From c1e71289082ec7416ac19c822393ea70f63d1b75 Mon Sep 17 00:00:00 2001
From: Akseli Lahtinen <akselmo@akselmo.dev>
Date: Fri, 20 Jun 2025 00:15:31 +0300
Subject: New selection effects

This adds a new selection effect that is similar to what we have in QtQuick file item views.

There are also changes to some usability: Instead of only the icon and text being the clickable area in icon and details mode, the whole selection is now the clickable area.

Otherwise the usability should stay the same, it's mostly a visual change.

See also: https://invent.kde.org/teams/vdg/issues/-/issues/94
---
 src/kitemviews/kitemlistwidget.cpp | 72 +++++++++++++++++++++++++++++---------
 1 file changed, 56 insertions(+), 16 deletions(-)

(limited to 'src/kitemviews/kitemlistwidget.cpp')

diff --git a/src/kitemviews/kitemlistwidget.cpp b/src/kitemviews/kitemlistwidget.cpp
index baf244572..c06e46339 100644
--- a/src/kitemviews/kitemlistwidget.cpp
+++ b/src/kitemviews/kitemlistwidget.cpp
@@ -37,6 +37,7 @@ KItemListWidget::KItemListWidget(KItemListWidgetInformant *informant, QGraphicsI
     , m_expansionAreaHovered(false)
     , m_alternateBackground(false)
     , m_enabledSelectionToggle(false)
+    , m_clickHighlighted(false)
     , m_data()
     , m_visibleRoles()
     , m_columnWidths()
@@ -124,23 +125,11 @@ void KItemListWidget::paint(QPainter *painter, const QStyleOptionGraphicsItem *o
         painter->fillRect(backgroundRect, backgroundColor);
     }
 
-    if (m_selected && m_editedRole.isEmpty()) {
+    if ((m_selected || m_current) && m_editedRole.isEmpty()) {
         const QStyle::State activeState(isActiveWindow() && widget->hasFocus() ? QStyle::State_Active : 0);
         drawItemStyleOption(painter, widget, activeState | QStyle::State_Enabled | QStyle::State_Selected | QStyle::State_Item);
     }
 
-    if (m_current && m_editedRole.isEmpty()) {
-        QStyleOptionFocusRect focusRectOption;
-        initStyleOption(&focusRectOption);
-        focusRectOption.rect = textFocusRect().toRect();
-        focusRectOption.state = QStyle::State_Enabled | QStyle::State_Item | QStyle::State_KeyboardFocusChange;
-        if (m_selected && widget->hasFocus()) {
-            focusRectOption.state |= QStyle::State_Selected;
-        }
-
-        style()->drawPrimitive(QStyle::PE_FrameFocusRect, &focusRectOption, painter, widget);
-    }
-
     if (m_hoverOpacity > 0.0) {
         if (!m_hoverCache) {
             // Initialize the m_hoverCache pixmap to improve the drawing performance
@@ -419,7 +408,7 @@ bool KItemListWidget::contains(const QPointF &point) const
         return false;
     }
 
-    return iconRect().contains(point) || textRect().contains(point) || expansionToggleRect().contains(point) || selectionToggleRect().contains(point);
+    return selectionRectFull().contains(point) || expansionToggleRect().contains(point);
 }
 
 QRectF KItemListWidget::textFocusRect() const
@@ -616,15 +605,66 @@ void KItemListWidget::clearHoverCache()
     m_hoverCache = nullptr;
 }
 
+bool KItemListWidget::isPressed() const
+{
+    return m_clickHighlighted;
+}
+
+void KItemListWidget::setPressed(bool enabled)
+{
+    if (m_clickHighlighted != enabled) {
+        m_clickHighlighted = enabled;
+        clearHoverCache();
+        update();
+    }
+}
+
 void KItemListWidget::drawItemStyleOption(QPainter *painter, QWidget *widget, QStyle::State styleState)
 {
     QStyleOptionViewItem viewItemOption;
+    constexpr int roundness = 5; // From Breeze style.
+    constexpr qreal penWidth = 1.5;
     initStyleOption(&viewItemOption);
     viewItemOption.state = styleState;
     viewItemOption.viewItemPosition = QStyleOptionViewItem::OnlyOne;
     viewItemOption.showDecorationSelected = true;
-    viewItemOption.rect = selectionRect().toRect();
-    style()->drawPrimitive(QStyle::PE_PanelItemViewItem, &viewItemOption, painter, widget);
+    viewItemOption.rect = selectionRectFull().toRect();
+    QPainterPath path;
+    path.addRoundedRect(selectionRectFull().adjusted(penWidth, penWidth, -penWidth, -penWidth), roundness, roundness);
+    QColor backgroundColor{widget->palette().color(QPalette::Accent)};
+    painter->setRenderHint(QPainter::Antialiasing);
+    bool current = m_current && styleState & QStyle::State_Active;
+
+    // Background item, alpha values are from
+    // https://invent.kde.org/plasma/libplasma/-/blob/master/src/desktoptheme/breeze/widgets/viewitem.svg
+    backgroundColor.setAlphaF(0.0);
+
+    if (m_clickHighlighted) {
+        backgroundColor.setAlphaF(1.0);
+    } else {
+        if (m_selected && m_hovered) {
+            backgroundColor.setAlphaF(0.40);
+        } else if (m_selected) {
+            backgroundColor.setAlphaF(0.32);
+        } else if (m_hovered) {
+            backgroundColor = widget->palette().color(QPalette::Text);
+            backgroundColor.setAlphaF(0.06);
+        }
+    }
+
+    painter->fillPath(path, backgroundColor);
+
+    // Focus decoration
+    if (current) {
+        QColor focusColor{widget->palette().color(QPalette::Accent)};
+        focusColor = m_styleOption.palette.color(QPalette::Base).lightnessF() > 0.5 ? focusColor.darker(110) : focusColor.lighter(110);
+        focusColor.setAlphaF(m_selected || m_hovered ? 0.8 : 0.6);
+        // Set the pen color lighter or darker depending on background color
+        QPen pen{focusColor, penWidth};
+        pen.setCosmetic(true);
+        painter->setPen(pen);
+        painter->drawPath(path);
+    }
 }
 
 #include "moc_kitemlistwidget.cpp"
-- 
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