diff options
Diffstat (limited to 'doc/src/porting/porting-qsa.qdoc')
| -rw-r--r-- | doc/src/porting/porting-qsa.qdoc | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/doc/src/porting/porting-qsa.qdoc b/doc/src/porting/porting-qsa.qdoc index ea83e97..e831583 100644 --- a/doc/src/porting/porting-qsa.qdoc +++ b/doc/src/porting/porting-qsa.qdoc @@ -64,7 +64,7 @@ can have named properties. For instance to create an point object with the properties x and y one would write the following Qt Script code: - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 0 + \snippet doc/src/snippets/code/doc_src_porting-qsa.js 0 The object \c point in this case is constructed as a plain object and we assign two properties, \c x and \c y, to it with the values 12 and @@ -73,17 +73,17 @@ global namespace of the script engine. Similarly, global functions are named properties of the global object; for example: - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 1 + \snippet doc/src/snippets/code/doc_src_porting-qsa.js 1 An equivalent construction that illustrates that the function is a property of the global object is the following assignment: - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 2 + \snippet doc/src/snippets/code/doc_src_porting-qsa.js 2 Since functions are objects, they can be assigned to objects as properties, becoming member functions: - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 3 + \snippet doc/src/snippets/code/doc_src_porting-qsa.js 3 In the code above, we see the first subtle difference between QSA and Qt Script. In QSA one would write the point class like this: @@ -99,7 +99,7 @@ All the code above runs with QSA except the assignment of a function to \c{point.manhattanLength}, which we repeat here for clarity: - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 5 + \snippet doc/src/snippets/code/doc_src_porting-qsa.js 5 This is because, in QSA, the value of \c this is decided based on the location of the declaration of the function it is used in. In the @@ -129,7 +129,7 @@ function with the newly created object as the \c this pointer. So, in a sense, it is equivalent to: - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 8 + \snippet doc/src/snippets/code/doc_src_porting-qsa.js 8 This is similar to the manhattenLength() example above. Again, the main difference between QSA and Qt Script is that one has to @@ -149,7 +149,7 @@ one could write this in Qt Script as: - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 10 + \snippet doc/src/snippets/code/doc_src_porting-qsa.js 10 In QSA, the member functions were part of the class declaration, and were therefore shared between all instances of a given class. @@ -173,7 +173,7 @@ To make the \c toString() function part of the prototype, we write code like this: - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 11 + \snippet doc/src/snippets/code/doc_src_porting-qsa.js 11 Here, we made the \c toString() function part of the prototype so that, when we call \c{car.toString()} it will be resolved via the @@ -195,7 +195,7 @@ without any special members, but it is possible to replace this object with another prototype object. - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 13 + \snippet doc/src/snippets/code/doc_src_porting-qsa.js 13 In the code above, we have a constructor, \c{GasolineCar}, which calls the "base class" implementation of the constructor to @@ -223,7 +223,7 @@ as static members as properties of the constructor function. For example: - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 15 + \snippet doc/src/snippets/code/doc_src_porting-qsa.js 15 Note that in QSA, static member variables were also accessible in instances of the given class. In Qt Script, with the approach @@ -374,7 +374,7 @@ the interpreter using their object names as the names of the variables. - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 16 + \snippet doc/src/snippets/code/doc_src_porting-qsa.cpp 16 The code above adds the button to the global namespace under the name "button". One obvious limitation here is that there is potential for @@ -382,7 +382,7 @@ provides a more flexible way of adding QObjects to the scripting environment. - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 17 + \snippet doc/src/snippets/code/doc_src_porting-qsa.cpp 17 In the code above we create a QPushButton and wrap it in a script value using the function, QScriptEngine::newQObject(). This gives us @@ -404,14 +404,14 @@ Below is listed some code from the filter example in the QSA package. - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 18 + \snippet doc/src/snippets/code/doc_src_porting-qsa.cpp 18 The equivalent in Qt Script is written in much the same way as constructors are written in scripts. We register a callback C++ function under the name "ImageSource" in the global namespace and return the QObject from this function: - \snippet doc/src/snippets/code/doc_src_porting-qsa.qdoc 19 + \snippet doc/src/snippets/code/doc_src_porting-qsa.cpp 19 In the Qt Script case we use the same approach that we use to expose a QObject, namely via QScriptEngine::newQObject(). This function also |