Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. Mobile and Embedded
  4. Advice about the application I will be making? (I'm a beginner)
Forum Updated to NodeBB v4.3 + New Features

Advice about the application I will be making? (I'm a beginner)

Scheduled Pinned Locked Moved Unsolved Mobile and Embedded
77 Posts 6 Posters 25.2k Views 2 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • D dvlpr.bernard

    @mrjj
    Uhmmm. Yes, I did recognize that stylesheet it's kinda like css or maybe it is a true css.
    I'll take note of that QDialog.

    No, I had not used a database before and sqlite sounds interesting to me. Is it the key to manage my data? I'll take note of that.

    Yes, it is for a phone. Thank you again for your response :)

    mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by
    #7

    @dvlpr.bernard
    ah. well while QWidgets are also fine for phone apps, there is also QML
    https://doc.qt.io/qt-5/qtqml-index.html
    Which was designed for the mobile generation.
    It allows much freedom in look and fell and are fully touch enabled and optimized for mobile usage.
    It is however, very different from c++.

    I suggest you try it out and see if that would not be a better fit.
    https://qmlbook.github.io/

    some c++ might be needed to create the data backend.

    But much of the logic will be javascript.

    D 1 Reply Last reply
    3
    • mrjjM mrjj

      @dvlpr.bernard
      ah. well while QWidgets are also fine for phone apps, there is also QML
      https://doc.qt.io/qt-5/qtqml-index.html
      Which was designed for the mobile generation.
      It allows much freedom in look and fell and are fully touch enabled and optimized for mobile usage.
      It is however, very different from c++.

      I suggest you try it out and see if that would not be a better fit.
      https://qmlbook.github.io/

      some c++ might be needed to create the data backend.

      But much of the logic will be javascript.

      D Offline
      D Offline
      dvlpr.bernard
      wrote on last edited by
      #8

      @mrjj
      I see. Is there a touch-enabled for QT Widget Application? Or the user wouldn't be able to feel that it is made for mobile and not for desktop?

      I actually have no time to learn many things because of the deadline. Less than a month it will be presented in our school so what do you think is the best cave to go in to?

      mrjjM 1 Reply Last reply
      0
      • D dvlpr.bernard

        @mrjj
        I see. Is there a touch-enabled for QT Widget Application? Or the user wouldn't be able to feel that it is made for mobile and not for desktop?

        I actually have no time to learn many things because of the deadline. Less than a month it will be presented in our school so what do you think is the best cave to go in to?

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by
        #9

        @dvlpr.bernard
        hi
        Well QWidgets does support touch to some degree. Like clicking/pressing,
        but not so much slide/swipe and the other normal mobile gestures.
        Also scrollbars and the like are default too small to use. (but its fixable)

        Well if you know javascript besides c++ then QML is pretty smooth.
        If you have not worked with javascript and c++ is more your thing, i would
        go with QWidgets.

        That said. If you know web development, have you considered a browser-based solution?

        What is your main programming language ?

        1 Reply Last reply
        4
        • D Offline
          D Offline
          dvlpr.bernard
          wrote on last edited by
          #10

          I will consider looking at QML. QWidget was my first choice for now.

          My main programming language is C++. I have not done any javascript before. And I probably don't wanna go with browser-based solution because the required language for our project is c++.

          mrjjM 1 Reply Last reply
          0
          • D dvlpr.bernard

            I will consider looking at QML. QWidget was my first choice for now.

            My main programming language is C++. I have not done any javascript before. And I probably don't wanna go with browser-based solution because the required language for our project is c++.

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #11

            @dvlpr.bernard
            Ok, c++ it is.
            The Stacked widget should work fine.
            However, regarding the sqllite database. Im not sure its worth digging into
            SQL for mere 75 questions.
            You could just as easy store it in a text file or for a bit more structure use JSON which
            Qt has direct support for.

            D 4 Replies Last reply
            4
            • mrjjM mrjj

              @dvlpr.bernard
              Ok, c++ it is.
              The Stacked widget should work fine.
              However, regarding the sqllite database. Im not sure its worth digging into
              SQL for mere 75 questions.
              You could just as easy store it in a text file or for a bit more structure use JSON which
              Qt has direct support for.

