1 /*
   2  * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package com.sun.javafx.scene.control.skin;
  27 
  28 import com.sun.javafx.scene.control.DoubleField;
  29 import javafx.application.Platform;
  30 import javafx.beans.InvalidationListener;
  31 import javafx.scene.Node;
  32 
  33 /**
  34  */
  35 public class DoubleFieldSkin extends InputFieldSkin {
  36     private InvalidationListener doubleFieldValueListener;
  37 
  38     /**
  39      * Create a new DoubleFieldSkin.
  40      * @param control The DoubleField
  41      */
  42     public DoubleFieldSkin(final DoubleField control) {
  43         super(control);
  44 
  45         // Whenever the value changes on the control, we need to update the text
  46         // in the TextField. The only time this is not the case is when the update
  47         // to the control happened as a result of an update in the text textField.
  48         control.valueProperty().addListener(doubleFieldValueListener = observable -> {
  49             updateText();
  50         });
  51     }
  52 
  53     @Override public DoubleField getSkinnable() {
  54         return (DoubleField) control;
  55     }
  56 
  57     @Override public Node getNode() {
  58         return getTextField();
  59     }
  60 
  61     /**
  62      * Called by a Skinnable when the Skin is replaced on the Skinnable. This method
  63      * allows a Skin to implement any logic necessary to clean up itself after
  64      * the Skin is no longer needed. It may be used to release native resources.
  65      * The methods {@link #getSkinnable()} and {@link #getNode()}
  66      * should return null following a call to dispose. Calling dispose twice
  67      * has no effect.
  68      */
  69     @Override
  70     public void dispose() {
  71         ((DoubleField) control).valueProperty().removeListener(doubleFieldValueListener);
  72         super.dispose();
  73     }
  74 
  75     protected boolean accept(String text) {
  76         if (text.length() == 0) return true;
  77         if (text.matches("[0-9\\.]*")) {
  78             try {
  79                 Double.parseDouble(text);
  80                 return true;
  81             } catch (NumberFormatException ex) { }
  82         }
  83         return false;
  84     }
  85 
  86     protected void updateText() {
  87         getTextField().setText("" + ((DoubleField) control).getValue());
  88     }
  89 
  90     protected void updateValue() {
  91         double value = ((DoubleField) control).getValue();
  92         double newValue;
  93         String text = getTextField().getText() == null ? "" : getTextField().getText().trim();
  94         try {
  95             newValue = Double.parseDouble(text);
  96             if (newValue != value) {
  97                 ((DoubleField) control).setValue(newValue);
  98             }
  99         } catch (NumberFormatException ex) {
 100             // Empty string most likely
 101             ((DoubleField) control).setValue(0);
 102             Platform.runLater(() -> {
 103                 getTextField().positionCaret(1);
 104             });
 105         }
 106     }
 107 }