Add dragThreshold property to Event Handlers

We need drag threshold to be adjustable on each handler instance instead
of relying only on the system default drag threshold. For example in
some use cases DragHandler needs to work with a threshold of 0 or 1 to
start dragging as soon as the point is pressed or as soon as the point
is moved, with no "jump", to enable fine adjustment of a value on some
control such as a Slider.

This involves moving the dragOverThreshold() functions that handlers are
using from QQuickWindowPrivate to QQuickPointerHandlerPrivate, so that
they can use the adjustable threshold value.

Task-number: QTBUG-68075
Change-Id: Ie720cbbf9f30abb40d1731d92f8e7f1e6534eeb5
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>

1 files changed, 0 insertions, 20 deletions

diff --git a/src/quick/items/qquickwindow_p.h b/src/quick/items/qquickwindow_p.h
index becbae7fe3..5d44e28bac 100644
--- a/src/quick/items/qquickwindow_p.h
+++ b/src/quick/items/qquickwindow_p.h
@@ -288,26 +288,6 @@ public:
 
     static bool dragOverThreshold(qreal d, Qt::Axis axis, QMouseEvent *event, int startDragThreshold = -1);
 
-    template <typename TEventPoint>
-    static bool dragOverThreshold(qreal d, Qt::Axis axis, const TEventPoint *p, int startDragThreshold = -1)
-    {
-        QStyleHints *styleHints = qApp->styleHints();
-        bool overThreshold = qAbs(d) > (startDragThreshold >= 0 ? startDragThreshold : styleHints->startDragDistance());
-        const bool dragVelocityLimitAvailable = (styleHints->startDragVelocity() > 0);
-        if (!overThreshold && dragVelocityLimitAvailable) {
-            qreal velocity = axis == Qt::XAxis ? p->velocity().x() : p->velocity().y();
-            overThreshold |= qAbs(velocity) > styleHints->startDragVelocity();
-        }
-        return overThreshold;
-    }
-
-    static bool dragOverThreshold(const QQuickEventPoint *point)
-    {
-        QPointF delta = point->scenePosition() - point->scenePressPosition();
-        return (QQuickWindowPrivate::dragOverThreshold(delta.x(), Qt::XAxis, point) ||
-                QQuickWindowPrivate::dragOverThreshold(delta.y(), Qt::YAxis, point));
-    }
-
     static bool dragOverThreshold(QVector2D delta);
 
     // data property