《Linux 程序设计入门》 第四版 §6.6 子窗口

子窗口

       子窗口的创建和删除：

#include

WINDOW *subwin(WINDOW *parent, int num_of_lines, int num_of_cols,

int start_y, int start_x);

int delwin(WINDOW *window_to_delete);

 

         子窗口和新窗口的区别：子窗口不存储屏幕字符集，而是共享父窗口的，所以子窗口实际上改变了父窗口的屏幕，子窗口清除后，屏幕依旧没有变化。

         子窗口一般用于滚动。

         刷新屏幕前，父窗口必须调用touchwin。

 

实例：

# cat subscl.c

/*  First, the initial code section. The base window display is initialized with some text.  */

 

#include

#include

#include

 

int main()

{

    WINDOW *sub_window_ptr;

    int x_loop;

    int y_loop;

    int counter;

    char a_letter = '1';

 

    initscr();

 

    for (y_loop = 0; y_loop < LINES - 1; y_loop++) {

        for (x_loop = 0; x_loop < COLS - 1; x_loop++) {

            mvwaddch(stdscr, y_loop, x_loop, a_letter);

            a_letter++;

            if (a_letter > '9') a_letter = '1';

        }

    }

 

 

/*  We now create the new scrolling subwindow

    and, as advised, we must 'touch' the parent window before refreshing the screen.  */

 

    sub_window_ptr = subwin(stdscr, 10, 20, 10, 10);

    scrollok(sub_window_ptr, 1);

 

    touchwin(stdscr);

    refresh();

    sleep(1);

 

/*  Then we erase the contents of the subwindow, print text to it and refresh it.

    The scrolling text is achieved by a loop.  */

 

    werase(sub_window_ptr);

    mvwprintw(sub_window_ptr, 2, 0, "%s", "This window will now scroll");

    wrefresh(sub_window_ptr);

    sleep(1);

 

    for (counter = 1; counter < 10; counter++) {

        wprintw(sub_window_ptr, "%s", "This text is both wrapping and \

                    scrolling.");

        wrefresh(sub_window_ptr);

        sleep(1);

    }

 

/*  Having finished this loop, we delete the subwindow. Then we refresh the base screen.  */

 

    delwin(sub_window_ptr);

 

    touchwin(stdscr);

    refresh();

    sleep(1);

 

    endwin();

    exit(EXIT_SUCCESS);

}