PyQt5 Button issue

Samuel Bachorik · wrote on 30 Mar 2020, 20:07

Hello dear users, i am new in Qt and i want to ask little complicated question. Let me explain it. I have simple program where i have label with text and button. When i click button text in label changes. Is possible to make this button work more times ? I mean if i click 3 times my button label will change 3 times to something else.

Thank you a lot for your help !!!

SGaist · wrote on 30 Mar 2020, 20:10

Hi and welcome to devnet,

Yes it is possible. What exactly do you have in mind ?

Samuel Bachorik · wrote on 30 Mar 2020, 20:18

Hello SGaist thank you for your fast reply. I am trying to make quiz in PyQt5. And it consists of - Button, label and textbox. Iam trying to make this work like - My label shows question and i should put correct answer to the textbox and click button to change question and store answer from text box as variable. I have also same problem with that textbox, when i want to store input from textbox as variable it work only with first question. For other it is not working. Do you know what i mean ? This quiz works for me if i make for every question new button new text box and new label. And i think that is not the right way.

SGaist · wrote on 30 Mar 2020, 20:20

Well it makes me a bit think about QWizard.

In any case, where are you getting your questions and answer from ?

Samuel Bachorik · wrote on 30 Mar 2020, 20:30

I defined them in code. I just need to i dont know how to say it but kind of refresh my all widgets or how to call that.
I need to use them for 3 questions. When i put answer to textbox i store this value with self.textboxValue1 = self.textbox.text(). But when i try to store second value with same textbox it is still first value so i have no idea how to store two different values from one text box. Same with button. I am sorry for replying with delay but i am a new member and i can post only every 10 minutes.

SGaist · wrote on 30 Mar 2020, 21:05

Since you have a list, just increment the index you use to retrieve the data each time you click on the button and update the UI using that updated index.

Samuel Bachorik · 31 Mar 2020, 07:15

Thank you for your help guys. Let me show you mine button and function.

self.label = QtWidgets.QLabel(self)
self.label.setText(str(self.question_prompts[0]))
self.label.move(23, 30)
self.update()

    self.b1 = QtWidgets.QPushButton(self)
    self.b1.setText("Enter")
    self.b1.move(130, 99)
    self.b1.resize(100, 32)
    self.b1.clicked.connect(self.clicked2)


    self.textbox = QLineEdit(self)
    self.textbox.move(20, 100)
    self.textbox.resize(100, 30)

    self.textboxValue1 = self.textbox.text()

HERE ARE MY WIDGETS

def clicked2(self):
    self.textboxValue1 = self.textbox.text()
    self.textbox.setText("")
    score = 0
    for i in self.question_prompts3:
        self.label.setText(i[0])
        self.update()

        if self.textboxValue1 == "a":
            score += 1
            self.label.setText("good")

        else:
            self.label.setText("bad")

AND HERE IS MY FUNCTION FOR BUTTON

What should i change ?

jsulm · wrote on 31 Mar 2020, 07:15

@Samuel-Bachorik Why do you have this loop inside clicked2()? In your class you should have a variable storing current index in self.question_prompts3. When user presses the button you increment this index and show next entry from self.question_prompts3 without any loops in clicked2():

def clicked2(self):
    if self.textbox.text() == self.question_prompts3[self.currentIndex][1]:
        self.score += 1

    self.textbox.setText("")
    self.currentIndex += 1
    self.label.setText( self.question_prompts3[self.currentIndex][0])

Samuel Bachorik · 31 Mar 2020, 08:25

When i make my program without Qt it looks like this, that is why i used for loop. I think this project is just too much for me :D I just cant get it to work. I can paste here full code if it can help.

jsulm · wrote on 31 Mar 2020, 08:25

@Samuel-Bachorik There is one important thing to learn when using asynchronous frameworks like Qt: such frameworks have an event loop and you should never block this loop. It can be hard at the beginning to learn and understand how such frameworks and aplications using them work. But once you understood the basics it is not hard any-more :-)
In your non-Qt app such a loop works perfectly, but not in an asynchronous/event-loop based application.

"I just cant get it to work" - keep trying and ask here if you have problems :-)

Samuel Bachorik · 31 Mar 2020, 11:33

Understand, so my last question is. Do you have any example code which have button that is able to change label to something else so many times as i want ? This is my biggest problem i do not know how to make button useable more times. i dont know for example when click first time change label to this. If i click second time do this. If i click third time do this.

Thank you again for your time man. I really appreciate it.

jsulm · wrote on 31 Mar 2020, 11:33

@Samuel-Bachorik Did you check the code I provided above? It should show next question each time you press the button. It is not complete as I don not initialise self.currentIndex and don't check whether it is still in range, but this exercise is up to you :-)

Samuel Bachorik · wrote on 31 Mar 2020, 11:40

THANK YOU !!!