homescreen: Add swipe down panel gesture

components/mobilehomescreencomponents/qml/private/DragGestureHandler.qml

@@ -8,6 +8,7 @@
 import QtQuick 2.14
 
 import org.kde.plasma.core 2.0 as PlasmaCore
+import org.kde.plasma.private.mobileshell 1.0 as MobileShell
 
 import ".." as Launcher
 
@@ -29,6 +30,7 @@ DragHandler {
     }
 
     property real __initialMainFlickableX
+    property real __oldTranslationY: 0
     property int __scrollDirection: DragGestureHandler.None
     onTranslationChanged: {
         if (active) {
@@ -50,7 +52,20 @@ DragHandler {
                 }
 
                 if (__scrollDirection !== DragGestureHandler.Left && __scrollDirection !== DragGestureHandler.Right) {
+                    // if swipe up, scroll app drawer
                     root.appDrawer.flickable.contentY = Math.min(root.appDrawer.drawerTopMargin, Math.max(0, -translation.y));
+                    
+                    if (translation.y < 0 && MobileShell.TopPanelControls.inSwipe) {
+                        MobileShell.TopPanelControls.endSwipe();
+                    }
+                    
+                    // if swipe down, scroll top panel
+                    if (translation.y > 0) {
+                        if (!MobileShell.TopPanelControls.inSwipe) {
+                            MobileShell.TopPanelControls.startSwipe();
+                        }
+                        MobileShell.TopPanelControls.requestRelativeScroll(translation.y - __oldTranslationY);
+                    }
                 }
             }
             if (__scrollDirection !== DragGestureHandler.Vertical) {
@@ -67,7 +82,10 @@ DragHandler {
                 mainFlickable.contentX = newContentX;
             }
         }
+        
+        __oldTranslationY = translation.y;
     }
+    
     onActiveChanged: {
         if (active) {
             __initialMainFlickableX = mainFlickable.contentX;
@@ -75,6 +93,9 @@ DragHandler {
             if (root.appDrawer) {
                 root.appDrawer.snapDrawerStatus();
             }
+            if (MobileShell.TopPanelControls.inSwipe) {
+                MobileShell.TopPanelControls.endSwipe();
+            }
             if (__scrollDirection === DragGestureHandler.Left && (__initialMainFlickableX - mainFlickable.contentX > PlasmaCore.Units.gridUnit * 5)) {
                 snapPrevPage();
             } else if (__scrollDirection === DragGestureHandler.Right && (mainFlickable.contentX - __initialMainFlickableX > PlasmaCore.Units.gridUnit * 5)) {

components/mobileshell/TopPanelControls.qml

@@ -11,5 +11,10 @@ pragma Singleton
 
 QtObject {
     id: root
+    
+    signal startSwipe()
+    signal endSwipe()
+    signal requestRelativeScroll(real offsetY)
+    property bool inSwipe: false
     property real panelHeight: PlasmaCore.Units.gridUnit // set and updated in panel containment
 }

containments/homescreen/package/contents/ui/main.qml

@@ -39,7 +39,7 @@ FocusScope {
 
 //END functions
 
-    // implement API signals
+//BEGIN API implementation
     Connections {
         target: MobileShell.HomeScreenControls
         
@@ -60,6 +60,7 @@ FocusScope {
             lastRequestedPosition = pos.y;
         }
     }
+//END API implementation
 
     property bool componentComplete: false
     onWidthChanged: recalculateMaxFavoriteCount()

containments/panel/package/contents/ui/main.qml

@@ -34,19 +34,34 @@ Item {
     width: 480
     height: PlasmaCore.Units.gridUnit
     
-    // set height binding to top panel API
+//BEGIN API implementation
+
     Binding {
         target: MobileShell.TopPanelControls
         property: "panelHeight"
         value: root.height
     }
+    Binding {
+        target: MobileShell.TopPanelControls
+        property: "inSwipe"
+        value: slidingPanel.userInteracting
+    }
     
-    // set height binding to top panel API
+    Connections {
-    Binding {
         target: MobileShell.TopPanelControls
-        property: "panelHeight"
+        
-        value: root.height
+        function onStartSwipe() {
+            swipeMouseArea.startSwipe(0);
         }
+        function onEndSwipe() {
+            swipeMouseArea.endSwipe();
+        }
+        function onRequestRelativeScroll(offsetY) {
+            swipeMouseArea.updateOffset(offsetY);
+        }
+    }
+    
+//END API implementation
 
     Plasmoid.backgroundHints: showingApp ? PlasmaCore.Types.StandardBackground : PlasmaCore.Types.NoBackground
 
@@ -196,31 +211,39 @@ Item {
         showDropShadow: !showingApp
     }
     
-    // initial swipe down
+    // initial swipe down gesture
     MouseArea {
+        id: swipeMouseArea
         z: 99
         property int oldMouseY: 0
 
-        anchors.fill: parent
+        function startSwipe(mouseX) {
-        onPressed: {
             slidingPanel.cancelAnimations();
-            slidingPanel.drawerX = Math.min(Math.max(0, mouse.x - slidingPanel.drawerWidth/2), slidingPanel.width - slidingPanel.contentItem.width)
+            slidingPanel.drawerX = Math.min(Math.max(0, mouseX - slidingPanel.drawerWidth/2), slidingPanel.width - slidingPanel.contentItem.width)
             slidingPanel.userInteracting = true;
             slidingPanel.flickable.contentY = slidingPanel.closedContentY;
-            oldMouseY = mouse.y;
             slidingPanel.visible = true;
         }
-        onPositionChanged: {
+        
-            slidingPanel.updateOffset(mouse.y - oldMouseY);
+        function endSwipe() {
+            slidingPanel.userInteracting = false;
+            slidingPanel.updateState();
+        }
+        
+        function updateOffset(offsetY) {
+            slidingPanel.updateOffset(offsetY);
+        }
+        
+        anchors.fill: parent
+        onPressed: {
             oldMouseY = mouse.y;
+            startSwipe(mouse.x);
         }
-        onReleased: {
+        onReleased: endSwipe()
-            slidingPanel.userInteracting = false;
+        onCanceled: endSwipe()
-            slidingPanel.updateState();
+        onPositionChanged: {
-        }
+            updateOffset(mouse.y - oldMouseY);
-        onCanceled: {
+            oldMouseY = mouse.y;
-            slidingPanel.userInteracting = false;
-            slidingPanel.updateState();
         }
     }