日历 Calendar@GTK+ 2.0 中文教程连载
2010-12-21 15:06
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日历 Calendar
日历(Calendar)构件是显示和获取每月日期等信息的高效方法。它是一个很容易创建和使用的构件。创建日历构件的方法和其它构件的类似：
GtkWidget *gtk_calendar_new( void ); |
void gtk_calendar_freeze( GtkCalendar *Calendar ); void gtk_calendar_thaw( GtkCalendar *Calendar ); |
日历构件有几个选项，可以用来改变构件的外观和操作方式。使用下面的函数可以改变这些选项：
void gtk_calendar_display_options( GtkCalendar *calendar, GtkCalendarDisplayOptions flags ); |
参数可以将下面的五种选项中的一个或者多个用逻辑位或(|)操作符组合起来：
GTK_CALENDAR_SHOW_HEADING
这个选项指定在绘制日历构件时，应该显示月份和年份。
GTK_CALENDAR_SHOW_DAY_NAMES
这个选项指定用三个字母的缩写显示每一天是星期几(比如Mon、Tue等)。
GTK_CALENDAR_NO_MONTH_CHANGE
这个选项指定用户不应该也不能够改变显示的月份。如果只想显示某个特定的月份，则可以使用这个选项。比如，在窗口上同时为一年的12个月分别设置一个日历构件时。
GTK_CALENDAR_SHOW_WEEK_NUMBERS
这个选项指定应该在日历的左边显示每一周在全年的周序号(例如；1月1日是第1周，12月31日是第52周)。
GTK_CALENDAR_WEEK_START_MONDAY
这个选项指定在日历构件中每一周是从星期一开始而不是从星期天开始。缺省设置是从星期天开始。此选项只影响日期在构件中从左到右的排列顺序。
下面的函数用于设置当前要显示的日期：
gint gtk_calendar_select_month( GtkCalendar *calendar, guint month, guint year ); void gtk_calendar_select_day( GtkCalendar *calendar, guint day ); |
的返回值是一个布尔值，指示设置是否成功。
使用gtk_calendar_select_day()
函数，如果指定的日期是合法的，会在日历构件中选中该日期。如果day
参数的值是0，将清除当前的选择。
除了可以选中一个日期以外，在一个月中可以有任意个日期被“标记”。被“标记”的日期会在日历构件中高亮显示。下面的函数用于标记日期和取消标记：
gint gtk_calendar_mark_day( GtkCalendar *calendar, guint day); gint gtk_calendar_unmark_day( GtkCalendar *calendar, guint day); void gtk_calendar_clear_marks( GtkCalendar *calendar); |
GtkCalendar *calendar; calendar = gtk_calendar_new (); ... /* 当月7日被标记了吗？ */ if (calendar->marked_date[7-1]) /* 若执行此处的代码，表明7日已经被标记 */ |
日历构件的最后一个函数用于取得当前选中的日/月/年值：
void gtk_calendar_get_date( GtkCalendar *calendar, guint *year, guint *month, guint *day ); |
类型的变量，再把变量地址传递给函数。所需要的返回值就存放在这几个变量中。如果将某一个参数设置为NULL
，则不返回该值。
日历构件能够引发许多信号，用于指示日期被选中以及选择发生的变化。信号的意义很容易理解。信号名称如下：
month_changed
day_selected
day_selected_double_click
prev_month
next_month
prev_year
next_year
下面是一个日历构件的示例，运用了上面介绍的各项特性。
/* GTK - GIMP工具包
* 版权 (C) 1995-1997 Peter Mattis, Spencer Kimball 和 Josh MacDonald 所有
*
* 本程序是自由软件。你可以在自由软件基金发布的 GNU GPL 的条款下重新分发
* 或修改它。GPL 可以使用版本 2 或(由你选择)任何随后的版本。
*
* 本程序分发的目的是它可能对其他人有用，但不提供任何的担保，包括隐含的
* 和适合特定用途的保证。请查阅GNU通用公共许可证获得详细的信息。
*
* 你应该已经随该软件一起收到一份GNU通用公共许可。如果还没有，请写信给
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <gtk/gtk.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#define DEF_PAD 10
#define DEF_PAD_SMALL 5
#define TM_YEAR_BASE 1900
typedef struct _CalendarData {
GtkWidget *flag_checkboxes[5];
gboolean settings[5];
gchar *font;
GtkWidget *font_dialog;
GtkWidget *window;
GtkWidget *prev2_sig;
GtkWidget *prev_sig;
GtkWidget *last_sig;
GtkWidget *month;
} CalendarData;
enum {
calendar_show_header,
calendar_show_days,
calendar_month_change,
calendar_show_week,
calendar_monday_first
};
/*
* GtkCalendar 日历构件
*/
void calendar_date_to_string( CalendarData *data,
char *buffer,
gint buff_len )
{
struct tm tm;
time_t time;
memset (&tm, 0, sizeof (tm));
gtk_calendar_get_date (GTK_CALENDAR (data->window),
&tm.tm_year, &tm.tm_mon, &tm.tm_mday);
tm.tm_year -= TM_YEAR_BASE;
time = mktime (&tm);
strftime (buffer, buff_len-1, "%x", gmtime (&time));
}
