GTK对话框

转自：http://blog.sina.com.cn/s/blog_6d8df7d00100uuxr.html

对话框窗口是众多GUI应用程序中不可或缺的部分。对话框经常是很多人进行信息交流的桥梁。在计算机中，对话框也经常扮演着我们和应用程序进行对话的工具。对话框可以用来输入数据，修改数据，或者改变应用程序的使用设置信息。对话框是一个人机交互的重要手段。

消息对话框（Message dialogs）

消息对话框可以方便的在你的应用程序中，跳出来显示一些有用的信息。当然可以包含文字或者图象。

#include

void show_info(GtkWidget *widget, gpointer window)
{
GtkWidget *dialog;
dialog = gtk_message_dialog_new(window,
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_INFO,
GTK_BUTTONS_OK,
"Download Completed", "title");
gtk_window_set_title(GTK_WINDOW(dialog), "Information");
gtk_dialog_run(GTK_DIALOG(dialog));
gtk_widget_destroy(dialog);
}

void show_error(GtkWidget *widget, gpointer window)
{
GtkWidget *dialog;
dialog = gtk_message_dialog_new(window,
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_ERROR,
GTK_BUTTONS_OK,
"Error loading file");
gtk_window_set_title(GTK_WINDOW(dialog), "Error");
gtk_dialog_run(GTK_DIALOG(dialog));
gtk_widget_destroy(dialog);
}

void show_question(GtkWidget *widget, gpointer window)
{
GtkWidget *dialog;
dialog = gtk_message_dialog_new(window,
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_QUESTION,
GTK_BUTTONS_YES_NO,
"Are you sure to quit?");
gtk_window_set_title(GTK_WINDOW(dialog), "Question");
gtk_dialog_run(GTK_DIALOG(dialog));
gtk_widget_destroy(dialog);
}

void show_warning(GtkWidget *widget, gpointer window)
{
GtkWidget *dialog;
dialog = gtk_message_dialog_new(window,
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_WARNING,
GTK_BUTTONS_OK,
"Unallowed operation");
gtk_window_set_title(GTK_WINDOW(dialog), "Warning");
gtk_dialog_run(GTK_DIALOG(dialog));
gtk_widget_destroy(dialog);
}

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

GtkWidget *window;
GtkWidget *table;

GtkWidget *info;
GtkWidget *warn;
GtkWidget *que;
GtkWidget *err;

gtk_init(&argc, &argv);

window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 220, 150);
gtk_window_set_title(GTK_WINDOW(window), "Message dialogs");

table = gtk_table_new(2, 2, TRUE);
gtk_table_set_row_spacings(GTK_TABLE(table), 2);
gtk_table_set_col_spacings(GTK_TABLE(table), 2);

info = gtk_button_new_with_label("Info");
warn = gtk_button_new_with_label("Warning");
que = gtk_button_new_with_label("Question");
err = gtk_button_new_with_label("Error");

gtk_table_attach(GTK_TABLE(table), info, 0, 1, 0, 1,
GTK_FILL, GTK_FILL, 3, 3);
gtk_table_attach(GTK_TABLE(table), warn, 1, 2, 0, 1,
GTK_FILL, GTK_FILL, 3, 3);
gtk_table_attach(GTK_TABLE(table), que, 0, 1, 1, 2,
GTK_FILL, GTK_FILL, 3, 3);
gtk_table_attach(GTK_TABLE(table), err, 1, 2, 1, 2,
GTK_FILL, GTK_FILL, 3, 3);

gtk_container_add(GTK_CONTAINER(window), table);
gtk_container_set_border_width(GTK_CONTAINER(window), 15);

g_signal_connect(G_OBJECT(info), "clicked",
G_CALLBACK(show_info), (gpointer) window);

g_signal_connect(G_OBJECT(warn), "clicked",
G_CALLBACK(show_warning), (gpointer) window);

g_signal_connect(G_OBJECT(que), "clicked",
G_CALLBACK(show_question), (gpointer) window);

g_signal_connect(G_OBJECT(err), "clicked",
G_CALLBACK(show_error), (gpointer) window);

g_signal_connect_swapped(G_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), G_OBJECT(window));

gtk_widget_show_all(window);

gtk_main();

return 0;
}

在上面的示例中，我们展示了四种消息对话框。Information, Warning, Question和 Error 消息对话框。

GtkWidget *dialog;
dialog = gtk_message_dialog_new(window,
GTK_DIALOG_DESTROY_WITH_PARENT,
GTK_MESSAGE_QUESTION,
GTK_BUTTONS_YES_NO,
"Are you sure to quit?");

在函数show_question() 中，我们安排跳出了一个对话框。至于消息对话框是用函数gtk_message_dialog_new() 。 至于函数中的参数设置是在说明你想要显示那种样式的对话框。系统常量 GTK_MESSAGE_QUESTION 是在说明我们想要生成一个question对话框。系统常量GTK_BUTTONS_YES_NO将生成“yes“和”no “两个按钮。最后一个参数是我们想要在对话框中显示的文字。

gtk_window_set_title(GTK_WINDOW(dialog), "Warning");
gtk_dialog_run(GTK_DIALOG(dialog));
gtk_widget_destroy(dialog);

