Διάλογος επιλογής χρώματος (ColorChooserDialog)
Η ColorChooserDialog επιτρέπει στον χρήστη να διαλέξει ένα χρώμα. Η ColorButton ανοίγει έναν διάλογο επιλογής χρώματος όταν πατιέται.
- 16.3.1. Παράδειγμα
16.3.1. Παράδειγμα
File: examplewindow.h (For use with gtkmm 3, not gtkmm 2)
#ifndef GTKMM_EXAMPLEWINDOW_H #define GTKMM_EXAMPLEWINDOW_H #include <gtkmm.h> class ExampleWindow : public Gtk::Window { public: ExampleWindow(); virtual ~ExampleWindow(); protected: //Signal handlers: void on_color_button_color_set(); void on_button_dialog_clicked(); //Child widgets: Gtk::Box m_VBox; Gtk::ColorButton m_ColorButton; Gtk::Button m_Button_Dialog; Gtk::DrawingArea m_DrawingArea; //To show the color. Gdk::RGBA m_Color; }; #endif //GTKMM_EXAMPLEWINDOW_H
File: examplewindow.cc (For use with gtkmm 3, not gtkmm 2)
#include "examplewindow.h" #include <iostream> ExampleWindow::ExampleWindow() : m_VBox(Gtk::ORIENTATION_VERTICAL, 5), m_Button_Dialog("Choose Color") { set_title("Gtk::ColorChooserDialog example"); set_default_size(200, 200); add(m_VBox); m_VBox.pack_start(m_ColorButton, Gtk::PACK_SHRINK); m_ColorButton.signal_color_set().connect(sigc::mem_fun(*this, &ExampleWindow::on_color_button_color_set) ); m_VBox.pack_start(m_Button_Dialog, Gtk::PACK_SHRINK); m_Button_Dialog.signal_clicked().connect(sigc::mem_fun(*this, &ExampleWindow::on_button_dialog_clicked) ); //Set start color: m_Color.set_red(0.0); m_Color.set_green(0.0); m_Color.set_blue(1.0); m_Color.set_alpha(1.0); //opaque m_ColorButton.set_rgba(m_Color); m_DrawingArea.override_background_color(m_Color); m_VBox.pack_start(m_DrawingArea); show_all_children(); } ExampleWindow::~ExampleWindow() { } void ExampleWindow::on_color_button_color_set() { //Store the chosen color, and show it: m_Color = m_ColorButton.get_rgba(); m_DrawingArea.override_background_color(m_Color); } void ExampleWindow::on_button_dialog_clicked() { Gtk::ColorChooserDialog dialog("Please choose a color"); dialog.set_transient_for(*this); //Get the previously selected color: dialog.set_rgba(m_Color); const int result = dialog.run(); //Handle the response: switch(result) { case Gtk::RESPONSE_OK: { //Store the chosen color, and show it: m_Color = dialog.get_rgba(); m_ColorButton.set_rgba(m_Color); m_DrawingArea.override_background_color(m_Color); break; } case Gtk::RESPONSE_CANCEL: { std::cout << "Cancel clicked." << std::endl; break; } default: { std::cout << "Unexpected button clicked: " << result << std::endl; break; } } }
File: main.cc (For use with gtkmm 3, not gtkmm 2)
#include "examplewindow.h" #include <gtkmm/application.h> int main(int argc, char *argv[]) { Glib::RefPtr<Gtk::Application> app = Gtk::Application::create(argc, argv, "org.gtkmm.example"); ExampleWindow window; //Shows the window and returns when it is closed. return app->run(window); }