[irc] Partially fix IRC colors (#1594)

Doesn't fix #1379 but it is a big step forward.

Needs some "real life" testing, but should be good.

src/messages/layouts/MessageLayoutElement.cpp

@@ -395,4 +395,41 @@ int TextIconLayoutElement::getXFromIndex(int index)
     }
 }
 
+//
+// TEXT
+//
+
+MultiColorTextLayoutElement::MultiColorTextLayoutElement(
+    MessageElement &_creator, QString &_text, const QSize &_size,
+    std::vector<PajSegment> segments, FontStyle _style, float _scale)
+    : TextLayoutElement(_creator, _text, _size, QColor{}, _style, _scale)
+    , segments_(segments)
+{
+    this->setText(_text);
+}
+
+void MultiColorTextLayoutElement::paint(QPainter &painter)
+{
+    auto app = getApp();
+
+    painter.setPen(this->color_);
+
+    painter.setFont(app->fonts->getFont(this->style_, this->scale_));
+
+    int xOffset = 0;
+
+    auto metrics = app->fonts->getFontMetrics(this->style_, this->scale_);
+
+    for (const auto &segment : this->segments_)
+    {
+        // qDebug() << "Draw segment:" << segment.text;
+        painter.setPen(segment.color);
+        painter.drawText(QRectF(this->getRect().x() + xOffset,
+                                this->getRect().y(), 10000, 10000),
+                         segment.text,
+                         QTextOption(Qt::AlignLeft | Qt::AlignTop));
+        xOffset += metrics.width(segment.text);
+    }
+}
+
 }  // namespace chatterino

src/messages/layouts/MessageLayoutElement.hpp

@@ -107,7 +107,6 @@ protected:
     int getMouseOverIndex(const QPoint &abs) const override;
     int getXFromIndex(int index) override;
 
-private:
     QColor color_;
     FontStyle style_;
     float scale_;
@@ -138,4 +137,25 @@ private:
     QString line2;
 };
 
+struct PajSegment {
+    QString text;
+    QColor color;
+};
+
+// TEXT
+class MultiColorTextLayoutElement : public TextLayoutElement
+{
+public:
+    MultiColorTextLayoutElement(MessageElement &creator_, QString &text,
+                                const QSize &size,
+                                std::vector<PajSegment> segments,
+                                FontStyle style_, float scale_);
+
+protected:
+    void paint(QPainter &painter) override;
+
+private:
+    std::vector<PajSegment> segments_;
+};
+
 }  // namespace chatterino