Utils: Improved handling of StyleHelper::baseColor

This change makes sure that the "UI coloring" feature respects the
original brightness of the current theme. It prevents dark themes from
getting a too light recoloring and vice versa.

Extra benefit: this allows to remove much recently introduced code.

Change-Id: Ib2c96e7ed172a4cc97520aa4b5d180cc6353c661
Reviewed-by: hjk <hjk@theqtcompany.com>

share/qtcreator/themes/default.creatortheme

@@ -77,7 +77,7 @@ MiniProjectTargetSelectorBackgroundColor=ffa0a0a0
 MiniProjectTargetSelectorBorderColor=ff000000
 MiniProjectTargetSelectorSummaryBackgroundColor=ff464646
 MiniProjectTargetSelectorTextColor=a0ffffff
-PanelStatusBarBackgroundColor=ffff0000
+PanelStatusBarBackgroundColor=ff626262
 PanelsWidgetSeparatorLineColor=ffbfbcb8
 PanelTextColorDark=darkText
 PanelTextColorMid=ff909090

src/libs/utils/stylehelper.cpp

@@ -25,6 +25,7 @@
 
 #include "stylehelper.h"
 
+#include "theme/theme.h"
 #include "hostosinfo.h"
 
 #include <QPixmapCache>
@@ -108,11 +109,6 @@ QColor StyleHelper::baseColor(bool lightColored)
         return m_baseColor.lighter(230);
 }
 
-bool StyleHelper::isBaseColorDefault()
-{
-    return m_requestedBaseColor == DEFAULT_BASE_COLOR;
-}
-
 QColor StyleHelper::highlightColor(bool lightColored)
 {
     QColor result = baseColor(lightColored);
@@ -152,10 +148,20 @@ void StyleHelper::setBaseColor(const QColor &newcolor)
 {
     m_requestedBaseColor = newcolor;
 
+    const QColor themeBaseColor = creatorTheme()->color(Theme::PanelStatusBarBackgroundColor);
+    const QColor defaultBaseColor = QColor(DEFAULT_BASE_COLOR);
     QColor color;
-    color.setHsv(newcolor.hue(),
-                 newcolor.saturation() * 0.7,
-                 64 + newcolor.value() / 3);
+
+    if (defaultBaseColor == newcolor) {
+        color = themeBaseColor;
+    } else {
+        const int valueDelta = (newcolor.value() - defaultBaseColor.value()) / 3;
+        const int value = qBound(0, themeBaseColor.value() + valueDelta, 255);
+
+        color.setHsv(newcolor.hue(),
+                     newcolor.saturation() * 0.7,
+                     value);
+    }
 
     if (color.isValid() && color != m_baseColor) {
         m_baseColor = color;

src/libs/utils/stylehelper.h

@@ -56,7 +56,6 @@ public:
     // This is our color table, all colors derive from baseColor
     static QColor requestedBaseColor() { return m_requestedBaseColor; }
     static QColor baseColor(bool lightColored = false);
-    static bool isBaseColorDefault();
     static QColor panelTextColor(bool lightColored = false);
     static QColor highlightColor(bool lightColored = false);
     static QColor shadowColor(bool lightColored = false);

src/plugins/coreplugin/fancyactionbar.cpp

@@ -272,9 +272,7 @@ void FancyActionBar::paintEvent(QPaintEvent *event)
     if (creatorTheme()->widgetStyle () == Theme::StyleFlat) {
         // this paints the background of the bottom portion of the
         // left tab bar
-        painter.fillRect(event->rect(), StyleHelper::isBaseColorDefault()
-                         ? creatorTheme()->color(Theme::FancyTabBarBackgroundColor)
-                         : StyleHelper::baseColor());
+        painter.fillRect(event->rect(), StyleHelper::baseColor());
         painter.setPen(creatorTheme()->color(Theme::FancyToolBarSeparatorColor));
         painter.drawLine(borderRect.topLeft(), borderRect.topRight());
     } else {

