CommandLineEdit.h

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#pragma once
#include <NDEVR/QCustomLineEdit.h>
#include <QCompleter>
#include <QKeyEvent>
namespace NDEVR
{
    class CommandLineEdit : public QCustomLineEdit
    {
        CommandLineEdit(QWidget* parent = nullptr)
            : QCustomLineEdit(parent)
            , m_scroll_back_index(Constant<uint04>::NaN)
        {
 
        }
        void setCompleter(QCompleter* completer)
        {
            if (c)
                c->disconnect(this);
 
            c = completer;
 
            if (!c)
                return;
 
            c->setWidget(this);
            c->setCompletionMode(QCompleter::PopupCompletion);
            c->setCaseSensitivity(Qt::CaseInsensitive);
            QObject::connect(c, QOverload<const QString&>::of(&QCompleter::activated),
                this, &CommandLineEdit::insertCompletion);
        }
    protected:
        void keyPressEvent(QKeyEvent* e) override
        {
            switch (e->key()) {
            case Qt::Key_Enter:
            case Qt::Key_Return:
            case Qt::Key_Escape:
            case Qt::Key_Tab:
            case Qt::Key_Backtab:
                e->ignore();
                return; // let the completer do default behavior
            default:
                break;
            }
        }
    
        void focusInEvent(QFocusEvent* e) override
        {
            if (c)
                c->setWidget(this);
            QCustomLineEdit::focusInEvent(e);
        }
 
    private slots:
        void insertCompletion(const QString& completion)
        {
            if (c->widget() != this)
                return;
 
        }
    private:
        QString textUnderCursor() const;
 
    private:
        QCompleter* c = nullptr;
        Buffer<String> m_last_commands;
        uint04 m_scroll_back_index;
    };
}