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  4. How to create in QT main chat windows like this?

How to create in QT main chat windows like this?

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  • Q qwe3

    @mrjj One line and 2 problems aren't now problems :D Perfect!

    mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by
    #14

    @qwe3
    Super.
    Delegates are a bit complicated to begin with but later you love them as you can do anything you like.
    and then have good performance too \o/

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    0
    • Q Offline
      Q Offline
      qwe3
      wrote on last edited by
      #15

      @mrjj I create rounded rectangle and it works :)

      But I don't know how can I do the last thing:

      The message text can be longer than one line. I think I have to change row's height. This is not a problem: table->setRowHeight(1,240);

      But when I have to do that? In delegate functions()?

      mrjjM 1 Reply Last reply
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      • Q qwe3

        @mrjj I create rounded rectangle and it works :)

        But I don't know how can I do the last thing:

        The message text can be longer than one line. I think I have to change row's height. This is not a problem: table->setRowHeight(1,240);

        But when I have to do that? In delegate functions()?

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by
        #16

        @qwe3
        Hi
        Nope, its not the delegates job
        if its for all rows then

        QHeaderView *verticalHeader = myTableView->verticalHeader();
        verticalHeader->setSectionResizeMode(QHeaderView::Fixed);
        verticalHeader->setDefaultSectionSize(24);
        
        1 Reply Last reply
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        • Q Offline
          Q Offline
          qwe3
          wrote on last edited by
          #17

          @mrjj Thank you! I have to change your code to:

          verticalHeader->setSectionResizeMode(QHeaderView::ResizeToContents);
          

          But you helped me next time! :)

          Thank you

          mrjjM 1 Reply Last reply
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          • Q qwe3

            @mrjj Thank you! I have to change your code to:

            verticalHeader->setSectionResizeMode(QHeaderView::ResizeToContents);
            

            But you helped me next time! :)

            Thank you

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #18

            @qwe3
            Hi
            Super.
            Congratulation on your first Delegate.

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            • Q Offline
              Q Offline
              qwe3
              wrote on last edited by qwe3
              #19

              @mrjj Only in 50%.

              I need one more:

              QWidget *delegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option, const QModelIndex &index) const
              {
                  return nullptr;
              }
              
              void delegate::updateEditorGeometry(QWidget *editor, const QStyleOptionViewItem &option, const QModelIndex &index) const
              {
                  editor->setGeometry(option.rect);
              }
              
              void delegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
              {
                  if(index.row()%2==0 && index.column()!=1)
                  {
                      QPen pen2(Qt::yellow, 1);
                      painter->setPen(pen2);
                  
                      QPainterPath path;
                      path.addRoundedRect(QRectF(option.rect), 10, 10);
                      painter->fillPath(path, Qt::yellow);
                      painter->drawPath(path);
                      QPen pen(Qt::black, 1);
                      painter->setPen(pen);
                      painter->drawText(option.rect,Qt::AlignCenter, index.data().toString());
                  }
              }
              

              I would like to select text message, click on it right mouse button, get the list, where is "copy" and other possibilities. How can I do this?

              Now I can't select text and click right mouse button

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              • mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #20

                Hi
                For right click menu you can use a context menu

                https://forum.qt.io/topic/31233/how-to-create-a-custom-context-menu-for-qtableview/8

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                • Q Offline
                  Q Offline
                  qwe3
                  wrote on last edited by
                  #21

                  @mrjj Next small problem :)

                  I have now ( in the picture is small error - the third row have smaller rectangle ( whre is text "somethingABC ") - I change it in paint application; this rectangle have width like the others )

                  example4.png

                  My delegate:

                  path.addRoundedRect(QRectF(option.rect), 10, 10);
                  

                  When I change it to:

                  path.addRoundedRect(QRectF(option.rect.x(), option.rect.y(),option.rect.width()/2,option.rect.height()), 10, 10);
                  

                  I get:
                  example5.png

                  There are 3 columns in QTableView:
                  the first one for my messages
                  the second one - seperator
                  the third for other person's messages

                  I would like to align to right the third column - yellow rectangles. Like this:
                  example6.png

                  With the text there is not a problem:

                  painter->drawText(QRect(option.rect),Qt::AlignVCenter, index.data().toString());
                  

                  But function

                  painter->drawPath(path);
                  

                  doesn't have a parameter with alignments

                  mrjjM 1 Reply Last reply
                  0
                  • Q qwe3

                    @mrjj Next small problem :)

                    I have now ( in the picture is small error - the third row have smaller rectangle ( whre is text "somethingABC ") - I change it in paint application; this rectangle have width like the others )

                    example4.png

                    My delegate:

                    path.addRoundedRect(QRectF(option.rect), 10, 10);
                    

                    When I change it to:

                    path.addRoundedRect(QRectF(option.rect.x(), option.rect.y(),option.rect.width()/2,option.rect.height()), 10, 10);
                    

                    I get:
                    example5.png

                    There are 3 columns in QTableView:
                    the first one for my messages
                    the second one - seperator
                    the third for other person's messages

                    I would like to align to right the third column - yellow rectangles. Like this:
                    example6.png

                    With the text there is not a problem:

                    painter->drawText(QRect(option.rect),Qt::AlignVCenter, index.data().toString());
                    

                    But function

                    painter->drawPath(path);
                    

                    doesn't have a parameter with alignments

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by
                    #22

                    @qwe3
                    Hi
                    Only drawText uses align. Not other paint functions as far as i know :0

                    Since option.rect IS the cell, i think you just need to set
                    ui->table->horizontalHeader()->setStretchLastSection(true);

                    so the last col is actually to the far right

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                    • Q Offline
                      Q Offline
                      qwe3
                      wrote on last edited by qwe3
                      #23

                      @mrjj Thank you, I think I can use something like:

                      path.addRoundedRect(QRectF(option.rect.x()+100, option.rect.y(),option.rect.width()/2,option.rect.height()), 10, 10);
                      

                      for the last column.

