Factor out text measurement from wxDC and wxWindow into wxTextMeasure.

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

diff --git a/include/wx/gtk/private/textmeasure.h b/include/wx/gtk/private/textmeasure.h
new file mode 100644 (file)
index 0000000..ad9a43c
--- /dev/null
+++ b/include/wx/gtk/private/textmeasure.h
@@ -0,0 +1,65 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/gtk/private/textmeasure.h
+// Purpose:     wxGTK-specific declaration of wxTextMeasure class
+// Author:      Manuel Martin
+// Created:     2012-19-05
+// Copyright:   (c) 1997-2012 wxWidgets team
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_GTK_PRIVATE_TEXTMEASURE_H_
+#define _WX_GTK_PRIVATE_TEXTMEASURE_H_
+
+// ----------------------------------------------------------------------------
+// wxTextMeasure
+// ----------------------------------------------------------------------------
+
+class WXDLLIMPEXP_FWD_CORE wxWindowDCImpl;
+
+class wxTextMeasure : public wxTextMeasureBase
+{
+public:
+    wxTextMeasure(const wxDC *dc, const wxFont *font)
+        : wxTextMeasureBase(dc, font)
+    {
+        Init();
+    }
+
+    wxTextMeasure(const wxWindow *win, const wxFont *font)
+        : wxTextMeasureBase(win, font)
+    {
+        Init();
+    }
+
+protected:
+    // Common part of both ctors.
+    void Init();
+
+    virtual void BeginMeasuring();
+    virtual void EndMeasuring();
+
+    virtual void DoGetTextExtent(const wxString& string,
+                                 wxCoord *width,
+                                 wxCoord *height,
+                                 wxCoord *descent = NULL,
+                                 wxCoord *externalLeading = NULL);
+
+    virtual bool DoGetPartialTextExtents(const wxString& text,
+                                         wxArrayInt& widths,
+                                         double scaleX);
+
+
+    // This class is only used for DC text measuring with GTK+ 2 as GTK+ 3 uses
+    // Cairo and not Pango for this. However it's still used even with GTK+ 3
+    // for window text measuring, so the context and the layout are still
+    // needed.
+#ifndef __WXGTK3__
+    wxWindowDCImpl *m_wdc;
+#endif // GTK+ < 3
+    PangoContext *m_context;
+    PangoLayout *m_layout;
+
+    wxDECLARE_NO_COPY_CLASS(wxTextMeasure);
+};
+
+#endif // _WX_GTK_PRIVATE_TEXTMEASURE_H_