juce/source/extras/Introjucer/Source/Utility/jucer_ValueSourceHelpers.h

   1 /*
   2   ==============================================================================
   3
   4    This file is part of the JUCE library - "Jules' Utility Class Extensions"
   5    Copyright 2004-10 by Raw Material Software Ltd.
   6
   7   ------------------------------------------------------------------------------
   8
   9    JUCE can be redistributed and/or modified under the terms of the GNU General
  10    Public License (Version 2), as published by the Free Software Foundation.
  11    A copy of the license is included in the JUCE distribution, or can be found
  12    online at www.gnu.org/licenses.
  13
  14    JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
  15    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  16    A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
  17
  18   ------------------------------------------------------------------------------
  19
  20    To release a closed-source product which uses JUCE, commercial licenses are
  21    available: visit www.rawmaterialsoftware.com/juce for more information.
  22
  23   ==============================================================================
  24 */
  25
  26 #ifndef __JUCER_VALUEREMAPPERSOURCE_JUCEHEADER__
  27 #define __JUCER_VALUEREMAPPERSOURCE_JUCEHEADER__
  28
  29
  30 //==============================================================================
  31 /**
  32 */
  33 template <typename Type>
  34 class NumericValueSource   : public Value::ValueSource,
  35                              public Value::Listener
  36 {
  37 public:
  38     NumericValueSource (const Value& sourceValue_)
  39        : sourceValue (sourceValue_)
  40     {
  41         sourceValue.addListener (this);
  42     }
  43
  44     void valueChanged (Value&)   { sendChangeMessage (true); }
  45     var getValue() const         { return (Type) sourceValue.getValue(); }
  46
  47     void setValue (const var& newValue)
  48     {
  49         const Type newVal = (Type) newValue;
  50
  51         if (newVal != (Type) getValue())  // this test is important, because if a property is missing, it won't
  52             sourceValue = newVal;        // create it (causing an unwanted undo action) when a control sets it to 0
  53     }
  54
  55     //==============================================================================
  56 protected:
  57     Value sourceValue;
  58
  59     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (NumericValueSource);
  60 };
  61
  62
  63 #endif   // __JUCER_VALUEREMAPPERSOURCE_JUCEHEADER__