QPushButton won't top align in QGridLayout

ImDevinC

I have a QVBoxLayout that contains a top-aligned QLineEdit and a top-aligned QWidget with the layout set as a QGridLayout. I then programmatically add top-aligned QPushButtons to the QGridLayout depending on user input. This all works, but the problem I'm having is that the QPushButton does not top-align in the QGridLayout. Here's some code snippets I'm hoping will help.

Main Layout

this->m_filterBox = new QLineEdit(tr(""));
this->m_filterBox->setPlaceholderText(tr("Filter"));
connect(m_filterBox, &QLineEdit::textChanged, this, &CMainWindow::filterChanged);
QVBoxLayout *layout = new QVBoxLayout();
layout->addWidget(m_filterBox);
layout->setAlignment(this->m_filterBox, Qt::AlignTop);
this->m_keyGrid = new QGridLayout();
QWidget *gridWidget = new QWidget();
gridWidget->setLayout(this->m_keyGrid);
layout->addWidget(gridWidget);
layout->setAlignment(gridWidget, Qt::AlignTop);
QWidget *window = new QWidget(this);
window->setLayout(layout);
this->setCentralWidget(window);

Adding buttons

int row = 0;
int column = 0;
for(std::vector<QString>::iterator it = this->m_vecStrings.begin(); it != this->m_vecStrings.end(); ++it) {
    QString input = *it;
    QPushButton *button = new QPushButton(input);
    this->m_keyGrid->addWidget(button, row, column, 1, 1, Qt::AlignTop);
    column++;
    if (column > 2) {
        row++;
        column = 0;
    }
}

Any insight is appreciated. Here's a screenshot of what I'm getting for more information

MaxDevI

So you want the pushbuttons right beneath the lineEdit? See this

"If the stretch factor is 0 and nothing else in the QBoxLayout has a stretch factor greater than zero, the space is distributed according to the QWidget:sizePolicy() of each widget that's involved.

The alignment is specified by alignment. The default alignment is 0, which means that the widget fills the entire cell."
http://doc.qt.io/qt-5/qboxlayout.html

Let me know if that helps

EDIT: Also, have a look at http://doc.qt.io/qt-5/qlayout.html#spacing-prop

Maybe you can try setting the spacing of the rows to be small so that the buttons appear near top

ImDevinC

Thanks @MaxDevI, that worked perfectly!