Animation for tab close buttons

Also, restored dark KvFlat themes.
Also, polished KvBeige and KvBrown.

Kvantum/ChangeLog

@@ -28,6 +28,7 @@ V0.10.9
  * Show menus of menubar items exactly below them, without a gap.
  * Removed text shadow depths > 1 until Qt supports a better way of adding text shadows with QPainter.
  * Added a workaround for Qt scroll jump with mouse gestures (as a hacking option in Kvantum Manager).
+ * Animation for tab close buttons.
 
 V0.10.8
 ---------

Kvantum/NEWS

@@ -1,5 +1,5 @@
 Latest version:
 
-	13 Nov 2018, V0.10.9
+	14 Nov 2018, V0.10.9
 
 See "ChangeLog" for changes.

Kvantum/style/Kvantum.cpp

@@ -4469,31 +4469,24 @@ void Style::drawPrimitive(PrimitiveElement element,
       default_frame_spec(fspec);
       const indicator_spec dspec = getIndicatorSpec("Tab");
 
+      bool pseudoState(false);
       QString status;
       if (!(option->state & State_Enabled))
         status = "disabled";
       else if ((option->state & State_Selected) && hasActiveIndicator_)
       {
         if (option->state & State_Sunken)
         {
-          if (renderIndicator(painter, option->rect, fspec, dspec,
-                              dspec.element+"-close-toggledPressed",
-                              option->direction))
-          {
-            break;
-          }
+          pseudoState = true;
+          status = "toggledPressed";
         }
         else if (option->state & State_MouseOver)
         {
-          if (renderIndicator(painter, option->rect, fspec, dspec,
-                              dspec.element+"-close-toggledFocused" + (isWidgetInactive(widget)
-                                                                       ? "-inactive" : QString()),
-                              option->direction))
-          {
-            break;
-          }
+          pseudoState = true;
+          status = "toggledFocused";
         }
-        status = "toggled";
+        else
+          status = "toggled";
       }
       else
       {
@@ -4502,7 +4495,57 @@ void Style::drawPrimitive(PrimitiveElement element,
       }
       if (isWidgetInactive(widget))
         status.append("-inactive");
-      renderIndicator(painter,option->rect,fspec,dspec,dspec.element+"-close-"+status,option->direction);
+
+      QObject *styleObject = option->styleObject;
+      QString animationStartState;
+      if (styleObject)
+        animationStartState = styleObject->property("_kv_state").toString();
+      bool animate(widget && widget->isEnabled() && animatedWidget_ == widget
+                   && !animationStartState.isEmpty()
+                   && qobject_cast<const QAbstractButton*>(widget));
+      if (animate && animationStartState == status)
+      {
+        if (opacityTimer_->isActive())
+          opacityTimer_->stop();
+        animationOpacity_ = 0;
+        animate = false;
+      }
+
+      if (animate)
+      {
+        if (!opacityTimer_->isActive())
+        {
+          animationOpacity_ = 0;
+          opacityTimer_->start(ANIMATION_FRAME);
+        }
+        if (animationOpacity_ < 100)
+        {
+          renderIndicator(painter,option->rect,fspec,dspec,
+                                  dspec.element+"-close-"+animationStartState,option->direction);
+        }
+        painter->save();
+        painter->setOpacity(static_cast<qreal>(animationOpacity_)/100.0);
+      }
+
+      if (pseudoState)
+      {
+        if(!renderIndicator(painter,option->rect,fspec,dspec,dspec.element+"-close-"+status,option->direction))
+        { // the "toggledX" pseudo-state doesn't exist
+          status = "toggled" + (isWidgetInactive(widget) ? "-inactive" : QString());
+          renderIndicator(painter,option->rect,fspec,dspec,dspec.element+"-close-"+status,option->direction);
+        }
+      }
+      else
+        renderIndicator(painter,option->rect,fspec,dspec,dspec.element+"-close-"+status,option->direction);
+
+      if (animate)
+      {
+          painter->restore();
+          if (animationOpacity_ >= 100)
+            styleObject->setProperty("_kv_state", status);
+      }
+      else if (styleObject)
+          styleObject->setProperty("_kv_state", status);
 
