Disallow clearing all draw flags

Task-number: QTRD-2907

Change-Id: I89a45971bf67c533ecfe477cd685812c46574dd8
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@digia.com>

2 files changed, 32 insertions, 8 deletions

diff --git a/examples/datavisualization/qmlsurface/qml/qmlsurface/main.qml b/examples/datavisualization/qmlsurface/qml/qmlsurface/main.qml
index c38c3146..f11d15f3 100644
--- a/examples/datavisualization/qmlsurface/qml/qmlsurface/main.qml
+++ b/examples/datavisualization/qmlsurface/qml/qmlsurface/main.qml
@@ -97,6 +97,8 @@ Rectangle {
                 onFlatShadingSupportedChanged: {
                     flatShadingToggle.text = "Flat not supported"
                 }
+
+                onDrawModeChanged: checkState()
             }
             //! [4]
             Surface3DSeries {
@@ -113,6 +115,8 @@ Rectangle {
                     minXValue: 67
                     maxXValue: 97
                 }
+
+                onDrawModeChanged: checkState()
             }
             //! [4]
         }
@@ -135,11 +139,9 @@ Rectangle {
                 if (surfaceSeries.drawMode & Surface3DSeries.DrawWireframe) {
                     surfaceSeries.drawMode &= ~Surface3DSeries.DrawWireframe;
                     heightSeries.drawMode &= ~Surface3DSeries.DrawWireframe;
-                    text = "Show Surface Grid"
                 } else {
                     surfaceSeries.drawMode |= Surface3DSeries.DrawWireframe;
                     heightSeries.drawMode |= Surface3DSeries.DrawWireframe;
-                    text = "Hide Surface Grid"
                 }
             }
             //! [1]
@@ -155,11 +157,9 @@ Rectangle {
                 if (surfaceSeries.drawMode & Surface3DSeries.DrawSurface) {
                     surfaceSeries.drawMode &= ~Surface3DSeries.DrawSurface;
                     heightSeries.drawMode &= ~Surface3DSeries.DrawSurface;
-                    text = "Show Surface"
                 } else {
                     surfaceSeries.drawMode |= Surface3DSeries.DrawSurface;
                     heightSeries.drawMode |= Surface3DSeries.DrawSurface;
-                    text = "Hide Surface"
                 }
             }
             //! [8]
@@ -242,4 +242,16 @@ Rectangle {
             //! [3]
         }
     }
+
+    function checkState() {
+        if (surfaceSeries.drawMode & Surface3DSeries.DrawSurface)
+            surfaceToggle.text = "Hide Surface"
+        else
+            surfaceToggle.text = "Show Surface"
+
+        if (surfaceSeries.drawMode & Surface3DSeries.DrawWireframe)
+            surfaceGridToggle.text = "Hide Surface Grid"
+        else
+            surfaceGridToggle.text = "Show Surface Grid"
+    }
 }
diff --git a/src/datavisualization/data/qsurface3dseries.cpp b/src/datavisualization/data/qsurface3dseries.cpp
index 9518b0c4..c5ac9fe8 100644
--- a/src/datavisualization/data/qsurface3dseries.cpp
+++ b/src/datavisualization/data/qsurface3dseries.cpp
@@ -140,6 +140,13 @@ QT_BEGIN_NAMESPACE_DATAVISUALIZATION
  */
 
 /*!
+ * \qmlproperty DrawFlag Surface3DSeries::drawMode
+ *
+ * Sets the drawing \a mode to one of \l{QSurface3DSeries::DrawFlag}{Surface3DSeries.DrawFlag}.
+ * Clearing all flags is not allowed.
+ */
+
+/*!
  * \enum QSurface3DSeries::DrawFlag
  *
  * Drawing mode of the surface. Values of this enumeration can be combined with OR operator.
@@ -283,7 +290,7 @@ bool QSurface3DSeries::isFlatShadingSupported() const
 /*!
  * \property QSurface3DSeries::drawMode
  *
- * Sets the drawing \a mode to one of DrawFlag.
+ * Sets the drawing \a mode to one of DrawFlag. Clearing all flags is not allowed.
  */
 void QSurface3DSeries::setDrawMode(DrawFlags mode)
 {
@@ -389,9 +396,14 @@ void QSurface3DSeriesPrivate::setFlatShadingEnabled(bool enabled)
 
 void QSurface3DSeriesPrivate::setDrawMode(QSurface3DSeries::DrawFlags mode)
 {
-    m_drawMode = mode;
-    if (m_controller)
-        m_controller->markSeriesVisualsDirty();
+    if (mode.testFlag(QSurface3DSeries::DrawWireframe)
+            || mode.testFlag(QSurface3DSeries::DrawSurface)) {
+        m_drawMode = mode;
+        if (m_controller)
+            m_controller->markSeriesVisualsDirty();
+    } else {
+        qWarning("You may not clear all draw flags. Mode not changed.");
+    }
 }
 
 QT_END_NAMESPACE_DATAVISUALIZATION