[frameworks/kwidgetsaddons] src: KColorCombo: support d'n'dropping colors to set the color

Git commit 1078245d95a3cb9e9526b218273ad9264157b0f7 by Friedrich W. H. Kossebau.
Committed on 24/07/2026 at 21:11.
Pushed by kossebau into branch 'master'.

KColorCombo: support d'n'dropping colors to set the color

Copies the approach by KColorButton.

M  +19   -0    src/kcolorcombo.cpp
M  +2    -0    src/kcolorcombo.h

https://invent.kde.org/frameworks/kwidgetsaddons/-/commit/1078245d95a3cb9e9526b218273ad9264157b0f7

diff --git a/src/kcolorcombo.cpp b/src/kcolorcombo.cpp
index af457c60..ec3c6d4e 100644
--- a/src/kcolorcombo.cpp
+++ b/src/kcolorcombo.cpp
@@ -10,11 +10,15 @@
 #include "kcolorcombo.h"
 
 #include "kabstractcoloredit_p.h"
+#include "kcolormimedata_p.h"
 
 #include <QAbstractItemDelegate>
 #include <QApplication>
 #include <QColorDialog>
 #include <QContextMenuEvent>
+#include <QDragEnterEvent>
+#include <QDropEvent>
+#include <QMimeData>
 #include <QStylePainter>
 
 class KColorComboDelegate : public QAbstractItemDelegate
@@ -237,6 +241,8 @@ KColorCombo::KColorCombo(QWidget *parent)
     : QComboBox(parent)
     , d(new KColorComboPrivate(this))
 {
+    setAcceptDrops(true);
+
     setItemDelegate(new KColorComboDelegate(this));
     d->addColors();
 
@@ -329,6 +335,19 @@ void KColorCombo::showEmptyList()
     clear();
 }
 
+void KColorCombo::dragEnterEvent(QDragEnterEvent *event)
+{
+    event->setAccepted(KColorMimeData::canDecode(event->mimeData()) && isEnabled());
+}
+
+void KColorCombo::dropEvent(QDropEvent *event)
+{
+    const QColor c = KColorMimeData::fromMimeData(event->mimeData());
+    if (c.isValid()) {
+        setColor(c);
+    }
+}
+
 void KColorComboPrivate::slotActivated(int index)
 {
     Q_Q(KColorCombo);
diff --git a/src/kcolorcombo.h b/src/kcolorcombo.h
index bf6f7dc6..e759cc6b 100644
--- a/src/kcolorcombo.h
+++ b/src/kcolorcombo.h
@@ -99,6 +99,8 @@ Q_SIGNALS:
     void highlighted(const QColor &col);
 
 protected:
+    void dragEnterEvent(QDragEnterEvent *event) override;
+    void dropEvent(QDropEvent *event) override;
     void paintEvent(QPaintEvent *event) override;
     void contextMenuEvent(QContextMenuEvent *) override;