       break;
     }

Kvantum/style/polishing.cpp

@@ -621,6 +621,7 @@ void Style::polish(QWidget *widget)
                  && !qobject_cast<QLineEdit*>(pw)) // exclude line-edit clear buttons
              || qobject_cast<QCheckBox*>(widget)
              || qobject_cast<QRadioButton*>(widget)
+             || (qobject_cast<QAbstractButton*>(widget) && qobject_cast<QTabBar*>(pw)) // tab close button
              || widget->inherits("QComboBoxPrivateContainer")))
             /* unfortunately, KisSliderSpinBox uses a null widget in drawing
                its progressbar, so we can identify it only through eventFilter()
@@ -1135,6 +1136,7 @@ void Style::unpolish(QWidget *widget)
             (qobject_cast<QPushButton*>(widget)
              || qobject_cast<QCheckBox*>(widget)
              || qobject_cast<QRadioButton*>(widget)
+             || (qobject_cast<QAbstractButton*>(widget) && qobject_cast<QTabBar*>(widget->parentWidget()))
              || qobject_cast<QScrollBar*>(widget)
              || qobject_cast<QSlider*>(widget)
              || qobject_cast<QLineEdit*>(widget)

Kvantum/themes/colors/KvFlat.colors

@@ -0,0 +1,105 @@
+[ColorEffects:Disabled]
+Color=112,111,110
+ColorAmount=0
+ColorEffect=0
+ContrastAmount=0.65
+ContrastEffect=1
+IntensityAmount=0.1
+IntensityEffect=0
+
+[ColorEffects:Inactive]
+ChangeSelectionColor=true
+Color=112,111,110
+ColorAmount=0.025
+ColorEffect=2
+ContrastAmount=0.1
+ContrastEffect=2
+Enable=true
+IntensityAmount=0
+IntensityEffect=0
+
+[Colors:Button]
+BackgroundAlternate=74,74,74
+BackgroundNormal=85,85,85
+DecorationFocus=170,170,170
+DecorationHover=150,150,150
+ForegroundActive=255,128,224
+ForegroundInactive=160,160,160
+ForegroundLink=46,184,230
+ForegroundNegative=240,1,1
+ForegroundNeutral=255,221,0
+ForegroundNormal=255,255,255
+ForegroundPositive=128,255,128
+ForegroundVisited=255,102,102
+
+[Colors:Selection]
+BackgroundAlternate=63,103,165
+BackgroundNormal=63,103,165
+DecorationFocus=170,170,170
+DecorationHover=150,150,150
+ForegroundActive=255,128,224
+ForegroundInactive=160,160,160
+ForegroundLink=46,184,230
+ForegroundNegative=240,1,1
+ForegroundNeutral=255,221,0
+ForegroundNormal=255,255,255
+ForegroundPositive=128,255,128
+ForegroundVisited=255,102,102
+
+[Colors:Tooltip]
+BackgroundAlternate=0,0,0
+BackgroundNormal=0,0,0
+DecorationFocus=170,170,170
+DecorationHover=150,150,150
+ForegroundActive=255,128,224
+ForegroundInactive=225,225,225
+ForegroundLink=46,184,230
+ForegroundNegative=240,1,1
+ForegroundNeutral=255,221,0
+ForegroundNormal=255,255,255
+ForegroundPositive=128,255,128
+ForegroundVisited=255,102,102
+
+[Colors:View]
+BackgroundAlternate=56,56,56
+BackgroundNormal=46,46,46
+DecorationFocus=170,170,170
+DecorationHover=150,150,150
+ForegroundActive=255,128,224
+ForegroundInactive=160,160,160
+ForegroundLink=46,184,230
+ForegroundNegative=240,1,1
+ForegroundNeutral=255,221,0
+ForegroundNormal=255,255,255
+ForegroundPositive=128,255,128
+ForegroundVisited=255,102,102
+
+[Colors:Window]
+BackgroundAlternate=49,49,49
+BackgroundNormal=61,61,62
+DecorationFocus=170,170,170
+DecorationHover=150,150,150
+ForegroundActive=255,128,224
+ForegroundInactive=160,160,160
+ForegroundLink=46,184,230
+ForegroundNegative=240,1,1
+ForegroundNeutral=255,221,0
+ForegroundNormal=255,255,255
+ForegroundPositive=128,255,128
+ForegroundVisited=255,102,102
+
+[General]
+ColorScheme=KvFlat
+Name=KvFlat
+shadeSortColumn=true
+
+[KDE]
+contrast=0
+
+[WM]
+activeBackground=61,61,62
+activeBlend=61,61,62
+activeForeground=255,255,255
+inactiveBackground=61,61,62
+inactiveBlend=61,61,62
+inactiveForeground=155,155,155

