Update icon if it couldn't be determined upfront (.desktop file on slow mount)

[dolphin.git] / src / kitemviews / kstandarditemlistwidget.cpp

diff --git a/src/kitemviews/kstandarditemlistwidget.cpp b/src/kitemviews/kstandarditemlistwidget.cpp
index e1f0f9df1c88953074f633139133a0fd70cce56f..6adb546332e234c77bcdb68313b2b87860859262 100644 (file)
--- a/src/kitemviews/kstandarditemlistwidget.cpp
+++ b/src/kitemviews/kstandarditemlistwidget.cpp
@@ -249,16 +249,46 @@ void KStandardItemListWidget::paint(QPainter* painter, const QStyleOptionGraphic
 
     const KItemListStyleOption& itemListStyleOption = styleOption();
     if (isHovered()) {
-        // Blend the unhovered and hovered pixmap if the hovering
-        // animation is ongoing
         if (hoverOpacity() < 1.0) {
-            drawPixmap(painter, m_pixmap);
-        }
+            /*
+             * Linear interpolation between m_pixmap and m_hoverPixmap.
+             *
+             * Note that this cannot be achieved by painting m_hoverPixmap over
+             * m_pixmap, even if the opacities are adjusted. For details see
+             * https://git.reviewboard.kde.org/r/109614/
+             */
+            // Paint pixmap1 so that pixmap1 = m_pixmap * (1.0 - hoverOpacity())
+            QPixmap pixmap1(option->rect.size());
+            pixmap1.fill(Qt::transparent);
+            {
+                QPainter p(&pixmap1);
+                p.setOpacity(1.0 - hoverOpacity());
+                drawPixmap(&p, m_pixmap);
+            }
+
+            // Paint pixmap2 so that pixmap2 = m_hoverPixmap * hoverOpacity()
+            QPixmap pixmap2(option->rect.size());
+            pixmap2.fill(Qt::transparent);
+            {
+                QPainter p(&pixmap2);
+                p.setOpacity(hoverOpacity());
+                drawPixmap(&p, m_hoverPixmap);
+            }
 
-        const qreal opacity = painter->opacity();
-        painter->setOpacity(hoverOpacity() * opacity);
-        drawPixmap(painter, m_hoverPixmap);
-        painter->setOpacity(opacity);
+            // Paint pixmap2 on pixmap1 using CompositionMode_Plus
+            // Now pixmap1 = pixmap2 + m_pixmap * (1.0 - hoverOpacity())
+            //             = m_hoverPixmap * hoverOpacity() + m_pixmap * (1.0 - hoverOpacity())
+            {
+                QPainter p(&pixmap1);
+                p.setCompositionMode(QPainter::CompositionMode_Plus);
+                p.drawPixmap(0, 0, pixmap2);
+            }
+
+            // Finally paint pixmap1 on the widget
+            painter->drawPixmap(0, 0, pixmap1);
+        } else {
+            drawPixmap(painter, m_hoverPixmap);
+        }
     } else {
         drawPixmap(painter, m_pixmap);
     }
@@ -840,7 +870,7 @@ void KStandardItemListWidget::updatePixmapCache()
         if (isSelected()) {
             const QColor color = palette().brush(QPalette::Normal, QPalette::Highlight).color();
             QImage image = m_pixmap.toImage();
-            KIconEffect::colorize(image, color, 1.0f);
+            KIconEffect::colorize(image, color, 0.8f);
             m_pixmap = QPixmap::fromImage(image);
         }
     }