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Thread: keyboard event + qlabel rerending problem

  1. 28th August 2012, 20:31 #1
    hedlabel
    hedlabel is offline Beginner
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    Default keyboard event + qlabel rerending problem

    Hey guys, I'm just having a weird problem when I try to change qlabels focus with the keyboard. My problem is, I have 4 qlabels like a gridlayout with 2 columns and 2 rows. Since my application doesn't have a touchscreen display I had to override the keyPressEvent to manipulate the keyboard events. The problem is, when any directional key to change the selected label it doesn't rerender it, but if I press another key, the label just rerender as I want! I just debugged it and the label got the focus, but don't rerender the image. That's my code:

    PS: I'll do some code refactoring on the code, I just did that do make easier(or not) to see what's the problem.

    Qt Code: 
    1. //Refact THIS!!! 
    2. void MenuWindow::keyPressEvent(QKeyEvent *event){
    3.     if(event->key() == Qt::Key_Escape){
    4.         back->setFocus();
    5.         return;
    6.     }
    7.  
    8.     if(configLabel->hasFocus()){
    9.         //REFATORAR. EXTRACT METHOD
    10.         cout << "CONFIG LABEL COM FOCO!" << endl;
    11.         configLabelImage->load(STRING_PATH_TO_IMAGES+"icone_configuracoes_selected.png");
    12.         if(event->key() == Qt::Key_Down){
    13.             configLabelImage->load(STRING_PATH_TO_IMAGES+"icone_configuracoes.png");
    14.             storageLabel->setFocus();
    15.         }else if(event->key() == Qt::Key_Right){
    16.             configLabelImage->load(STRING_PATH_TO_IMAGES+"icone_configuracoes.png");
    17.             multimediaLabel->setFocus();
    18.         }
    19.         configLabel->setPixmap(QPixmap::fromImage(*configLabelImage));
    20.     }else if(multimediaLabel->hasFocus()){
    21.         cout << "MULTI LABEL COM FOCO!" << endl;
    22.         multimediaLabelImage->load(STRING_PATH_TO_IMAGES+"icone_multimedia_selected.png");
    23.         if(event->key() == Qt::Key_Down){
    24.             multimediaLabelImage->load(STRING_PATH_TO_IMAGES+"icone_multimedia.png");
    25.             energyLabel->setFocus();
    26.         }else if(event->key() == Qt::Key_Left){
    27.             multimediaLabelImage->load(STRING_PATH_TO_IMAGES+"icone_multimedia.png");
    28.              configLabel->setFocus();
    29.         }
    30.         multimediaLabel->setPixmap(QPixmap::fromImage(*multimediaLabelImage));
    31.     }else if(storageLabel->hasFocus()){
    32.         cout << "STORAGE LABEL COM FOCO!" << endl;
    33.         storageLabelImage->load(STRING_PATH_TO_IMAGES+"icone_armazenamento_selected.png");
    34.         if(event->key() == Qt::Key_Up){
    35.             storageLabelImage->load(STRING_PATH_TO_IMAGES+"icone_armazenamento.png");
    36.             configLabel->setFocus();
    37.         }else if(event->key() == Qt::Key_Right){
    38.             storageLabelImage->load(STRING_PATH_TO_IMAGES+"icone_armazenamento.png");
    39.             energyLabel->setFocus();
    40.         }else if(event->key() == Qt::Key_Down){
    41.             storageLabelImage->load(STRING_PATH_TO_IMAGES+"icone_armazenamento.png");
    42.             select->setFocus();
    43.         }
    44.         storageLabel->setPixmap(QPixmap::fromImage(*storageLabelImage));
    45.     }else if(energyLabel->hasFocus()){
    46.         cout << "ENERGy LABEL COM FOCO!" << endl;
    47.         energyLabelImage->load(STRING_PATH_TO_IMAGES+"icone_energia_selected.png");
    48.         if(event->key() == Qt::Key_Up){
    49.             energyLabelImage->load(STRING_PATH_TO_IMAGES+"icone_energia.png");
    50.             multimediaLabel->setFocus();
    51.         }else if(event->key() == Qt::Key_Left){
    52.             energyLabelImage->load(STRING_PATH_TO_IMAGES+"icone_energia.png");
    53.             storageLabel->setFocus();
    54.         }else if(event->key() == Qt::Key_Down){
    55.             energyLabelImage->load(STRING_PATH_TO_IMAGES+"icone_energia.png");
    56.             select->setFocus();
    57.         }
    58.         energyLabel->setPixmap(QPixmap::fromImage(*energyLabelImage));
    59.     }else if(select->hasFocus()){
    60.         cout << "SELECT COM FOCO" << endl;
    61.         if(event->key() == Qt::Key_Up){
    62.             storageLabel->setFocus();
    63.         }else if(event->key() == Qt::Key_Right){
    64.             back->setFocus();
    65.         }
    66.     }else if(back->hasFocus()){
    67.         cout << "BACK COM FOCO" << endl;
    68.         if(event->key() == Qt::Key_Up){
    69.             energyLabel->setFocus();
    70.         }else if(event->key() == Qt::Key_Left){
    71.             select->setFocus();
    72.         }
    73.     }
    74.  
    75. }
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    Tks in advance!
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  2. 29th August 2012, 08:39 #2
    high_flyer
    high_flyer is offline Wiseguy
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    Default Re: Вот , что хочу сказать...

    @Rource:
    This is an English speaking forum, please use English - as people from all over the world use it, an most non Russians can't read non English posts.
    I will let you some time to rewrite your post in English, if not, I will delete it.
    ==========================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.
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