gtkmm4 应用程序使用 CSS 样式-编程知识

gtkmm4 应用程序使用 CSS 样式

文章目录

前言
css选择器
css文件示例
源代码
效果

前言

程序样式和代码逻辑分离开使代码逻辑更可观

css选择器

Cambalache提供了两种
css-classes 相当于css里的类名:class=“类名”
css-name 相当于css里的标签名:spin div p 啥的
如上我设置了这个按钮控件的类名为testButton
标签名为myButton

它的Xml视图是这样的

<?xml version='1.0' encoding='UTF-8'?>
<!-- Created with Cambalache 0.16.0 -->
<interface><!-- interface-name temp3.ui --><requires lib="gtk" version="4.12"/><object class="GtkButton" id="Button1"><property name="css-classes">testButton</property><property name="css-name">myButton</property><property name="focusable">True</property><property name="hexpand">True</property><property name="label">Button1</property><property name="vexpand">True</property><property name="vexpand-set">True</property></object>
</interface>

css文件示例

.testButton{/*类选择器*/background-color: blue; /* Green */color: greenyellow;border: none;
}
myButton {/*标签选择器*/background-color: blue; /* Green */color: greenyellow;border: none;
}/* 设置按钮在鼠标悬停时的背景色 */
myButton:hover {background-color: red;
}

源代码

#include <gtkmm.h>
#include <iostream>
class MainWindow : public Gtk::Window
{
public:// Member widgets:MainWindow(){// Set window propertiesset_title("GTKMM4 with CSS Example");set_default_size(200, 200);auto refBuilder= Gtk::Builder::create_from_file("K:\\VM_Shared\\temp3.ui");auto pButton = refBuilder->get_widget<Gtk::Button>("Button1");set_child(*pButton);pButton->set_visible();// Load CSS stylesload_css();}private:void load_css(){// Check if CSS file existsif (Glib::file_test("K:\\VM_Shared\\Style.css", Glib::FileTest::EXISTS)){// Create CSS provider and load CSS fileauto css_provider = Gtk::CssProvider::create();css_provider->load_from_path("K:\\VM_Shared\\Style.css");// Get the default screen and add the CSS providerauto screen = Gdk::Display::get_default();Gtk::StyleContext::add_provider_for_display(screen, css_provider,GTK_STYLE_PROVIDER_PRIORITY_APPLICATION );}else{std::cerr << "Failed to load CSS file: styles.css" << std::endl;}}
};int main(int argc, char* argv[])
{auto app=Gtk::Application::create("org.HelleCssExample");return app->make_window_and_run<MainWindow>(argc, argv);
}