1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
/*
* QSwitcher.h
*
* Created by Christophe Daudin on 12/05/09.
* Copyright 2009 Grame. All rights reserved.
*
* GNU Lesser General Public License Usage
* Alternatively, this file may be used under the terms of the GNU Lesser
* General Public License version 2.1 as published by the Free Software
* Foundation and appearing in the file LICENSE.LGPL included in the
* packaging of this file. Please review the following information to
* ensure the GNU Lesser General Public License version 2.1 requirements
* will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
*
*
* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
* WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef SWITCHER_H
#define SWITCHER_H
#include <QObject>
//#include <QGraphicsRectItem>
//#include <QPen>
//#include <QBrush>
#include <QMap>
#include <QList>
#include <QtDebug>
/*!
* \brief A class to determine, among a set of T objects, which one is "active", using flags and switches.
*
* The QSwitcher has 2 types of variable :
* - flags :
* - You can set a flag "on" or "off" with QSwitcher::setFlag(int flagId, bool isOn).
* - One or various flags may be active at one time, or even none.
* - When you create a flag, you associate it with a T object. You also
* give it a priority : QSwitcher::addFlag(int flagId , int priority , const T& object).
* - switchs: there is always one (and only one) active switch (QSwitcher::setActiveSwitch(int switchId) ).
*
* The "active" T object is the one associated with the highest priority "on" flag.
*
* The switch are used to associate more than one T object with a flag : you can add
* others T object to a flag, associating each new T object with
* a switch ( QSwitcher::setSwitchedFlag(int flagId, int switchId , const T& object) ) ;
* the "active" T object will be the one associated with the active switch.
*
* To sum-up :
* - first, the QSwitcher determine the highest priority "on" flag
* - then, the QSwitcher checks, for this flag, if there is a specific T object associated with the active switch.
* - if there is one, use it. If not, use the standard flag's T object.
*/
template <class T>
class QSwitcher
{
typedef QMap<int,T> QMapIntBrush;
typedef QMap<int,T> QMapIntPen;
public:
QSwitcher()
{
mSwitch = 0;
}
int switchValue() const { return mSwitch; }
bool isFlagOn(int flagId) { return mOnFlags.contains( flagId ); }
void setFlag(int flagId, bool isOn)
{
//Checks if we know the specified flagId
if ( !mActiveObjects.contains(flagId) )
{
qWarning( "QSelectionItem::setFlag : unknown flagId : %d" , flagId );
return;
}
//Adds or remove flagId from the "activated ids" list.
if ( isOn )
{
if ( !mOnFlags.contains(flagId) )
mOnFlags << flagId;
}
else
mOnFlags.removeAll( flagId );
updateActiveObject();
}
void setActiveSwitch(int switchId)
{
if ( switchId != mSwitch )
{
mSwitch = switchId;
updateActiveObject();
}
}
/*!
* \brief Creates a new flag.
* \param flagId : id, will be used to set the flag on/off. Must be >= 0.
* \param priority: the flag's priority. Must be >= 0
* \param object: the T object associated with this flag.
*/
void addFlag(int flagId , int priority , const T& object)
{
mActiveObjects[flagId][0] = object;
mPriorities[flagId] = priority;
}
void setSwitchedFlag( int flagId , int switchId , const T& object )
{
if ( switchId < 0 )
qCritical("QSelectionItem::setSwitchedFlag : invalid switchId : %d" , switchId);
if ( !mActiveObjects.contains(flagId) )
qCritical("QSelectionItem::setSwitchedFlag : unknown flagId : %d" , flagId);
mActiveObjects[flagId][switchId] = object;
}
const T& activeObject() const { return mActiveObject; }
protected:
void updateActiveObject()
{
//Find the highest priority flag.
int maxPriority = -1;
int id = -1;
for ( int i = 0 ; i < mOnFlags.size() ; i++ )
{
int priority = mPriorities[mOnFlags[i]];
if ( priority > maxPriority )
{
id = mOnFlags[i];
maxPriority = priority;
}
}
if ( id >= 0 )
{
//Use pen and brush for this couple (flag,switch)
//if pen/brush have been defined for this switch.
//Else, use default pen/brush for this flag (switch=0)
if ( mActiveObjects[id].contains(mSwitch) )
mActiveObject = mActiveObjects[id][mSwitch];
else
mActiveObject = mActiveObjects[id][0];
}
}
T mActiveObject;
QMap<int,QMapIntPen> mActiveObjects;
QMap<int,int> mPriorities;
QList<int> mOnFlags;
int mSwitch;
};
#endif //SWITCHER_H
|
