Add api to enable and disable sidebar tabs

src/plugins/coreplugin/fancytabwidget.cpp

@@ -205,6 +205,7 @@ void FancyTabBar::paintTab(QPainter *painter, int tabIndex) const
 
     bool selected = (tabIndex == m_currentIndex);
     bool hover = (tabIndex == m_hoverIndex);
+    bool enabled = isTabEnabled(tabIndex);
 
 #ifdef Q_WS_MAC
     hover = false; // Do not hover on Mac
@@ -233,7 +234,7 @@ void FancyTabBar::paintTab(QPainter *painter, int tabIndex) const
         painter->drawLine(rect.bottomLeft(), rect.bottomRight());
     } else {
         painter->fillRect(rect, background);
-        if (hover)
+        if (hover && enabled)
             painter->fillRect(rect, hoverColor);
         painter->setPen(QPen(light, 0));
         painter->drawLine(rect.topLeft(), rect.topRight());
@@ -250,24 +251,54 @@ void FancyTabBar::paintTab(QPainter *painter, int tabIndex) const
     painter->setFont(boldFont);
     painter->setPen(selected ? Utils::StyleHelper::panelTextColor() : QColor(30, 30, 30, 80));
     int textFlags = Qt::AlignCenter | Qt::AlignBottom | Qt::ElideRight | Qt::TextWordWrap;
+    if (enabled) {
         painter->drawText(tabTextRect, textFlags, tabText);
         painter->setPen(selected ? QColor(60, 60, 60) : Utils::StyleHelper::panelTextColor());
+    } else {
+        painter->setPen(selected ? Utils::StyleHelper::panelTextColor() : QColor(255, 255, 255, 120));
+    }
+
     int textHeight = painter->fontMetrics().boundingRect(QRect(0, 0, width(), height()), Qt::TextWordWrap, tabText).height();
     tabIconRect.adjust(0, 4, 0, -textHeight);
     int iconSize = qMin(tabIconRect.width(), tabIconRect.height());
     if (iconSize > 4)
         style()->drawItemPixmap(painter, tabIconRect, Qt::AlignCenter | Qt::AlignVCenter,
-                                tabIcon(tabIndex).pixmap(tabIconRect.size()));
+                                tabIcon(tabIndex).pixmap(tabIconRect.size(), enabled ? QIcon::Normal : QIcon::Disabled));
     painter->translate(0, -1);
     painter->drawText(tabTextRect, textFlags, tabText);
     painter->restore();
 }
 
 void FancyTabBar::setCurrentIndex(int index) {
+    if (isTabEnabled(index)) {
         m_currentIndex = index;
         update();
         emit currentChanged(index);
     }
+}
+
+void FancyTabBar::setTabEnabled(int index, bool enable)
+{
+    Q_ASSERT(index < m_tabs.size());
+    Q_ASSERT(index >= 0);
+
+    if (index < m_tabs.size() && index >= 0) {
+        m_tabs[index].enabled = enable;
+        update(tabRect(index));
+    }
+}
+
+bool FancyTabBar::isTabEnabled(int index) const
+{
+    Q_ASSERT(index < m_tabs.size());
+    Q_ASSERT(index >= 0);
+
+    if (index < m_tabs.size() && index >= 0)
+        return m_tabs[index].enabled;
+
+    return false;
+}
+
 
 //////
 // FancyColorButton
@@ -410,6 +441,7 @@ QStatusBar *FancyTabWidget::statusBar() const
 
 void FancyTabWidget::setCurrentIndex(int index)
 {
+    if (m_tabBar->isTabEnabled(index))
         m_tabBar->setCurrentIndex(index);
 }
 
@@ -424,3 +456,13 @@ void FancyTabWidget::setTabToolTip(int index, const QString &toolTip)
 {
     m_tabBar->setTabToolTip(index, toolTip);
 }
+
+void FancyTabWidget::setTabEnabled(int index, bool enable)
+{
+    m_tabBar->setTabEnabled(index, enable);
+}
+
+bool FancyTabWidget::isTabEnabled(int index) const
+{
+    return m_tabBar->isTabEnabled(index);
+}

src/plugins/coreplugin/fancytabwidget.h

@@ -48,6 +48,7 @@ namespace Internal {
         QIcon icon;
         QString text;
         QString toolTip;
+        bool enabled;
     };
 
 class FancyTabBar : public QWidget
@@ -70,8 +71,12 @@ public:
     QSize sizeHint() const;
     QSize minimumSizeHint() const;
 
+    void setTabEnabled(int index, bool enable);
+    bool isTabEnabled(int index) const;
+
     void insertTab(int index, const QIcon &icon, const QString &label) {
         FancyTab tab;
+        tab.enabled = true;
         tab.icon = icon;
         tab.text = label;
         m_tabs.insert(index, tab);
@@ -130,6 +135,9 @@ public:
     int currentIndex() const;
     QStatusBar *statusBar() const;
 
+    void setTabEnabled(int index, bool enable);
+    bool isTabEnabled(int index) const;
+
 signals:
     void currentAboutToShow(int index);
     void currentChanged(int index);