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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/***************************************************************************
begin : Thu Aug 19 2004
copyright : (C) 2002 - 2004 by Michael Pyne
email : [email protected]
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#ifndef _TRACKSEQUENCEMANAGER_H
#define _TRACKSEQUENCEMANAGER_H
#include <tqobject.h>
class TDEPopupMenu;
class TrackSequenceIterator;
class PlaylistItem;
class Playlist;
/**
* This class is responsible for managing the music play sequence for JuK.
* Instead of playlists deciding which song goes next, this class is used to
* do so. You can replace the iterator used as well, although the class
* provides a default iterator that supports random play and playlist looping.
*
* @see Playlist
* @see TrackSequenceIterator
* @author Michael Pyne <[email protected]>
*/
class TrackSequenceManager : public TQObject
{
TQ_OBJECT
public:
/**
* Destroys the track sequence manager. The sequence iterators will also
* be deleted, but the playlist, popup menu, and playlist items will not be
* touched.
*/
~TrackSequenceManager();
/**
* This function installs a new iterator to be used instead of the old
* one. TrackSequenceManager will control the iterator after that,
* deleting the iterator when another is installed, or when the
* TrackSequenceManager is destroyed.
*
* @param iterator the iterator to install, or 0 for the default
* @return true if installation successfully happened
*/
bool installIterator(TrackSequenceIterator *iterator);
/**
* @return currently selected iterator
*/
TrackSequenceIterator *iterator() const { return m_iterator; }
/**
* This function returns a pointer to the currently set iterator, and
* then removes the TrackSequenceManager's pointer to the iterator without
* deleting the iterator. You should only do this if you are going to be
* using @see installIterator to give control of the iterator back to the
* TrackSequenceManager at some point. Also, you must install a
* replacement iterator before the TrackSequenceManager is otherwise
* used. If you use this function, you must manually set the current
* item of the iterator you replace the old one with (if you want).
*
* @see installIterator
* @return the currently set iterator.
*/
TrackSequenceIterator *takeIterator();
/**
* Returns the global TrackSequenceManager object. This is the only way to
* access the TrackSequenceManager.
*
* @return the global TrackSequenceManager
*/
static TrackSequenceManager *instance();
/**
* Returns the next track, and advances in the current sequence..
*
* @return the next track in the current sequence, or 0 if the end has
* been reached
*/
PlaylistItem *nextItem();
/**
* Returns the previous track, and backs up in the current sequence. Note
* that if you have an item x, nextItem(previousItem(x)) is not guaranteed
* to equal x, even ignoring the effect of hitting the end of list.
*
* @return the previous track in the current sequence, or 0 if the
* beginning has been reached
*/
PlaylistItem *previousItem();
/**
* @return the current track in the current sequence, or 0 if there is no
* current track (for example, an empty playlist)
*/
PlaylistItem *currentItem() const;
/**
* @return the current TDEPopupMenu used by the manager, or 0 if none is
* set
*/
TDEPopupMenu *popupMenu() const { return m_popupMenu; }
/**
* @return the TrackSequenceManager's idea of the current playlist
*/
Playlist *currentPlaylist() const { return m_playlist; }
public slots:
/**
* Set the next item to play to @p item
*
* @param item the next item to play
*/
void setNextItem(PlaylistItem *item);
/**
* Sets the current playlist. This is necessary in order for some of the
* actions in the popup menu used by this class to work. Note that the
* current playlist is not necessarily the same as the playlist that is
* playlist. The TrackSequenceManager does not own @p list after this
* call.
*
* @param list the current playlist
*/
void setCurrentPlaylist(Playlist *list);
/**
* Sets the current item to @p item. You should try to avoid calling this
* function, instead allowing the manager to perform its work. However,
* this function is useful for clearing the current item. Remember that
* you must have a valid playlist to iterate if you clear the current item.
*
* @param item the PlaylistItem that is currently playing. Set to 0 if
* there is no item playing.
*/
void setCurrent(PlaylistItem *item);
private:
/**
* Sets up various connections, to be run after the GUI is running.
* Automatically run by instance().
*
* @see instance
*/
void initialize();
/**
* Constructs the sequence manager. The constructor will work even before
* the GUI has been created. Note that you can't actually construct an
* object with this function, use instance().
*
* @see instance
*/
TrackSequenceManager();
protected slots:
/**
* This slot should be called when @a item is about to be deleted, so that
* the TrackSequenceManager can make sure that any pointers held pointing
* to @a item are corrected.
*
* @param item The PlaylistItem about to be deleted.
*/
void slotItemAboutToDie(PlaylistItem *item);
private:
Playlist *m_playlist;
PlaylistItem *m_curItem, *m_playNextItem;
TDEPopupMenu *m_popupMenu;
TrackSequenceIterator *m_iterator;
TrackSequenceIterator *m_defaultIterator;
bool m_initialized;
};
#endif /* _TRACKSEQUENCEMANAGER_H */
|