              D Offline
              D Offline
              dvlpr.bernard
              wrote on last edited by
              #12

              @mrjj
              Sorry but, can you Elaborate? I don't need SQLite because JSON could do the work for me?
              Thank you :)

              1 Reply Last reply
              0
              • mrjjM mrjj

                @dvlpr.bernard
                Ok, c++ it is.
                The Stacked widget should work fine.
                However, regarding the sqllite database. Im not sure its worth digging into
                SQL for mere 75 questions.
                You could just as easy store it in a text file or for a bit more structure use JSON which
                Qt has direct support for.

                D Offline
                D Offline
                dvlpr.bernard
                wrote on last edited by
                #13

                @mrjj
                Hi. I will try to learn QML. What do you think is the best fit for my app the QT Quick Application - Stack or QT Quick Application - Swipe?
                And what are the best resources to learn it out there?

                Thank you again in advance :)

                1 Reply Last reply
                0
                • D Offline
                  D Offline
                  dvlpr.bernard
                  wrote on last edited by
                  #14

                  QML seems pretty gorgeous with the user interface. But how am I'm going to work with the back-end kinda stuff??

                  1 Reply Last reply
                  0
                  • mrjjM mrjj

                    @dvlpr.bernard
                    Ok, c++ it is.
                    The Stacked widget should work fine.
                    However, regarding the sqllite database. Im not sure its worth digging into
                    SQL for mere 75 questions.
                    You could just as easy store it in a text file or for a bit more structure use JSON which
                    Qt has direct support for.

                    D Offline
                    D Offline
                    dvlpr.bernard
                    wrote on last edited by
                    #15

                    @mrjj
                    If Javascript is the language for QML then that would be bad because the required languange for the app is c++.

                    KillerSmathK 1 Reply Last reply
                    0
                    • D dvlpr.bernard

                      @mrjj
                      If Javascript is the language for QML then that would be bad because the required languange for the app is c++.

                      KillerSmathK Offline
                      KillerSmathK Offline
                      KillerSmath
                      wrote on last edited by
                      #16

                      @dvlpr.bernard
                      You could write the backend on c++ and expose an object from C++ to QML.
                      https://doc.qt.io/qt-5/qtqml-cppintegration-contextproperties.html
                      https://doc.qt.io/qt-5/qtqml-cppintegration-exposecppattributes.html.

                      @Computer Science Student - Brazil
                      Web Developer and Researcher
                      “Sometimes it’s the people no one imagines anything of who do the things that no one can imagine.” - Alan Turing

                      1 Reply Last reply
                      5
                      • mrjjM mrjj

                        @dvlpr.bernard
                        Ok, c++ it is.
                        The Stacked widget should work fine.
                        However, regarding the sqllite database. Im not sure its worth digging into
                        SQL for mere 75 questions.
                        You could just as easy store it in a text file or for a bit more structure use JSON which
                        Qt has direct support for.

                        D Offline
                        D Offline
                        dvlpr.bernard
                        wrote on last edited by
                        #17

                        @mrjj Good day sir!

                        I was just wondering how am I going to present the data? Should I store all the interface in one Stack Widget or do I need another window or another Stack Widget? :)

                        And also I consider looking at SQLite. Where would I store the questions kinda thing or the output to compare to the user input? Thank you again in advance :)
                        0_1555859866247_0c9e3a4f-a3af-45bd-8af3-b4e50e870d9c-image.png

                        KillerSmathK 1 Reply Last reply
                        0
                        • D Offline
                          D Offline
                          dvlpr.bernard
                          wrote on last edited by
                          #18

                          Or it should look like these?
                          What are the things I need to consider :)

                          0_1555861384574_636d3370-b62b-4ed1-9b49-cdc8e65c107e-image.png

                          1 Reply Last reply
                          0
                          • mrjjM Offline
                            mrjjM Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on last edited by
                            #19

                            Hi
                            Last table looks ok. I assume then all question is a topic and the answer is some
                            text. No mutiple choice or anything like that ?

                            Since we will have few questions (75) its ok to include the difficult_level
                            as text. If we were to have thousands of questions, it would be better to have a table for the texts ( Beginner, Average etc) and reference it from Question table.
                            However, we just directly included it here for simplicity.

                            Next step could be to try use table in Qt
                            https://doc.qt.io/qt-5/qtsql-index.html
                            https://katecpp.wordpress.com/2015/08/28/sqlite-with-qt/

                            Things to consider:
                            Define the operations you need, like
                            select questions from a diff_level
                            keeping track of already used questions (if needed ?)

