// Purpose: wxTextMeasureBase implementation
// Author: Manuel Martin
// Created: 2012-10-05
-// RCS-ID: $Id:
// Copyright: (c) 1997-2012 wxWidgets team
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
m_font(theFont)
{
wxASSERT_MSG( dc, wxS("wxTextMeasure needs a valid wxDC") );
+
+ // By default, use wxDC version, we'll explicitly reset this to false in
+ // the derived classes if the DC is of native variety.
+ m_useDCImpl = true;
}
wxTextMeasureBase::wxTextMeasureBase(const wxWindow *win, const wxFont *theFont)
m_font(theFont)
{
wxASSERT_MSG( win, wxS("wxTextMeasure needs a valid wxWindow") );
+
+ // We don't have any wxDC so we can't forward to it.
+ m_useDCImpl = false;
+}
+
+wxFont wxTextMeasureBase::GetFont() const
+{
+ return m_font ? *m_font
+ : m_win ? m_win->GetFont()
+ : m_dc->GetFont();
+}
+
+void wxTextMeasureBase::CallGetTextExtent(const wxString& string,
+ wxCoord *width,
+ wxCoord *height,
+ wxCoord *descent,
+ wxCoord *externalLeading)
+{
+ if ( m_useDCImpl )
+ m_dc->GetTextExtent(string, width, height, descent, externalLeading);
+ else
+ DoGetTextExtent(string, width, height, descent, externalLeading);
}
void wxTextMeasureBase::GetTextExtent(const wxString& string,
if ( !height )
height = &unusedHeight;
- if ( string.empty() )
+ // Avoid even setting up the DC for measuring if we don't actually need to
+ // measure anything.
+ if ( string.empty() && !descent && !externalLeading )
{
*width =
*height = 0;
MeasuringGuard guard(*this);
- DoGetTextExtent(string, width, height, descent, externalLeading);
+ CallGetTextExtent(string, width, height, descent, externalLeading);
}
void wxTextMeasureBase::GetMultiLineTextExtent(const wxString& text,
{
// but we don't know it yet - choose something reasonable
int dummy;
- DoGetTextExtent(wxS("W"), &dummy, &heightLineDefault);
+ CallGetTextExtent(wxS("W"), &dummy, &heightLineDefault);
}
heightTextTotal += heightLineDefault;
}
else
{
- DoGetTextExtent(curLine, &widthLine, &heightLine);
+ CallGetTextExtent(curLine, &widthLine, &heightLine);
if ( widthLine > widthTextMax )
widthTextMax = widthLine;
heightTextTotal += heightLine;
*heightOneLine = heightLine;
}
-void wxTextMeasureBase::GetLargestStringExtent(const wxVector<wxString>& strings,
- wxCoord *width,
- wxCoord *height)
+wxSize wxTextMeasureBase::GetLargestStringExtent(size_t n,
+ const wxString* strings)
{
MeasuringGuard guard(*this);
wxCoord w, h, widthMax = 0, heightMax = 0;
- for ( wxVector<wxString>::const_iterator i = strings.begin();
- i != strings.end();
- ++i )
+ for ( size_t i = 0; i < n; ++i )
{
- DoGetTextExtent(*i, &w, &h);
+ CallGetTextExtent(strings[i], &w, &h);
if ( w > widthMax )
widthMax = w;
heightMax = h;
}
- if ( width )
- *width = widthMax;
- if ( height )
- *height = heightMax;
+ return wxSize(widthMax, heightMax);
}
bool wxTextMeasureBase::GetPartialTextExtents(const wxString& text,
return DoGetPartialTextExtents(text, widths, scaleX);
}
+
+// ----------------------------------------------------------------------------
+// Generic and inefficient DoGetPartialTextExtents() implementation.
+// ----------------------------------------------------------------------------
+
+// Each element of the widths array will be the width of the string up to and
+// including the corresponding character in text. This is the generic
+// implementation, the port-specific classes should do this with native APIs
+// if available and if faster. Note: pango_layout_index_to_pos is much slower
+// than calling GetTextExtent!!
+
+#define FWC_SIZE 256
+
+class FontWidthCache
+{
+public:
+ FontWidthCache() : m_scaleX(1), m_widths(NULL) { }
+ ~FontWidthCache() { delete []m_widths; }
+
+ void Reset()
+ {
+ if ( !m_widths )
+ m_widths = new int[FWC_SIZE];
+
+ memset(m_widths, 0, sizeof(int)*FWC_SIZE);
+ }
+
+ wxFont m_font;
+ double m_scaleX;
+ int *m_widths;
+};
+
+static FontWidthCache s_fontWidthCache;
+
+bool wxTextMeasureBase::DoGetPartialTextExtents(const wxString& text,
+ wxArrayInt& widths,
+ double scaleX)
+{
+ int totalWidth = 0;
+
+ // reset the cache if font or horizontal scale have changed
+ if ( !s_fontWidthCache.m_widths ||
+ !wxIsSameDouble(s_fontWidthCache.m_scaleX, scaleX) ||
+ (s_fontWidthCache.m_font != *m_font) )
+ {
+ s_fontWidthCache.Reset();
+ s_fontWidthCache.m_font = *m_font;
+ s_fontWidthCache.m_scaleX = scaleX;
+ }
+
+ // Calculate the position of each character based on the widths of
+ // the previous characters. This is inexact for not fixed fonts.
+ int n = 0;
+ for ( wxString::const_iterator it = text.begin();
+ it != text.end();
+ ++it )
+ {
+ const wxChar c = *it;
+ unsigned int c_int = (unsigned int)c;
+
+ int w;
+ if ((c_int < FWC_SIZE) && (s_fontWidthCache.m_widths[c_int] != 0))
+ {
+ w = s_fontWidthCache.m_widths[c_int];
+ }
+ else
+ {
+ DoGetTextExtent(c, &w, NULL);
+ if (c_int < FWC_SIZE)
+ s_fontWidthCache.m_widths[c_int] = w;
+ }
+
+ totalWidth += w;
+ widths[n++] = totalWidth;
+ }
+
+ return true;
+}
+
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