Rename wxBoxSizer::m_minSize to avoid clash with the base class

wxSizer already has m_minSize field, use m_calculatedMinSize for the field of
the derived wxBoxSizer class to avoid confusion, just as wxFlexGridSizer
already did.

Also add a new unit test checking that GetMinSize() still works after this
change.

include/wx/sizer.h

@@ -1016,7 +1016,7 @@ protected:
 
     // the minimal size needed for this sizer as calculated by the last call to
     // our CalcMin()
-    wxSize m_minSize;
+    wxSize m_calculatedMinSize;
 
 private:
     wxDECLARE_CLASS(wxBoxSizer);

src/common/sizer.cpp

@@ -2179,7 +2179,7 @@ void wxBoxSizer::RecalcSizes()
 
     // the amount of free space which we should redistribute among the
     // stretchable items (i.e. those with non zero proportion)
-    int delta = totalMajorSize - GetSizeInMajorDir(m_minSize);
+    int delta = totalMajorSize - GetSizeInMajorDir(m_calculatedMinSize);
 
     // declare loop variables used below:
     wxSizerItemList::const_iterator i;  // iterator in m_children list
@@ -2498,7 +2498,7 @@ void wxBoxSizer::RecalcSizes()
 wxSize wxBoxSizer::CalcMin()
 {
     m_totalProportion = 0;
-    m_minSize = wxSize(0, 0);
+    m_calculatedMinSize = wxSize(0, 0);
 
     // The minimal size for the sizer should be big enough to allocate its
     // element at least its minimal size but also, and this is the non trivial
@@ -2529,19 +2529,19 @@ wxSize wxBoxSizer::CalcMin()
         else // fixed size item
         {
             // Just account for its size directly
-            SizeInMajorDir(m_minSize) += GetSizeInMajorDir(sizeMinThis);
+            SizeInMajorDir(m_calculatedMinSize) += GetSizeInMajorDir(sizeMinThis);
         }
 
         // In the transversal direction we just need to find the maximum.
-        if ( GetSizeInMinorDir(sizeMinThis) > GetSizeInMinorDir(m_minSize) )
-            SizeInMinorDir(m_minSize) = GetSizeInMinorDir(sizeMinThis);
+        if ( GetSizeInMinorDir(sizeMinThis) > GetSizeInMinorDir(m_calculatedMinSize) )
+            SizeInMinorDir(m_calculatedMinSize) = GetSizeInMinorDir(sizeMinThis);
     }
 
     // Using the max ratio ensures that the min size is big enough for all
     // items to have their min size and satisfy the proportions among them.
-    SizeInMajorDir(m_minSize) += (int)(maxMinSizeToProp*m_totalProportion);
+    SizeInMajorDir(m_calculatedMinSize) += (int)(maxMinSizeToProp*m_totalProportion);
 
-    return m_minSize;
+    return m_calculatedMinSize;
 }
 
 //---------------------------------------------------------------------------

src/common/wrapsizer.cpp

@@ -141,8 +141,8 @@ bool wxWrapSizer::InformFirstDirection(int direction,
     // Store the values for later use
     m_availSize = size;
     m_availableOtherDir = availableOtherDir +
-                            (direction == wxHORIZONTAL ? m_minSize.y
-                                                       : m_minSize.x);
+                            (direction == wxHORIZONTAL ? m_calculatedMinSize.y
+                                                       : m_calculatedMinSize.x);
     m_dirInform = direction;
     m_lastUsed = false;
     return true;
@@ -208,7 +208,7 @@ wxSize wxWrapSizer::CalcMin()
         }
     }
 
