org.eclipse.jface.snippets.viewers.Snippet053StartEditorWithContextMenu.java Source code

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Here is the source code for org.eclipse.jface.snippets.viewers.Snippet053StartEditorWithContextMenu.java

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/*******************************************************************************
 * Copyright (c) 2007, 2015 Marcel and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Marcel <emmpeegee@gmail.com> - initial API and implementation
 *     Jeanderson Candido <http://jeandersonbc.github.io> - Bug 414565
 *     Simon Scholz <simon.scholz@vogella.com> - Bug 442343, 442747
 *     Lars Vogel <Lars.Vogel@vogella.com> - Bug 442278, 475361
 *     Wim Jongman <wim.jongman@remainsoftware.com> - Added doc and made stable
 *******************************************************************************/
package org.eclipse.jface.snippets.viewers;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.CellEditor;
import org.eclipse.jface.viewers.ColumnLabelProvider;
import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.ColumnViewerEditor;
import org.eclipse.jface.viewers.ColumnViewerEditorActivationEvent;
import org.eclipse.jface.viewers.ColumnViewerEditorActivationStrategy;
import org.eclipse.jface.viewers.EditingSupport;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.TextCellEditor;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.TreeViewerColumn;
import org.eclipse.jface.viewers.TreeViewerEditor;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;

/**
 * Demonstrates how you can start editing a cell after selecting a context menu.
 */
public class Snippet053StartEditorWithContextMenu extends SelectionAdapter {

    private TreeViewer viewer;

    private class MyContentProvider implements ITreeContentProvider {

        @Override
        public Object[] getElements(Object inputElement) {
            return ((MyModel) inputElement).child.toArray();
        }

        @Override
        public void dispose() {

        }

        @Override
        public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {

        }

        @Override
        public Object[] getChildren(Object parentElement) {
            return getElements(parentElement);
        }

        @Override
        public Object getParent(Object element) {
            if (element == null) {
                return null;
            }
            return ((MyModel) element).parent;
        }

        @Override
        public boolean hasChildren(Object element) {
            return ((MyModel) element).child.size() > 0;
        }

    }

    public class MyModel {
        public MyModel parent;

        public List<MyModel> child = new ArrayList<>();

        public int counter;

        public MyModel(int counter, MyModel parent) {
            this.parent = parent;
            this.counter = counter;
        }

        @Override
        public String toString() {
            String rv = "Item ";
            if (parent != null) {
                rv = parent + ".";
            }
            rv += counter;

            return rv;
        }
    }

    public class MyEditingSupport extends EditingSupport {

        public MyEditingSupport(ColumnViewer viewer) {
            super(viewer);
        }

        @Override
        protected CellEditor getCellEditor(Object element) {
            return new TextCellEditor((Composite) getViewer().getControl());
        }

        @Override
        protected boolean canEdit(Object element) {
            return true;
        }

        @Override
        protected Object getValue(Object element) {
            return ((MyModel) element).counter + "";
        }

        @Override
        protected void setValue(Object element, Object value) {
            try {
                ((MyModel) element).counter = Integer.parseInt(value.toString());
                getViewer().update(element, null);
            } catch (Exception e) {
                MessageDialog.openError(viewer.getControl().getShell(), "Oops", "We only accept numbers..");
            }

        }
    }

    public Snippet053StartEditorWithContextMenu(Shell shell) {
        viewer = new TreeViewer(shell, SWT.BORDER);
        viewer.setContentProvider(new MyContentProvider());

        TreeViewerColumn viewerColumn = new TreeViewerColumn(viewer, SWT.NONE);
        viewerColumn.getColumn().setWidth(200);

        viewerColumn.setEditingSupport(new MyEditingSupport(viewer));
        viewerColumn.setLabelProvider(new ColumnLabelProvider());

        TreeViewerEditor.create(viewer, new ColumnViewerEditorActivationStrategy(viewer) {
            @Override
            protected boolean isEditorActivationEvent(ColumnViewerEditorActivationEvent event) {
                return event.eventType == ColumnViewerEditorActivationEvent.PROGRAMMATIC;
            }
        }, ColumnViewerEditor.DEFAULT);

        Menu menu = new Menu(viewer.getControl());
        MenuItem renameItem = new MenuItem(menu, SWT.PUSH);
        renameItem.addSelectionListener(this);
        renameItem.setText("Rename");
        viewer.getTree().setMenu(menu);

        viewer.setInput(createModel());
    }

    @Override
    public void widgetSelected(SelectionEvent e) {
        IStructuredSelection selection = viewer.getStructuredSelection();
        if (!selection.isEmpty()) {
            viewer.editElement(selection.getFirstElement(), 0);
        }
    }

    private MyModel createModel() {

        MyModel root = new MyModel(0, null);
        root.counter = 0;

        MyModel tmp;
        for (int i = 1; i < 10; i++) {
            tmp = new MyModel(i, root);
            root.child.add(tmp);
            for (int j = 1; j < i; j++) {
                tmp.child.add(new MyModel(j, tmp));
            }
        }

        return root;
    }

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        new Snippet053StartEditorWithContextMenu(shell);
        shell.open();

        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }

        display.dispose();
    }
}