按钮(Button)
可以通过两种方式来创建按钮,你可以在 Gtk::Button 构造函数中指定标签字符串,或者以后调用 set_label() 来指定标签。
如果你想为按钮定义一个快捷键,那么可以在标签字符串中的某个字符前面加上一个下划线,并且指定可选的参数助记符(mnemonic)为 true。例如:
Gtk::Button* pButton = new Gtk::Button("_Something", true);
Gtk::Button 同时也是一个容器,因此你可以在其中放任何其它的部件,比如放一个 Gtk::Image 在里面。
Gtk::Button部件具有clicked信号,当按下或释放按钮时将会发出该信号。
- 6.1.1. 示例
6.1.1. 示例
这个示例创建了一个有图片和文字标签的按钮。
File: buttons.h (For use with gtkmm 4)
#ifndef GTKMM_EXAMPLE_BUTTONS_H #define GTKMM_EXAMPLE_BUTTONS_H #include <gtkmm/window.h> #include <gtkmm/button.h> class Buttons : public Gtk::Window { public: Buttons(); virtual ~Buttons(); protected: //Signal handlers: void on_button_clicked(); //Child widgets: Gtk::Button m_button; }; #endif //GTKMM_EXAMPLE_BUTTONS_H
File: main.cc (For use with gtkmm 4)
#include "buttons.h" #include <gtkmm/application.h> int main(int argc, char *argv[]) { auto app = Gtk::Application::create("org.gtkmm.example"); //Shows the window and returns when it is closed. return app->make_window_and_run<Buttons>(argc, argv); }
File: buttons.cc (For use with gtkmm 4)
#include "buttons.h" #include <gtkmm/box.h> #include <gtkmm/image.h> #include <gtkmm/label.h> #include <iostream> Buttons::Buttons() { // This corresponds to Gtk::Bin::add_pixlabel("info.xpm", "cool button") in gtkmm3. //Create Image and Label widgets: auto pmap = Gtk::make_managed<Gtk::Image>("info.xpm"); auto label = Gtk::make_managed<Gtk::Label>("cool button"); label->set_expand(true); //Put them in a Box: auto hbox = Gtk::make_managed<Gtk::Box>(Gtk::Orientation::HORIZONTAL, 5); hbox->append(*pmap); hbox->append(*label); //And put that Box in the button: m_button.set_child(*hbox); set_title("Pixmap'd buttons!"); m_button.signal_clicked().connect( sigc::mem_fun(*this, &Buttons::on_button_clicked) ); m_button.set_margin(10); set_child(m_button); } Buttons::~Buttons() { } void Buttons::on_button_clicked() { std::cout << "The Button was clicked." << std::endl; }