这一章节介绍范围控件的一些基本函数的使用和实现,很多函数的细节,在GTK编程文档中有详细的介绍。我只是照抄了文档中的实例。当然生疏的部分自己也做了注释和理解。GTK文档链接在我的资源[里面可以下载](http://download.csdn.net/detail/jsh13417/6567043)
### 下面是范围控件的具体实例代码:
~~~
/*File:range_controls.c
*Date:2013-12-08
*Author:sjin
*Mail:413977243@qq.com
*/
#include <stdio.h>
#include <gtk/gtk.h>
#include <stdlib.h>
/*范围控件:
* 由一般按钮派生而来,只是开关按钮只有两个状态,通过点击
* 可以切换。
* 开关按钮是复选按钮和单选按钮的基础,所以单选按钮和复选按钮继承了
* 许多开关按钮的函数调用
*/
GtkWidget *hscale,*vscale;
void cb_pos_menu_select(GtkWidget *item,GtkPositionType pos)
{
/*设置两个比例构件的比例值的显示位置
*void gtk_scale_set_value_pos(GtkScale * scale,:比例构件
* GtkPositionType pos);:显示对象的位置
* GTK_POS_TOP
* GTK_POS_RIGHT
* GTK_POS_BOTTOM
* GTK_POS_LEFT
* */
printf("###%s,pos = %d \n",__func__,pos);
gtk_scale_set_value_pos(GTK_SCALE(hscale),pos);
gtk_scale_set_value_pos(GTK_SCALE(vscale),pos);
}
void cb_update_menu_select(GtkWidget *item,GtkUpdateType Policy)
{
/*设置两个比例控件的更新方式
*void gtk_range_set_update_policy(GtkRange *range,GtkUpdateType Policy);
*range : 范围控件
*Policy :更新方式,有以下三个
* GTK_UPDATE_CONTINUOUS:信号时连续引发的
* GTK_UPDATE_DISCONTINUOUS:只有滑块停止移动,用户释放鼠标时才引发
* GTK_UPDATE_DELAYED:当用户释放鼠标,或者滑块短期停止移动时引发
*
* */
gtk_range_set_update_policy(GTK_RANGE(hscale),Policy);
gtk_range_set_update_policy(GTK_RANGE(vscale),Policy);
}
void cb_digits_scale(GtkAdjustment *adj)
{
/*设置 小数的位数
*gtk_scale_set_digits(GtkScale *scale,gint Digits)
*参数:scale:比例构件对象
* Digits:要显示小数位数,最大13
* */
gtk_scale_set_digits(GTK_SCALE(hscale),(gint)adj->value);
gtk_scale_set_digits(GTK_SCALE(vscale),(gint)adj->value);
}
void cb_page_size(GtkAdjustment * get,GtkAdjustment * set)
{
/*将实例调整对象的page_size,和page_increment size设置为“page Size”
*比例控件指定的数值。
*/
set->page_size = get->value;
set->page_increment = get->value;
/*设置调整对象的值并使它引发一个“changed"信号,以重新配置所有已连接到这个调整对象的构件
*/
gtk_adjustment_set_value(set,CLAMP(set->value,set->lower,(set->upper-set->page_size)));
}
void cb_draw_value(GtkToggleButton * button)
{
/*根据复选框的状态设置在比例构件上是否显示比例值
*TRUE :显示 FALSE:不显示
* */
gtk_scale_set_draw_value(GTK_SCALE(hscale),button->active);
gtk_scale_set_draw_value(GTK_SCALE(vscale),button->active);
}
GtkWidget * make_menu_item(gchar *name,GCallback callback,gpointer data)
{
GtkWidget *item;
item = gtk_menu_item_new_with_label(name);
g_signal_connect(G_OBJECT(item),"activate",callback,data);
gtk_widget_show(item);
return item;
}
/*设置比例控件默认方式*/
void scale_set_default_values(GtkScale * scale)
{
gtk_range_set_update_policy(GTK_RANGE(scale),GTK_UPDATE_CONTINUOUS);
gtk_scale_set_digits(scale,1);
gtk_scale_set_value_pos(scale,GTK_POS_TOP);
gtk_scale_set_draw_value(scale,TRUE);
}
/*创建示例窗口*/
static void create_range_controls()
{
GtkWidget *window;
GtkWidget *button;
/*box1:纵向组装盒子
* */
GtkWidget *box1,*box2,*box3;
GtkWidget *scrollbar;
GtkWidget *separator;
GtkWidget *opt,*menu,*item;
GtkWidget *label;
GtkWidget *scale;
GtkWidget *adj1,*adj2;
/************标准的窗口代码**********/
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
/*这个一般必要有delete_event信号到主窗口*/
g_signal_connect(G_OBJECT(window),"delete_event",G_CALLBACK(gtk_main_quit),NULL);
/*设置窗口宽度*/