                      But there is next problem :D

                      When I use:

                      table->verticalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
                      

                      I get the perfect height for cell (0,0). Perfect. But cell (0,1) must has the same height like cell (0,0), so it can be too big for cell (0,1).

                      mrjjM 1 Reply Last reply
                      0
                      • Q qwe3

                        @mrjj Thank you, I think I can use something like:

                        path.addRoundedRect(QRectF(option.rect.x()+100, option.rect.y(),option.rect.width()/2,option.rect.height()), 10, 10);
                        

                        for the last column.

                        But there is next problem :D

                        When I use:

                        table->verticalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
                        

                        I get the perfect height for cell (0,0). Perfect. But cell (0,1) must has the same height like cell (0,0), so it can be too big for cell (0,1).

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #24

                        @qwe3
                        Hi

                        • I get the perfect height for cell (0,0). Perfect. But cell (0,1) must has the same height like cell (0,0), so it can be too big for cell (0,1).

                        Im not really sure what you say here :)

                        1 Reply Last reply
                        0
                        • Q Offline
                          Q Offline
                          qwe3
                          wrote on last edited by
                          #25

                          example6.png
                          Please look at first row. In cell (0,0) there is text "somethingABC\ntext\njdsa". In cell ( 0,2 ) there is text "so". When I use

                          table->verticalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
                          

                          QT resize height of the first row to height which cell (0,0 ) needs. But cell (0,2) must have the same height. In cell (0,2) there is only text "so" , so it can have smaller height.

                          mrjjM 1 Reply Last reply
                          0
                          • Q qwe3

                            example6.png
                            Please look at first row. In cell (0,0) there is text "somethingABC\ntext\njdsa". In cell ( 0,2 ) there is text "so". When I use

                            table->verticalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
                            

                            QT resize height of the first row to height which cell (0,0 ) needs. But cell (0,2) must have the same height. In cell (0,2) there is only text "so" , so it can have smaller height.

                            mrjjM Offline
                            mrjjM Offline
                            mrjj
                            Lifetime Qt Champion
                            wrote on last edited by mrjj
                            #26

                            Hi
                            But that is what ResizeToContents does ?
                            So if it has lesser text, it will be smaller.

                            Do you want all to have same size regardless of text ?

                            ahh you mean the "so" should be smaller ?

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                            • Q Offline
                              Q Offline
                              qwe3
                              wrote on last edited by qwe3
                              #27

                              @mrjj
                              I would like something like that:

                              example7.png

                              mrjjM 1 Reply Last reply
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                              • Q qwe3

                                @mrjj
                                I would like something like that:

                                example7.png

                                mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on last edited by
                                #28

                                @qwe3
                                Hi
                                I think that will be hard as one row can only have one height.
                                https://doc.qt.io/archives/qt-4.8/qtableview.html#setRowHeight
                                but you can span cells to give them uneven sizes
                                void QTableView::setSpan(int row, int column, int rowSpanCount, int columnSpanCount)

                                But im wondering if it would not be easier to just use a QListView ( you can reuse delegate)
                                and have 2 of them .
                                one in each side and then just some white Qwidget in between ?

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                                • Q Offline
                                  Q Offline
                                  qwe3
                                  wrote on last edited by
                                  #29

                                  @mrjj I never used QListView. I don't need to use QTableView. But when I add 2 QListView there are two sliders to move? I would like to have only one like in QTableView ( on the right )

                                  mrjjM 1 Reply Last reply
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                                  • Q qwe3

                                    @mrjj I never used QListView. I don't need to use QTableView. But when I add 2 QListView there are two sliders to move? I would like to have only one like in QTableView ( on the right )

                                    mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by mrjj
                                    #30

                                    @qwe3
                                    Its just like TableView but just having one column.

                                    Then each row can be any height you wish pr item/shape and same for the right one.

                                    Else i think it get complicated to do with one tableView.
                                    You would have to make one row as hight as the biggest shape or merge cells to allow it to be uneven.
                                    Not easy in my book to calc that.
                                    But your call.

                                    Well its not so hard to make both scroll at same time

                                    connect(view1->horizontalScrollBar(), SIGNAL(valueChanged(int)), view2->horizontalScrollBar(), SLOT(setValue(int)));
                                    connect(view2->horizontalScrollBar(), SIGNAL(valueChanged(int)), view1->horizontalScrollBar(), SLOT(setValue(int)));
                                    

                                    and ofc you can just hide one of them if you wish

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                                    • Q Offline
                                      Q Offline
                                      qwe3
                                      wrote on last edited by
                                      #31

                                      @mrjj Hello,

                                      Could you tell me how will you do this GUI? Using QTableView, QListView or something other? At the moment please forget about 3 columns. Change it to only one column. In telegram application I see only one column for all people ( maybe two - the first one is for avatar in circle ). Do you know how it is done in telegram application? You told me that application has delegate. And it's using QListView too? What about the size of circle where is the text? How it is implemented that we have circle with text in other sizes?

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