void calendar_set_signal_strings( char *sig_str,
CalendarData *data)
{
const gchar *prev_sig;
prev_sig = gtk_label_get_text (GTK_LABEL (data->prev_sig));
gtk_label_set_text (GTK_LABEL (data->prev2_sig), prev_sig);
prev_sig = gtk_label_get_text (GTK_LABEL (data->last_sig));
gtk_label_set_text (GTK_LABEL (data->prev_sig), prev_sig);
gtk_label_set_text (GTK_LABEL (data->last_sig), sig_str);
}
void calendar_month_changed( GtkWidget *widget,
CalendarData *data )
{
char buffer[256] = "month_changed: ";
calendar_date_to_string (data, buffer+15, 256-15);
calendar_set_signal_strings (buffer, data);
}
void calendar_day_selected( GtkWidget *widget,
CalendarData *data )
{
char buffer[256] = "day_selected: ";
calendar_date_to_string (data, buffer+14, 256-14);
calendar_set_signal_strings (buffer, data);
}
void calendar_day_selected_double_click( GtkWidget *widget,
CalendarData *data )
{
struct tm tm;
char buffer[256] = "day_selected_double_click: ";
calendar_date_to_string (data, buffer+27, 256-27);
calendar_set_signal_strings (buffer, data);
memset (&tm, 0, sizeof (tm));
gtk_calendar_get_date (GTK_CALENDAR (data->window),
&tm.tm_year, &tm.tm_mon, &tm.tm_mday);
tm.tm_year -= TM_YEAR_BASE;
if (GTK_CALENDAR (data->window)->marked_date[tm.tm_mday-1] == 0)
{
gtk_calendar_mark_day (GTK_CALENDAR (data->window), tm.tm_mday);
}
else
{
gtk_calendar_unmark_day (GTK_CALENDAR (data->window), tm.tm_mday);
}
}
void calendar_prev_month( GtkWidget *widget,
CalendarData *data )
{
char buffer[256] = "prev_month: ";
calendar_date_to_string (data, buffer+12, 256-12);
calendar_set_signal_strings (buffer, data);
}
void calendar_next_month( GtkWidget *widget,
CalendarData *data )
{
char buffer[256] = "next_month: ";
calendar_date_to_string (data, buffer+12, 256-12);
calendar_set_signal_strings (buffer, data);
}
void calendar_prev_year( GtkWidget *widget,
CalendarData *data )
{
char buffer[256] = "prev_year: ";
calendar_date_to_string (data, buffer+11, 256-11);
calendar_set_signal_strings (buffer, data);
}
void calendar_next_year( GtkWidget *widget,
CalendarData *data )
{
char buffer[256] = "next_year: ";
calendar_date_to_string (data, buffer+11, 256-11);
calendar_set_signal_strings (buffer, data);
}
void calendar_set_flags( CalendarData *calendar )
{
gint i;
gint options = 0;
for (i = 0; i < 5; i++)
if (calendar->settings[i])
{
options=options + (1<<i);
}
if (calendar->window)
gtk_calendar_display_options (GTK_CALENDAR (calendar->window), options);
}
void calendar_toggle_flag( GtkWidget *toggle,
CalendarData *calendar )
{
gint i;
gint j;
j = 0;
for (i = 0; i < 5; i++)
if (calendar->flag_checkboxes[i] == toggle)
j = i;
calendar->settings[j] = !calendar->settings[j];
calendar_set_flags (calendar);
}
void calendar_font_selection_ok( GtkWidget *button,
CalendarData *calendar )
{
GtkStyle *style;
PangoFontDescription *font_desc;
calendar->font = gtk_font_selection_dialog_get_font_name (
GTK_FONT_SELECTION_DIALOG (calendar->font_dialog));
if (calendar->window)
{
font_desc = pango_font_description_from_string (calendar->font);
if (font_desc)
{
style = gtk_style_copy (gtk_widget_get_style (calendar->window));
