RangeModel: Emit min/max and value changes after component is complete

Prevent extra value changed signal to be fired in case when Slider with
minimum > 0 and value > minimum are set.

Change-Id: I86824c403a7c0296f782d2eec7ed30acfc13b304
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

3 files changed, 38 insertions, 5 deletions

diff --git a/src/controls/Private/qquickrangemodel.cpp b/src/controls/Private/qquickrangemodel.cpp
index 02ce0e57..36d7dd34 100644
--- a/src/controls/Private/qquickrangemodel.cpp
+++ b/src/controls/Private/qquickrangemodel.cpp
@@ -69,6 +69,9 @@ void QQuickRangeModelPrivate::init()
     posatmin = 0;
     posatmax = 0;
     inverted = false;
+    isComplete = false;
+    positionChanged = false;
+    valueChanged = false;
 }
 
 /*!
@@ -155,10 +158,16 @@ void QQuickRangeModelPrivate::emitValueAndPositionIfChanged(const qreal oldValue
     // unchanged. This will be the case when operating with values outside range:
     const qreal newValue = q->value();
     const qreal newPosition = q->position();
-    if (!qFuzzyCompare(newValue, oldValue))
-        emit q->valueChanged(newValue);
-    if (!qFuzzyCompare(newPosition, oldPosition))
-        emit q->positionChanged(newPosition);
+
+    if (isComplete) {
+        if (!qFuzzyCompare(newValue, oldValue))
+            emit q->valueChanged(newValue);
+        if (!qFuzzyCompare(newPosition, oldPosition))
+            emit q->positionChanged(newPosition);
+    } else {
+        positionChanged |= qFuzzyCompare(oldPosition, newPosition);
+        valueChanged |= !qFuzzyCompare(oldValue, newValue);
+    }
 }
 
 /*!
@@ -346,6 +355,22 @@ qreal QQuickRangeModel::positionForValue(qreal value) const
     return d->publicPosition(unconstrainedPosition);
 }
 
+void QQuickRangeModel::classBegin()
+{
+}
+
+void QQuickRangeModel::componentComplete()
+{
+    Q_D(QQuickRangeModel);
+    d->isComplete = true;
+    emit minimumChanged(minimum());
+    emit maximumChanged(maximum());
+    if (d->valueChanged)
+        emit valueChanged(value());
+    if (d->positionChanged)
+        emit positionChanged(position());
+}
+
 /*!
     \property QQuickRangeModel::position
     \brief the current position of the model
diff --git a/src/controls/Private/qquickrangemodel_p.h b/src/controls/Private/qquickrangemodel_p.h
index 06d00202..47376ded 100644
--- a/src/controls/Private/qquickrangemodel_p.h
+++ b/src/controls/Private/qquickrangemodel_p.h
@@ -44,7 +44,7 @@ QT_BEGIN_NAMESPACE
 
 class QQuickRangeModelPrivate;
 
-class QQuickRangeModel : public QObject
+class QQuickRangeModel : public QObject, public QQmlParserStatus
 {
     Q_OBJECT
     Q_PROPERTY(qreal value READ value WRITE setValue NOTIFY valueChanged USER true)
@@ -56,6 +56,8 @@ class QQuickRangeModel : public QObject
     Q_PROPERTY(qreal positionAtMaximum READ positionAtMaximum WRITE setPositionAtMaximum NOTIFY positionAtMaximumChanged)
     Q_PROPERTY(bool inverted READ inverted WRITE setInverted NOTIFY invertedChanged)
 
+    Q_INTERFACES(QQmlParserStatus)
+
 public:
     QQuickRangeModel(QObject *parent = 0);
     virtual ~QQuickRangeModel();
@@ -87,6 +89,9 @@ public:
     Q_INVOKABLE qreal valueForPosition(qreal position) const;
     Q_INVOKABLE qreal positionForValue(qreal value) const;
 
+    void classBegin();
+    void componentComplete();
+
 public Q_SLOTS:
     void toMinimum();
     void toMaximum();
diff --git a/src/controls/Private/qquickrangemodel_p_p.h b/src/controls/Private/qquickrangemodel_p_p.h
index 235ba069..6097ff3d 100644
--- a/src/controls/Private/qquickrangemodel_p_p.h
+++ b/src/controls/Private/qquickrangemodel_p_p.h
@@ -67,6 +67,9 @@ public:
     uint inverted : 1;
 
     QQuickRangeModel *q_ptr;
+    bool isComplete;
+    bool positionChanged;
+    bool valueChanged;
 
     inline qreal effectivePosAtMin() const {
         return inverted ? posatmax : posatmin;