gtk_container_set_border_width(GTK_CONTAINER(window),20);
/*设置窗口标题*/
gtk_window_set_title(GTK_WINDOW(window),"范围控件练习");
/******************************/
/*创建一个纵向组装盒子*/
box1 = gtk_vbox_new(FALSE,0);
gtk_container_add(GTK_CONTAINER(window),box1);
gtk_widget_show(box1);
/*创建一个横向组装盒子*/
box2 = gtk_hbox_new(FALSE,0);
gtk_container_set_border_width(GTK_CONTAINER(box2),10);
gtk_box_pack_start(GTK_BOX(box1),box2,TRUE,TRUE,0);
gtk_widget_show(box2);
/*创建一个调整对象
* GtkObject *gtk_adjustment_new(gdouble value,调整对象的初始值,通常是最高或者最低位置
* gdouble lower,调整对象能取得的最低值
* gdouble upper,用于分栏构件最底部或最右边的坐标
* gdouble step_increment,小步调整的值
* gdouble page_increment,大步调整的值
* gdouble page_size);分栏构件的可视区域
* */
adj1 = gtk_adjustment_new(0.0,0.0,101.0,0.1,1.0,1.0);
/*创建一个垂直比例控件*/
vscale = gtk_vscale_new(GTK_ADJUSTMENT(adj1));
scale_set_default_values(GTK_SCALE(vscale));
gtk_box_pack_start(GTK_BOX(box2),vscale,TRUE,TRUE,0);
gtk_widget_show(vscale);
/*创建一个纵向组装盒子,并加入2个水平比例控件*/
box3 = gtk_vbox_new(FALSE,10);
gtk_box_pack_start(GTK_BOX(box2),box3,TRUE,TRUE,0);
gtk_widget_show(box3);
/*创建一个水平比例控件*/
hscale = gtk_hscale_new(GTK_ADJUSTMENT(adj1));
/*设置控件的宽度和高度*/
gtk_widget_set_size_request(GTK_WIDGET(hscale),200,-1);
scale_set_default_values(GTK_SCALE(hscale));
gtk_box_pack_start(GTK_BOX(box3),hscale,TRUE,TRUE,0);
gtk_widget_show(hscale);
/*创建一个滑动条*/
scrollbar = gtk_hscrollbar_new(GTK_ADJUSTMENT(adj1));
/*注意:
* 这导致当滚动条移动时,比例构件总是连续更新
* */
gtk_range_set_update_policy(GTK_RANGE(scrollbar),GTK_UPDATE_CONTINUOUS);
gtk_box_pack_start(GTK_BOX(box3),scrollbar,TRUE,TRUE,0);
gtk_widget_show(scrollbar);
box2 = gtk_hbox_new(FALSE,10);
gtk_container_set_border_width(GTK_CONTAINER(box2),10);
gtk_box_pack_start(GTK_BOX(box1),box2,TRUE,TRUE,0);
gtk_widget_show(box2);
/*用一个复选框控制是否显示比较构件的当前的数值*/
button = gtk_check_button_new_with_label("Display value on scale widgets");
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button),TRUE);
g_signal_connect(G_OBJECT(button),"toggled",G_CALLBACK(cb_draw_value),NULL);
gtk_box_pack_start(GTK_BOX(box2),button,TRUE,TRUE,0);
gtk_widget_show(button);
box2 = gtk_hbox_new(FALSE,10);
gtk_container_set_border_width(GTK_CONTAINER(box2),10);
/*用一个选项菜单以改变显示值的位置*/
label = gtk_label_new("Scale Value Position");
gtk_box_pack_start(GTK_BOX(box2),label,FALSE,FALSE,0);
gtk_widget_show(label);
opt = gtk_option_menu_new();
menu = gtk_menu_new();
item = make_menu_item("TOP",G_CALLBACK(cb_pos_menu_select),GINT_TO_POINTER(GTK_POS_TOP));
gtk_menu_shell_append(GTK_MENU_SHELL(menu),item);
item = make_menu_item("BUTTOM",G_CALLBACK(cb_pos_menu_select),GINT_TO_POINTER(GTK_POS_BOTTOM));
gtk_menu_shell_append(GTK_MENU_SHELL(menu),item);
item = make_menu_item("RIGHT",G_CALLBACK(cb_pos_menu_select),GINT_TO_POINTER(GTK_POS_RIGHT));
gtk_menu_shell_append(GTK_MENU_SHELL(menu),item);
item = make_menu_item("LEFT",G_CALLBACK(cb_pos_menu_select),GINT_TO_POINTER(GTK_POS_LEFT));
gtk_menu_shell_append(GTK_MENU_SHELL(menu),item);
gtk_option_menu_set_menu(GTK_OPTION_MENU(opt),menu);
gtk_box_pack_start(GTK_BOX(box2),opt,TRUE,TRUE,0);
gtk_widget_show(opt);
gtk_box_pack_start(GTK_BOX(box1),box2,TRUE,TRUE,0);