                            D 1 Reply Last reply
                            6
                            • D dvlpr.bernard

                              @mrjj Good day sir!

                              I was just wondering how am I going to present the data? Should I store all the interface in one Stack Widget or do I need another window or another Stack Widget? :)

                              And also I consider looking at SQLite. Where would I store the questions kinda thing or the output to compare to the user input? Thank you again in advance :)
                              0_1555859866247_0c9e3a4f-a3af-45bd-8af3-b4e50e870d9c-image.png

                              KillerSmathK Offline
                              KillerSmathK Offline
                              KillerSmath
                              wrote on last edited by
                              #20

                              I was just wondering how am I going to present the data? Should I store all the interface in one Stack Widget or do I need another window or another Stack Widget? :)

                              I suppose you pretent to use QML. So you can store the data in a model and display components on window depending of your data.

                              Swipe View
                              Stack View

                              Below is a idea of how you could to implement it with Swipe View (No Interative Mode)

                              // Qt 5.11
                              import QtQuick 2.11
                              import QtQuick.Window 2.11
                              import QtQuick.Controls 2.2
                              import QtQuick.Layouts 1.11
                              
                              Window {
                                  visible: true
                                  width: 640
                                  height: 480
                                  title: qsTr("Hello World")
                              
                                  ListModel{
                                      id: databaseModel
                                      ListElement{
                                          topic: "While Loop"
                                          dificulty: 3
                                          question_num: 3
                                          question_text: "While Loop 3,3"
                                      }
                              
                                      ListElement{
                                          topic: "While Loop"
                                          dificulty: 3
                                          question_num: 4
                                          question_text: "While Loop 3,4"
                                      }
                                  }
                              
                                  SwipeView {
                                      id: view
                                      anchors.fill: parent
                                      anchors.bottomMargin: 20
                                      interactive: false
                                      currentIndex: pageIndicator.currentIndex
                                      Repeater {
                                          model: databaseModel
                                          Loader {
                                              active: SwipeView.isCurrentItem || SwipeView.isNextItem || SwipeView.isPreviousItem
                                              sourceComponent: Page{
                                                  Rectangle{
                                                      width: view.width / 2
                                                      height: view.height / 2
                                                      color: "white"
                                                      anchors.centerIn: parent
                              
                                                      Text{
                                                          anchors.centerIn: parent
                                                          text: "Question: " + model.question_text
                                                      }
                                                  }
                                              }
                                          }
                                      }
                                  }
                              
                                  PageIndicator {
                                      id: pageIndicator
                                      count: databaseModel.count
                                      interactive: true
                                      currentIndex: 0
                                      anchors.bottom: parent.bottom
                                      anchors.horizontalCenter: parent.horizontalCenter
                              
                                  }
                              
                              }
                              

                              Note: the listModel (Data) and Game Logic can be implemented from c++.

                              And also I consider looking at SQLite. Where would I store the questions kinda thing or the output to compare to the user input? Thank you again in advance :)

                              Firstly, it may be implement of several ways...
                              You can insert a Json text with correct_answer index and answers.
                              Or create an array of text and correct_answer field (i'm not sure how it could be implemented).

                              Json Example:

                              {
                                 "correct_answer": 0,
                                 "answers": [
                                    "Answer 1",
                                    "Answer 2",
                                    "Answer 3"
                                 ]
                              }
                              

                              Also, the difficulty_level don't need to be a string field. You can storage an intenger number 1-3 and interpret it in your app. 1 -> Beginner, 2 -> Intermediate.

                              I recommend you to read these materials to understand the Relational Database Concepts:
                              Telvents - RDBMS Concepts
                              TutorialsPoint - RDBMS Concepts

                              @Computer Science Student - Brazil
                              Web Developer and Researcher
                              “Sometimes it’s the people no one imagines anything of who do the things that no one can imagine.” - Alan Turing

                              D 1 Reply Last reply
                              2
                              • mrjjM mrjj

                                Hi
                                Last table looks ok. I assume then all question is a topic and the answer is some
                                text. No mutiple choice or anything like that ?

                                Since we will have few questions (75) its ok to include the difficult_level
                                as text. If we were to have thousands of questions, it would be better to have a table for the texts ( Beginner, Average etc) and reference it from Question table.
                                However, we just directly included it here for simplicity.

