I'm looking to build a question form in Qt. As there are several questions to be answered, it is necessary to allow the scrolling of the form, so I used a QScrollArea . The questions are all answered in a Likert scale, so I adjusted the alignment of the layout that contains them to the left and spaced out the options manually. That is, everything is left aligned . I've also implemented an alternate colored style, just to make it more enjoyable for the user to differentiate questions by scrolling through the form.
Here is an image of the MCVE that I have prepared (and is below). The main problem is that I can not get this "zebra" to extend to the end of the form (on the right, indicated in the blue box in the image). There is also the space that looks like a margin on the left (indicated in the red box).
Tosolvethemainproblem,I'vetriedtochangethesizeconstraintsofchildlayouts(usingsetSizeConstraint)andevenaddastretch(stretch)afterthelastoptionnoteinthelineofcodemarkedwithcomment),butnoneoftheseoptionsworks.Andforthesecondaryproblem,well,I'vetriedtochangethemarginsviastylesheet(asitisinthecode)andevenusethesetMarginmethodoftheQWidgetclassitself,butnothingworks.
Whatworksforthemainproblemistosetaminimumorfixedsizefortheoptionscontainer(theobjectinpRow),butIcannotusethisoptionbecausethewindowcanhavethesizesetbytheuserdependingonthescreendimensionsavailabletoit).Alsobecauseitdoesnotsolvethesecondaryproblem,andIwouldnotwanttocaptureresizingeventfromthewindowtoadjustthesizemanually-sincethenIlosetheadvantageofusinglayouts.
Anysuggestions?
MCVECode
#include<QApplication>#include<QWidget>#include<QRadioButton>#include<QVBoxLayout>#include<QHBoxLayout>#include<QFrame>#include<QLabel>#include<QRadioButton>#include<QScrollArea>#defineSTYLE_SHEET" \
QWidget#plainArea \
{ \
background-color: #ffffff; \
padding: 0px 0px 0px 0px; \
margin: 0px 0px 0px 0px; \
border-width: 0px; \
} \
\
QLabel#headerTitle \
{ \
font-size: 25px; } \
} \
\
QLabel#questionTitle \
{ \
font-size: 20px; \
} \
\
QRadioButton#optionTitle \
{ \
font-size: 16px; \
} \
\
QWidget#highlightedrow \
{ \
background-color: #efd3d2; \
} \
"
QWidget* createQuestionnaire(QWidget *pParent)
{
QWidget *pQuestionnaire = new QWidget(pParent);
pQuestionnaire->setObjectName("plainArea");
pQuestionnaire->setLayout(new QVBoxLayout());
pQuestionnaire->layout()->setAlignment(Qt::AlignTop);
// Cabeçalho
QLabel *pTitle = new QLabel("Por favor, responda às perguntas a seguir.", pQuestionnaire);
pTitle->setObjectName("headerTitle");
pQuestionnaire->layout()->addWidget(pTitle);
QFrame *pLine = new QFrame(pQuestionnaire);
pLine->setFrameStyle(QFrame::HLine);
pLine->setLineWidth(4);
pQuestionnaire->layout()->addWidget(pLine);
static_cast<QBoxLayout*>(pQuestionnaire->layout())->addSpacing(10);
// Scroll Area
QScrollArea *pScroll = new QScrollArea(pQuestionnaire);
pScroll->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
pScroll->setObjectName("plainArea");
pScroll->setLayout(new QVBoxLayout());
pQuestionnaire->layout()->addWidget(pScroll);
QWidget *pArea = new QWidget(pQuestionnaire);
pArea->setObjectName("plainArea");
pArea->setLayout(new QVBoxLayout());
pArea->layout()->setSizeConstraint(QLayout::SetMinAndMaxSize);
pScroll->setWidget(pArea);
// Questões
QStringList lFruits = {
"Abacate", "Amora", "Ameixa", "Acerola", "Abacaxi", "Açaí",
"Banana", "Bacuri", "Buriti", "Butiá", "Bacaba", "Carambola",
"Cajá", "Caju", "Cereja", "Cacau", "Caqui", "Cupuaçu", "Damasco",
"Figo", "Framboesa", "Fruta Pão", "Graviola", "Goiaba", "Goiaba Branca",
"Groselha", "Guaraná", "Grumixama", "Guariroba", "Ingá", "Ibapó",
"Itu", "Ingá Dedo", "Ingá Branco", "Jaca", "Jabuticaba", "Jambo",
"Jenipapo", "Jatobá", "Kiwi", "Laranja", "Limão", "Lima Doce",
"Lixia", "Melancia", "Mamão", "Melão", "Maracujá", "Manga",
"Macadâmia", "Maçã", "Mangaba", "Mexerica", "Nectarina", "Noz",
"Nêspera", "Olho-De-Boi", "Pera", "Pêssego", "Pitaya", "Pitanga",
"Pinha", "Pinhão", "Pitomba", "Pocã", "Quina", "Rabutan", "Romã",
"Sapoti", "Sapucaia", "Salok", "Saputá", "Tangerina", "Tomate",
"Tamarindo", "Toranja", "Taiúva", "Uva", "Uxi", "Uvaia", "Umbu",
"Veludo", "Wampi", "Xixá"
};
QStringList lOptions = { "detesto", "gosto pouco", "gosto", "gosto muito", "adoro" };
for(int i = 0; i < lFruits.size(); i++)
{
QWidget *pRow = new QWidget(pQuestionnaire);
pArea->layout()->addWidget(pRow);
if(i % 2)
pRow->setObjectName("highlightedrow");
pRow->setLayout(new QVBoxLayout());
QLabel *pQuestion = new QLabel(QString("%1 - Você gosta de %2?").arg(i+1).arg(lFruits.at(i)), pRow);
pQuestion->setObjectName("questionTitle");
pRow->layout()->addWidget(pQuestion);
QWidget *pOptions = new QWidget(pRow);
pRow->layout()->addWidget(pOptions);
pOptions->setLayout(new QHBoxLayout());
pOptions->layout()->setAlignment(Qt::AlignLeft);
static_cast<QBoxLayout*>(pOptions->layout())->addSpacing(60);
foreach(QString sOption, lOptions)
{
QRadioButton *pButton = new QRadioButton(sOption, pOptions);
pButton->setCursor(Qt::PointingHandCursor);
pButton->setObjectName("optionTitle");
pOptions->layout()->addWidget(pButton);
static_cast<QBoxLayout*>(pOptions->layout())->addSpacing(20);
}
static_cast<QBoxLayout*>(pOptions->layout())->addStretch(); // <--- Stretch não funciona!
}
return pQuestionnaire;
}
int main(int argc, char** argv)
{
QApplication oApp(argc, argv);
QWidget *pWindow = new QWidget();
pWindow->setObjectName("plainArea");
pWindow->setStyleSheet(STYLE_SHEET);
pWindow->setWindowTitle("MCVE para o SOPT");
pWindow->setLayout(new QVBoxLayout());
pWindow->layout()->addWidget(createQuestionnaire(pWindow));
pWindow->show();
pWindow->resize(800, 600);
return oApp.exec();
}
Q: Ah, how I hate Qt% with Qt, saw. rs