-    return m_minSize;
+    return m_calculatedMinSize;
 }
 
 void wxWrapSizer::CalcMinFittingSize(const wxSize& szBoundary)
@@ -220,7 +220,7 @@ void wxWrapSizer::CalcMinFittingSize(const wxSize& szBoundary)
     if ( m_minSizeMinor < SizeInMinorDir(m_size) &&
             m_maxSizeMajor < SizeInMajorDir(m_size) )
     {
-        m_minSize = sizeMin;
+        m_calculatedMinSize = sizeMin;
     }
     else
     {
@@ -231,9 +231,9 @@ void wxWrapSizer::CalcMinFittingSize(const wxSize& szBoundary)
             // We try to present a lower min value by removing an item in
             // the major direction (and preserving current minor min size).
             CalcMinFromMajor(m_maxSizeMajor - m_minItemMajor);
-            if ( m_minSize.x <= szBoundary.x && m_minSize.y <= szBoundary.y )
+            if ( m_calculatedMinSize.x <= szBoundary.x && m_calculatedMinSize.y <= szBoundary.y )
             {
-                SizeInMinorDir(m_minSize) = SizeInMinorDir(sizeMin);
+                SizeInMinorDir(m_calculatedMinSize) = SizeInMinorDir(sizeMin);
                 done = true;
             }
         }
@@ -241,7 +241,7 @@ void wxWrapSizer::CalcMinFittingSize(const wxSize& szBoundary)
         if ( !done )
         {
             // If failed finding little smaller area, go back to what we had
-            m_minSize = sizeMin;
+            m_calculatedMinSize = sizeMin;
         }
     }
 }
@@ -269,7 +269,7 @@ void wxWrapSizer::CalcMaxSingleItemSize()
     // This is, of course, not our real minimal size but if we return more
     // than this it would be impossible to shrink us to one row/column so
     // we have to pretend that this is all we need for now.
-    m_minSize = SizeFromMajorMinor(maxMajor, maxMinor);
+    m_calculatedMinSize = SizeFromMajorMinor(maxMajor, maxMinor);
 }
 
 void wxWrapSizer::CalcMinFromMajor(int totMajor)
@@ -325,7 +325,7 @@ void wxWrapSizer::CalcMinFromMajor(int totMajor)
     if ( rowTotalMajor > maxTotalMajor )
         maxTotalMajor = rowTotalMajor;
 
-    m_minSize = SizeFromMajorMinor(maxTotalMajor, minorSum);
+    m_calculatedMinSize = SizeFromMajorMinor(maxTotalMajor, minorSum);
 }
 
 // Helper struct for CalcMinFromMinor
@@ -370,7 +370,7 @@ void wxWrapSizer::CalcMinFromMinor(int totMinor)
     // The trivial case
     if ( !itemCount || totMajor==0 || maxMinor==0 )
     {
-        m_minSize = wxSize(0,0);
+        m_calculatedMinSize = wxSize(0,0);
         return;
     }
 
@@ -379,7 +379,7 @@ void wxWrapSizer::CalcMinFromMinor(int totMinor)
     if ( nrLines<=1 )
     {
         // Another simple case, everything fits on one line
-        m_minSize = SizeFromMajorMinor(totMajor,maxMinor);
+        m_calculatedMinSize = SizeFromMajorMinor(totMajor,maxMinor);
         return;
     }
 
@@ -469,7 +469,7 @@ void wxWrapSizer::CalcMinFromMinor(int totMinor)
     }
 
     // Now have min size in the opposite direction
-    m_minSize = SizeFromMajorMinor(lineSize,sumMinor);
+    m_calculatedMinSize = SizeFromMajorMinor(lineSize,sumMinor);
 }
 
 void wxWrapSizer::FinishRow(size_t n,

tests/sizers/boxsizer.cpp

@@ -41,6 +41,7 @@ private:
         CPPUNIT_TEST( Size1 );
         CPPUNIT_TEST( Size3 );
         CPPUNIT_TEST( CalcMin );
+        CPPUNIT_TEST( SetMinSize );
         CPPUNIT_TEST( BestSizeRespectsMaxSize );
         CPPUNIT_TEST( RecalcSizesRespectsMaxSize1 );
         CPPUNIT_TEST( RecalcSizesRespectsMaxSize2 );
@@ -50,6 +51,7 @@ private:
     void Size1();
     void Size3();
     void CalcMin();
+    void SetMinSize();
     void BestSizeRespectsMaxSize();
     void RecalcSizesRespectsMaxSize1();
     void RecalcSizesRespectsMaxSize2();
@@ -307,6 +309,21 @@ void BoxSizerTestCase::CalcMin()
     }
 }
 
+void BoxSizerTestCase::SetMinSize()
+{
+    wxWindow* const child = new wxWindow(m_win, wxID_ANY);
+    child->SetInitialSize(wxSize(10, -1));
+    m_sizer->Add(child);
+
+    // Setting minimal size explicitly must make GetMinSize() return at least
+    // this size even if it needs a much smaller one.
+    m_sizer->SetMinSize(100, 0);
+    CPPUNIT_ASSERT_EQUAL( 100, m_sizer->GetMinSize().x );
+
+    m_sizer->Layout();
+    CPPUNIT_ASSERT_EQUAL( 100, m_sizer->GetMinSize().x );
+}
+
 void BoxSizerTestCase::BestSizeRespectsMaxSize()
 {
     m_sizer->Clear();