Default: cleanup the internal ID from BusyIndicator

An internal ID in the OpacityAnimator element prevented deferred
execution for the whole content item. Apply the same visibility trick
in C++ to avoid having to use an ID in QML.

Task-number: QTBUG-65341
Change-Id: Icb20e4ecc60d1093e849737799bb269f7f03097a
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

3 files changed, 28 insertions, 4 deletions

diff --git a/src/imports/controls/BusyIndicator.qml b/src/imports/controls/BusyIndicator.qml
index 234c2e01..c92ef720 100644
--- a/src/imports/controls/BusyIndicator.qml
+++ b/src/imports/controls/BusyIndicator.qml
@@ -51,8 +51,8 @@ T.BusyIndicator {
         implicitWidth: 48
         implicitHeight: 48
 
+        running: control.running
         opacity: control.running ? 1 : 0
-        visible: control.running || animator.running
-        Behavior on opacity { OpacityAnimator { id: animator; duration: 250 } }
+        Behavior on opacity { OpacityAnimator { duration: 250 } }
     }
 }
diff --git a/src/imports/controls/qquickdefaultbusyindicator.cpp b/src/imports/controls/qquickdefaultbusyindicator.cpp
index 315b2b8b..526eb29f 100644
--- a/src/imports/controls/qquickdefaultbusyindicator.cpp
+++ b/src/imports/controls/qquickdefaultbusyindicator.cpp
@@ -136,6 +136,17 @@ QQuickDefaultBusyIndicator::QQuickDefaultBusyIndicator(QQuickItem *parent) :
     setFlag(ItemHasContents);
 }
 
+bool QQuickDefaultBusyIndicator::isRunning() const
+{
+    return isVisible();
+}
+
+void QQuickDefaultBusyIndicator::setRunning(bool running)
+{
+    if (running)
+        setVisible(true);
+}
+
 int QQuickDefaultBusyIndicator::elapsed() const
 {
     return m_elapsed;
@@ -144,14 +155,23 @@ int QQuickDefaultBusyIndicator::elapsed() const
 void QQuickDefaultBusyIndicator::itemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData &data)
 {
     QQuickItem::itemChange(change, data);
-    if (change == ItemVisibleHasChanged)
+    switch (change) {
+    case ItemOpacityHasChanged:
+        if (qFuzzyIsNull(data.realValue))
+            setVisible(false);
+        break;
+    case ItemVisibleHasChanged:
         update();
+        break;
+    default:
+        break;
+    }
 }
 
 QSGNode *QQuickDefaultBusyIndicator::updatePaintNode(QSGNode *oldNode, QQuickItem::UpdatePaintNodeData *)
 {
     QQuickDefaultBusyIndicatorNode *node = static_cast<QQuickDefaultBusyIndicatorNode *>(oldNode);
-    if (isVisible() && width() > 0 && height() > 0) {
+    if (isRunning() && width() > 0 && height() > 0) {
         if (!node) {
             node = new QQuickDefaultBusyIndicatorNode(this);
             node->start();
diff --git a/src/imports/controls/qquickdefaultbusyindicator_p.h b/src/imports/controls/qquickdefaultbusyindicator_p.h
index 7daeabd1..21a706e7 100644
--- a/src/imports/controls/qquickdefaultbusyindicator_p.h
+++ b/src/imports/controls/qquickdefaultbusyindicator_p.h
@@ -55,10 +55,14 @@ QT_BEGIN_NAMESPACE
 class QQuickDefaultBusyIndicator : public QQuickItem
 {
     Q_OBJECT
+    Q_PROPERTY(bool running READ isRunning WRITE setRunning)
 
 public:
     explicit QQuickDefaultBusyIndicator(QQuickItem *parent = nullptr);
 
+    bool isRunning() const;
+    void setRunning(bool running);
+
     int elapsed() const;
 
 protected: