Only return -1,0,1 from wxXmlResource::CompareVersion().

[wxWidgets.git] / include / wx / private / textmeasure.h

diff --git a/include/wx/private/textmeasure.h b/include/wx/private/textmeasure.h
index d7986c1589816c016dabf450e289dc5c8af12284..393946e7bf476453e280045f234321f409853c5c 100644 (file)
--- a/include/wx/private/textmeasure.h
+++ b/include/wx/private/textmeasure.h
@@ -3,6 +3,7 @@
 // Purpose:     declaration of wxTextMeasure class
 // Author:      Manuel Martin
 // Created:     2012-10-05
+// RCS-ID:      $Id:
 // Copyright:   (c) 1997-2012 wxWidgets team
 // Licence:     wxWindows licence
 ///////////////////////////////////////////////////////////////////////////////
@@ -10,8 +11,6 @@
 #ifndef _WX_PRIVATE_TEXTMEASURE_H_
 #define _WX_PRIVATE_TEXTMEASURE_H_
 
-#include "wx/vector.h"
-
 class WXDLLIMPEXP_FWD_CORE wxDC;
 class WXDLLIMPEXP_FWD_CORE wxFont;
 class WXDLLIMPEXP_FWD_CORE wxWindow;
@@ -24,7 +23,8 @@ class wxTextMeasureBase
 {
 public:
     // The first ctor argument must be non-NULL, i.e. each object of this class
-    // is associated with either a valid wxDC or a valid wxWindow.
+    // is associated with either a valid wxDC or a valid wxWindow. The font can
+    // be NULL to use the current DC/window font or can be specified explicitly.
     wxTextMeasureBase(const wxDC *dc, const wxFont *theFont);
     wxTextMeasureBase(const wxWindow *win, const wxFont *theFont);
 
@@ -47,9 +47,11 @@ public:
                                 wxCoord *heightOneLine = NULL);
 
     // Find the dimensions of the largest string.
-    void GetLargestStringExtent(const wxVector<wxString>& strings,
-                                wxCoord *width,
-                                wxCoord *height);
+    wxSize GetLargestStringExtent(size_t n, const wxString* strings);
+    wxSize GetLargestStringExtent(const wxArrayString& strings)
+    {
+        return GetLargestStringExtent(strings.size(), &strings[0]);
+    }
 
     // Fill the array with the widths for each "0..N" substrings for N from 1
     // to text.length().
@@ -60,30 +62,39 @@ public:
                                wxArrayInt& widths,
                                double scaleX);
 
-protected:
+
     // These functions are called by our public methods before and after each
     // call to DoGetTextExtent(). Derived classes may override them to prepare
     // for -- possibly several -- subsequent calls to DoGetTextExtent().
     //
     // As these calls must be always paired, they're never called directly but
     // only by our friend MeasuringGuard class.
+    //
+    // NB: They're public only to allow VC6 to compile this code, there doesn't
+    //     seem to be any way to give MeasuringGuard access to them (FIXME-VC6)
     virtual void BeginMeasuring() { }
     virtual void EndMeasuring() { }
 
-    friend class MeasuringGuard;
+    // This is another method which is only used by MeasuringGuard.
+    bool IsUsingDCImpl() const { return m_useDCImpl; }
 
+protected:
     // RAII wrapper for the two methods above.
     class MeasuringGuard
     {
     public:
         MeasuringGuard(wxTextMeasureBase& tm) : m_tm(tm)
         {
-            m_tm.BeginMeasuring();
+            // BeginMeasuring() should only be called if we have a native DC,
+            // so don't call it if we delegate to a DC of unknown type.
+            if ( !m_tm.IsUsingDCImpl() )
+                m_tm.BeginMeasuring();
         }
 
         ~MeasuringGuard()
         {
-            m_tm.EndMeasuring();
+            if ( !m_tm.IsUsingDCImpl() )
+                m_tm.EndMeasuring();
         }
 
     private:
@@ -92,7 +103,7 @@ protected:
 
 
     // The main function of this class, to be implemented in platform-specific
-    // way used by all our public methods except GetLargestStringExtents().
+    // way used by all our public methods.
     //
     // The width and height pointers here are never NULL and the input string
     // is not empty.
@@ -110,12 +121,36 @@ protected:
                                          wxArrayInt& widths,
                                          double scaleX) = 0;
 
+    // Call either DoGetTextExtent() or wxDC::GetTextExtent() depending on the
+    // value of m_useDCImpl.
+    //
+    // This must be always used instead of calling DoGetTextExtent() directly!
+    void CallGetTextExtent(const wxString& string,
+                           wxCoord *width,
+                           wxCoord *height,
+                           wxCoord *descent = NULL,
+                           wxCoord *externalLeading = NULL);
+
+    // Return a valid font: if one was given to us in the ctor, use this one,
+    // otherwise use the current font of the associated wxDC or wxWindow.
+    wxFont GetFont() const;
+
 
     // Exactly one of m_dc and m_win is non-NULL for any given object of this
     // class.
     const wxDC* const m_dc;
     const wxWindow* const m_win;
 
+    // If this is true, simply forward to wxDC::GetTextExtent() from our
+    // CallGetTextExtent() instead of calling our own DoGetTextExtent().
+    //
+    // We need this because our DoGetTextExtent() typically only works with
+    // native DCs, i.e. those having an HDC under Windows or using Pango under
+    // GTK+. However wxTextMeasure object can be constructed for any wxDC, not
+    // necessarily a native one and in this case we must call back into the DC
+    // implementation of text measuring itself.
+    bool m_useDCImpl;
+
     // This one can be NULL or not.
     const wxFont* const m_font;