#include <gtk/gtk.h>
typedef struct _ProgressData {
GtkWidget *window;
GtkWidget *pbar;
int timer;
gboolean activity_mode;
} ProgressData;
/* 更新进度条，这样就能够看到进度条的移动 */
gint progress_timeout( gpointer data )
{
ProgressData *pdata = (ProgressData *)data;
gdouble new_val;
if (pdata->activity_mode)
gtk_progress_bar_pulse (GTK_PROGRESS_BAR (pdata->pbar));
else
{
/* 使用在调整对象中设置的取值范围计算进度条的值 */
new_val = gtk_progress_bar_get_fraction (GTK_PROGRESS_BAR (pdata->pbar)) + 0.01;
if (new_val > 1.0)
new_val = 0.0;
/* 设置进度条的新值 */
gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (pdata->pbar), new_val);
}
/* 这是一个timeout函数，返回 TRUE，这样它就能够继续被调用 */
return TRUE;
}
/* 回调函数，切换在进度条你的滑槽上的文本显示 */
void toggle_show_text( GtkWidget *widget,
ProgressData *pdata )
{
const gchar *text;
text = gtk_progress_bar_get_text (GTK_PROGRESS_BAR (pdata->pbar));
if (text && *text)
gtk_progress_bar_set_text (GTK_PROGRESS_BAR (pdata->pbar), "");
else
gtk_progress_bar_set_text (GTK_PROGRESS_BAR (pdata->pbar), "some text");
}
/* 回调函数，切换进度条的活动模式 */
void toggle_activity_mode( GtkWidget *widget,
ProgressData *pdata )
{
pdata->activity_mode = !pdata->activity_mode;
if (pdata->activity_mode)
gtk_progress_bar_pulse (GTK_PROGRESS_BAR (pdata->pbar));
else
gtk_progress_bar_set_fraction (GTK_PROGRESS_BAR (pdata->pbar), 0.0);
}
/* 回调函数，切换进度条的移动方向 */
void toggle_orientation( GtkWidget *widget,
ProgressData *pdata )
{
switch (gtk_progress_bar_get_orientation (GTK_PROGRESS_BAR (pdata->pbar))) {
case GTK_PROGRESS_LEFT_TO_RIGHT:
gtk_progress_bar_set_orientation (GTK_PROGRESS_BAR (pdata->pbar),
GTK_PROGRESS_RIGHT_TO_LEFT);
break;
case GTK_PROGRESS_RIGHT_TO_LEFT:
gtk_progress_bar_set_orientation (GTK_PROGRESS_BAR (pdata->pbar),
GTK_PROGRESS_LEFT_TO_RIGHT);
break;
default:
// 什么也不做
}
}
/* 清除分配的内存，删除定时器(timer) */
void destroy_progress( GtkWidget *widget,
ProgressData *pdata)
{
gtk_timeout_remove (pdata->timer);
pdata->timer = 0;
pdata->window = NULL;
g_free (pdata);
gtk_main_quit ();
}
int main( int argc,
char *argv[])
{
ProgressData *pdata;
GtkWidget *align;
GtkWidget *separator;
GtkWidget *table;
GtkWidget *button;
GtkWidget *check;
GtkWidget *vbox;
gtk_init (&argc, &argv);
/* 为传递到回调函数中的数据分配内存 */
pdata = g_malloc (sizeof (ProgressData));
pdata->window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_resizable (GTK_WINDOW (pdata->window), TRUE);
g_signal_connect (G_OBJECT (pdata->window), "destroy",
G_CALLBACK (destroy_progress),
pdata);
gtk_window_set_title (GTK_WINDOW (pdata->window), "GtkProgressBar");
gtk_container_set_border_width (GTK_CONTAINER (pdata->window), 0);
vbox = gtk_vbox_new (FALSE, 5);
gtk_container_set_border_width (GTK_CONTAINER (vbox), 10);
gtk_container_add (GTK_CONTAINER (pdata->window), vbox);
gtk_widget_show (vbox);
/* 创建一个居中对齐的对象 */
align = gtk_alignment_new (0.5, 0.5, 0, 0);
gtk_box_pack_start (GTK_BOX (vbox), align, FALSE, FALSE, 5);
gtk_widget_show (align);
/* 创建进度条 */
pdata->pbar = gtk_progress_bar_new ();
gtk_container_add (GTK_CONTAINER (align), pdata->pbar);
gtk_widget_show (pdata->pbar);
/* 加一个定时器(timer)，以更新进度条的值 */
pdata->timer = gtk_timeout_add (100, progress_timeout, pdata);
separator = gtk_hseparator_new ();
gtk_box_pack_start (GTK_BOX (vbox), separator, FALSE, FALSE, 0);
gtk_widget_show (separator);
/* 行数、列数、同质性(homogeneous) */
table = gtk_table_new (2, 2, FALSE);
gtk_box_pack_start (GTK_BOX (vbox), table, FALSE, TRUE, 0);
gtk_widget_show (table);
/* 添加一个复选按钮，以选择是否显示在滑槽里的文本 */
check = gtk_check_button_new_with_label ("Show text");
gtk_table_attach (GTK_TABLE (table), check, 0, 1, 0, 1,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL,
5, 5);
g_signal_connect (G_OBJECT (check), "clicked",
G_CALLBACK (toggle_show_text),
pdata);
gtk_widget_show (check);
/* 添加一个复选按钮，切换活动状态 */
check = gtk_check_button_new_with_label ("Activity mode");
gtk_table_attach (GTK_TABLE (table), check, 0, 1, 1, 2,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL,
5, 5);
g_signal_connect (G_OBJECT (check), "clicked",
G_CALLBACK (toggle_activity_mode),
pdata);
gtk_widget_show (check);
/* 添加一个复选按钮，切换移动方向 */
check = gtk_check_button_new_with_label ("Right to Left");
gtk_table_attach (GTK_TABLE (table), check, 0, 1, 2, 3,
GTK_EXPAND | GTK_FILL, GTK_EXPAND | GTK_FILL,
5, 5);
g_signal_connect (G_OBJECT (check), "clicked",
G_CALLBACK (toggle_orientation),
pdata);
gtk_widget_show (check);
/* 添加一个按钮，用来退出应用程序 */
button = gtk_button_new_with_label ("close");
g_signal_connect_swapped (G_OBJECT (button), "clicked",
G_CALLBACK (gtk_widget_destroy),
pdata->window);
gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);
/* 将按钮设置为能缺省的构件 */
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
/* 将缺省焦点设置到这个按钮上，使之成为缺省按钮，只要按回车键
* 就相当于点击了这个按钮 */
//译者注： 能缺省的构件在获取焦点后成为缺省构件,用户按方向键等可以切换焦点。
gtk_widget_grab_default (button);
gtk_widget_show (button);
gtk_widget_show (pdata->window);
gtk_main ();
return 0;
}
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