style->font_desc = font_desc;
gtk_widget_set_style (calendar->window, style);
}
}
}
void calendar_select_font( GtkWidget *button,
CalendarData *calendar )
{
GtkWidget *window;
if (!calendar->font_dialog) {
window = gtk_font_selection_dialog_new ("Font Selection Dialog");
g_return_if_fail (GTK_IS_FONT_SELECTION_DIALOG (window));
calendar->font_dialog = window;
gtk_window_set_position (GTK_WINDOW (window), GTK_WIN_POS_MOUSE);
g_signal_connect (G_OBJECT (window), "destroy",
G_CALLBACK (gtk_widget_destroyed),
&calendar->font_dialog);
g_signal_connect (G_OBJECT (GTK_FONT_SELECTION_DIALOG (window)->ok_button),
"clicked", G_CALLBACK (calendar_font_selection_ok),
calendar);
g_signal_connect_swapped (G_OBJECT (GTK_FONT_SELECTION_DIALOG (window)->cancel_button),
"clicked",
G_CALLBACK (gtk_widget_destroy),
calendar->font_dialog);
}
window=calendar->font_dialog;
if (!GTK_WIDGET_VISIBLE (window))
gtk_widget_show (window);
else
gtk_widget_destroy (window);
}
void create_calendar()
{
GtkWidget *window;
GtkWidget *vbox, *vbox2, *vbox3;
GtkWidget *hbox;
GtkWidget *hbbox;
GtkWidget *calendar;
GtkWidget *toggle;
GtkWidget *button;
GtkWidget *frame;
GtkWidget *separator;
GtkWidget *label;
GtkWidget *bbox;
static CalendarData calendar_data;
gint i;
struct {
char *label;
} flags[] =
{
{ "Show Heading" },
{ "Show Day Names" },
{ "No Month Change" },
{ "Show Week Numbers" },
{ "Week Start Monday" }
};
calendar_data.window = NULL;
calendar_data.font = NULL;
calendar_data.font_dialog = NULL;
for (i = 0; i < 5; i++) {
calendar_data.settings[i] = 0;
}
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_window_set_title (GTK_WINDOW (window), "GtkCalendar Example");
gtk_container_set_border_width (GTK_CONTAINER (window), 5);
g_signal_connect (G_OBJECT (window), "destroy",
G_CALLBACK (gtk_main_quit),
NULL);
g_signal_connect (G_OBJECT (window), "delete-event",
G_CALLBACK (gtk_false),
NULL);
gtk_window_set_resizable (GTK_WINDOW (window), FALSE);
vbox = gtk_vbox_new (FALSE, DEF_PAD);
gtk_container_add (GTK_CONTAINER (window), vbox);
/*
* 顶级窗口，其中包含日历构件，设置日历各参数的复选按钮和设置字体的按钮
*/
hbox = gtk_hbox_new (FALSE, DEF_PAD);
gtk_box_pack_start (GTK_BOX (vbox), hbox, TRUE, TRUE, DEF_PAD);
hbbox = gtk_hbutton_box_new ();
gtk_box_pack_start (GTK_BOX (hbox), hbbox, FALSE, FALSE, DEF_PAD);
gtk_button_box_set_layout (GTK_BUTTON_BOX(hbbox), GTK_BUTTONBOX_SPREAD);
gtk_box_set_spacing (GTK_BOX (hbbox), 5);
/* 日历构件 */
frame = gtk_frame_new ("Calendar");
gtk_box_pack_start (GTK_BOX (hbbox), frame, FALSE, TRUE, DEF_PAD);
calendar=gtk_calendar_new ();
calendar_data.window = calendar;
calendar_set_flags (&calendar_data);
gtk_calendar_mark_day (GTK_CALENDAR (calendar), 19);
gtk_container_add( GTK_CONTAINER (frame), calendar);
g_signal_connect (G_OBJECT (calendar), "month_changed",
G_CALLBACK (calendar_month_changed),
&calendar_data);
g_signal_connect (G_OBJECT (calendar), "day_selected",
G_CALLBACK (calendar_day_selected),
&calendar_data);
g_signal_connect (G_OBJECT (calendar), "day_selected_double_click",
G_CALLBACK (calendar_day_selected_double_click),
&calendar_data);
g_signal_connect (G_OBJECT (calendar), "prev_month",
