clearcombobox.cpp

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#include "./clearcombobox.h"
 
#include <QHBoxLayout>
#include <QStyle>
#include <QStyleOptionComboBox>
 
namespace QtUtilities {
 
static inline auto *getComboBoxLineEdit(QComboBox *comboBox)
{
    comboBox->setEditable(true);
    return comboBox->lineEdit();
}
 
ClearComboBox::ClearComboBox(QWidget *parent)
    : QComboBox(parent)
    , ButtonOverlay(this, getComboBoxLineEdit(this))
{
    ButtonOverlay::setClearButtonEnabled(true);
}
 
ClearComboBox::~ClearComboBox()
{
}
 
void ClearComboBox::handleTextChanged(const QString &text)
{
    updateClearButtonVisibility(!text.isEmpty());
}
 
void ClearComboBox::handleClearButtonClicked()
{
    clearEditText();
}
 
void ClearComboBox::handleCustomLayoutCreated()
{
    const QStyle *const s = style();
    QStyleOptionComboBox opt;
    opt.initFrom(this);
    setContentsMarginsFromEditFieldRectAndFrameWidth(
        s->subControlRect(QStyle::CC_ComboBox, &opt, QStyle::SC_ComboBoxEditField, this), s->pixelMetric(QStyle::PM_ComboBoxFrameWidth, &opt, this));
    connect(this, &ClearComboBox::currentTextChanged, this, &ClearComboBox::handleTextChanged);
}
 
bool ClearComboBox::isCleared() const
{
    return currentText().isEmpty();
}
} // namespace QtUtilities