Make DragHandler a MultiPointHandler

That is, minimumPointCount can now be set to a value > 1 to require
multiple fingers to do the dragging, or to track the displacement
of multiple fingers to adjust some value (such as the tilt of a map).

Task-number: QTBUG-68106
Change-Id: Ib35823e36deb81c8b277d3070fcc758c7c019564
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/manual/pointer/map.qml b/tests/manual/pointer/map.qml
index ae7ec042d3..3ed732b523 100644
--- a/tests/manual/pointer/map.qml
+++ b/tests/manual/pointer/map.qml
@@ -39,6 +39,7 @@ Item {
         y: (parent.height - height) / 2
         width: image.width
         height: image.height
+        transform: Rotation { id: tilt; origin.x: width / 2; origin.y: height / 2; axis { x: 1; y: 0; z: 0 } }
 
         Image {
             id: image
@@ -57,16 +58,29 @@ Item {
 
     PinchHandler {
         id: pinch
+        objectName: "two-point pinch"
         target: map
         minimumScale: 0.1
         maximumScale: 10
         onActiveChanged: if (!active) reRenderIfNecessary()
+        grabPermissions: PinchHandler.TakeOverForbidden // don't allow takeover if pinch has started
     }
 
     DragHandler {
+        objectName: "single-point drag"
         target: map
     }
 
+    DragHandler {
+        id: tiltHandler
+        objectName: "two-point tilt"
+        minimumPointCount: 2
+        maximumPointCount: 2
+        xAxis.enabled: false
+        target: null
+        onTranslationChanged: tilt.angle = translation.y / -2
+    }
+
     function reRenderIfNecessary() {
         var newSourceWidth = image.sourceSize.width * pinch.scale
         var ratio = newSourceWidth / image.sourceSize.width