Kvantum/themes/colors/KvFlatRed.colors

@@ -0,0 +1,105 @@
+[ColorEffects:Disabled]
+Color=112,111,110
+ColorAmount=0
+ColorEffect=0
+ContrastAmount=0.65
+ContrastEffect=1
+IntensityAmount=0.1
+IntensityEffect=0
+
+[ColorEffects:Inactive]
+ChangeSelectionColor=true
+Color=112,111,110
+ColorAmount=0.025
+ColorEffect=2
+ContrastAmount=0.1
+ContrastEffect=2
+Enable=true
+IntensityAmount=0
+IntensityEffect=0
+
+[Colors:Button]
+BackgroundAlternate=74,74,74
+BackgroundNormal=85,85,85
+DecorationFocus=170,170,170
+DecorationHover=150,150,150
+ForegroundActive=255,128,224
+ForegroundInactive=160,160,160
+ForegroundLink=46,184,230
+ForegroundNegative=240,1,1
+ForegroundNeutral=255,221,0
+ForegroundNormal=255,255,255
+ForegroundPositive=128,255,128
+ForegroundVisited=255,102,102
+
+[Colors:Selection]
+BackgroundAlternate=162,18,21
+BackgroundNormal=162,18,21
+DecorationFocus=170,170,170
+DecorationHover=150,150,150
+ForegroundActive=255,128,224
+ForegroundInactive=160,160,160
+ForegroundLink=46,184,230
+ForegroundNegative=240,1,1
+ForegroundNeutral=255,221,0
+ForegroundNormal=255,255,255
+ForegroundPositive=128,255,128
+ForegroundVisited=255,102,102
+
+[Colors:Tooltip]
+BackgroundAlternate=0,0,0
+BackgroundNormal=0,0,0
+DecorationFocus=170,170,170
+DecorationHover=150,150,150
+ForegroundActive=255,128,224
+ForegroundInactive=225,225,225
+ForegroundLink=46,184,230
+ForegroundNegative=240,1,1
+ForegroundNeutral=255,221,0
+ForegroundNormal=255,255,255
+ForegroundPositive=128,255,128
+ForegroundVisited=255,102,102
+
+[Colors:View]
+BackgroundAlternate=56,56,56
+BackgroundNormal=46,46,46
+DecorationFocus=170,170,170
+DecorationHover=150,150,150
+ForegroundActive=255,128,224
+ForegroundInactive=160,160,160
+ForegroundLink=46,184,230
+ForegroundNegative=240,1,1
+ForegroundNeutral=255,221,0
+ForegroundNormal=255,255,255
+ForegroundPositive=128,255,128
+ForegroundVisited=255,102,102
+
+[Colors:Window]
+BackgroundAlternate=49,49,49
+BackgroundNormal=61,61,62
+DecorationFocus=170,170,170
+DecorationHover=150,150,150
+ForegroundActive=255,128,224
+ForegroundInactive=160,160,160
+ForegroundLink=46,184,230
+ForegroundNegative=240,1,1
+ForegroundNeutral=255,221,0
+ForegroundNormal=255,255,255
+ForegroundPositive=128,255,128
+ForegroundVisited=255,102,102
+
+[General]
+ColorScheme=KvFlatRed
+Name=KvFlatRed
+shadeSortColumn=true
+
+[KDE]
+contrast=0
+
+[WM]
+activeBackground=61,61,62
+activeBlend=61,61,62
+activeForeground=255,255,255
+inactiveBackground=61,61,62
+inactiveBlend=61,61,62
+inactiveForeground=155,155,155