feat: add an own lock screen with the bubble and your wallpaper

src/agent/lockscreencontroller.h

@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+// The own lock screen's side of things (see SessionLock): the password,
+// whether it is being checked, what to say under it.
+//
+// The password is checked with PAM in a thread of its own, the way swaylock
+// and hyprlock do it. The service is face-unlock-lock when an administrator
+// has written one, else the distribution's plain password stack:
+// password-auth (Fedora), common-auth (Debian, Ubuntu) or login. Not the face
+// module: the face has its own way in here, the agent.
+
+#pragma once
+
+#include <QObject>
+#include <QString>
+
+class LockScreenController : public QObject
+{
+    Q_OBJECT
+    Q_PROPERTY(QString password READ password WRITE setPassword NOTIFY passwordChanged)
+    Q_PROPERTY(bool busy READ busy NOTIFY busyChanged)
+    // After a wrong password, until the next key.
+    Q_PROPERTY(QString message READ message NOTIFY messageChanged)
+    // Whether the face is looked for, which changes what the screen says.
+    Q_PROPERTY(bool faceUnlock READ faceUnlock NOTIFY faceUnlockChanged)
+    Q_PROPERTY(QString userName READ userName CONSTANT)
+    // Whether to blur the picture behind it.
+    Q_PROPERTY(bool blur READ blur NOTIFY blurChanged)
+public:
+    explicit LockScreenController(QObject *parent = nullptr);
+    ~LockScreenController() override;
+
+    QString password() const
+    {
+        return m_password;
+    }
+    void setPassword(const QString &password);
+    bool busy() const
+    {
+        return m_busy;
+    }
+    QString message() const
+    {
+        return m_message;
+    }
+    bool faceUnlock() const
+    {
+        return m_faceUnlock;
+    }
+    void setFaceUnlock(bool on);
+    QString userName() const;
+    bool blur() const
+    {
+        return m_blur;
+    }
+    void setBlur(bool blur);
+
+    // Check the password typed so far.
+    Q_INVOKABLE void submit();
+    // A key or the pointer on the lock screen.
+    Q_INVOKABLE void activity();
+
+    // A fresh lock: no password, nothing said.
+    void reset();
+
+Q_SIGNALS:
+    void passwordChanged();
+    void busyChanged();
+    void messageChanged();
+    void faceUnlockChanged();
+    void blurChanged();
+    void authenticated();
+    // A wrong password, for the field to shake.
+    void rejected();
+    void input();
+
+private:
+    void finish(bool ok);
+    void clearPassword();
+
+    QString m_password;
+    QString m_message;
+    bool m_busy = false;
+    bool m_faceUnlock = true;
+    bool m_blur = false;
+};