G_CALLBACK (calendar_prev_month),
&calendar_data);
g_signal_connect (G_OBJECT (calendar), "next_month",
G_CALLBACK (calendar_next_month),
&calendar_data);
g_signal_connect (G_OBJECT (calendar), "prev_year",
G_CALLBACK (calendar_prev_year),
&calendar_data);
g_signal_connect (G_OBJECT (calendar), "next_year",
G_CALLBACK (calendar_next_year),
&calendar_data);
separator = gtk_vseparator_new ();
gtk_box_pack_start (GTK_BOX (hbox), separator, FALSE, TRUE, 0);
vbox2 = gtk_vbox_new (FALSE, DEF_PAD);
gtk_box_pack_start (GTK_BOX (hbox), vbox2, FALSE, FALSE, DEF_PAD);
/* 创建一个框架，放入设置各种参数的复选按钮 */
frame = gtk_frame_new ("Flags");
gtk_box_pack_start (GTK_BOX (vbox2), frame, TRUE, TRUE, DEF_PAD);
vbox3 = gtk_vbox_new (TRUE, DEF_PAD_SMALL);
gtk_container_add (GTK_CONTAINER (frame), vbox3);
for (i = 0; i < 5; i++)
{
toggle = gtk_check_button_new_with_label (flags[i].label);
g_signal_connect (G_OBJECT (toggle),
"toggled",
G_CALLBACK (calendar_toggle_flag),
&calendar_data);
gtk_box_pack_start (GTK_BOX (vbox3), toggle, TRUE, TRUE, 0);
calendar_data.flag_checkboxes[i] = toggle;
}
/* 创建一个按钮，用于设置字体 */
button = gtk_button_new_with_label ("Font...");
g_signal_connect (G_OBJECT (button),
"clicked",
G_CALLBACK (calendar_select_font),
&calendar_data);
gtk_box_pack_start (GTK_BOX (vbox2), button, FALSE, FALSE, 0);
/*
* 创建“信号-事件”部分
*/
frame = gtk_frame_new ("Signal events");
gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, DEF_PAD);
vbox2 = gtk_vbox_new (TRUE, DEF_PAD_SMALL);
gtk_container_add (GTK_CONTAINER (frame), vbox2);
hbox = gtk_hbox_new (FALSE, 3);
gtk_box_pack_start (GTK_BOX (vbox2), hbox, FALSE, TRUE, 0);
label = gtk_label_new ("Signal:");
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, TRUE, 0);
calendar_data.last_sig = gtk_label_new ("");
gtk_box_pack_start (GTK_BOX (hbox), calendar_data.last_sig, FALSE, TRUE, 0);
hbox = gtk_hbox_new (FALSE, 3);
gtk_box_pack_start (GTK_BOX (vbox2), hbox, FALSE, TRUE, 0);
label = gtk_label_new ("Previous signal:");
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, TRUE, 0);
calendar_data.prev_sig = gtk_label_new ("");
gtk_box_pack_start (GTK_BOX (hbox), calendar_data.prev_sig, FALSE, TRUE, 0);
hbox = gtk_hbox_new (FALSE, 3);
gtk_box_pack_start (GTK_BOX (vbox2), hbox, FALSE, TRUE, 0);
label = gtk_label_new ("Second previous signal:");
gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, TRUE, 0);
calendar_data.prev2_sig = gtk_label_new ("");
gtk_box_pack_start (GTK_BOX (hbox), calendar_data.prev2_sig, FALSE, TRUE, 0);
bbox = gtk_hbutton_box_new ();
gtk_box_pack_start (GTK_BOX (vbox), bbox, FALSE, FALSE, 0);
gtk_button_box_set_layout (GTK_BUTTON_BOX (bbox), GTK_BUTTONBOX_END);
button = gtk_button_new_with_label ("Close");
g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (gtk_main_quit),
NULL);
gtk_container_add (GTK_CONTAINER (bbox), button);
GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
gtk_widget_grab_default (button);
gtk_widget_show_all (window);
}
int main(int argc,
char *argv[] )
{
gtk_init (&argc, &argv);
create_calendar ();
gtk_main ();
return 0;
} |
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