Provide a colour code for the user

Contributes to #296
quotient-im · May 11, 2019 · cebca19 · cebca19
1 parent b467b08
commit cebca19
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diff --git a/lib/user.cpp b/lib/user.cpp
@@ -33,6 +33,9 @@
 #include <QtCore/QStringBuilder>
 #include <QtCore/QElapsedTimer>
 
+#include <QtCore/QCryptographicHash>
+#include <QtCore/QtEndian>
+
 #include <functional>
 
 using namespace QMatrixClient;
@@ -424,3 +427,15 @@ void User::processEvent(const RoomMemberEvent& event, const Room* room)
         updateAvatarUrl(event.avatarUrl(), d->avatarUrlForRoom(room), room);
     }
 }
+
+qreal User::hueF() const
+{
+    QByteArray hash = QCryptographicHash::hash(d->userId.toUtf8(),
+                                               QCryptographicHash::Sha1);
+    QDataStream dataStream(qToLittleEndian(hash).left(1));
+    dataStream.setByteOrder(QDataStream::LittleEndian);
+    quint8 hashValue;
+    dataStream >> hashValue;
+    qreal hueF = static_cast<qreal>(hashValue)/std::numeric_limits<quint8>::max()*std::numeric_limits<qreal>::max();
+    return hueF;
+}
diff --git a/lib/user.h b/lib/user.h
@@ -33,6 +33,7 @@ namespace QMatrixClient
             Q_OBJECT
             Q_PROPERTY(QString id READ id CONSTANT)
             Q_PROPERTY(bool isGuest READ isGuest CONSTANT)
+            Q_PROPERTY(qreal hueF READ hueF CONSTANT)
             Q_PROPERTY(QString name READ name NOTIFY nameChanged)
             Q_PROPERTY(QString displayName READ displayname NOTIFY nameChanged STORED false)
             Q_PROPERTY(QString fullName READ fullName NOTIFY nameChanged STORED false)
@@ -95,6 +96,10 @@ namespace QMatrixClient
              */
             bool isGuest() const;
 
+            /** Hue color component of this user based on id.
+             */
+            qreal hueF() const;
+
             const Avatar& avatarObject(const Room* room = nullptr) const;
             Q_INVOKABLE QImage avatar(int dimension, const Room* room = nullptr);
             Q_INVOKABLE QImage avatar(int requestedWidth, int requestedHeight,