uk.ac.stfc.isis.ibex.ui.widgets.observable.WritableObservingTextBox.java Source code

Introduction

Here is the source code for uk.ac.stfc.isis.ibex.ui.widgets.observable.WritableObservingTextBox.java

Source

/*
* This file is part of the ISIS IBEX application.
* Copyright (C) 2012-2015 Science & Technology Facilities Council.
* All rights reserved.
*
* This program is distributed in the hope that it will be useful.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution.
* EXCEPT AS EXPRESSLY SET FORTH IN THE ECLIPSE PUBLIC LICENSE V1.0, THE PROGRAM 
* AND ACCOMPANYING MATERIALS ARE PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES 
* OR CONDITIONS OF ANY KIND.  See the Eclipse Public License v1.0 for more details.
*
* You should have received a copy of the Eclipse Public License v1.0
* along with this program; if not, you can obtain a copy from
* https://www.eclipse.org/org/documents/epl-v10.php or 
* http://opensource.org/licenses/eclipse-1.0.php
*/

package uk.ac.stfc.isis.ibex.ui.widgets.observable;

import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.beans.BeanProperties;
import org.eclipse.jface.databinding.swt.WidgetProperties;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Text;
import org.eclipse.wb.swt.SWTResourceManager;

/**
 * A text box for displaying and editing a record.
 */
@SuppressWarnings("checkstyle:magicnumber")
public class WritableObservingTextBox extends Composite {

    private DataBindingContext bindingContext;

    private final Text textbox;
    private final Button setButton;

    public WritableObservingTextBox(Composite parent, int style, StringWritableObservableAdapter adapter) {
        super(parent, style);
        int numCols = (style & SWT.UP) != 0 ? 1 : 2;
        GridLayout gridLayout = new GridLayout(numCols, false);
        gridLayout.marginWidth = 0;
        gridLayout.marginHeight = 0;
        setLayout(gridLayout);
        textbox = new Text(this, SWT.BORDER);
        textbox.setFont(SWTResourceManager.getFont("Arial", 12, SWT.NORMAL));
        textbox.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 1, 1));

        setButton = new Button(this, SWT.NONE);
        GridData gdSetButton = new GridData(SWT.LEFT, SWT.CENTER, false, false, 1, 1);
        gdSetButton.widthHint = 50;
        setButton.setLayoutData(gdSetButton);
        setButton.setText("Set");

        if (adapter != null) {
            bind(adapter);
        }
    }

    private void bind(final StringWritableObservableAdapter adapter) {
        bindingContext = new DataBindingContext();
        bindingContext.bindValue(WidgetProperties.enabled().observe(setButton),
                BeanProperties.value("value").observe(adapter.canSetText()));
        bindingContext.bindValue(WidgetProperties.enabled().observe(textbox),
                BeanProperties.value("value").observe(adapter.canSetText()));
        bindingContext.bindValue(WidgetProperties.text().observe(textbox),
                BeanProperties.value("value").observe(adapter.text()));

        textbox.addListener(SWT.Traverse, new Listener() {
            @Override
            public void handleEvent(Event event) {
                if (event.detail == SWT.TRAVERSE_RETURN) {
                    uncheckedSetText(adapter);
                }
            }
        });

        setButton.addSelectionListener(new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
                super.widgetSelected(e);
                uncheckedSetText(adapter);
            }
        });
    }

    private void uncheckedSetText(StringWritableObservableAdapter adapter) {
        adapter.uncheckedSetText(textbox.getText());
    }
}