ComboTabBar: Add possibility to change base color from stylesheets

src/lib/app/proxystyle.cpp

@@ -1,6 +1,6 @@
 /* ============================================================
 * Falkon - Qt web browser
-* Copyright (C) 2010-2014  David Rosca <nowrep@gmail.com>
+* Copyright (C) 2010-2018 David Rosca <nowrep@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
@@ -16,6 +16,10 @@
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * ============================================================ */
 #include "proxystyle.h"
+#include "combotabbar.h"
+
+#include <QPainter>
+#include <QStyleOption>
 
 ProxyStyle::ProxyStyle()
     : QProxyStyle()
@@ -56,6 +60,20 @@ int ProxyStyle::pixelMetric(PixelMetric metric, const QStyleOption* option, cons
     }
 }
 
+void ProxyStyle::drawPrimitive(PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget) const
+{
+    if (element == PE_FrameTabBarBase) {
+        TabBarHelper *tabBar = qobject_cast<TabBarHelper*>(option->styleObject);
+        if (tabBar && tabBar->baseColor().isValid()) {
+            painter->setPen(QPen(tabBar->baseColor(), 0));
+            painter->drawLine(option->rect.topLeft(), option->rect.topRight());
+            return;
+        }
+    }
+
+    QProxyStyle::drawPrimitive(element, option, painter, widget);
+}
+
 QString ProxyStyle::name() const
 {
     return baseStyle()->objectName();

src/lib/app/proxystyle.h

@@ -1,6 +1,6 @@
 /* ============================================================
 * Falkon - Qt web browser
-* Copyright (C) 2010-2014  David Rosca <nowrep@gmail.com>
+* Copyright (C) 2010-2018 David Rosca <nowrep@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
@@ -29,6 +29,7 @@ public:
 
     int styleHint(StyleHint hint, const QStyleOption* option = 0, const QWidget* widget = 0, QStyleHintReturn* returnData = 0) const;
     int pixelMetric(PixelMetric metric, const QStyleOption* option, const QWidget* widget) const;
+    void drawPrimitive(PrimitiveElement element, const QStyleOption *option, QPainter *painter, const QWidget *widget = nullptr) const override;
 
     QString name() const;
 

src/lib/tabwidget/combotabbar.cpp

@@ -1015,6 +1015,16 @@ void TabBarHelper::setTabPadding(int padding)
     m_tabPadding = padding;
 }
 
+QColor TabBarHelper::baseColor() const
+{
+    return m_baseColor;
+}
+
+void TabBarHelper::setBaseColor(const QColor &color)
+{
+    m_baseColor = color;
+}
+
 void TabBarHelper::setTabButton(int index, QTabBar::ButtonPosition position, QWidget* widget)
 {
     QTabBar::setTabButton(index, position, widget);

src/lib/tabwidget/combotabbar.h

@@ -229,6 +229,7 @@ class FALKON_EXPORT TabBarHelper : public QTabBar
 {
     Q_OBJECT
     Q_PROPERTY(int tabPadding READ tabPadding WRITE setTabPadding)
+    Q_PROPERTY(QColor baseColor READ baseColor WRITE setBaseColor)
 
 public:
     explicit TabBarHelper(bool isPinnedTabBar, ComboTabBar* comboTabBar);
@@ -236,6 +237,9 @@ public:
     int tabPadding() const;
     void setTabPadding(int padding);
 
+    QColor baseColor() const;
+    void setBaseColor(const QColor &color);
+
     void setTabButton(int index, QTabBar::ButtonPosition position, QWidget* widget);
 
     QSize tabSizeHint(int index) const;
@@ -277,6 +281,7 @@ private:
     QScrollArea* m_scrollArea;
 
     int m_tabPadding = -1;
+    QColor m_baseColor;
     int m_pressedIndex;
     bool m_dragInProgress;
     QPoint m_dragStartPosition;