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Create a custom slot in C, Qt5. In order to use signals and slots, you need to have the QOBJECT macro in your class as well as identifying which functions should be the signals and the slots. Have a look at the documentation for a more in-depth explanation. After this, you need to set up the project file so that MOC can generate. In Qt Designer's signals and slots editing mode, you can connect objects in a form together using Qt's signals and slots mechanism.Both widgets and layouts can be connected via an intuitive connection interface, using the menu of compatible signals and slots provided by Qt Designer.When a form is saved, all connections are preserved so that they will be ready for use when your project is built. This page describes the use of signals and slots in Qt for Python. The emphasis is on illustrating the use of so-called new-style signals and slots, although the traditional syntax is also given as a reference. The main goal of this new-style is to provide a more Pythonic syntax to Python programmers. This way the Qt Creator will generate the slot definition and declaration (.h and.cpp files), and will show you the newly created slot on the cpp. PS.: You can create these 'automatic' slots by hand, since the Qt compiler will detect it, but this isn't recommended, for real:P.
Example
QtCreator is, at the moment, the best tool to create a Qt application. In this example, we will see how to create a simple Qt application which manage a button and write text.
To create a new application click on File->New File or Project:
Then choose the Projects->Application->Qt Widgets Application
Free poker app win real money. Then you can choose the name and path of your project :
Next, you can choose the kits you will be using. If you don't have any kit, QtCreator will create a kit with your Qt version and the main compiler of your computer. If you don't have any compiler, you can install one. On Windows: install Visual Studio. On Linux/Mac : install g++ or clang++.
Then you can choose the name of your main window class, the inherited class, the name of the file corresponding to your main window class. If you are learning or testing Qt, you don't really need to change them.
The last step can be to choose a subproject of this project and to add a version control such as git and svn. Again if it's only for tests, you don't need to change them.
Then click on the Finish Button. Now you should be here:
This is the base of your application. if you run it now by clicking on Build->Run or ctrl+R (by default) you will see an empty window.
Now we will add a text and a button. to do that, we will use Qt Designer. Double click on the mainwindow.ui So now you should see: (if not and you see some xml file, click on the Design button at the left)
Here Qt Designer ! Seems quite complicated. But once you get used to it, it really great. We will add some text and a button. On the left, there is the list of the items. You can click on one and drag&drop the objects. Click on the Push Button and drop it in the window. Then search the Label, and do the same (you have a filter at the top left where you can write the object you are looking for).
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You should have something like this now:
By double clicking of the object, you can change the text on them. Or you can see at the bottom right the properties of the object you are now and find the text property. Here you can also change the name.
Now if you save and run (better click on the edit button then save again to be sure your modifications has been saved), you get:
Huh? Why my label and button are like that when I run ? It's because there is no layout in our central object. By the way, if you resize your main window, you can see that the object are keeping their place. So to fix it we will add a layout. Let's say a vertical layout. Play slot games for fun. So drag and drop a vertical layout from the object list at the left. Now you should see:
A floating layout.
So now right click on the main window, anywhere except on the label and button. cClick on Lay out->Lay Out Vertically. Now you should see that your objects a vertically aligned in your window. So now Move (with drag and drop again) your label and button in the layout. now you should get:
In your designer. And if you run you application:
Here you can see your application with the label and the button. And if you resize your window, the label and button are resizing too.
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But our button is still doing nothing. We can change it in 2 different ways. The first is to connect the button with a method we created. We can do it with the method name connect. So let's go back to our code and go to mainwindow.cpp now add:
In the constructor of your MainWindow AFTER the
ui->setupUI(this);
which initialize the ui.Then we can create the MainWindow::whenButtonIsClicked() in our .cpp class which could change the text of the label like that:
And in our mainwindow.h, we need to add:
Public slots mean that this method can be called when a signal is received. connect link the signal when we click on the button and a method to call.
So now if we run our application and click on the button, we get:
Which mean that our connect is working. But with Qt Designer we have an even simpler way to do it. If you want to do the other way, remove the connect to unconnect the button (because we will connect it differently), go back to mainwindow.ui and right click on the button. Click on Go to slot.. , select clicked() and press ok.
Then you should be moved to this function:
This is the function which will be called when you click on the button. So you can add
Into it. Go to the mainwindow.h to save the change (when you do a go to slot, it create a method linked with the signal you asked for. It define the function in the .h but don't save it. So you should go to the file and save it).
And now when you run your application and press the button, you can see the new message (if you still see the old one, is that you didn't remove the connect).
We can also add an int, double, etc in our label thanks to the
QVariant
which is an awesome class which can convert many thing in many others things. So left add an int which increase when we push the button.So the .h:
The .cpp:
Qt Creator Open Source Download
And now, we can save and run again. Every time you click on the button, it show 'it's even easier ! ' with the value of _smallCounter. So you should have something like:
This tutorial is done. If you want to learn more about Qt, let's see the other examples and documentation of Qt on the StackOverflow Documentation or the Qt Documentation
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