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Thread: QFrame MousePressedEvent

  1. #1
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    Default QFrame MousePressedEvent

    I have a 10 X 10 square QFrame grid. my goal is to have a button to be checked for what color you want and then mouse over the frame and click and the QFrames background changes to the color that was selected.

    Qt Code:
    1. void matrix::REDBTN()
    2. {
    3. if (ui->REDbtn->isChecked())
    4. {
    5. ui->GREENbtn->setChecked(false);
    6. ui->BLUEbtn->setChecked(false);
    7. ui->WHITEbtn->setChecked(false);
    8. ui->PURPLEbtn->setChecked(false);
    9. ui->YELLOWbtn->setChecked(false);
    10. ui->CYANbtn->setChecked(false);
    11. if (ui->REDbtn->isChecked())
    12. {
    13. ui->box_0_0->mousePressEvent(setStyleSheet("background-color: rgb(255,0,0)"));
    14. }
    15. }
    16. }
    To copy to clipboard, switch view to plain text mode 
    i get an error when using this code. what am i doing wrong?

  2. #2
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    Default Re: QFrame MousePressedEvent

    Qt Code:
    1. if (ui->REDbtn->isChecked())
    2. {
    3. ui->box_0_0->mousePressEvent(setStyleSheet("background-color: rgb(255,0,0)"));
    4. }
    To copy to clipboard, switch view to plain text mode 

    what is this code supposed to do?
    mousePressEvent is an event handler, do you know what that means?
    Have you looked at the mousePressEvent() doc, to see which parameters it takes?
    mousePressEvent() is not supposed to be called like that directly.
    ==========================signature=============== ==================
    S.O.L.I.D principles (use them!):
    https://en.wikipedia.org/wiki/SOLID_...iented_design)

    Do you write clean code? - if you are TDD'ing then maybe, if not, your not writing clean code.

  3. #3
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    Default Re: QFrame MousePressedEvent

    i have and im lost on what im suppose to do it seems that i have to make mousePressEvent a void function and that works but i want it to be able to click on a box and if red button is checked make that box red.

    Qt Code:
    1. void matrix::mousePressEvent(QMouseEvent *event)
    2. {
    3. QFrame *frm = findChild<QFrame*>(QString("box_%2_%2").arg(event));
    4. if (frm)
    5. {
    6. frm->setStyleSheet("background-color: rgb(255,0,0)");
    7.  
    8. }
    9. }
    To copy to clipboard, switch view to plain text mode 

  4. #4
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    Default Re: QFrame MousePressedEvent

    Look, what you have said so far, and your code, suggest you don't know C++.
    C++ basic topics are off topic for this forum.
    ==========================signature=============== ==================
    S.O.L.I.D principles (use them!):
    https://en.wikipedia.org/wiki/SOLID_...iented_design)

    Do you write clean code? - if you are TDD'ing then maybe, if not, your not writing clean code.

  5. #5
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    Default Re: QFrame MousePressedEvent

    I do know C++! although i did not take a class on c++, its all self thought. If my labelling of things is wrong let me know. Don't assume i don't know some thing, i have gotten his far with QT and have made some fun useless apps. look here is my hole project in a zip. help me out don't bash. LED_Matrix.zip

  6. #6
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    Default Re: QFrame MousePressedEvent

    Consider putting your frames in a QTableWidget. It would simplify your code.
    Something like:
    Qt Code:
    1. ...
    2. tw = new QTableWidget(10,10,this);
    3. for(int row=0;row<10;++row)
    4. for(int col=0;col<10;++col){
    5. QFrame *frame = new QFrame;
    6. frame->setMaximumSize(50,50);
    7. frame->setMinimumSize(50,50);
    8. frame->setStyleSheet(//set color, corner radius etc//);
    9. tableWidget->setCellWidget(row,col,frame);
    10. }
    11. tableWidget->resizeColumnsToContents();
    12. tableWidget->resizeRowsToContents();
    13. connect(tableWidget,SIGNAL(cellClicked(int,int)),this,SLOT(yourSlot(int,int)));
    14. ...
    To copy to clipboard, switch view to plain text mode 
    Then in the slot change the color of the frame in the appropriate cell, according to which color button is checked, with QTableWidget->cellWidget(int, int). As an aside, a QComboBox might work better than QPushButtons for color selection.
    There might be a way to change all of the cells to the same color using style sheets but I think you will have to iterate over them to change the color.

  7. #7
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    Default Re: QFrame MousePressedEvent

    use QButtonGroup....
    And color button has a id.
    QButtonGroup::addButton ( QAbstractButton * button, int id )

    connect(buttonGroup, SIGNAL(buttonClicked ( int id )), frame, SLOT(setId(int id)));

    In your QFrame subclass, you can add a member int id
    void matrix::setId(int id)
    {
    this->id = id;
    }

    void matrix::mousePressEvent(QMouseEvent *event)
    {
    switch(id)
    {
    case 0: set red; break;
    case 1: set blue; break;
    .....
    }
    }

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