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Q_object slots

class A: public QObject { Q_OBJECT public slots: void someSlot(int foo = 0); }; The old method allows you to connect that slot to a signal that does not have arguments. But I cannot know with template code if a function has default arguments or not. So this feature is disabled. Aug 05,  · A short history. Long long ago, subclass QThread and reimplement its run() function is the only recommended way of using QThread. This is rather intuitive and easy to used. But when SLOTS and Qt event loop are used in the worker thread, some users do it V-LEAGUE.PRO Bradley T. Hughes, one of the Qt core developers, recommend that use worker objects by moving them to the thread using QObject. The meta-object system is based on three things: The QObject class provides a base class for objects that can take advantage of the meta-object system. The Q_OBJECT macro inside the private section of the class declaration is used to enable meta-object features, .

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You must not delete the QObject directly if it exists in a different thread than the one currently executing. QMetaObject::newInstance constructs a new instance of the class. This example returns a child QPushButton of parentWidget named "button1" , even if the button isn't a direct child of the parent:. It can be used in signal connections but cannot be emitted by the user. Creates a connection of the given type from the signal in the sender object to the method in the receiver object. It also pollutes your class's namespace with QObject -specific members.

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Qt's meta-object system provides the signals and slots mechanism for inter-object communication, run-time type information, and the dynamic property system. This generated source file is either include 'd into the class's source file or, more usually, compiled and linked with the class's implementation.

In addition to providing the signals and slots mechanism for communication between objects the main reason for introducing the system , the meta-object code provides the following additional features:. It attempts to cast its argument to the pointer type specified in angle-brackets, returning a non-zero pointer if the object is of the correct type determined at run-time , or 0 if the object's type is incompatible. The cast to QLabel , on the other hand, fails. The pointer is then set to 0.

This makes it possible to handle objects of different types differently at run-time, based on the type:. From the meta-object system's point of view, a QObject subclass without meta code is equivalent to its closest ancestor with meta-object code. This means for example, that QMetaObject::className will not return the actual name of your class, but the class name of this ancestor.

Documentation contributions included herein are the copyrights of their respective owners. Documentation sources may be obtained from www. All other trademarks are property of their respective owners. Privacy Policy. Search index:. Home The Meta-Object System. A A A Print. The Meta-Object System Qt's meta-object system provides the signals and slots mechanism for inter-object communication, run-time type information, and the dynamic property system.

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Signals and slots are used for communication between objects. The signals and slots mechanism is a central feature of Qt and probably the part that differs most from the features provided by other frameworks. Signals and slots are made possible by Qt's meta-object system. In GUI programming, when we change one widget, we often want another widget to be notified. More generally, we want objects of any kind to be able to communicate with one another.

For example, if a user clicks a Close button, we probably want the window's close function to be called. Other toolkits achieve this kind of communication using callbacks. A callback is a pointer to a function, so if you want a processing function to notify you about some event you pass a pointer to another function the callback to the processing function.

The processing function then calls the callback when appropriate. While successful frameworks using this method do exist, callbacks can be unintuitive and may suffer from problems in ensuring the type-correctness of callback arguments. In Qt, we have an alternative to the callback technique: We use signals and slots.

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A signal is emitted when a particular event occurs. Qt's widgets have many predefined signals, but we can always subclass widgets to add our own signals to them. A slot is a function that is called in response to a particular signal. Qt's widgets have many pre-defined slots, but it is common practice to subclass widgets and add your own slots so that you can handle the signals that you are interested in.

The signals and slots mechanism is type safe: The signature of a signal must match the signature of the receiving slot. In fact a slot may have a shorter signature than the signal it receives because it can ignore extra arguments. Since the signatures are compatible, the compiler can help us detect type mismatches when using the function pointer-based syntax.

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Read Full Review. At least this time we escape the Oriental theme and instead have a beautiful wild horse on a background of rolling green fields and hills overlaid by gentle music. So will this horse take you for a ride? Golden game The slot only has 10 pay lines over 5 reels which is quite unusual for NextGen's editions so at least this should mean a slightly more volatile game.

The symbols are single and Golden Mane Wilds appear on all reels with no multiplier attached. The top paying 5-of-a-kind is the Wild at x stake while the best horse icon pays 70x. There are 2 country scene pictures both paying 18x stake and even the lowest card value pays 10x stake.

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The pays for 2 or 3 symbol wins are low though which gives us a clue to the volatility of Golden Mane slot. One thing NextGen have stuck with is their love of scatters appearing on the middle 3 reels, in this case in the form of horseshoes.

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Galloping bonus There is a fortunate quirk to the game in that you trigger free games with only 2 of the 3 possible scatters, although unless retriggering this has limited potential. If landing all 3 you get 6 free spins and 2 for landing 2. The enhancement is that for the initial 2 spins firstly the White Horse becomes an extra Wild on the reels, and on the second spin the Black Horse does.

This makes the retrigger or initial 3-scatter trigger more important as on the third and fourth free spin the Mountain and Tree symbols become Wilds respectively.

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