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annotate qt/core/QMetaObject.d @ 259:515d6e1c7b10 lifetime

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another iteration
author maxter
date Thu, 17 Sep 2009 16:28:41 +0000
parents 073b9153ed8a
children b5773ccab07d
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1 module qt.core.QMetaObject;
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2
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3 import qt.QGlobal;
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4 import qt.core.QObject;
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5 import qt.QtdObject;
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6
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7 /++
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8 Meta-object for QObject classes.
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9 +/
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10 final class QMetaObject : MetaObject
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11 {
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12 alias typeof(this) This;
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13
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14 private void* _nativeId;
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15
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16 this(void* nativeId, QMetaObject base)
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17 {
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18 _nativeId = nativeId;
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19 super(base);
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20 }
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21
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22 /++
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23 +/
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24 void* nativeId()
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25 {
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26 return _nativeId;
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27 }
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28
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29 private QMetaObject lookupDerived(void*[] moIds)
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30 {
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31 assert (moIds.length >= 1);
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32
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33 for (auto mo = static_cast!(This)(firstDerived); mo !is null; mo = static_cast!(This)(mo.next))
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34 {
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35 if (mo._nativeId == moIds[0])
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36 {
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37 if (moIds.length == 1) // exact match found
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38 return mo;
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39 else // look deeper
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40 return mo.lookupDerived(moIds[1..$]);
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41 }
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42 }
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43
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44 // no initialized wrapper that matches the native object.
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45 // use the base class wrapper
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46 return this;
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47 }
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48
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49 QObject wrap(void* nativeObjId, QtdObjectFlags flags = QtdObjectFlags.none)
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50 {
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51 QObject result;
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52
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53 if (nativeObjId)
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54 {
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55 result = cast(QObject)qtd_get_d_qobject(nativeObjId);
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56 if (!result)
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57 {
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58 auto moId = qtd_QObject_metaObject(nativeObjId);
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59 if (_nativeId == moId)
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60 result = _createWrapper(nativeObjId, flags);
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61 else
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62 {
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63 // get native metaobjects for the entire derivation lattice
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64 // up to, but not including, the current metaobject.
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65 size_t moCount = 1;
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66
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67 for (void* tmp = moId;;)
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68 {
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69 tmp = qtd_QMetaObject_superClass(tmp);
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70 if (!tmp)
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71 return null;
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72
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73 if (tmp == _nativeId)
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74 break;
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75 moCount++;
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76 }
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77
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78 void*[] moIds = (cast(void**)alloca(moCount * (void*).sizeof))[0..moCount];
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79
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80 moIds[--moCount] = moId;
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81 while (moCount > 0)
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82 moIds[--moCount] = moId = qtd_QMetaObject_superClass(moId);
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83
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84 result = lookupDerived(moIds)._createWrapper(nativeObjId, flags);
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85 }
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86 }
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87 }
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88
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89 return result;
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90 }
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91 }
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92
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93 extern(C) void* qtd_QMetaObject_superClass(void* nativeId);