使用c++ cmake 调用gtk3接口实现一个简单的窗口

点按按钮会改变按钮文本为clicked

效果展示

image.png

编译运行方式

环境配置:

apt update && apt install libgtk-3-dev g++ cmake

编译方式:

cmake && make

运行:

./gtk-test

源码

main.cpp

#include <gtk/gtk.h>
#include <iostream>

//用于两个按钮的回调函数
void callback_btn(GtkApplication *app, gpointer user_data)
{
    GtkButton *btn_a = (GtkButton *)user_data;
    gtk_button_set_label(btn_a, "clicked"); //重命名按钮的文本
}

//gtk首次初始化会发出信号“activate”, 该函数作为此信号的回调函数
void activate(GtkApplication *app, gpointer user_data)
{
    GtkWidget *win, *boxv, *boxh, *alert, *btn_a, *btn_b, *label_blank;

    //设置窗口属性
    win = gtk_application_window_new(app);
    gtk_window_set_title(GTK_WINDOW(win), "Window");
    gtk_widget_set_name(win, "alert01");
    gtk_window_set_default_size(GTK_WINDOW(win), 400, 200);
    // gtk_window_set_decorated(GTK_WINDOW(win), FALSE); //无边框
    gtk_window_set_position(GTK_WINDOW(win), GTK_WIN_POS_CENTER);

    //先创建一个垂直布局的box, 添加进窗口
    //box可放置多个控件, 控件会按添加顺序依次垂直排列
    boxv = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
    gtk_container_add(GTK_CONTAINER(win), boxv);

    //创建label控件, 设置横向与纵向自动扩展, 添加到box中
    alert = gtk_label_new("text");
    gtk_widget_set_hexpand(alert, TRUE);
    gtk_widget_set_vexpand(alert, TRUE);
    gtk_container_add(GTK_CONTAINER(boxv), alert);

    //创建一个横向布局的box, 也添加进boxv中, 位于label下面
    boxh = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);

    //创建三个控件, 添加进boxh中. 第一个空label设置横向自动扩展, 后面是两个按钮
    //由于空label自动扩展, 这样两个按钮就会被挤到右下角
    label_blank = gtk_label_new("");
    gtk_widget_set_hexpand(label_blank, TRUE);
    btn_a = gtk_button_new_with_label("btn01");
    g_signal_connect(btn_a, "clicked", G_CALLBACK(callback_btn), btn_a);
    btn_b = gtk_button_new_with_label("btn02");
    g_signal_connect(btn_b, "clicked", G_CALLBACK(callback_btn), btn_b);
    gtk_container_add(GTK_CONTAINER(boxh), label_blank);
    gtk_container_add(GTK_CONTAINER(boxh), btn_a);
    gtk_container_add(GTK_CONTAINER(boxh), btn_b);

    gtk_container_add(GTK_CONTAINER(boxv), boxh);

    //将控件设置为显示状态
    gtk_widget_show_all (win);
}

int main(int argc, char **argv)
{
    GtkApplication *app;
    int status;

    app = gtk_application_new("org.gtk.example", G_APPLICATION_DEFAULT_FLAGS);
    g_signal_connect(app, "activate", G_CALLBACK(activate), NULL); //设置activate信号以及回调函数
    status = g_application_run(G_APPLICATION(app), argc, argv);
    g_object_unref(app);

    return status;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.0.0)
project(gtk_test VERSION 0.5.0 LANGUAGES C CXX)

find_package(PkgConfig REQUIRED)
pkg_check_modules(GTK3 REQUIRED gtk+-3.0)

include_directories(${GTK3_INCLUDE_DIRS})
link_directories(${GTK3_LIBRARY_DIRS})
list(APPEND FC_DEP_LIBS ${GTK3_LIBRARIES})
 
add_executable (gtk-test main.cpp)
 
target_link_libraries (gtk-test ${FC_DEP_LIBS})