1*aaef562fSAndrew Rist /**************************************************************
2cdf0e10cSrcweir  *
3*aaef562fSAndrew Rist  * Licensed to the Apache Software Foundation (ASF) under one
4*aaef562fSAndrew Rist  * or more contributor license agreements.  See the NOTICE file
5*aaef562fSAndrew Rist  * distributed with this work for additional information
6*aaef562fSAndrew Rist  * regarding copyright ownership.  The ASF licenses this file
7*aaef562fSAndrew Rist  * to you under the Apache License, Version 2.0 (the
8*aaef562fSAndrew Rist  * "License"); you may not use this file except in compliance
9*aaef562fSAndrew Rist  * with the License.  You may obtain a copy of the License at
10*aaef562fSAndrew Rist  *
11*aaef562fSAndrew Rist  *   http://www.apache.org/licenses/LICENSE-2.0
12*aaef562fSAndrew Rist  *
13*aaef562fSAndrew Rist  * Unless required by applicable law or agreed to in writing,
14*aaef562fSAndrew Rist  * software distributed under the License is distributed on an
15*aaef562fSAndrew Rist  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16*aaef562fSAndrew Rist  * KIND, either express or implied.  See the License for the
17*aaef562fSAndrew Rist  * specific language governing permissions and limitations
18*aaef562fSAndrew Rist  * under the License.
19*aaef562fSAndrew Rist  *
20*aaef562fSAndrew Rist  *************************************************************/
21*aaef562fSAndrew Rist 
22*aaef562fSAndrew Rist 
23cdf0e10cSrcweir 
24cdf0e10cSrcweir #ifndef INCLUDED_SLIDESHOW_BOOLANIMATION_HXX
25cdf0e10cSrcweir #define INCLUDED_SLIDESHOW_BOOLANIMATION_HXX
26cdf0e10cSrcweir 
27cdf0e10cSrcweir #include "animation.hxx"
28cdf0e10cSrcweir 
29cdf0e10cSrcweir 
30cdf0e10cSrcweir /* Definition of BoolAnimation interface */
31cdf0e10cSrcweir 
32cdf0e10cSrcweir namespace slideshow
33cdf0e10cSrcweir {
34cdf0e10cSrcweir     namespace internal
35cdf0e10cSrcweir     {
36cdf0e10cSrcweir         /** Interface defining a bool animation.
37cdf0e10cSrcweir 
38cdf0e10cSrcweir         	This interface is a specialization of the Animation
39cdf0e10cSrcweir         	interface, and is used to animate attributes that have
40cdf0e10cSrcweir         	only two discrete values (on and off, or true and false,
41cdf0e10cSrcweir         	for example).
42cdf0e10cSrcweir          */
43cdf0e10cSrcweir         class BoolAnimation : public Animation
44cdf0e10cSrcweir         {
45cdf0e10cSrcweir         public:
46cdf0e10cSrcweir             typedef bool ValueType;
47cdf0e10cSrcweir 
48cdf0e10cSrcweir             /** Set the animation to the given value
49cdf0e10cSrcweir 
50cdf0e10cSrcweir                 @param bValue
51cdf0e10cSrcweir                 Current animation value.
52cdf0e10cSrcweir              */
53cdf0e10cSrcweir             virtual bool operator()( ValueType bValue ) = 0;
54cdf0e10cSrcweir 
55cdf0e10cSrcweir             /** Request the underlying value for this animation.
56cdf0e10cSrcweir 
57cdf0e10cSrcweir             	This is necessary for pure To or By animations, as the
58cdf0e10cSrcweir             	Activity cannot determine a sensible start value
59cdf0e10cSrcweir             	otherwise.
60cdf0e10cSrcweir 
61cdf0e10cSrcweir                 @attention Note that you are only permitted to query
62cdf0e10cSrcweir                 for the underlying value, if the animation has actually
63cdf0e10cSrcweir                 been started (via start() call).
64cdf0e10cSrcweir              */
65cdf0e10cSrcweir             virtual ValueType getUnderlyingValue() const = 0;
66cdf0e10cSrcweir         };
67cdf0e10cSrcweir 
68cdf0e10cSrcweir         typedef ::boost::shared_ptr< BoolAnimation > BoolAnimationSharedPtr;
69cdf0e10cSrcweir 
70cdf0e10cSrcweir     }
71cdf0e10cSrcweir }
72cdf0e10cSrcweir 
73cdf0e10cSrcweir #endif /* INCLUDED_SLIDESHOW_BOOLANIMATION_HXX */
74