Add test.c
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#include <gtk/gtk.h>
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GtkWidget *hscale, *vscale;
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void cb_pos_menu_select( GtkWidget *item, GtkPositionType pos )
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{
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/* 设置两个比例构件的比例值的显示位置 */
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gtk_scale_set_value_pos (GTK_SCALE (hscale), pos);
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gtk_scale_set_value_pos (GTK_SCALE (vscale), pos);
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}
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void cb_update_menu_select( GtkWidget *item, GtkUpdateType policy )
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{
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/* 设置两个比例构件的更新方式 */
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gtk_range_set_update_policy (GTK_RANGE (hscale), policy);
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gtk_range_set_update_policy (GTK_RANGE (vscale), policy);
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}
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void cb_digits_scale( GtkAdjustment *adj )
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{
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/* 设置 adj->value 圆整的小数位数 */
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gtk_scale_set_digits (GTK_SCALE (hscale), (gint) adj->value);
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gtk_scale_set_digits (GTK_SCALE (vscale), (gint) adj->value);
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}
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void cb_page_size( GtkAdjustment *get, GtkAdjustment *set )
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{
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/* 将示例调整对象的 page size 和 page increment size 设置
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* 为"Page Size"比例构件指定的值 */
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set->page_size = get->value;
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set->page_increment = get->value;
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/* 设置调整对象的值并使它引发一个 "changed" 信号,以重新配置所有
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* 已经连接到这个调整对象的构件。 */
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gtk_adjustment_set_value (set, CLAMP (set->value,
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set->lower, (set->upper - set->page_size)));
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}
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void cb_draw_value( GtkToggleButton *button )
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{
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/* 根据复选按钮的状态设置在比例构件上是否显示比例值 */
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gtk_scale_set_draw_value (GTK_SCALE (hscale), button->active);
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gtk_scale_set_draw_value (GTK_SCALE (vscale), button->active);
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}
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/* 方便的函数 */
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GtkWidget *make_menu_item (gchar *name, GCallback callback, gpointer data)
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{
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GtkWidget *item;
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item = gtk_menu_item_new_with_label (name);
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g_signal_connect (G_OBJECT (item), "activate", callback, data);
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gtk_widget_show (item);
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return item;
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}
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void scale_set_default_values( GtkScale *scale )
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{
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gtk_range_set_update_policy (GTK_RANGE (scale),
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GTK_UPDATE_CONTINUOUS);
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gtk_scale_set_digits (scale, 1);
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gtk_scale_set_value_pos (scale, GTK_POS_TOP);
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gtk_scale_set_draw_value (scale, TRUE);
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}
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/* 创建示例窗口 */
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void create_range_controls( void )
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{
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GtkWidget *window;
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GtkWidget *box1, *box2, *box3;
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GtkWidget *button;
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GtkWidget *scrollbar;
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GtkWidget *separator;
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GtkWidget *opt, *menu, *item;
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GtkWidget *label;
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GtkWidget *scale;
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GtkObject *adj1, *adj2;
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/* 标准的创建窗口代码 */
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (gtk_main_quit), NULL);
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gtk_window_set_title (GTK_WINDOW (window), "RT's range controls");
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box1 = gtk_vbox_new (FALSE, 0);
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gtk_container_add (GTK_CONTAINER (window), box1);
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gtk_widget_show (box1);
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box2 = gtk_hbox_new (FALSE, 10);
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gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
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gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
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gtk_widget_show (box2);
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/* value, lower, upper, step_increment, page_increment, page_size */
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/* 注意,page_size 值只对滚动条构件有区别,并且,你实际上能取得的最高值
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* 是(upper - page_size)。 */
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adj1 = gtk_adjustment_new (0.0, 0.0, 101.0, 0.1, 1.0, 1.0);
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vscale = gtk_vscale_new (GTK_ADJUSTMENT (adj1));
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scale_set_default_values (GTK_SCALE (vscale));
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gtk_box_pack_start (GTK_BOX (box2), vscale, TRUE, TRUE, 0);
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gtk_widget_show (vscale);
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box3 = gtk_vbox_new (FALSE, 10);
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gtk_box_pack_start (GTK_BOX (box2), box3, TRUE, TRUE, 0);
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gtk_widget_show (box3);
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/* 重新使用同一个调整对象 */
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hscale = gtk_hscale_new (GTK_ADJUSTMENT (adj1));
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gtk_widget_set_size_request (GTK_WIDGET (hscale), 200, -1);
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scale_set_default_values (GTK_SCALE (hscale));
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gtk_box_pack_start (GTK_BOX (box3), hscale, TRUE, TRUE, 0);
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gtk_widget_show (hscale);
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/* 再次重用同一个调整对象 */
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scrollbar = gtk_hscrollbar_new (GTK_ADJUSTMENT (adj1));
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/* 注意,这导致当滚动条移动时,比例构件总是连续更新 */
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gtk_range_set_update_policy (GTK_RANGE (scrollbar),
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GTK_UPDATE_CONTINUOUS);
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gtk_box_pack_start (GTK_BOX (box3), scrollbar, TRUE, TRUE, 0);
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gtk_widget_show (scrollbar);
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box2 = gtk_hbox_new (FALSE, 10);
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gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
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gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
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gtk_widget_show (box2);
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/* 用一个复选按钮控制是否显示比例构件的值 */
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button = gtk_check_button_new_with_label("Display value on scale widgets");
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gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (button), TRUE);
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g_signal_connect (G_OBJECT (button), "toggled",
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G_CALLBACK (cb_draw_value), NULL);
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gtk_box_pack_start (GTK_BOX (box2), button, TRUE, TRUE, 0);
