added and documented wxSize::IsFullySpecified() and SetDefaults()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@26614 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/latex/wx/size.tex

@@ -26,6 +26,7 @@ None
 
 \latexignore{\rtfignore{\wxheading{Members}}}
 
+
 \membersection{wxSize::wxSize}
 
 \func{}{wxSize}{\void}
@@ -35,6 +36,7 @@ None
 Creates a size object.
 
 
+
 \membersection{wxSize::DecTo}\label{wxsizedecto}
 
 \func{wxSize\&}{DecTo}{\param{const wxSize\& }{size}}
@@ -47,12 +49,25 @@ corresponding dimensions of the \arg{size}.
 \helpref{IncTo}{wxsizeincto}
 
 
+\membersection{wxSize::IsFullySpecified}\label{wxsizeisfullyspecified}
+
+\constfunc{IsFullySpecified}{\void}
+
+Returns \true if neither of the size object components is equal to $-1$, which
+is used as default for the size values in wxWindows (hence the predefined 
+\texttt{wxDefaultSize} has both of its components equal to $-1$).
+
+This method is typically used before calling 
+\helpref{SetDefaults}{wxsizesetdefaults}.
+
+
 \membersection{wxSize::GetWidth}\label{wxsizegetwidth}
 
 \constfunc{int}{GetWidth}{\void}
 
 Gets the width member.
 
+
 \membersection{wxSize::GetHeight}\label{wxsizegetheight}
 
 \constfunc{int}{GetHeight}{\void}
@@ -60,6 +75,7 @@ Gets the width member.
 Gets the height member.
 
 
+
 \membersection{wxSize::IncTo}\label{wxsizeincto}
 
 \func{wxSize\&}{IncTo}{\param{const wxSize\& }{size}}
@@ -72,24 +88,47 @@ corresponding dimensions of the \arg{size}.
 \helpref{DecTo}{wxsizedecto}
 
 
+
 \membersection{wxSize::Set}\label{wxsizeset}
 
 \func{void}{Set}{\param{int}{ width}, \param{int}{ height}}
 
 Sets the width and height members.
 
+
+\membersection{wxSize::SetDefaults}\label{wxsizesetdefaults}
+
+\func{void}{SetDefaults}{\param{const wxSize\& }{sizeDefault}}
+
+Combine this size object with another one replacing the default (i.e. equal
+to $-1$) components of this object with those of the other. It is typically
+used like this:
+\begin{verbatim}
+    if ( !size.IsFullySpecified() )
+    {
+        size.SetDefaults(GetDefaultSize());
+    }
+\end{verbatim}
+
+\wxheading{See also}
+
+\helpref{IsFullySpecified}{wxsizeisfullyspecified}
+
+
 \membersection{wxSize::SetHeight}\label{wxsizesetheight}
 
 \func{void}{SetHeight}{\param{int}{ height}}
 
 Sets the height.
 
+
 \membersection{wxSize::SetWidth}\label{wxsizesetwidth}
 
 \func{void}{SetWidth}{\param{int}{ width}}
 
 Sets the width.
 
+
 \membersection{wxSize::operator $=$}
 
 \func{void}{operator $=$}{\param{const wxSize\& }{sz}}

include/wx/gdicmn.h

@@ -116,7 +116,7 @@ enum wxStockCursor
     wxCURSOR_DEFAULT, // standard X11 cursor
 #endif
 #ifdef __WXMAC__
-	wxCURSOR_COPY_ARROW , // MacOS Theme Plus arrow 
+	wxCURSOR_COPY_ARROW , // MacOS Theme Plus arrow
 #endif
 #ifdef __X__
     // Not yet implemented for Windows
@@ -214,7 +214,7 @@ public:
     // FIXME are these really useful? If they're, we should have += &c as well
     wxSize operator+(const wxSize& sz) { return wxSize(x + sz.x, y + sz.y); }
     wxSize operator-(const wxSize& sz) { return wxSize(x - sz.x, y - sz.y); }
-    
+
     void IncTo(const wxSize& sz)
         { if ( sz.x > x ) x = sz.x; if ( sz.y > y ) y = sz.y; }
     void DecTo(const wxSize& sz)
@@ -228,6 +228,18 @@ public:
     int GetWidth() const { return x; }
     int GetHeight() const { return y; }
 
+    bool IsFullySpecified() const { return x != -1 && y != -1; }
+
+    // combine this size with the other one replacing the default (i.e. equal
+    // to -1) components of this object with those of the other
+    void SetDefaults(const wxSize& size)
+    {
+        if ( x == -1 )
+            x = size.x;
+        if ( y == -1 )
+            y = size.y;
+    }
+
     // compatibility
     int GetX() const { return x; }
     int GetY() const { return y; }