gtk_widget_show(box2);
box2 = gtk_hbox_new(FALSE,10);
gtk_container_set_border_width(GTK_CONTAINER(box2),0);
/*设置比例构件的更新方式*/
label = gtk_label_new("Scale Update Policy:");
gtk_box_pack_start(GTK_BOX(box2),label,TRUE,TRUE,0);
gtk_widget_show(label);
opt = gtk_option_menu_new();
menu = gtk_menu_new();
item = make_menu_item("Continuous",G_CALLBACK(cb_update_menu_select),GINT_TO_POINTER(GTK_UPDATE_CONTINUOUS));
gtk_menu_shell_append(GTK_MENU_SHELL(menu),item);
item = make_menu_item("Discontinuous",G_CALLBACK(cb_update_menu_select),GINT_TO_POINTER(GTK_UPDATE_DISCONTINUOUS));
gtk_menu_shell_append(GTK_MENU_SHELL(menu),item);
item = make_menu_item("Delayed",G_CALLBACK(cb_update_menu_select),GINT_TO_POINTER(GTK_UPDATE_DELAYED));
gtk_menu_shell_append(GTK_MENU_SHELL(menu),item);
gtk_option_menu_set_menu(GTK_OPTION_MENU(opt),menu);
gtk_box_pack_start(GTK_BOX(box2),opt,TRUE,TRUE,0);
gtk_widget_show(opt);
gtk_box_pack_start(GTK_BOX(box1),box2,TRUE,TRUE,0);
gtk_widget_show(box2);
box2 = gtk_hbox_new(FALSE,10);
gtk_container_set_border_width(GTK_CONTAINER(box2),10);
/*用于调整比例构件小数位数*/
label = gtk_label_new("Scale Digits:");
gtk_box_pack_start(GTK_BOX(box2),label,FALSE,FALSE,0);
gtk_widget_show(label);
adj2 = gtk_adjustment_new(1.0,0.0,5.0,1.0,1.0,0.0);
g_signal_connect(G_OBJECT(adj2),"value_changed",G_CALLBACK(cb_digits_scale),NULL);
scale = gtk_hscale_new(GTK_ADJUSTMENT(adj2));
gtk_scale_set_digits(GTK_SCALE(scale),0);
gtk_box_pack_start(GTK_BOX(box2),scale,TRUE,TRUE,0);
gtk_widget_show(scale);
gtk_box_pack_start(GTK_BOX(box1),box2,TRUE,TRUE,0);
gtk_widget_show(box2);
box2 = gtk_hbox_new(FALSE,10);
gtk_container_set_border_width(GTK_CONTAINER(box2),10);
/*用于调整水平比例构件滚动条的page size */
label = gtk_label_new("Scrollbar Page Size:");
gtk_box_pack_start(GTK_BOX(box2),label,FALSE,FALSE,0);
gtk_widget_show(label);
adj2 = gtk_adjustment_new(1.0,1.0,110.0,1.0,1.0,0.0);
g_signal_connect(G_OBJECT(adj2),"value_changed",G_CALLBACK(cb_page_size),adj1);
scale = gtk_hscale_new(GTK_ADJUSTMENT(adj2));
gtk_scale_set_digits(GTK_SCALE(scale),0);
gtk_box_pack_start(GTK_BOX(box2),scale,TRUE,TRUE,0);
gtk_widget_show(scale);
gtk_box_pack_start(GTK_BOX(box1),box2,TRUE,TRUE,0);
gtk_widget_show(box2);
/*创建一个分割线*/
separator = gtk_hseparator_new();
gtk_box_pack_start(GTK_BOX(box1),separator,FALSE,TRUE,0);
gtk_widget_show(separator);
box2 = gtk_vbox_new(FALSE,10);
gtk_container_set_border_width(GTK_CONTAINER(box2),10);
gtk_box_pack_start(GTK_BOX(box1),box2,FALSE,TRUE,0);
gtk_widget_show(box2);
/*创建一个退出按钮*/
button = gtk_button_new_with_label("Quit");
g_signal_connect_swapped(G_OBJECT(button),"clicked",G_CALLBACK(gtk_main_quit),NULL);
gtk_box_pack_start(GTK_BOX(box2),button,TRUE,TRUE,0);
/*将退出按钮固定为缺省,只要按回车键就能触发*/
GTK_WIDGET_SET_FLAGS(button,GTK_CAN_DEFAULT);
gtk_widget_grab_default(button);
gtk_widget_show(button);
gtk_widget_show(window);
}
int main(int argc,char *argv[])
{
gtk_init(&argc,&argv);
/*创建范围控件*/
create_range_controls();
gtk_main();
return 0;
}
~~~
执行后:
![](https://box.kancloud.cn/2016-08-24_57bd77974917b.jpg)