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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 final class QMetaObject
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8 {
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9 private
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10 {
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11 void* _nativeId;
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12 QMetaObject _base; // super class
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13 QMetaObject _firstDerived; // head of the linked list of derived classes
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14 QMetaObject _next; // next sibling on this derivation level
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15 ClassInfo _classInfo;
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16
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17 QObject function(void* nativeId) _createWrapper;
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18 }
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19
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20 private void addDerived(QMetaObject mo)
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21 {
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22 mo._next = _firstDerived;
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23 _firstDerived = mo;
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24 }
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25
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26 // NOTE: construction is split between this non-templated constructor and 'construct' function below.
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27 this(void* nativeId, QMetaObject base)
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28 {
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29 _nativeId = nativeId;
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30 if (base)
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31 {
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32 base.addDerived(this);
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33 _base = base;
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34 }
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35 }
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36
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37 // TODO: remove when D acquires templated constructors
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38 void construct(T : QObject, Concrete = T)()
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39 {
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40 _classInfo = T.classinfo;
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41
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42 static QObject createWrapper(void* nativeId)
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43 {
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44 T obj = new Concrete(nativeId, QtdObjectFlags.nativeOwnership);
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45 // TODO: this probably should be moved to QObject constructor
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46 qtd_create_qobject_entity(nativeId, cast(void*)obj);
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47 return obj;
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48 }
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49
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50 _createWrapper = &createWrapper;
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51 }
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52
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53 /++
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54 +/
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55 QMetaObject base()
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56 {
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57 return _base;
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58 }
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59
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60 /++
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61 +/
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62 void* nativeId()
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63 {
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64 return _nativeId;
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65 }
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66
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67 /++
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68 +/
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69 ClassInfo classInfo()
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70 {
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71 return _classInfo;
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72 }
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73
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74 private QObject lookupDerived(void*[] moIds, void* nativeObjId)
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75 {
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76 assert (moIds.length >= 1);
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77
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78 for (auto mo = _firstDerived; mo !is null; mo = mo._next)
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79 {
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80 if (mo._nativeId == moIds[0])
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81 {
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82 if (moIds.length == 1) // exact match found
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83 return mo._createWrapper(nativeObjId);
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84 else // look deeper
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85 return mo.lookupDerived(moIds[1..$], nativeObjId);
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86 }
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87 }
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88
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89 // no initialized wrapper that matches the native object.
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90 // use the base class wrapper
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91 return _createWrapper(nativeObjId);
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92 }
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93
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94 QObject getObject(void* nativeObjId)
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95 {
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96 QObject result;
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97
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98 if (nativeObjId)
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99 {
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100 result = cast(QObject)qtd_get_d_qobject(nativeObjId);
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101 if (!result)
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102 {
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103 auto moId = qtd_QObject_metaObject(nativeObjId);
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104 if (_nativeId == moId)
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105 result = _createWrapper(nativeObjId);
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106 else
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107 {
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108 // get native metaobjects for the entire derivation lattice
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109 // up to, but not including, the current metaobject.
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110 size_t moCount = 1;
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111
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112 for (void* tmp = moId;;)
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113 {
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114 tmp = qtd_QMetaObject_superClass(tmp);
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115 assert(tmp);
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116 if (tmp == _nativeId)
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117 break;
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118 moCount++;
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119 }
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120
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121 void*[] moIds = (cast(void**)alloca(moCount * (void*).sizeof))[0..moCount];
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122
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123 moIds[--moCount] = moId;
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124 while (moCount > 0)
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125 moIds[--moCount] = moId = qtd_QMetaObject_superClass(moId);
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126
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127 result = lookupDerived(moIds, nativeObjId);
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128 }
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129 }
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130 }
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131
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132 return result;
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133 }
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134 }
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135
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136 extern(C) void* qtd_QMetaObject_superClass(void* nativeId); |
