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How to use QSignalMapper for a list of QAction items

WebAug 4, 2016 · So that's 2N allocations. In comparison, adding a mapping to a QSignalMapper performs an amortized log(N) allocations. Otherwise, QSignalMapper is useless. In Qt 5 using it would be outright an antipattern since you can connect to std::bind or a lambda. In any case, it'd be much nicer if QSignalMapper mapped to a QVariant. WebQSignalMapper类可以看成是信号的翻译和转发器。 它可以把一个无参的信号翻译成带int参数、QString参数、 QObject* 参数或者QWidget *参数的信号，并将之转发。 QSignalMapper类的功能核心是要建立一个从原始信号的object到需要的数据的映射（setMapper函数）。 map ()作为QSignalMapper的一个槽函数，将根据setMapping规则 … lcd visor motorcycle

Obsolete Members for QSignalMapper Qt Core 5.15.13

WebJun 22, 2016 · It works, since QSignalMapper is a C++ class, and therefore can be used with the second form of slot/signal connection, which do not require MOC. Here’s an example: ... Qt’s QAbstractFileEngine got deprecated in 5.x release for “performance reasons” (a bit of discussion). I wonder what kind of code in their implementation lead to this ... WebThe QSignalMapper class bundles signals from identifiable senders. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. The class supports the mapping of particular strings or integers with particular objects using setMapping (). WebDeprecated methods (protected, public, static, non-static and constructors) Detailed description; Public constructors. new QSignalMapper: new ... Method void QSignalMapper::setMapping(QObject *sender, QObject *object) Public static methods and constants. QMetaObject: staticMetaObject: Obtains the static MetaObject for this class. lcd viewsonic va2261h-2