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1 package in.srain.cube.views.ptr;
2
3 import in.srain.cube.views.ptr.indicator.PtrIndicator;
4
5 /**
6  * A single linked list to wrap PtrUIHandler
7  */
8 class PtrUIHandlerHolder implements PtrUIHandler {
9
10     private PtrUIHandler mHandler;
11     private PtrUIHandlerHolder mNext;
12
13     private boolean contains(PtrUIHandler handler) {
14         return mHandler != null && mHandler == handler;
15     }
16
17     private PtrUIHandlerHolder() {
18
19     }
20
21     public boolean hasHandler() {
22         return mHandler != null;
23     }
24
25     private PtrUIHandler getHandler() {
26         return mHandler;
27     }
28
29     public static void addHandler(PtrUIHandlerHolder head, PtrUIHandler handler) {
30
31         if (null == handler) {
32             return;
33         }
34         if (head == null) {
35             return;
36         }
37         if (null == head.mHandler) {
38             head.mHandler = handler;
39             return;
40         }
41
42         PtrUIHandlerHolder current = head;
43         for (; ; current = current.mNext) {
44
45             // duplicated
46             if (current.contains(handler)) {
47                 return;
48             }
49             if (current.mNext == null) {
50                 break;
51             }
52         }
53
54         PtrUIHandlerHolder newHolder = new PtrUIHandlerHolder();
55         newHolder.mHandler = handler;
56         current.mNext = newHolder;
57     }
58
59     public static PtrUIHandlerHolder create() {
60         return new PtrUIHandlerHolder();
61     }
62
63     public static PtrUIHandlerHolder removeHandler(PtrUIHandlerHolder head, PtrUIHandler handler) {
64         if (head == null || handler == null || null == head.mHandler) {
65             return head;
66         }
67
68         PtrUIHandlerHolder current = head;
69         PtrUIHandlerHolder pre = null;
70         do {
71
72             // delete current: link pre to next, unlink next from current;
73             // pre will no change, current move to next element;
74             if (current.contains(handler)) {
75
76                 // current is head
77                 if (pre == null) {
78
79                     head = current.mNext;
80                     current.mNext = null;
81
82                     current = head;
83                 } else {
84
85                     pre.mNext = current.mNext;
86                     current.mNext = null;
87                     current = pre.mNext;
88                 }
89             } else {
90                 pre = current;
91                 current = current.mNext;
92             }
93
94         } while (current != null);
95
96         if (head == null) {
97             head = new PtrUIHandlerHolder();
98         }
99         return head;
100     }
101
102     @Override
103     public void onUIReset(PtrFrameLayout frame) {
104         PtrUIHandlerHolder current = this;
105         do {
106             final PtrUIHandler handler = current.getHandler();
107             if (null != handler) {
108                 handler.onUIReset(frame);
109             }
110         } while ((current = current.mNext) != null);
111     }
112
113     @Override
114     public void onUIRefreshPrepare(PtrFrameLayout frame) {
115         if (!hasHandler()) {
116             return;
117         }
118         PtrUIHandlerHolder current = this;
119         do {
120             final PtrUIHandler handler = current.getHandler();
121             if (null != handler) {
122                 handler.onUIRefreshPrepare(frame);
123             }
124         } while ((current = current.mNext) != null);
125     }
126
127     @Override
128     public void onUIRefreshBegin(PtrFrameLayout frame) {
129         PtrUIHandlerHolder current = this;
130         do {
131             final PtrUIHandler handler = current.getHandler();
132             if (null != handler) {
133                 handler.onUIRefreshBegin(frame);
134             }
135         } while ((current = current.mNext) != null);
136     }
137
138     @Override
139     public void onUIRefreshComplete(PtrFrameLayout frame) {
140         PtrUIHandlerHolder current = this;
141         do {
142             final PtrUIHandler handler = current.getHandler();
143             if (null != handler) {
144                 handler.onUIRefreshComplete(frame);
145             }
146         } while ((current = current.mNext) != null);
147     }
148
149     @Override
150     public void onUIPositionChange(PtrFrameLayout frame, boolean isUnderTouch, byte status, PtrIndicator ptrIndicator) {
151         PtrUIHandlerHolder current = this;
152         do {
153             final PtrUIHandler handler = current.getHandler();
154             if (null != handler) {
155                 handler.onUIPositionChange(frame, isUnderTouch, status, ptrIndicator);
156             }
157         } while ((current = current.mNext) != null);
158     }
159 }