org.rstudio.core.client.widget.NumericTextBox.java Source code

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Here is the source code for org.rstudio.core.client.widget.NumericTextBox.java

Source

/*
 * NumericTextBox.java
 *
 * Copyright (C) 2009-12 by RStudio, Inc.
 *
 * Unless you have received this program directly from RStudio pursuant
 * to the terms of a commercial license agreement with RStudio, then
 * this program is licensed to you under the terms of version 3 of the
 * GNU Affero General Public License. This program is distributed WITHOUT
 * ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING THOSE OF NON-INFRINGEMENT,
 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Please refer to the
 * AGPL (http://www.gnu.org/licenses/agpl-3.0.txt) for more details.
 *
 */
package org.rstudio.core.client.widget;

import com.google.gwt.dom.client.Element;
import com.google.gwt.event.dom.client.*;
import com.google.gwt.user.client.ui.TextBox;
import org.rstudio.core.client.command.KeyboardShortcut;

public class NumericTextBox extends TextBox {
    public NumericTextBox() {
        super();
        init();
    }

    protected NumericTextBox(Element element) {
        super(element);
        init();
    }

    private void init() {
        addFocusHandler(new FocusHandler() {
            @Override
            public void onFocus(FocusEvent event) {
                selectAll();
            }
        });

        addKeyDownHandler(new KeyDownHandler() {
            @Override
            public void onKeyDown(KeyDownEvent event) {
                int modifiers = KeyboardShortcut.getModifierValue(event.getNativeEvent());
                if (modifiers == KeyboardShortcut.NONE && (event.isUpArrow() || event.isDownArrow())) {
                    event.preventDefault();
                    event.stopPropagation();

                    try {
                        int value = Integer.parseInt(getText());
                        value += event.isUpArrow() ? 1 : -1;
                        setValue(value + "", true);
                        selectAll();
                    } catch (NumberFormatException nfe) {
                        // just ignore
                    }
                }
            }
        });

        addKeyPressHandler(new KeyPressHandler() {
            @Override
            public void onKeyPress(KeyPressEvent event) {
                char charCode = event.getCharCode();
                if (charCode >= '0' && charCode <= '9')
                    return;
                if (Character.isLetterOrDigit(charCode))
                    event.preventDefault();
            }
        });
    }
}