这里，我们为我们刚刚身成的消息对话框设置一个标题。最后运行这个对话框，接着设置了这个对话框必须手动关闭。

        

GTK应用程序信息对话框（GtkAboutDialog）

GTK应用程序对话框的是用来显示应用程序中的有关提示信息的。GTK应用程序对话框可以显示应用程序的logo ，名称，版本，版权，网站或者认证之类的信息。当然也可以在其中，给程序的作者，文档整理者，翻译者带来名誉上的声望。

#include


void show_about(GtkWidget *widget, gpointer data)
{

GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file("battery.png", NULL);

GtkWidget *dialog = gtk_about_dialog_new();
gtk_about_dialog_set_name(GTK_ABOUT_DIALOG(dialog), "Battery");
gtk_about_dialog_set_version(GTK_ABOUT_DIALOG(dialog), "0.9");
gtk_about_dialog_set_copyright(GTK_ABOUT_DIALOG(dialog),
"(c) Jan Bodnar");
gtk_about_dialog_set_comments(GTK_ABOUT_DIALOG(dialog),
"Battery is a simple tool for battery checking.");
gtk_about_dialog_set_website(GTK_ABOUT_DIALOG(dialog),
"");
gtk_about_dialog_set_logo(GTK_ABOUT_DIALOG(dialog), pixbuf);
g_object_unref(pixbuf), pixbuf = NULL;
gtk_dialog_run(GTK_DIALOG (dialog));
gtk_widget_destroy(dialog);

}


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

GtkWidget *window;
GtkWidget *about;
GdkPixbuf *battery;

gtk_init(&argc, &argv);

window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 220, 150);
gtk_window_set_title(GTK_WINDOW(window), "Battery");

gtk_container_set_border_width(GTK_CONTAINER(window), 15);
gtk_widget_add_events(window, GDK_BUTTON_PRESS_MASK);

battery = gtk_image_get_pixbuf(GTK_IMAGE(
gtk_image_new_from_file("battery.png")));

g_signal_connect(G_OBJECT(window), "button-press-event",
G_CALLBACK(show_about), (gpointer) window);

g_signal_connect_swapped(G_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), G_OBJECT(window));

gtk_widget_show_all(window);

gtk_main();

return 0;
}

上面的代码中我们用了构件GtkAboutDialog 以及该构件的一些特性。我们单击应用程序客户端窗口，该GTK应用程序信息对话框就会跳出来。：—）

GtkWidget *dialog = gtk_about_dialog_new();

我们要生成一个新的GtkAboutDialog构件。

gtk_about_dialog_set_name(GTK_ABOUT_DIALOG(dialog), "Battery");
gtk_about_dialog_set_version(GTK_ABOUT_DIALOG(dialog), "0.9");
gtk_about_dialog_set_copyright(GTK_ABOUT_DIALOG(dialog),
"(c) Jan Bodnar");

这个函数是用来设置一个名字，版本以及版权的。

GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file("battery.png", NULL);
...
gtk_about_dialog_set_logo(GTK_ABOUT_DIALOG(dialog), pixbuf);
g_object_unref(pixbuf), pixbuf = NULL;

这段代码为我们的对话框设置了一个logo图标。

Figure: GtkAboutDialog

GTK字体选择对话框（GtkFontSelectionDialog）

GTK字体选择对话框是用来让我们选择字体的。这在一些应用程序中很有代表性。尤其是一些文字处理或者文字排版的软件。

#include


void select_font(GtkWidget *widget, gpointer label)
{

GtkResponseType result;

GtkWidget *dialog = gtk_font_selection_dialog_new("Select Font");
result = gtk_dialog_run(GTK_DIALOG(dialog));

if (result == GTK_RESPONSE_OK || result == GTK_RESPONSE_APPLY)
{

PangoFontDescription *font_desc;
gchar *fontname = gtk_font_selection_dialog_get_font_name(
GTK_FONT_SELECTION_DIALOG(dialog));

font_desc = pango_font_description_from_string(fontname);

gtk_widget_modify_font(GTK_WIDGET(label), font_desc);

g_free(fontname);
}


gtk_widget_destroy(dialog);
}


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

GtkWidget *window;
GtkWidget *label;
GtkWidget *vbox;

