diff --git a/src/kcapacitybar.h b/src/kcapacitybar.h
--- a/src/kcapacitybar.h
+++ b/src/kcapacitybar.h
@@ -64,6 +64,12 @@
     };
     Q_ENUM(DrawTextMode)
 
+    enum State {
+        Neutral = 0,     /// Allow the capacity bar to reflect a neutral state (default)
+        Positive,        /// Allow the capacity bar to reflect a positive state, for instance filling in green
+        Negative         /// Allow the capacity bar to reflect a negative state, for instance filling in red
+    };
+    Q_ENUM(State)
 
     /**
      * Constructs a capacity bar with DrawTextOutline as draw text mode.
@@ -110,6 +116,18 @@
       */
     QString text() const;
 
+    /**
+      * Allow to change the state of the KCapacityBar
+      * @see KCapacityBar::State
+      */
+    void setState(KCapacityBar::State newState);
+
+    /**
+     * Returns the state of the KCapacityBar
+     * @see KCapacityBar::State
+     */
+    KCapacityBar::State state() const;
+
     /**
       * When the capacity bar is non-continuous, sets whether the last block
       * shown should be drawn full or can be cut off (depending on the capacity
diff --git a/src/kcapacitybar.cpp b/src/kcapacitybar.cpp
--- a/src/kcapacitybar.cpp
+++ b/src/kcapacitybar.cpp
@@ -47,7 +47,8 @@
         , barHeight(12)
         , horizontalTextAlignment(Qt::AlignCenter)
         , ce_capacityBar(QStyle::ControlElement(0))
-        , drawTextMode(drawTextMode) {}
+        , drawTextMode(drawTextMode)
+        , state(State::Neutral) {}
 
     ~Private() {}
 
@@ -60,6 +61,7 @@
     QStyle::ControlElement ce_capacityBar;
 
     KCapacityBar::DrawTextMode drawTextMode;
+    State state;
 };
 
 KCapacityBar::KCapacityBar(QWidget *parent)
@@ -110,6 +112,17 @@
     return d->text;
 }
 
+void KCapacityBar::setState(KCapacityBar::State newState)
+{
+    d->state = newState;
+    update();
+}
+
+KCapacityBar::State KCapacityBar::state() const
+{
+    return d->state;
+}
+
 void KCapacityBar::setFillFullBlocks(bool fillFullBlocks)
 {
     d->fillFullBlocks = fillFullBlocks;
@@ -265,8 +278,20 @@
     internalBar.quadTo(left - roundMargin / 2, drawRect.height() / 2, left + roundMargin / 4, 0);
 
     QLinearGradient fillInternalBar(left, 0, right, 0);
+    QColor fillInternalBarColor;
+    switch (d->state) {
+        case Neutral:
+        fillInternalBarColor = palette().window().color();
+        break;
+        case Positive:
+        fillInternalBarColor = Qt::green;
+        break;
+        case Negative:
+        fillInternalBarColor = Qt::red;
+        break;
+    }
     fillInternalBar.setColorAt(0, palette().window().color().darker(MidShade));
-    fillInternalBar.setColorAt(0.5, palette().window().color().darker(LightShade));
+    fillInternalBar.setColorAt(0.5, fillInternalBarColor.light(LightShade));
     fillInternalBar.setColorAt(1, palette().window().color().darker(MidShade));
 
     if (d->drawTextMode == KCapacityBar::DrawTextInline) {
@@ -322,16 +347,16 @@
     p->save();
     p->setClipping(false);
     QRadialGradient topGradient(QPointF(rect.width() / 2, drawRect.top()), rect.width() / 2);
-    const QColor fillTopColor = palette().window().color().darker(LightShade);
+    QColor fillTopColor = palette().window().color().darker(LightShade);
     topGradient.setColorAt(0, QColor(fillTopColor.red(), fillTopColor.green(), fillTopColor.blue(), 127));
     topGradient.setColorAt(1, Qt::transparent);
     p->fillRect(QRect(rect.left(), rect.top() + drawRect.top(), rect.width(), 2), topGradient);
     p->restore();
 
     p->save();
     p->setClipRect(QRect(-1, 0, rect.width(), drawRect.height() / 2), Qt::ReplaceClip);
     QLinearGradient glassGradient(0, -5, 0, drawRect.height());
-    const QColor fillGlassColor = palette().base().color();
+    QColor fillGlassColor= palette().base().color();
     glassGradient.setColorAt(0, QColor(fillGlassColor.red(), fillGlassColor.green(), fillGlassColor.blue(), 255));
     glassGradient.setColorAt(1, Qt::transparent);
     p->fillPath(internalBar, glassGradient);
diff --git a/src/kmessagewidget.cpp b/src/kmessagewidget.cpp
--- a/src/kmessagewidget.cpp
+++ b/src/kmessagewidget.cpp
@@ -315,7 +315,7 @@
     ensurePolished();
     return QFrame::heightForWidth(width);
 }
-#include <QDebug>
+
 void KMessageWidget::paintEvent(QPaintEvent *event)
 {
     Q_UNUSED(event)