NumberField.java

/**
 * NumberField.java
 *
 * Copyright (c) 2013-2016, F(X)yz
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *     * Neither the name of F(X)yz, any associated website, nor the
 * names of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL F(X)yz BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

package org.fxyz3d.controls;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import javafx.scene.control.TextField;

/**
 * Define a text field that accept only numbers.
 *
 */
public abstract class NumberField extends TextField {
    // Constants allowed for this editor
    List<String> constants = new ArrayList<>();
    
    public NumberField() {
    }

    public void setConstants(List<String> constants) {
        this.constants.clear();
        this.constants.addAll(constants);
    }
    
    public String getNewText(int start, int end, String text) {
        String oldText = getText();
        String toReplace = oldText.substring(start, end);
        String newText;
        if (toReplace.isEmpty()) {
            // start/end is outside oldText ==> add
            newText = oldText + text;
        } else {
            String headerStr = oldText.substring(0, start);
            String trailerStr = "";
            if (end < oldText.length()) {
                trailerStr = oldText.substring(end, oldText.length());
            }
            newText = headerStr + text + trailerStr;
        }
        return newText;
     }

    protected boolean partOfConstants(String text) {
        // Check if the text is a part of a constant
        text = text.toLowerCase(Locale.ROOT);
        for (String constant : constants) {
            if (constant.toLowerCase(Locale.ROOT).startsWith(text)) {
                return true;
            }
        }
        return false;
    }
}