static void bg(GtkStyleContext* sc, wxColour& color, int state = GTK_STATE_FLAG_NORMAL)
{
GdkRGBA* rgba;
cairo_pattern_t* pattern = NULL;
gtk_style_context_set_state(sc, GtkStateFlags(state));
gtk_style_context_get(sc, GtkStateFlags(state),
"background-color", &rgba, "background-image", &pattern, NULL);
color = wxColour(*rgba);
gdk_rgba_free(rgba);
// "background-image" takes precedence over "background-color".
// If there is an image, try to get a color out of it.
if (pattern)
{
if (cairo_pattern_get_type(pattern) == CAIRO_PATTERN_TYPE_SURFACE)
{
cairo_surface_t* surf;
cairo_pattern_get_surface(pattern, &surf);
if (cairo_surface_get_type(surf) == CAIRO_SURFACE_TYPE_IMAGE)
{
const guchar* data = cairo_image_surface_get_data(surf);
const int stride = cairo_image_surface_get_stride(surf);
// choose a pixel in the middle vertically,
// images often have a vertical gradient
const int i = stride * (cairo_image_surface_get_height(surf) / 2);
const unsigned* p = reinterpret_cast<const unsigned*>(data + i);
const unsigned pixel = *p;
guchar r, g, b, a = 0xff;
switch (cairo_image_surface_get_format(surf))
{
case CAIRO_FORMAT_ARGB32:
a = guchar(pixel >> 24);
// fallthrough
case CAIRO_FORMAT_RGB24:
r = guchar(pixel >> 16);
g = guchar(pixel >> 8);
b = guchar(pixel);
break;
default:
a = 0;
break;
}
if (a != 0)
{
if (a != 0xff)
{
// un-premultiply
r = guchar((r * 0xff) / a);
g = guchar((g * 0xff) / a);
b = guchar((b * 0xff) / a);
}
color.Set(r, g, b, a);
}
}
}
cairo_pattern_destroy(pattern);
}
wxSize wxSpinButton::DoGetBestSize() const
{
wxSize best = base_type::DoGetBestSize();
#ifdef __WXGTK3__
GtkStyleContext* sc = gtk_widget_get_style_context(m_widget);
GtkBorder pad = { 0, 0, 0, 0 };
gtk_style_context_get_padding(sc, GtkStateFlags(0), &pad);
best.x -= pad.left + pad.right;
#else
gtk_widget_ensure_style(m_widget);
int w = PANGO_PIXELS(pango_font_description_get_size(m_widget->style->font_desc));
w &= ~1;
if (w < 6)
w = 6;
best.x = w + 2 * m_widget->style->xthickness;
#endif
CacheBestSize(best);
return best;
}