src/plugins/coreplugin/fancytabwidget.cpp

@@ -118,9 +118,7 @@ void FancyTabBar::paintEvent(QPaintEvent *event)
     if (creatorTheme()->widgetStyle() == Theme::StyleFlat) {
         // draw background of upper part of left tab widget
         // (Welcome, ... Help)
-        p.fillRect(event->rect(), StyleHelper::isBaseColorDefault()
-                   ? creatorTheme()->color(Theme::FancyTabBarBackgroundColor)
-                   : StyleHelper::baseColor());
+        p.fillRect(event->rect(), StyleHelper::baseColor());
     }
 
     for (int i = 0; i < count(); ++i)

src/plugins/coreplugin/manhattanstyle.cpp

@@ -528,9 +528,7 @@ void ManhattanStyle::drawPrimitive(PrimitiveElement element, const QStyleOption
                 painter->drawLine(borderRect.topLeft(), borderRect.topRight());
                 painter->restore();
             } else {
-                painter->fillRect(rect, StyleHelper::isBaseColorDefault()
-                                  ? creatorTheme()->color(Theme::PanelStatusBarBackgroundColor)
-                                  : StyleHelper::baseColor());
+                painter->fillRect(rect, StyleHelper::baseColor());
             }
         }
         break;
@@ -653,9 +651,7 @@ void ManhattanStyle::drawControl(ControlElement element, const QStyleOption *opt
             const bool dis = !(mbi->state & State_Enabled);
 
             if (creatorTheme()->flag(Theme::FlatMenuBar))
-                painter->fillRect(option->rect, StyleHelper::isBaseColorDefault()
-                                  ? creatorTheme()->color(Theme::MenuBarItemBackgroundColor)
-                                  : StyleHelper::baseColor());
+                painter->fillRect(option->rect, StyleHelper::baseColor());
             else
                 StyleHelper::menuGradient(painter, option->rect, option->rect);
 
@@ -793,9 +789,7 @@ void ManhattanStyle::drawControl(ControlElement element, const QStyleOption *opt
                                   option->rect.bottomRight() + QPointF(0.5, 0.5));
                 painter->restore();
             } else {
-                painter->fillRect(option->rect, StyleHelper::isBaseColorDefault()
-                                  ? creatorTheme()->color(Theme::MenuBarEmptyAreaBackgroundColor)
-                                  : StyleHelper::baseColor());
+                painter->fillRect(option->rect, StyleHelper::baseColor());
             }
         }
         break;
@@ -817,9 +811,7 @@ void ManhattanStyle::drawControl(ControlElement element, const QStyleOption *opt
             bool drawLightColored = lightColored(widget);
             // draws the background of the 'Type hierarchy', 'Projects' headers
             if (creatorTheme()->widgetStyle() == Theme::StyleFlat)
-                painter->fillRect(rect, StyleHelper::isBaseColorDefault()
-                                  ? creatorTheme()->color(Theme::ToolBarBackgroundColor)
-                                  : StyleHelper::baseColor(drawLightColored));
+                painter->fillRect(rect, StyleHelper::baseColor(drawLightColored));
             else if (horizontal)
                 StyleHelper::horizontalGradient(painter, gradientSpan, rect, drawLightColored);
             else

src/plugins/coreplugin/progressmanager/futureprogress.cpp

@@ -296,9 +296,7 @@ void FutureProgress::paintEvent(QPaintEvent *)
 {
     QPainter p(this);
     if (creatorTheme()->widgetStyle() == Theme::StyleFlat) {
-        p.fillRect(rect(), StyleHelper::isBaseColorDefault()
-                   ? creatorTheme()->color(Theme::FutureProgressBackgroundColor)
-                   : StyleHelper::baseColor());
+        p.fillRect(rect(), StyleHelper::baseColor());
     } else {
       QLinearGradient grad = StyleHelper::statusBarGradient(rect());
         p.fillRect(rect(), grad);