                                Next step could be to try use table in Qt
                                https://doc.qt.io/qt-5/qtsql-index.html
                                https://katecpp.wordpress.com/2015/08/28/sqlite-with-qt/

                                Things to consider:
                                Define the operations you need, like
                                select questions from a diff_level
                                keeping track of already used questions (if needed ?)

                                D Offline
                                D Offline
                                dvlpr.bernard
                                wrote on last edited by
                                #21

                                @mrjj
                                Good day!
                                Yes, there is no multiple choice included. The user is required to type the output of the set of code that will be displayed.

                                As of now, this is how I visualize the logic or the structure of the app (Please let me know if there are some weaknesses or if this will not gonna work or if there is a better way of doing it):

                                1. The user will need to choose and click the button(topic name) which has the code that will declare the variable or an object(I don't know what should I use) and will store a data in it.
                                  Example: When the user click the If Statement then int Topic = 1 or string Topic = "IF";

                                2. When the user click the Beginner button then int Dif_Lvl = 1 or string Dif_Lvl= "Beginner";

                                3. When the user input the number and click Next button then int Number_Of_Questions = user_input;
                                  Print_Question(Topic, Dif_Lvl, Number_Of_Questions);
                                  The Print_Question function contains the query and a loop to display the next pages depending on the user topic/dif_lvl.

                                Do I need objects and classes (not that familiar with that) or mostly I would use functions?

                                0_1555948631684_414b12ee-58f3-411b-b62a-67e630a2173d-image.png

                                Thanks :)

                                1 Reply Last reply
                                0
                                • KillerSmathK KillerSmath

                                  I was just wondering how am I going to present the data? Should I store all the interface in one Stack Widget or do I need another window or another Stack Widget? :)

                                  I suppose you pretent to use QML. So you can store the data in a model and display components on window depending of your data.

                                  Swipe View
                                  Stack View

                                  Below is a idea of how you could to implement it with Swipe View (No Interative Mode)

                                  // Qt 5.11
                                  import QtQuick 2.11
                                  import QtQuick.Window 2.11
                                  import QtQuick.Controls 2.2
                                  import QtQuick.Layouts 1.11
                                  
                                  Window {
                                      visible: true
                                      width: 640
                                      height: 480
                                      title: qsTr("Hello World")
                                  
                                      ListModel{
                                          id: databaseModel
                                          ListElement{
                                              topic: "While Loop"
                                              dificulty: 3
                                              question_num: 3
                                              question_text: "While Loop 3,3"
                                          }
                                  
                                          ListElement{
                                              topic: "While Loop"
                                              dificulty: 3
                                              question_num: 4
                                              question_text: "While Loop 3,4"
                                          }
                                      }
                                  
                                      SwipeView {
                                          id: view
                                          anchors.fill: parent
                                          anchors.bottomMargin: 20
                                          interactive: false
                                          currentIndex: pageIndicator.currentIndex
                                          Repeater {
                                              model: databaseModel
                                              Loader {
                                                  active: SwipeView.isCurrentItem || SwipeView.isNextItem || SwipeView.isPreviousItem
                                                  sourceComponent: Page{
                                                      Rectangle{
                                                          width: view.width / 2
                                                          height: view.height / 2
                                                          color: "white"
                                                          anchors.centerIn: parent
                                  
                                                          Text{
                                                              anchors.centerIn: parent
                                                              text: "Question: " + model.question_text
                                                          }
                                                      }
                                                  }
                                              }
                                          }
                                      }
                                  
                                      PageIndicator {
                                          id: pageIndicator
                                          count: databaseModel.count
                                          interactive: true
                                          currentIndex: 0
                                          anchors.bottom: parent.bottom
                                          anchors.horizontalCenter: parent.horizontalCenter
                                  
                                      }
                                  
                                  }
                                  

                                  Note: the listModel (Data) and Game Logic can be implemented from c++.

                                  And also I consider looking at SQLite. Where would I store the questions kinda thing or the output to compare to the user input? Thank you again in advance :)

                                  Firstly, it may be implement of several ways...
                                  You can insert a Json text with correct_answer index and answers.
                                  Or create an array of text and correct_answer field (i'm not sure how it could be implemented).

                                  Json Example:

                                  {
                                     "correct_answer": 0,
                                     "answers": [
                                        "Answer 1",
                                        "Answer 2",
                                        "Answer 3"
                                     ]
                                  }
                                  

                                  Also, the difficulty_level don't need to be a string field. You can storage an intenger number 1-3 and interpret it in your app. 1 -> Beginner, 2 -> Intermediate.

