Add style colors for the ScrollBar

include/ui/ScrollBar.h

@@ -26,12 +26,21 @@
 class ScrollBar : public QScrollBar
 {
         Q_OBJECT
+        Q_PROPERTY(QColor backgroundColor READ backgroundColor WRITE setBackgroundColor)
+        Q_PROPERTY(QColor handleColor READ handleColor WRITE setHandleColor)
+
 public:
         ScrollBar(QScrollArea *area, QWidget *parent = nullptr);
 
         void fadeIn();
         void fadeOut();
 
+        QColor backgroundColor() const { return bgColor_; }
+        void setBackgroundColor(QColor &color) { bgColor_ = color; }
+
+        QColor handleColor() const { return handleColor_; }
+        void setHandleColor(QColor &color) { handleColor_ = color; }
+
 protected:
         void paintEvent(QPaintEvent *e) override;
         void sliderChange(SliderChange change) override;
@@ -50,4 +59,7 @@ private:
 
         QScrollArea *area_;
         QRect handle_;
+
+        QColor bgColor_     = QColor(33, 33, 33, 30);
+        QColor handleColor_ = QColor(0, 0, 0, 80);
 };

resources/styles/nheko-dark.qss

@@ -117,3 +117,8 @@ QTextEdit {
     background-color: #383c4a;
     color: #caccd1;
 }
+
+ScrollBar {
+    qproperty-handleColor: #caccd1;
+    qproperty-backgroundColor: #383c4e;
+}

resources/styles/nheko.qss

@@ -108,3 +108,8 @@ FloatingButton {
     qproperty-backgroundColor: #efefef;
     qproperty-foregroundColor: black;
 }
+
+ScrollBar {
+    qproperty-handleColor: #ccc;
+    qproperty-backgroundColor: #efefef;
+}

resources/styles/system.qss

@@ -84,3 +84,8 @@ QTextEdit,
 QLineEdit {
     background-color: palette(window);
 }
+
+ScrollBar {
+    qproperty-handleColor: palette(text);
+    qproperty-backgroundColor: palette(window);
+}

src/ui/ScrollBar.cc

@@ -85,10 +85,7 @@ ScrollBar::paintEvent(QPaintEvent *)
 
         p.setPen(Qt::NoPen);
 
-        QColor bg(33, 33, 33, 30);
-        QColor handle(0, 0, 0, 80);
-
-        p.setBrush(bg);
+        p.setBrush(backgroundColor());
         QRect backgroundArea(Padding, 0, handleWidth_, height());
         p.drawRoundedRect(backgroundArea, roundRadius_, roundRadius_);
 
@@ -104,7 +101,7 @@ ScrollBar::paintEvent(QPaintEvent *)
 
         int handle_y = (value() * (areaHeight - handleHeight - roundRadius_ / 2)) / maximum();
 
-        p.setBrush(handle);
+        p.setBrush(handleColor());
         QRect handleArea(Padding, handle_y, handleWidth_, handleHeight);
         p.drawRoundedRect(handleArea, roundRadius_, roundRadius_);
 }