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Implement GetPartialTextExtents() in wxGtkPrinterDC

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Generic implementation from wxDCImpl doesn't work well with wxPrinterDC
under wxGTK.
(This implementation is adopted from wxCairoContext::GetPartialTextExtents.)
This commit is contained in:
Artur Wieczorek 2017-05-25 23:47:29 +02:00
parent 528c559953
commit ef3863a71e
2 changed files with 33 additions and 0 deletions
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1
include/wx/gtk/print.h
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@ -291,6 +291,7 @@ protected:
wxCoord *descent = NULL,
wxCoord *externalLeading = NULL,
const wxFont *theFont = NULL ) const wxOVERRIDE;
bool DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const wxOVERRIDE;
void DoGetSize(int* width, int* height) const wxOVERRIDE;
void DoGetSizeMM(int *width, int *height) const wxOVERRIDE;

32
src/gtk/print.cpp
View File

@ -2250,6 +2250,38 @@ void wxGtkPrinterDCImpl::DoGetTextExtent(const wxString& string, wxCoord *width,
cairo_restore( m_cairo );
}
bool wxGtkPrinterDCImpl::DoGetPartialTextExtents(const wxString& text, wxArrayInt& widths) const
{
widths.Empty();
const wxCharBuffer data = text.utf8_str();
int w = 0;
if ( data.length() > 0 )
{
cairo_save(m_cairo);
cairo_scale(m_cairo, m_scaleX, m_scaleY);
pango_layout_set_text(m_layout, data, data.length());
PangoLayoutIter* iter = pango_layout_get_iter(m_layout);
do
{
PangoRectangle rect;
pango_layout_iter_get_cluster_extents(iter, NULL, &rect);
w += rect.width;
widths.Add(PANGO_PIXELS(w));
} while (pango_layout_iter_next_cluster(iter));
pango_layout_iter_free(iter);
cairo_restore(m_cairo);
}
size_t i = widths.GetCount();
const size_t len = text.length();
while (i++ < len)
widths.Add(PANGO_PIXELS(w));
return true;
}
void wxGtkPrinterDCImpl::DoGetSize(int* width, int* height) const
{
GtkPageSetup *setup = gtk_print_context_get_page_setup( m_gpc );