                                  I recommend you to read these materials to understand the Relational Database Concepts:
                                  Telvents - RDBMS Concepts
                                  TutorialsPoint - RDBMS Concepts

                                  D Offline
                                  D Offline
                                  dvlpr.bernard
                                  wrote on last edited by
                                  #22

                                  @KillerSmath
                                  Good day! Thank you for your response.
                                  As of now, I have not learned QML yet. I only know the basic of QT Widget Application and I also tried the Stack Widget in it. QML seems pretty daunting to me for now but I will consider peeking and see if I could work on it.

                                  Sadly I need to finish this app within 3 weeks from now or else I would not meet the deadline. I think I wouldn't be able to dig deep into things because that would eat up my time.

                                  1 Reply Last reply
                                  0
                                  • mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #23

                                    @dvlpr.bernard said in Advice about the application I will be making? (I'm a beginner):

                                    Do I need objects and classes (not that familiar with that) or mostly I would use functions?

                                    You will be mostly used classes since all Widgets are classes.
                                    the Print_Question should be a member function to the MainWindow so
                                    it can access the widgets. You can use QLabel for the topic (call setText on it)
                                    and QPlainTextEdit for the user / answer input.
                                    The design looks fine. You can realize it with a stacked widget.

                                    for both the Topic and Level selection, you have 2 options.
                                    1: as soon as the user click button, its selected and page is changed.
                                    2: You set Checkable on the buttons, so they are like a checkbox ( can be selected) and
                                    first when user press next, the page is changed.

                                    D 1 Reply Last reply
                                    2
                                    • mrjjM mrjj

                                      @dvlpr.bernard said in Advice about the application I will be making? (I'm a beginner):

                                      Do I need objects and classes (not that familiar with that) or mostly I would use functions?

                                      You will be mostly used classes since all Widgets are classes.
                                      the Print_Question should be a member function to the MainWindow so
                                      it can access the widgets. You can use QLabel for the topic (call setText on it)
                                      and QPlainTextEdit for the user / answer input.
                                      The design looks fine. You can realize it with a stacked widget.

                                      for both the Topic and Level selection, you have 2 options.
                                      1: as soon as the user click button, its selected and page is changed.
                                      2: You set Checkable on the buttons, so they are like a checkbox ( can be selected) and
                                      first when user press next, the page is changed.

                                      D Offline
                                      D Offline
                                      dvlpr.bernard
                                      wrote on last edited by
                                      #24

                                      @mrjj
                                      Good day!

                                      Is it possible to store a long string in SQLite database or maybe an image? I need it for the questions or do I?

                                      0_1556191665411_732ce764-c6ca-43bb-9503-7d7f32a626a5-image.png

                                      mrjjM 1 Reply Last reply
                                      0
                                      • D dvlpr.bernard

                                        @mrjj
                                        Good day!

                                        Is it possible to store a long string in SQLite database or maybe an image? I need it for the questions or do I?

                                        0_1556191665411_732ce764-c6ca-43bb-9503-7d7f32a626a5-image.png

                                        mrjjM Offline
                                        mrjjM Offline
                                        mrjj
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #25

                                        Hi
                                        Storing text in Sqllite should just work. use the TEXT type for the column.

                                        Im not sure what you would need any images for ?

                                        D 1 Reply Last reply
                                        0
                                        • mrjjM mrjj

                                          Hi
                                          Storing text in Sqllite should just work. use the TEXT type for the column.

                                          Im not sure what you would need any images for ?

                                          D Offline
                                          D Offline
                                          dvlpr.bernard
                                          wrote on last edited by
                                          #26

                                          Okay, did you mean this string? I already tried it but it didn't work I think it is one liner meaning I can't put two or more line data.

                                          0_1556192247323_cb9def4a-6675-4b99-9615-d7151c9d178c-image.png

                                          I want store an image to make it look more a real code rather than just a plain text, but if it is not possible thats fine.
                                          0_1556192503849_c8f12403-d6c9-48af-bb84-37ba1b9cdfa5-image.png

                                          mrjjM 1 Reply Last reply
                                          0

                                          • Login

                                          • Login or register to search.
                                          • First post
                                            Last post
                                          0
                                          • Categories
                                          • Recent
                                          • Tags
                                          • Popular
                                          • Users
                                          • Groups
                                          • Search
                                          • Get Qt Extensions
                                          • Unsolved