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#include "./clearcombobox.h"
#include <QHBoxLayout>
#include <QStyle>
#include <QStyleOptionComboBox>
namespace QtUtilities {
/*!
* \class ClearComboBox
* \brief A QComboBox with an embedded button for clearing its contents.
*/
/// \cond
static inline auto *getComboBoxLineEdit(QComboBox *comboBox)
{
comboBox->setEditable(true);
return comboBox->lineEdit();
}
/// \endcond
/*!
* \brief Constructs a clear combo box.
* \remarks The combo box is initialized to be editable and which must not be changed.
*/
ClearComboBox::ClearComboBox(QWidget *parent)
: QComboBox(parent)
, ButtonOverlay(this, getComboBoxLineEdit(this))
{
ButtonOverlay::setClearButtonEnabled(true);
}
/*!
* \brief Destroys the clear combo box.
*/
ClearComboBox::~ClearComboBox()
{
}
/*!
* \brief Updates the visibility of the clear button.
*/
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
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