GtkWidget *toolbar;
GtkToolItem *font;

gtk_init(&argc, &argv);

window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 280, 200);
gtk_window_set_title(GTK_WINDOW(window), "Font Selection Dialog");

vbox = gtk_vbox_new(FALSE, 0);
gtk_container_add(GTK_CONTAINER(window), vbox);


toolbar = gtk_toolbar_new();
gtk_toolbar_set_style(GTK_TOOLBAR(toolbar), GTK_TOOLBAR_ICONS);

gtk_container_set_border_width(GTK_CONTAINER(toolbar), 2);

font = gtk_tool_button_new_from_stock(GTK_STOCK_SELECT_FONT);
gtk_toolbar_insert(GTK_TOOLBAR(toolbar), font, -1);

gtk_box_pack_start(GTK_BOX(vbox), toolbar, FALSE, FALSE, 5);

label = gtk_label_new("ZetCode");
gtk_label_set_justify(GTK_LABEL(label), GTK_JUSTIFY_CENTER);
gtk_box_pack_start(GTK_BOX(vbox), label, TRUE, FALSE, 5);


g_signal_connect(G_OBJECT(font), "clicked",
G_CALLBACK(select_font), label);

g_signal_connect_swapped(G_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), NULL);

gtk_widget_show_all(window);

gtk_main();

return 0;
}

在上面的代码示例中，我们在窗口的中央放置了一个简单标签；如果你点击工具栏按钮，那么字体选择对话框就会跳出来 .

GtkWidget *dialog = gtk_font_selection_dialog_new("Select Font");
result = gtk_dialog_run(GTK_DIALOG(dialog));

我们生成了一个字体选择对话框构件即 GtkFontSelectionDialog。

if (result == GTK_RESPONSE_OK || result == GTK_RESPONSE_APPLY)
{
PangoFontDescription *font_desc;
gchar *fontname = gtk_font_selection_dialog_get_font_name(
GTK_FONT_SELECTION_DIALOG(dialog));

font_desc = pango_font_description_from_string(fontname);

gtk_widget_modify_font(GTK_WIDGET(label), font_desc);
g_free(fontname);
}

如果用户点击“OK“按钮。我们就得到了字体的相关信息，并且把该设置信息作用于前面生成的标签。

Figure: GtkFontSelectionDialog

GTK色彩选择对话框（GtkColorSelectionDialog）

顾名思义GTK色彩选择对话框就是一个用于颜色选择的对话框。

#include


void select_font(GtkWidget *widget, gpointer label)
{

GtkResponseType result;
GtkColorSelection *colorsel;

GtkWidget *dialog = gtk_color_selection_dialog_new("Font Color");
result = gtk_dialog_run(GTK_DIALOG(dialog));

if (result == GTK_RESPONSE_OK)
{

GdkColor color;

colorsel = GTK_COLOR_SELECTION(
GTK_COLOR_SELECTION_DIALOG(dialog)->colorsel);
gtk_color_selection_get_current_color(colorsel,
&color);

gtk_widget_modify_fg(GTK_WIDGET(label),
GTK_STATE_NORMAL,
&color);
}

gtk_widget_destroy(dialog);
}


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

GtkWidget *window;
GtkWidget *widget;
GtkWidget *label;
GtkWidget *vbox;

GtkWidget *toolbar;
GtkToolItem *font;


gtk_init(&argc, &argv);

window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);
gtk_window_set_default_size(GTK_WINDOW(window), 280, 200);
gtk_window_set_title(GTK_WINDOW(window), "Color Selection Dialog");

vbox = gtk_vbox_new(FALSE, 0);
gtk_container_add(GTK_CONTAINER(window), vbox);


toolbar = gtk_toolbar_new();
gtk_toolbar_set_style(GTK_TOOLBAR(toolbar), GTK_TOOLBAR_ICONS);

gtk_container_set_border_width(GTK_CONTAINER(toolbar), 2);

font = gtk_tool_button_new_from_stock(GTK_STOCK_SELECT_COLOR);
gtk_toolbar_insert(GTK_TOOLBAR(toolbar), font, -1);

gtk_box_pack_start(GTK_BOX(vbox), toolbar, FALSE, FALSE, 5);

label = gtk_label_new("ZetCode");
gtk_label_set_justify(GTK_LABEL(label), GTK_JUSTIFY_CENTER);
gtk_box_pack_start(GTK_BOX(vbox), label, TRUE, FALSE, 5);


g_signal_connect(G_OBJECT(font), "clicked",
G_CALLBACK(select_font), label);

g_signal_connect_swapped(G_OBJECT(window), "destroy",
G_CALLBACK(gtk_main_quit), NULL);

gtk_widget_show_all(window);

gtk_main();

return 0;
}

这个示例与前面的字体选择对话框非常的类似。不过这里我们要完成的任务是改变标签文字的颜色。

GtkWidget *dialog = gtk_color_selection_dialog_new("Font Color");
result = gtk_dialog_run(GTK_DIALOG(dialog));

当然首先是生成一个 GtkColorSelectionDialog构件。

if (result == GTK_RESPONSE_OK)
{
GdkColor color;

colorsel = GTK_COLOR_SELECTION(
GTK_COLOR_SELECTION_DIALOG(dialog)->colorsel);
gtk_color_selection_get_current_color(colorsel,
&color);

gtk_widget_modify_fg(GTK_WIDGET(label),
GTK_STATE_NORMAL,
&color);
}