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#include "filter-combo-box.hpp"
#include "ui-helpers.hpp"
#include <QCompleter>
#include <QLineEdit>
#include <QFocusEvent>
namespace advss {
bool FilterComboBox::_filteringEnabled = false;
FilterComboBox::FilterComboBox(QWidget *parent, const QString &placehodler)
: QComboBox(parent)
{
// If the filtering behaviour of the FilterComboBox is disabled it is
// just a regular QComboBox with the option to set a placeholder so exit
// the constructor early.
if (!_filteringEnabled) {
if (!placehodler.isEmpty()) {
setPlaceholderText(placehodler);
}
return;
}
// Allow edit for completer but don't add new entries on pressing enter
setEditable(true);
setInsertPolicy(InsertPolicy::NoInsert);
if (!placehodler.isEmpty()) {
lineEdit()->setPlaceholderText(placehodler);
// Make sure that the placeholder text is visible
QFontMetrics fontMetrics(font());
int textWidth = fontMetrics.boundingRect(placehodler).width();
QStyleOptionComboBox comboBoxOption;
comboBoxOption.initFrom(this);
int buttonWidth =
style()->subControlRect(QStyle::CC_ComboBox,
&comboBoxOption,
QStyle::SC_ComboBoxArrow, this)
.width();
setMinimumWidth(buttonWidth + textWidth);
}
setMaxVisibleItems(30);
auto c = completer();
c->setCaseSensitivity(Qt::CaseInsensitive);
c->setFilterMode(Qt::MatchContains);
c->setCompletionMode(QCompleter::PopupCompletion);
connect(c, QOverload<const QModelIndex &>::of(&QCompleter::highlighted),
this, &FilterComboBox::CompleterHighlightChanged);
connect(lineEdit(), &QLineEdit::textChanged, this,
&FilterComboBox::TextChanged);
}
void FilterComboBox::SetFilterBehaviourEnabled(bool value)
{
FilterComboBox::_filteringEnabled = value;
}
void FilterComboBox::SetAllowUnmatchedSelection(bool allow)
{
_allowUnmatchedSelection = allow;
}
void FilterComboBox::setCurrentText(const QString &text)
{
if (_filteringEnabled) {
lineEdit()->setText(text);
}
QComboBox::setCurrentText(text);
}
void FilterComboBox::setItemText(int index, const QString &text)
{
QComboBox::setItemText(index, text);
if (_filteringEnabled && index == currentIndex()) {
const QSignalBlocker b(this);
lineEdit()->setText(text);
}
}
QSize FilterComboBox::sizeHint() const
{
QSize size = QComboBox::sizeHint();
if (!_filteringEnabled) {
return QComboBox::sizeHint();
}
QFontMetrics fm(font());
int extra = fm.horizontalAdvance("X") * 2; // Add padding
size.setWidth(size.width() + extra);
return size;
}
void FilterComboBox::focusOutEvent(QFocusEvent *event)
{
// Reset on invalid selection
if (!_allowUnmatchedSelection && findText(currentText()) == -1) {
setCurrentIndex(-1);
Emit(-1, "");
}
QComboBox::focusOutEvent(event);
_lastCompleterHighlightRow = -1;
}
static int findXthOccurrence(QComboBox *list, int count, const QString &value)
{
if (value.isEmpty() || count < 1) {
return -1;
}
const auto size = list->count();
int idx = FindIdxInRagne(list, 0, size, value.toStdString(),
Qt::MatchContains | Qt::MatchFixedString);
if (count == 1) {
return idx;
}
for (int i = 1; i < count; i++) {
idx = FindIdxInRagne(list, idx, size, value.toStdString(),
Qt::MatchContains | Qt::MatchFixedString);
}
return idx;
}
void FilterComboBox::CompleterHighlightChanged(const QModelIndex &index)
{
_lastCompleterHighlightRow = index.row();
const auto text = currentText();
int idx = findXthOccurrence(this, _lastCompleterHighlightRow, text);
if (idx == -1) {
return;
}
Emit(idx, text);
}
void FilterComboBox::TextChanged(const QString &text)
{
auto c = completer();
const bool completerActive = c->completionCount() > 0;
int count = completerActive ? _lastCompleterHighlightRow + 1 : 1;
int idx = findXthOccurrence(this, count, text);
if (idx == -1) {
return;
}
}
void FilterComboBox::Emit(int index, const QString &text)
{
if (_lastEmittedIndex != index) {
_lastEmittedIndex = index;
emit currentIndexChanged(index);
}
if (_lastEmittedText != text) {
_lastEmittedText = text;
emit currentTextChanged(text);
}
}
} // namespace advss
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