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gtk_widget_show (button);
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box2 = gtk_hbox_new (FALSE, 10);
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gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
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/* 用一个选项菜单以改变显示值的位置 */
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label = gtk_label_new ("Scale Value Position:");
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gtk_box_pack_start (GTK_BOX (box2), label, FALSE, FALSE, 0);
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gtk_widget_show (label);
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opt = gtk_option_menu_new ();
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menu = gtk_menu_new ();
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item = make_menu_item ("Top", G_CALLBACK (cb_pos_menu_select),
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GINT_TO_POINTER (GTK_POS_TOP));
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gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
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item = make_menu_item ("Bottom", G_CALLBACK (cb_pos_menu_select),
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GINT_TO_POINTER (GTK_POS_BOTTOM));
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gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
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item = make_menu_item ("Left", G_CALLBACK (cb_pos_menu_select),
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GINT_TO_POINTER (GTK_POS_LEFT));
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gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
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item = make_menu_item ("Right", G_CALLBACK (cb_pos_menu_select),
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GINT_TO_POINTER (GTK_POS_RIGHT));
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gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
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gtk_option_menu_set_menu (GTK_OPTION_MENU (opt), menu);
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gtk_box_pack_start (GTK_BOX (box2), opt, TRUE, TRUE, 0);
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gtk_widget_show (opt);
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gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
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gtk_widget_show (box2);
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box2 = gtk_hbox_new (FALSE, 10);
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gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
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/* 另一个选项菜单,这里是用于设置比例构件的更新方式 */
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label = gtk_label_new ("Scale Update Policy:");
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gtk_box_pack_start (GTK_BOX (box2), label, FALSE, FALSE, 0);
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gtk_widget_show (label);
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opt = gtk_option_menu_new ();
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menu = gtk_menu_new ();
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item = make_menu_item ("Continuous", G_CALLBACK (cb_update_menu_select),
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GINT_TO_POINTER (GTK_UPDATE_CONTINUOUS));
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gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
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item = make_menu_item ("Discontinuous", G_CALLBACK (cb_update_menu_select),
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GINT_TO_POINTER (GTK_UPDATE_DISCONTINUOUS));
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gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
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item = make_menu_item ("Delayed", G_CALLBACK (cb_update_menu_select),
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GINT_TO_POINTER (GTK_UPDATE_DELAYED));
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gtk_menu_shell_append (GTK_MENU_SHELL (menu), item);
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gtk_option_menu_set_menu (GTK_OPTION_MENU (opt), menu);
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gtk_box_pack_start (GTK_BOX (box2), opt, TRUE, TRUE, 0);
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gtk_widget_show (opt);
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gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
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gtk_widget_show (box2);
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box2 = gtk_hbox_new (FALSE, 10);
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gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
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/* 一个水平比例构件,用于调整示例比例构件的显示小数位数。 */
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label = gtk_label_new ("Scale Digits:");
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gtk_box_pack_start (GTK_BOX (box2), label, FALSE, FALSE, 0);
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gtk_widget_show (label);
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adj2 = gtk_adjustment_new (1.0, 0.0, 5.0, 1.0, 1.0, 0.0);
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g_signal_connect (G_OBJECT (adj2), "value_changed",
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G_CALLBACK (cb_digits_scale), NULL);
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scale = gtk_hscale_new (GTK_ADJUSTMENT (adj2));
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gtk_scale_set_digits (GTK_SCALE (scale), 0);
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gtk_box_pack_start (GTK_BOX (box2), scale, TRUE, TRUE, 0);
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gtk_widget_show (scale);
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gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
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gtk_widget_show (box2);
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box2 = gtk_hbox_new (FALSE, 10);
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gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
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/* 以及,最后一个水平比例构件用于调整滚动条的 page size。 */
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label = gtk_label_new ("Scrollbar Page Size:");
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gtk_box_pack_start (GTK_BOX (box2), label, FALSE, FALSE, 0);
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gtk_widget_show (label);
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adj2 = gtk_adjustment_new (1.0, 1.0, 101.0, 1.0, 1.0, 0.0);
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g_signal_connect (G_OBJECT (adj2), "value_changed",
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G_CALLBACK (cb_page_size), adj1);
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scale = gtk_hscale_new (GTK_ADJUSTMENT (adj2));
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gtk_scale_set_digits (GTK_SCALE (scale), 0);
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gtk_box_pack_start (GTK_BOX (box2), scale, TRUE, TRUE, 0);
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gtk_widget_show (scale);
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gtk_box_pack_start (GTK_BOX (box1), box2, TRUE, TRUE, 0);
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gtk_widget_show (box2);
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separator = gtk_hseparator_new ();
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gtk_box_pack_start (GTK_BOX (box1), separator, FALSE, TRUE, 0);
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gtk_widget_show (separator);
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box2 = gtk_vbox_new (FALSE, 10);
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gtk_container_set_border_width (GTK_CONTAINER (box2), 10);
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gtk_box_pack_start (GTK_BOX (box1), box2, FALSE, TRUE, 0);
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gtk_widget_show (box2);
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button = gtk_button_new_with_label ("Quit");
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g_signal_connect_swapped (G_OBJECT (button), "clicked",
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G_CALLBACK (gtk_main_quit), NULL);
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gtk_box_pack_start (GTK_BOX (box2), button, TRUE, TRUE, 0);
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GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
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gtk_widget_grab_default (button);
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gtk_widget_show (button);
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gtk_widget_show (window);
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}
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int main( int argc, char *argv[] )
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{
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gtk_init (&argc, &argv);
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create_range_controls ();
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gtk_main ();
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return 0;
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}
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