gestures: Set kwin touch area to be gesture guide area height

Use a heuristic (the height of the gesture guide panel) to set the
gesture trigger area.

components/mobileshell/qml/components/Constants.qml

@@ -40,6 +40,13 @@ QtObject {
         return root.panelSettings.navigationPanelHeight;
     }
 
+    readonly property real screenEdgeTouchTarget: (ShellSettings.Settings.gesturePanelEnabled && !ShellSettings.Settings.navigationPanelEnabled) ? defaultGesturePanelThickness : 8
+    onScreenEdgeTouchTargetChanged: {
+        if (ShellSettings.KWinSettings.screenEdgeTouchTarget != screenEdgeTouchTarget) {
+            ShellSettings.KWinSettings.screenEdgeTouchTarget = screenEdgeTouchTarget;
+        }
+    }
+
     function navigationPanelOnSide(screenWidth: real, screenHeight: real): bool {
         // TODO: we have this disabled for now, we might consider just removing this feature entirely due to it causing several issues:
         //       (the feature being the navigation panel being moved to the right when the screen height is small)

components/shellsettingsplugin/kwinsettings.cpp

@@ -7,17 +7,22 @@
 #include "kwinsettings.h"
 
 const QString CONFIG_FILE = QStringLiteral("kwinrc");
+const QString OVERLAY_CONFIG_FILE = QStringLiteral("plasma-mobile/kwinrc");
 const QString WAYLAND_CONFIG_GROUP = QStringLiteral("Wayland");
+const QString SCREEN_EDGES_CONFIG_GROUP = QStringLiteral("ScreenEdges");
 
 KWinSettings::KWinSettings(QObject *parent)
     : QObject{parent}
     , m_config{KSharedConfig::openConfig(CONFIG_FILE)}
+    , m_overlayConfig{KSharedConfig::openConfig(OVERLAY_CONFIG_FILE)}
 {
     m_configWatcher = KConfigWatcher::create(m_config);
     connect(m_configWatcher.data(), &KConfigWatcher::configChanged, this, [this](const KConfigGroup &group, const QByteArrayList &names) -> void {
         Q_UNUSED(names)
         if (group.name() == WAYLAND_CONFIG_GROUP) {
             Q_EMIT doubleTapWakeupChanged();
+        } else if (group.name() == SCREEN_EDGES_CONFIG_GROUP) {
+            Q_EMIT screenEdgeTouchTargetChanged();
         }
     });
 }
@@ -30,7 +35,25 @@ bool KWinSettings::doubleTapWakeup() const
 
 void KWinSettings::setDoubleTapWakeup(bool enabled)
 {
-    auto group = KConfigGroup{m_config, WAYLAND_CONFIG_GROUP};
-    group.writeEntry("DoubleTapWakeup", enabled, KConfigGroup::Notify);
-    m_config->sync();
+    if (enabled != doubleTapWakeup()) {
+        auto group = KConfigGroup{m_config, WAYLAND_CONFIG_GROUP};
+        group.writeEntry("DoubleTapWakeup", enabled, KConfigGroup::Notify);
+        m_config->sync();
+    }
+}
+
+int KWinSettings::screenEdgeTouchTarget() const
+{
+    auto group = KConfigGroup{m_overlayConfig, SCREEN_EDGES_CONFIG_GROUP};
+    return group.readEntry("TouchTarget", 0);
+}
+
+void KWinSettings::setScreenEdgeTouchTarget(int target)
+{
+    // Use m_overlayConfig instead of m_config so we don't affect other shells
+    if (target != screenEdgeTouchTarget()) {
+        auto group = KConfigGroup{m_overlayConfig, SCREEN_EDGES_CONFIG_GROUP};
+        group.writeEntry("TouchTarget", target, KConfigGroup::Notify);
+        m_overlayConfig->sync();
+    }
 }

components/shellsettingsplugin/kwinsettings.h

@@ -19,6 +19,7 @@ class KWinSettings : public QObject
     QML_SINGLETON
 
     Q_PROPERTY(bool doubleTapWakeup READ doubleTapWakeup WRITE setDoubleTapWakeup NOTIFY doubleTapWakeupChanged)
+    Q_PROPERTY(int screenEdgeTouchTarget READ screenEdgeTouchTarget WRITE setScreenEdgeTouchTarget NOTIFY screenEdgeTouchTargetChanged)
 
 public:
     KWinSettings(QObject *parent = nullptr);
@@ -35,10 +36,24 @@ public:
      */
     void setDoubleTapWakeup(bool enabled);
 
+    /**
+     * Get the screen edge touch target value.
+     */
+    int screenEdgeTouchTarget() const;
+
+    /**
+     * Set the screen edge touch target value.
+     *
+     * @param target
+     */
+    void setScreenEdgeTouchTarget(int target);
+
 Q_SIGNALS:
     void doubleTapWakeupChanged();
+    void screenEdgeTouchTargetChanged();
 
 private:
     KConfigWatcher::Ptr m_configWatcher;
     KSharedConfig::Ptr m_config;
+    KSharedConfig::Ptr m_overlayConfig;
 };

containments/taskpanel/CMakeLists.txt

@@ -7,6 +7,7 @@ plasma_add_applet(org.kde.plasma.mobile.taskpanel
     QML_SOURCES
         qml/main.qml
         qml/NavigationPanelComponent.qml
+        qml/GesturePanelComponent.qml
     CPP_SOURCES
         taskpanel.cpp
 )

containments/taskpanel/qml/GesturePanelComponent.qml

@@ -0,0 +1,20 @@
+// SPDX-FileCopyrightText: 2015 Marco Martin <mart@kde.org>
+// SPDX-FileCopyrightText: 2021-2023 Devin Lin <devin@kde.org>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+import QtQuick
+
+import org.kde.kirigami 2.20 as Kirigami
+
+import org.kde.plasma.plasmoid
+
+import org.kde.plasma.private.mobileshell as MobileShell
+import org.kde.plasma.private.mobileshell.state as MobileShellState
+import org.kde.plasma.private.mobileshell.shellsettingsplugin as ShellSettings
+
+MobileShell.GesturePanel {
+    id: root
+
+    onHandlePressedAndHeld: MobileShellState.ShellDBusClient.openHomeScreen()
+    onHandleClicked: Plasmoid.triggerTaskSwitcher()
+}

containments/taskpanel/qml/main.qml

@@ -197,15 +197,12 @@ ContainmentItem {
         Component {
             id: gesturePanelComponent
 
-            MobileShell.GesturePanel {
+            GesturePanelComponent {
                 opaqueBar: root.opaqueBar
 
                 Kirigami.Theme.inherit: false
                 Kirigami.Theme.colorSet: (!opaqueBar && !startupFeedbackColorAnimation.isShowing) ? Kirigami.Theme.Complementary : Kirigami.Theme.Window
 
-                onHandlePressedAndHeld: MobileShellState.ShellDBusClient.openHomeScreen()
-                onHandleClicked: Plasmoid.triggerTaskSwitcher()
-
                 transform: [
                     Translate {
                         y: inLandscape ? 0 : navigationPanel.offset