scripting: add isEffectActive to query effect active state

src/effects.cpp

@@ -1421,6 +1421,17 @@ QStringList EffectsHandlerImpl::activeEffects() const
     return ret;
 }
 
+bool EffectsHandlerImpl::isEffectActive(const QString &pluginId) const
+{
+    auto it = std::find_if(loaded_effects.cbegin(), loaded_effects.cend(), [&pluginId](const EffectPair &p) {
+        return p.first == pluginId;
+    });
+    if (it == loaded_effects.cend()) {
+        return false;
+    }
+    return it->second->isActive();
+}
+
 bool EffectsHandlerImpl::blocksDirectScanout() const
 {
     return std::any_of(m_activeEffects.constBegin(), m_activeEffects.constEnd(), [](const Effect *effect) {

src/effects.h

@@ -177,6 +177,7 @@ public:
     QStringList listOfEffects() const;
     void unloadAllEffects();
     QStringList activeEffects() const;
+    bool isEffectActive(const QString &pluginId) const;
 
     /**
      * @returns whether or not any effect is currently active where KWin should not use direct scanout

src/scripting/workspace_wrapper.cpp

@@ -12,6 +12,7 @@
 #include "core/output.h"
 #include "core/outputbackend.h"
 #include "cursor.h"
+#include "effects.h"
 #include "outline.h"
 #include "tiles/tilemanager.h"
 #include "virtualdesktops.h"
@@ -327,6 +328,14 @@ QList<KWin::Window *> WorkspaceWrapper::windowAt(const QPointF &pos, int count)
     return result;
 }
 
+bool WorkspaceWrapper::isEffectActive(const QString &pluginId) const
+{
+    if (!effects) {
+        return false;
+    }
+    return static_cast<EffectsHandlerImpl *>(effects)->isEffectActive(pluginId);
+}
+
 QSize WorkspaceWrapper::desktopGridSize() const
 {
     return VirtualDesktopManager::self()->grid().size();

src/scripting/workspace_wrapper.h

@@ -256,6 +256,14 @@ public:
      */
     Q_INVOKABLE QList<KWin::Window *> windowAt(const QPointF &pos, int count = 1) const;
 
+    /**
+     * Checks if a specific effect is currently active.
+     * @param pluginId The plugin Id of the effect to check.
+     * @return @c true if the effect is loaded and currently active, @c false otherwise.
+     * @since 6.0
+     */
+    Q_INVOKABLE bool isEffectActive(const QString &pluginId) const;
+
 public Q_SLOTS:
     // all the available key bindings
     void slotSwitchDesktopNext();