line_edit_completer.h

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#ifndef LINEEDITCOMPLETER_H
#define LINEEDITCOMPLETER_H
 
#include "custom_line_edit.h"
 
#include <QCompleter>
#include <QFocusEvent>
#include <QKeyEvent>
#include <QList>
#include <QString>
#include <QVector>
 
enum class CompleterTrigger
{
    Mention, //< "@" prefix, replaced in place with a trailing space.
    Card     //< "[[" prefix, replaced with the completion plus a closing "]] ".
};
 
struct CompleterInfo
{
    QCompleter *completer;
    CompleterTrigger trigger;
};
 
class LineEditCompleter : public LineEditUnfocusable
{
    Q_OBJECT
signals:
    void cardPartialChanged(const QString &partial);
 
private:
    QList<CompleterInfo> completers;
 
    void insertCompletion(QCompleter *completer, const QString &completion);
 
private slots:
    void insertCompletion(const QString &text);
 
protected:
    void keyPressEvent(QKeyEvent *event) override;
    void focusOutEvent(QFocusEvent *e) override;
 
public:
    explicit LineEditCompleter(QWidget *parent = nullptr);
    void addCompleter(QCompleter *c, CompleterTrigger trigger);
 
    bool hasVisibleCompleterPopup() const;
    void hideCompleterPopups();
};
 
#endif