Add ScrollBar::interactive

[ChangeLog][Controls][ScrollBar] Added an interactive-property.
A non-interactive ScrollBar is visually and behaviorally similar
to ScrollIndicator. This property is useful for switching between
typical mouse- and touch-orientated UIs with interactive and non-
interactive scroll bars, respectively.

Change-Id: Ie98bfa0b5bba94a9751baf3c65f17b850b58fd1f
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

2 files changed, 37 insertions, 1 deletions

diff --git a/src/quicktemplates2/qquickscrollbar.cpp b/src/quicktemplates2/qquickscrollbar.cpp
index 66df3dc9..f7a5c246 100644
--- a/src/quicktemplates2/qquickscrollbar.cpp
+++ b/src/quicktemplates2/qquickscrollbar.cpp
@@ -164,6 +164,7 @@ public:
           active(false),
           pressed(false),
           moving(false),
+          interactive(true),
           orientation(Qt::Vertical),
           snapMode(QQuickScrollBar::NoSnap)
     {
@@ -191,6 +192,7 @@ public:
     bool active;
     bool pressed;
     bool moving;
+    bool interactive;
     Qt::Orientation orientation;
     QQuickScrollBar::SnapMode snapMode;
 };
@@ -216,7 +218,7 @@ qreal QQuickScrollBarPrivate::positionAt(const QPointF &point) const
 void QQuickScrollBarPrivate::updateActive()
 {
     Q_Q(QQuickScrollBar);
-    q->setActive(moving || pressed || hovered);
+    q->setActive(moving || (interactive && (pressed || hovered)));
 }
 
 void QQuickScrollBarPrivate::resizeContent()
@@ -489,6 +491,35 @@ void QQuickScrollBar::setSnapMode(SnapMode mode)
 }
 
 /*!
+    \since QtQuick.Controls 2.2
+    \qmlproperty bool QtQuick.Controls::ScrollBar::interactive
+
+    This property holds whether the scroll bar is interactive. The default value is \c true.
+
+    A non-interactive scroll bar is visually and behaviorally similar to \l ScrollIndicator.
+    This property is useful for switching between typical mouse- and touch-orientated UIs
+    with interactive and non-interactive scroll bars, respectively.
+*/
+bool QQuickScrollBar::isInteractive() const
+{
+    Q_D(const QQuickScrollBar);
+    return d->interactive;
+}
+
+void QQuickScrollBar::setInteractive(bool interactive)
+{
+    Q_D(QQuickScrollBar);
+    if (d->interactive == interactive)
+        return;
+
+    d->interactive = interactive;
+    setAcceptedMouseButtons(interactive ? Qt::LeftButton : Qt::NoButton);
+    if (!interactive)
+        ungrabMouse();
+    emit interactiveChanged();
+}
+
+/*!
     \qmlmethod void QtQuick.Controls::ScrollBar::increase()
 
     Increases the position by \l stepSize or \c 0.1 if stepSize is \c 0.0.
diff --git a/src/quicktemplates2/qquickscrollbar_p.h b/src/quicktemplates2/qquickscrollbar_p.h
index a34c337c..9709f183 100644
--- a/src/quicktemplates2/qquickscrollbar_p.h
+++ b/src/quicktemplates2/qquickscrollbar_p.h
@@ -66,6 +66,7 @@ class Q_QUICKTEMPLATES2_PRIVATE_EXPORT QQuickScrollBar : public QQuickControl
     Q_PROPERTY(bool pressed READ isPressed WRITE setPressed NOTIFY pressedChanged FINAL)
     Q_PROPERTY(Qt::Orientation orientation READ orientation WRITE setOrientation NOTIFY orientationChanged FINAL)
     Q_PROPERTY(SnapMode snapMode READ snapMode WRITE setSnapMode NOTIFY snapModeChanged FINAL REVISION 2)
+    Q_PROPERTY(bool interactive READ isInteractive WRITE setInteractive NOTIFY interactiveChanged FINAL REVISION 2)
 
 public:
     explicit QQuickScrollBar(QQuickItem *parent = nullptr);
@@ -97,6 +98,9 @@ public:
     SnapMode snapMode() const;
     void setSnapMode(SnapMode mode);
 
+    bool isInteractive() const;
+    void setInteractive(bool interactive);
+
 public Q_SLOTS:
     void increase();
     void decrease();
@@ -111,6 +115,7 @@ Q_SIGNALS:
     void pressedChanged();
     void orientationChanged();
     Q_REVISION(2) void snapModeChanged();
+    Q_REVISION(2) void interactiveChanged();
 
 protected:
     void mousePressEvent(QMouseEvent *event) override;