GtkDialog（5）

GtkDialog（1）

GtkDialog（2）

GtkDialog（3）

GtkDialog（4）

這篇我們将學習

Dialog

的信号相關操作。

Signals

例子

#include <gtk/gtk.h>

static GtkWidget *create_window(const gint, const gint);

void response_cb(GtkDialog *dialog, int response_id, GtkWindow *window)
{
	if (!GTK_IS_DIALOG(dialog) && !GTK_IS_WINDOW(window))
	{
		g_print("參數錯誤\n");
		return;
	}

	switch (response_id)
	{
	case 1:
		g_print("The OK button was clicked\n");
		gtk_widget_destroy(GTK_WIDGET(window));
		break;
	case 2:
		g_print("The Cancel button was clicked\n");
		gtk_widget_destroy(GTK_WIDGET(dialog));
		break;
	default:
		break;
	}
}

void close_cb(GtkDialog *dialog)
{
	if (!GTK_IS_DIALOG(dialog))
	{
		g_print("參數錯誤\n");
		return;
	}
	g_print("Esc key was pressed\n");
	gtk_widget_destroy(GTK_WIDGET(dialog));
}

void button_clicked_cb(GtkWindow *window)
{
	GtkWidget *dialog;

	/// *** dialog
	dialog = gtk_dialog_new();
	gtk_window_set_title(GTK_WINDOW(dialog), "Dialog");
	gtk_widget_set_size_request(dialog, 200, 300);
	gtk_window_set_transient_for(GTK_WINDOW(dialog), window);
	gtk_window_set_modal(GTK_WINDOW(dialog), TRUE);
	/// ***
	gtk_dialog_add_buttons(GTK_DIALOG(dialog), "OK", 1, "Cancel", 2, NULL);
	/// ***
	gtk_dialog_set_default_response(GTK_DIALOG(dialog), 1);
	/// *** signals 響應_id
	g_signal_connect(dialog, "response", G_CALLBACK(response_cb), window);
	/// *** 預設鍵為Esc，按下後即可觸發"close"信号
	g_signal_connect_swapped(dialog, "close", G_CALLBACK(close_cb), dialog);

	/// ***
	gtk_widget_show_all(dialog);
}

int main(int argc, char *argv[])
{
	gtk_init(&argc, &argv);

	GtkWidget *window;
	GtkWidget *button;

	/// *** Create a Window
	window = create_window(400, 500);
	/// *** Create a button
	button = gtk_button_new_with_mnemonic("_Open the dialog");
	g_object_set(button,
		     "margin", 50,
		     "parent", window,
		     NULL);
	g_signal_connect_swapped(button, "clicked", G_CALLBACK(button_clicked_cb), window);

	gtk_widget_show_all(window);
	gtk_main();
}

static GtkWidget *create_window(const gint w, const gint h)
{
	GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
	g_signal_connect(window, "destroy", G_CALLBACK(gtk_main_quit), NULL);
	gtk_window_set_default_size(GTK_WINDOW(window), w, h);
	gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
	gtk_window_set_title(GTK_WINDOW(window), "Hello GTK3");
	gtk_container_set_border_width(GTK_CONTAINER(window), 50);

	return window;
}
           

• 運作效果

點選

Open the dialog

，打開Dialog

點選

Cancel

，關閉Dialog

點選

OK

或者按下

Enter

鍵關閉整個應用程式

按下

Esc

鍵關閉Dialog