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3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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38 ** $QT_END_LICENSE$ |
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40 ****************************************************************************/ |
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41 |
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42 /*! |
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43 \example uitools/multipleinheritance |
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44 \title Multiple Inheritance Example |
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45 |
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46 The Multiple Inheritance Example shows how to use a form created with \QD |
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47 in an application by subclassing both QWidget and the user interface |
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48 class, which is \c{Ui::CalculatorForm}. |
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49 |
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50 \image multipleinheritance-example.png |
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51 |
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52 To subclass the \c calculatorform.ui file and ensure that \c qmake |
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53 processes it with the \c uic, we have to include \c calculatorform.ui |
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54 in the \c .pro file, as shown below: |
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55 |
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56 \snippet examples/uitools/multipleinheritance/multipleinheritance.pro 0 |
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57 |
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58 When the project is compiled, the \c uic will generate a corresponding |
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59 \c ui_calculatorform.h. |
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60 |
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61 \section1 CalculatorForm Definition |
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62 |
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63 In the \c CalculatorForm definition, we include the \c ui_calculatorform.h |
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64 that was generated earlier. |
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65 |
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66 \snippet examples/uitools/multipleinheritance/calculatorform.h 0 |
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67 |
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68 As mentioned earlier, the class is a subclass of both QWidget and |
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69 \c{Ui::CalculatorForm}. |
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70 |
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71 \snippet examples/uitools/multipleinheritance/calculatorform.h 1 |
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72 |
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73 Two slots are defined according to the \l{Automatic Connections} |
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74 {automatic connection} naming convention required by \c uic. This is |
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75 to ensure that \l{QMetaObject}'s auto-connection facilities connect |
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76 all the signals and slots involved automatically. |
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77 |
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78 \section1 CalculatorForm Implementation |
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79 |
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80 In the constructor, we call \c setupUi() to load the user interface file. |
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81 Note that we do not need the \c{ui} prefix as \c CalculatorForm is a |
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82 subclass of the user interface class. |
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83 |
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84 \snippet examples/uitools/multipleinheritance/calculatorform.cpp 0 |
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85 |
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86 We include two slots, \c{on_inputSpinBox1_valueChanged()} and |
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87 \c{on_inputSpinBox2_valueChanged()}. These slots respond to the |
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88 \l{QSpinBox::valueChanged()}{valueChanged()} signal that both spin boxes |
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89 emit. Whenever there is a change in one spin box's value, we take that |
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90 value and add it to whatever value the other spin box has. |
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91 |
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92 \snippet examples/uitools/multipleinheritance/calculatorform.cpp 1 |
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93 \codeline |
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94 \snippet examples/uitools/multipleinheritance/calculatorform.cpp 2 |
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95 |
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96 \section1 \c main() Function |
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97 |
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98 The \c main() function instantiates QApplication and \c CalculatorForm. |
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99 The \c calculator object is displayed by invoking the \l{QWidget::show()} |
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100 {show()} function. |
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101 |
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102 \snippet examples/uitools/multipleinheritance/main.cpp 0 |
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103 |
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104 There are various approaches to include forms into applications. The |
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105 Multiple Inheritance approach is just one of them. See |
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106 \l{Using a Designer UI File in Your Application} for more information on |
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107 the other approaches available. |
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108 */ |