allow a color lozenge behind the text to make it work on any sort of background

svn path=/trunk/KDE/kdelibs/; revision=952083

widgets/iconwidget.cpp

@@ -62,18 +62,19 @@ namespace Plasma
 IconWidgetPrivate::IconWidgetPrivate(IconWidget *i)
     : q(i),
       iconSvg(0),
-      iconSvgElementChanged(false),
-      fadeIn(false),
       hoverAnimId(-1),
       hoverAlpha(20 / 255),
       iconSize(48, 48),
       states(IconWidgetPrivate::NoState),
       orientation(Qt::Vertical),
       numDisplayLines(2),
+      action(0),
+      activeMargins(0),
+      iconSvgElementChanged(false),
+      fadeIn(false),
       invertLayout(false),
       drawBg(false),
-      action(0),
-      activeMargins(0)
+      textBgCustomized(false)
 {
 }
 
@@ -85,11 +86,16 @@ IconWidgetPrivate::~IconWidgetPrivate()
 void IconWidgetPrivate::readColors()
 {
     textColor = Plasma::Theme::defaultTheme()->color(Theme::TextColor);
+
     if (qGray(textColor.rgb()) > 192) {
         shadowColor = Qt::black;
     } else {
         shadowColor = Qt::white;
     }
+
+    if (!textBgCustomized) {
+        textBgColor = Theme::defaultTheme()->color(Theme::HighlightColor);
+    }
 }
 
 void IconWidgetPrivate::colorConfigChanged()
@@ -976,11 +982,35 @@ void IconWidget::paint(QPainter *painter, const QStyleOptionGraphicsItem *option
         shadowOffset = QPoint(0, 1);
     }
 
+
+    if (state == IconWidgetPrivate::NoState && d->textBgColor != QColor() &&
+        !(d->text.isEmpty() && d->infoText.isEmpty())) {
+        QRectF rect = textBoundingRect.adjusted(-2, -2, 4, 4);
+        painter->setPen(Qt::transparent);
+        QColor color = d->textBgColor;
+        color.setAlpha(60 * 1.0 - d->hoverAlpha);
+        painter->setBrush(color);
+        painter->setRenderHint(QPainter::Antialiasing);
+        painter->drawPath(PaintUtils::roundedRectangle(rect, 4));
+    }
+
     PaintUtils::shadowBlur(shadow, 2, d->shadowColor);
     painter->drawImage(textBoundingRect.topLeft() + shadowOffset, shadow);
     d->drawTextItems(painter, option, labelLayout, infoLayout);
 }
 
+void IconWidget::setTextBackgroundColor(const QColor &color)
+{
+    d->textBgCustomized = true;
+    d->textBgColor = color;
+    update();
+}
+
+QColor IconWidget::textBackgroundColor() const
+{
+    return d->textBgColor;
+}
+
 void IconWidget::drawActionButtonBase(QPainter *painter, const QSize &size, int element)
 {
     qreal radius = size.width() / 2;
@@ -1188,6 +1218,8 @@ void IconWidget::hoverLeaveEvent(QGraphicsSceneHoverEvent *event)
 
 bool IconWidget::sceneEventFilter(QGraphicsItem *watched, QEvent *event)
 {
+    Q_UNUSED(watched)
+
     if (event->type() == QEvent::GraphicsSceneDragEnter) {
         d->hoverEffect(true);
         update();

widgets/iconwidget.h

@@ -57,6 +57,7 @@ class PLASMA_EXPORT IconWidget : public QGraphicsWidget
     Q_PROPERTY(QString text READ text WRITE setText)
     Q_PROPERTY(QString infoText READ infoText WRITE setInfoText)
     Q_PROPERTY(QIcon icon READ icon WRITE setIcon)
+    Q_PROPERTY(QColor textBackgroundColor READ textBackgroundColor WRITE setTextBackgroundColor)
     Q_PROPERTY(QSizeF iconSize READ iconSize)
     Q_PROPERTY(QString svg WRITE setSvg)
     Q_PROPERTY(QAction *action READ action WRITE setAction)
@@ -131,6 +132,19 @@ public:
     */
     void setIcon(const QIcon &icon);
 
+    /**
+     * @return the color to use behind the text of the icon
+     * @since 4.3
+     */
+    QColor textBackgroundColor() const;
+
+    /**
+     * Sets the color to use behind the text of the icon
+     * @param color the color, or QColor() to reset it to no background color
+     * @since 4.3
+     */
+    void setTextBackgroundColor(const QColor &color);
+
     /**
     * Convenience method to set the icon of this Plasma::IconWidget
     * using a QString path to the icon.

widgets/iconwidget_p.h

@@ -194,11 +194,10 @@ public:
     Svg *iconSvg;
     FrameSvg *background;
     QString iconSvgElement;
-    bool iconSvgElementChanged;
     QPixmap iconSvgPixmap;
     QColor textColor;
+    QColor textBgColor;
     QColor shadowColor;
-    bool fadeIn;
     int hoverAnimId;
     qreal hoverAlpha;
     QSizeF iconSize;
@@ -206,8 +205,6 @@ public:
     IconWidgetStates states;
     Qt::Orientation orientation;
     int numDisplayLines;
-    bool invertLayout;
-    bool drawBg;
     QSizeF currentSize;
     QPointF clickStartPos;
 
@@ -218,6 +215,11 @@ public:
     Margin horizontalMargin[NMargins];
     Margin *activeMargins;
 
+    bool iconSvgElementChanged : 1;
+    bool fadeIn : 1;
+    bool invertLayout : 1;
+    bool drawBg : 1;
+    bool textBgCustomized : 1;
     static const int maxDisplayLines = 5;
     static const int iconActionSize = 26;
     static const int iconActionMargin = 4;