如何在Gtkmm3中使用CssStyleProvider [英] How to use CssStyleProvider in Gtkmm3

问题描述

我正在用c ++编程gtkmm3。我想在我的程序中更改一些字体。我在gtkmm文档中以及gtk + documentaion中阅读了关于CssStyleProvider，StyleContext的所有内容，但是我无法使其工作并找不到任何有关该教程的教程。我想这样

  Glib :: ustring数据; 
 data =GtkMenuBar，GtkMenuItem {font-name：Sans 6}; / *用分号尝试* / 
 Glib :: RefPtr< Gtk :: CssProvider> asd = Gtk :: CssProvider :: create（）; 
 Glib :: RefPtr< Gtk :: StyleContext> asd2 = Gtk :: StyleContext :: create（）; 
 asd-> load_from_data（data）; 
 asd2-> add_provider（asd，0）; / *也尝试了不同的优先事项* / 
  

也是这样尝试的

  Glib :: ustring数据; 
 data =GtkMenuBar，GtkMenuItem {font-name：Sans 6}; / *用分号尝试* / 
 Glib :: RefPtr< Gtk :: CssProvider> asd = Gtk :: CssProvider :: create（）; 
 Glib :: RefPtr< Gdk :: Screen>屏幕; 
 Glib :: RefPtr< Gtk :: StyleContext> asd2 = Gtk :: StyleContext :: create（）; 
 asd-> load_from_data（data）; 
（mainWindow.get（）） - > get_property（screen，screen）; 
 asd2-> add_provider（screen，asd，0）; / *也尝试了不同的优先级* / 
  

在运行主窗口之前，但我没有运气。感谢您的任何帮助。

解决方案

您是否还尝试使用宏GTK_STYLE_PROVIDER_PRIORITY_APPLICATION而不是0？
$ b

  asd2-> add_provider（screen，asd，macro GTK_STYLE_PROVIDER_PRIORITY_APPLICATION）; 
  

适用于我，也适用于Windows。

<例如：

  int main（int argc，char ** argv）{
 
 Main app （argc，argv）; 
 Glib :: ustring data =GtkLabel {color：＃ff00ea; font：Comic Sans MS 12}; 
 auto css = CssProvider :: create（）; 
 if（not css-> load_from_data（data））{
 cerr<< 无法加载css \ n; 
 std :: exit（1）; 
} 
标签标签（test）; 
窗口获胜; 
 auto screen = Gdk :: Screen :: get_default（）; 
 auto ctx = label.get_style_context（）; 
 ctx-> add_provider_for_screen（screen，css，GTK_STYLE_PROVIDER_PRIORITY_APPLICATION）; 
 win.add（label）; 
 win.show_all（）; 
 
 app.run（win）; 
返回0; 
} 
  

I'm programming in c++ with gtkmm3. I want to change some fonts in my program. I read all the things about CssStyleProvider, StyleContext in gtkmm documentation and also in gtk+ documentaion but i couldn't make it work and couldn't find any tutorial about that. I'm trying like that

Glib::ustring data;
data="GtkMenuBar, GtkMenuItem {font-name: Sans 6}"; /*tried with semi-colon, too*/
Glib::RefPtr<Gtk::CssProvider> asd = Gtk::CssProvider::create();
Glib::RefPtr<Gtk::StyleContext> asd2 = Gtk::StyleContext::create();
asd->load_from_data(data);
asd2->add_provider(asd, 0); /*also tried different priorities*/

also tried like that

Glib::ustring data;
data="GtkMenuBar, GtkMenuItem {font-name: Sans 6}"; /*tried with semi-colon, too*/
Glib::RefPtr<Gtk::CssProvider> asd = Gtk::CssProvider::create();
Glib::RefPtr<Gdk::Screen> screen;
Glib::RefPtr<Gtk::StyleContext> asd2 = Gtk::StyleContext::create();
asd->load_from_data(data);
(mainWindow.get())->get_property("screen", screen);
asd2->add_provider(screen, asd, 0); /*also tried different priorities*/

And I tried these before running my main window and after running it but i have no luck. Any help is appreciated.

解决方案

Have you also to tried to use the macro GTK_STYLE_PROVIDER_PRIORITY_APPLICATION instead of 0?

asd2->add_provider(screen, asd, macro GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);

Works for me, also on Windows.

Example:

int main(int argc, char **argv) {

  Main app(argc, argv);
  Glib::ustring data = "GtkLabel {color: #ff00ea;font: Comic Sans MS 12}";
  auto css = CssProvider::create();
  if(not css->load_from_data(data)) {
      cerr << "Failed to load css\n";
      std::exit(1);
  }
  Label label("test");
  Window win;
  auto screen = Gdk::Screen::get_default();
  auto ctx = label.get_style_context();
  ctx->add_provider_for_screen(screen, css, GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
  win.add(label);
  win.show_all();

  app.run(win);
  return 0;
}

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