+///////////////////////////////////////////////////////////////////////////////
+// Name: src/gtk/textmeasure.cpp
+// Purpose: wxTextMeasure implementation for wxGTK
+// Author: Manuel Martin
+// Created: 2012-10-05
+// Copyright: (c) 1997-2012 wxWidgets team
+// Licence: wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// for compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifndef WX_PRECOMP
+ #include "wx/window.h"
+#endif //WX_PRECOMP
+
+#include "wx/private/textmeasure.h"
+
+#include "wx/fontutil.h"
+#include "wx/gtk/private.h"
+
+#ifndef __WXGTK3__
+ #include "wx/gtk/dcclient.h"
+#endif
+
+// ============================================================================
+// wxTextMeasure implementation
+// ============================================================================
+
+void wxTextMeasure::Init()
+{
+ wxASSERT_MSG( m_font, wxT("wxTextMeasure needs a valid wxFont") );
+
+#ifndef __WXGTK3__
+ m_wdc = NULL;
+#endif // GTK+ < 3
+ m_context = NULL;
+ m_layout = NULL;
+}
+
+// Get Gtk needed elements, if we have not them yet.
+void wxTextMeasure::BeginMeasuring()
+{
+ if ( m_dc )
+ {
+#ifndef __WXGTK3__
+ m_wdc = wxDynamicCast(m_dc->GetImpl(), wxWindowDCImpl);
+ if ( m_wdc )
+ {
+ m_context = m_wdc->m_context;
+ m_layout = m_wdc->m_layout;
+ }
+#endif // GTK+ < 3
+ }
+ else if ( m_win )
+ {
+ m_context = gtk_widget_get_pango_context( m_win->GetHandle() );
+ if ( m_context )
+ m_layout = pango_layout_new(m_context);
+ }
+
+ // set the font to use
+ if ( m_layout )
+ {
+ pango_layout_set_font_description(m_layout,
+ m_font->GetNativeFontInfo()->description);
+ }
+}
+
+void wxTextMeasure::EndMeasuring()
+{
+ if ( !m_layout )
+ return;
+
+#ifndef __WXGTK3__
+ if ( m_wdc )
+ {
+ // Reset dc own font description
+ pango_layout_set_font_description( m_wdc->m_layout, m_wdc->m_fontdesc );
+ }
+ else
+#endif // GTK+ < 3
+ {
+ g_object_unref (m_layout);
+ }
+}
+
+// Notice we don't check here the font. It is supposed to be OK before the call.
+void wxTextMeasure::DoGetTextExtent(const wxString& string,
+ wxCoord *width,
+ wxCoord *height,
+ wxCoord *descent,
+ wxCoord *externalLeading)
+{
+ if ( !m_context )
+ {
+ *width =
+ *height = 0;
+ return;
+ }
+
+ // Set layout's text
+ const wxCharBuffer dataUTF8 = wxGTK_CONV_FONT(string, *m_font);
+ if ( !dataUTF8 )
+ {
+ // hardly ideal, but what else can we do if conversion failed?
+ wxLogLastError(wxT("GetTextExtent"));
+ return;
+ }
+ pango_layout_set_text(m_layout, dataUTF8, -1);
+
+ if ( m_dc )
+ {
+ // in device units
+ pango_layout_get_pixel_size(m_layout, width, height);
+ }
+ else // win
+ {
+ // the logical rect bounds the ink rect
+ PangoRectangle rect;
+ pango_layout_get_extents(m_layout, NULL, &rect);
+ *width = PANGO_PIXELS(rect.width);
+ *height = PANGO_PIXELS(rect.height);
+ }
+
+ if (descent)
+ {
+ PangoLayoutIter *iter = pango_layout_get_iter(m_layout);
+ int baseline = pango_layout_iter_get_baseline(iter);
+ pango_layout_iter_free(iter);
+ *descent = *height - PANGO_PIXELS(baseline);
+ }
+
+ if (externalLeading)
+ {
+ // No support for MSW-like "external leading" in Pango.
+ *externalLeading = 0;
+ }
+}
+
+bool wxTextMeasure::DoGetPartialTextExtents(const wxString& text,
+ wxArrayInt& widths,
+ double WXUNUSED(scaleX))
+{
+ // Set layout's text
+ const wxCharBuffer dataUTF8 = wxGTK_CONV_FONT(text, *m_font);
+ if ( !dataUTF8 )
+ {
+ // hardly ideal, but what else can we do if conversion failed?
+ wxLogLastError(wxT("GetPartialTextExtents"));
+ return false;
+ }
+
+ pango_layout_set_text(m_layout, dataUTF8, -1);
+
+ // Calculate the position of each character based on the widths of
+ // the previous characters
+
+ // Code borrowed from Scintilla's PlatGTK
+ PangoLayoutIter *iter = pango_layout_get_iter(m_layout);
+ PangoRectangle pos;
+ pango_layout_iter_get_cluster_extents(iter, NULL, &pos);
+ size_t i = 0;
+ while (pango_layout_iter_next_cluster(iter))
+ {
+ pango_layout_iter_get_cluster_extents(iter, NULL, &pos);
+ int position = PANGO_PIXELS(pos.x);
+ widths[i++] = position;
+ }
+
+ const size_t len = text.length();
+ while (i < len)
+ widths[i++] = PANGO_PIXELS(pos.x + pos.width);
+ pango_layout_iter_free(iter);
+
+ return true;
+}
projects / wxWidgets.git / commitdiff
