effects/overview: Support touchpad realtime activation

Now it follows your fingers when you do a four-finger swipe up to activate it.

CCBUG: 401479

src/effects/overview/overvieweffect.cpp

@@ -30,6 +30,18 @@ OverviewEffect::OverviewEffect()
     m_shutdownTimer->setSingleShot(true);
     connect(m_shutdownTimer, &QTimer::timeout, this, &OverviewEffect::realDeactivate);
 
+    m_realtimeToggleAction = new QAction(this);
+    connect(m_realtimeToggleAction, &QAction::triggered, this, [this]() {
+        if (isRunning() && m_partialActivationFactor > 0.5) {
+            activate();
+        } else {
+            deactivate();
+        }
+        m_partialActivationFactor = 0;
+        Q_EMIT gestureInProgressChanged();
+        Q_EMIT partialActivationFactorChanged();
+    });
+
     const QKeySequence defaultToggleShortcut = Qt::META | Qt::Key_W;
     m_toggleAction = new QAction(this);
     connect(m_toggleAction, &QAction::triggered, this, &OverviewEffect::toggle);
@@ -39,10 +51,26 @@ OverviewEffect::OverviewEffect()
     KGlobalAccel::self()->setShortcut(m_toggleAction, {defaultToggleShortcut});
     m_toggleShortcut = KGlobalAccel::self()->shortcut(m_toggleAction);
     effects->registerGlobalShortcut({defaultToggleShortcut}, m_toggleAction);
-    effects->registerTouchpadSwipeShortcut(SwipeDirection::Up, 4, m_toggleAction);
     effects->registerTouchscreenSwipeShortcut(SwipeDirection::Up, 3, m_toggleAction);
     effects->registerTouchscreenSwipeShortcut(SwipeDirection::Down, 3, m_toggleAction);
 
+    auto progressCallback = [this](qreal progress) {
+        if (m_status == Status::Active) {
+            return;
+        }
+        const bool wasInProgress = m_partialActivationFactor > 0;
+        m_partialActivationFactor = progress;
+        Q_EMIT partialActivationFactorChanged();
+        if (!wasInProgress) {
+            Q_EMIT gestureInProgressChanged();
+        }
+        if (!isRunning()) {
+            partialActivate();
+        }
+    };
+
+    effects->registerRealtimeTouchpadSwipeShortcut(SwipeDirection::Up, 4, m_realtimeToggleAction, progressCallback);
+
     connect(effects, &EffectsHandler::screenAboutToLock, this, &OverviewEffect::realDeactivate);
 
     initConfig<OverviewConfig>();
@@ -90,7 +118,7 @@ void OverviewEffect::reconfigure(ReconfigureFlags)
     const QList<int> touchActivateBorders = OverviewConfig::touchBorderActivate();
     for (const int &border : touchActivateBorders) {
         m_touchBorderActivate.append(ElectricBorder(border));
-        effects->registerRealtimeTouchBorder(ElectricBorder(border), m_toggleAction, [this](ElectricBorder border, const QSizeF &deltaProgress, const EffectScreen *screen) {
+        effects->registerRealtimeTouchBorder(ElectricBorder(border), m_realtimeToggleAction, [this](ElectricBorder border, const QSizeF &deltaProgress, const EffectScreen *screen) {
             Q_UNUSED(screen)
             if (m_status == Status::Active) {
                 return;

src/effects/overview/overvieweffect.h

@@ -71,6 +71,7 @@ private:
 
     QTimer *m_shutdownTimer;
     QAction *m_toggleAction = nullptr;
+    QAction *m_realtimeToggleAction = nullptr;
     QList<QKeySequence> m_toggleShortcut;
     QList<ElectricBorder> m_borderActivate;
     QList<ElectricBorder> m_touchBorderActivate;

src/effects/presentwindows/presentwindows.cpp

@@ -82,9 +82,17 @@ PresentWindowsEffect::PresentWindowsEffect()
     KGlobalAccel::self()->setShortcut(exposeAllAction, QList<QKeySequence>() << (Qt::CTRL | Qt::Key_F10) << Qt::Key_LaunchC);
     shortcutAll = KGlobalAccel::self()->shortcut(exposeAllAction);
     effects->registerGlobalShortcut(Qt::CTRL + Qt::Key_F10, exposeAllAction);
-    effects->registerTouchpadSwipeShortcut(SwipeDirection::Down, 4, exposeAllAction);
     connect(exposeAllAction, &QAction::triggered, this, &PresentWindowsEffect::toggleActiveAllDesktops);
 
+    effects->registerRealtimeTouchpadSwipeShortcut(SwipeDirection::Down, 4, new QAction(this), [this](qreal progress) {
+        m_mode = ModeAllDesktops;
+        if (progress > .2 && !m_activated) {
+            setActive(true);
+        } else if (progress <= .2 && m_activated) {
+            setActive(false);
+        }
+    });
+
     QAction *exposeClassAction = m_exposeClassAction;
     exposeClassAction->setObjectName(QStringLiteral("ExposeClass"));
     exposeClassAction->setText(i18n("Toggle Present Windows (Window class)"));