ui.workbench.modeling.ESelectionService;
import org.eclipse.jface.viewers.ArrayContentProvider;
import org.eclipse.jface.viewers.ComboViewer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;

import com.amitinside.e4.rcp.todo.events.MyEventConstants;
import com.amitinside.e4.rcp.todo.i18n.Messages;
import com.amitinside.e4.rcp.todo.model.ITodoService;
import com.amitinside.e4.rcp.todo.model.Todo;

public class TodoDeletionPart {
    @Inject
    private ITodoService model;

    @Inject
    ESelectionService selectionService;

    @Inject
    @Translation
    Messages messages;

    @Inject
    ILocaleChangeService localeChangeService;

    @Inject
    EHandlerService handlerService;
    @Inject
    ECommandService commandService;
    @Inject
    IEclipseContext ctx;

    private ComboViewer viewer;

    @PostConstruct
    public void createControls(Composite parent) {
        parent.setLayout(new GridLayout(2, false));
        viewer = new ComboViewer(parent, SWT.READ_ONLY);
        viewer.setLabelProvider(new LabelProvider() {
            @Override
            public String getText(Object element) {
                Todo todo = (Todo) element;
                return todo.getSummary();
            }
        });
        viewer.setContentProvider(ArrayContentProvider.getInstance());

        List<Todo> todos = model.getTodos();
        updateViewer(todos);

        Button button = new Button(parent, SWT.PUSH);
        button.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                ISelection selection = viewer.getSelection();
                IStructuredSelection sel = (IStructuredSelection) selection;
                if (sel.size() > 0) {
                    selectionService.setSelection(sel.getFirstElement());
                    // assure that "com.example.e4.rcp.todo.remove" is the ID
                    // of the command which deletes todos in your application model
                    ParameterizedCommand cmd = commandService.createCommand("com.example.e4.rcp.todo.remove", null);
                    handlerService.executeHandler(cmd, ctx);
                }

            }
        });
        button.setText(messages.TodoDeletionPart_0);
    }

    private void updateViewer(List<Todo> todos) {
        viewer.setInput(todos);
        if (todos.size() > 0) {
            viewer.setSelection(new StructuredSelection(todos.get(0)));
        }
    }

    @Inject
    @Optional
    private void getNotified(@UIEventTopic(MyEventConstants.TOPIC_TODO_ALLTOPICS) Todo todo) {
        updateViewer(model.getTodos());
    }

    @Focus
    public void focus() {
        viewer.getControl().setFocus();
    }
}