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c++ - How to set theme from css resource for multiple glade widgets in gtkmm3

问题描述

I did all the includes and used name spaces

#include "include/main.h"
#include <iostream>
#include <gtkmm.h>

using namespace std;
using namespace Gtk;

Window* appWindow = nullptr;

Loaded the glade file and tried to load a theme for widgets

    auto refBuilder = Builder::create();
    auto refProvider = CssProvider::create();
    auto refStyleContext = StyleContext::create();

try
{
    refBuilder->add_from_resource("/res/gui.glade");
    refProvider->load_from_resource("/res/theme.css");
}

Caught errors. Which it does. It gives an error when it cannnot load either of the resources.

catch(const Glib::FileError& ex)
{
    cerr << "FileError: " << ex.what() << endl;
    return 1;
}
catch(const Glib::MarkupError& ex)
{
    cerr << "MarkupError: " << ex.what() << endl;
    return 1;
}
catch(const Gtk::BuilderError& ex)
{
    cerr << "BuilderError: " << ex.what() << endl;
    return 1;
}

Now I cant seem to apply the css for my widgets

refBuilder->get_widget("winFrame", appWindow);
if(appWindow)
{
    Glib::RefPtr<Gdk::Screen>refScreen = appWindow->get_screen();

    refBuilder->get_widget("quit_Item", quitItem);
    refStyleContext->add_provider_for_screen(refScreen, refProvider, GTK_STYLE_PROVIDER_PRIORITY_USER);

    if(quitItem)
    {
        quitItem->signal_activate().connect( sigc::ptr_fun(on_button_clicked) );
    };

};
app->run(*appWindow);
delete appWindow;
return 0;

I have the following css which i used to try, but not even a button changed colour

.recordButton {
color: red;
background: blue;
border-color: red;
}

GtkBox{
background: #669999;
text-shadow: 1px 1px 5px black;
box-shadow: 0px 0px 5px black;
border: 1px solid black;
}
Buton{
background: #669999;
text-shadow: 1px 1px 5px black;
box-shadow: 0px 0px 5px black;
border: 1px solid black;
}

标签： c++gladegtkmm3

解决方案

重新访问我的代码后。我试图复制声明

try{}
catch {}

这就是我能够让它工作的方式

refBuilder->get_widget("winFrame", appWindow);
if(appWindow)
{
    try
    {
        refProvider->load_from_resource("/res/default-theme.css");
        Glib::RefPtr<Gdk::Screen> refScreen = appWindow->get_screen();
        refStyleContext->add_provider_for_screen(refScreen, refProvider, GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
    }
    catch(const Gio::ResourceError& ex)
    {
        cerr << "ResourceError: " << ex.what() << endl;
        return 1;
    }
    catch(const Glib::MarkupError& ex)
    {
        cerr << "MarkupError: " << ex.what() << endl;
        return 1;
    }
    catch(const Gtk::CssProviderError& ex)
    {
        cerr << "CssProviderError: " << ex.what() << endl;
        return 1;
    }
    catch(const Glib::Error& ex)
    {
        cerr << "GlibError: " << ex.what() << endl;
        return 1;
    };

};

我还发现我的 css 文件格式有问题。我从GTK+ CSS Reference获得了帮助。我的林间空地在 windows 之后有一个 GtkBox，所以新的 css 有

box * {
background-color: teal;
font: italic bold 14px Ani;
}

这适用于 GtkBox 下的孩子 可悲的是，我仍在努力让小部件周围的边框正常工作，但至少现在我知道正在应用 css 主题

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