Qt Signal Slot Custom Type

(Redirected from How to USe QPushButton)

24 Signals and slots; 25 Qt for beginners — Finding information in the documentation. Especially the type. If you connect a signal to a slot that does not share the same kind of parameters, when the connection is done (at run-time) you will get a warning like. Implementing custom signals and slots. We call a custom method in the Worker thread instance with the size of the viewer label and the number of stars, obtained from the spin box. Whenever is star is drawn by the worker thread, it will emit a signal that is connected to the addImage slot. This slot is called with a QRect value. The custom Message type can also be used with direct signal-slot connections. To register a custom type for use with queued signals and slots, such as those used in cross-thread communication, see the Queued Custom Type Example. More information on using custom types with Qt can be found in the Creating Custom Qt Types document.

Standard types such as QSize, QColor and QString can all be stored in QVariant objects, used as the types of properties in QObject-based classes, and emitted in signal-slot communication. In this document, we take a custom type and describe how to integrate it into Qt's object model so that it can be stored in the same way as standard Qt types. Slots can provide hours of entertainment for almost qt signal slot argument type nothing, and there are no time restrictions or pressure to keep playing., nr vosborg slot, gambling orange county ca, illegal gambling penalties, grand casino avoyelles, leza lucas poker. Win thousands qt signal slot argument type of G-Coins for free!


  • 2Signals
  • 3Basic Usage
  • 4Example


Using QPushButton developers can create and handle buttons. This class is easy to use and customize so it is among the most useful classes in Qt. In general the button displays text but an icon can also be displayed.

QPushButton inherits QAbstractButton which in turn inherits QWidget.


Inherited from QAbstractButton

  • void clicked ( bool checked = false )
  • void pressed ()
  • void released ()
  • void toggled ( bool checked )

Inherited from QWidget

  • void customContextMenuRequested ( const QPoint &pos )

Inherited from QObject

  • void destroyed ( QObject * obj = 0 )

Basic Usage


The text of QPushButton can be set upon creation or using setText(). To get the current text of the button use text().


The icon of QPushButton can also be set upon creation. After creation the icon can be changed using setIcon() To get the current icon of the button use icon()

Set Position and Size

To set the position and the size of the button use setGeometry(). If you want just to modify the size of the button use resize()

Handle Button

QPushButton emits signals if an event occurs. To handle the button connect its appropriate signal to a slot: /isle-casino-racing-pompano-park-florida/.

Qt Signal Slot Custom Type


The following simple code snippet shows how to create and use QPushButton. It has been tested on Qt Symbian Simulator.

Qt Signal Slot Connect

Ladbrokes casino bonus code 2019. An instance of QPushButton is created. Signal released() is connected to slot handleButton() which changes the text and the size of the button.

To build and run the example:

  1. Create an empty folder
  2. Create a file for each of the below code snippets and add the example code to them (the name of the file should match the name above the snippet).
    • All 4 files must be in the same folder.
  3. Using command line, navigate into the folder with the 4 files.
  4. run qmake on the project file:
    • If successful it will not print any output.
    • This should create a file with the name Makefile in the folder.
  5. Build the application:
    • The application should compile without any issues.
  6. Run the application:

The above steps are for linux but can easily be followed on other systems by replacing make with the correct make call for the system.





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