Thread: Ncurses: Unable to move windows with mvwin !

Hello friends,

Please have a look at this code which I googled across internet:

Code:

/*

  CURWIN1.C
  =========
  (c) Copyright Paul Griffiths 1999
  Email: [email protected]

  Moving windows with ncurses.

*/


#include <stdlib.h>
#include <stdio.h>
#include <curses.h>


int main(void) {
    
    WINDOW * mainwin, * childwin;
    int      ch;


    /*  Set the dimensions and initial
    position for our child window   */

    int      width = 23, height = 7;
    int      rows  = 25, cols   = 80;
    int      x = (cols - width)  / 2;
    int      y = (rows - height) / 2;


    /*  Initialize ncurses  */

    if ( (mainwin = initscr()) == NULL ) {
    fprintf(stderr, "Error initialising ncurses.\n");
    exit(EXIT_FAILURE);
    }
    

    /*  Switch of echoing and enable keypad (for arrow keys)  */

    noecho();
    keypad(stdscr, TRUE);


    /*  Make our child window, and add
    a border and some text to it.   */

    childwin = subwin(mainwin, height, width, y, x);
    box(childwin, 0, 0);
    mvwaddstr(childwin, 1, 4, "Move the window");
    mvwaddstr(childwin, 2, 2, "with the arrow keys");
    mvwaddstr(childwin, 3, 6, "or HOME/END");
    mvwaddstr(childwin, 5, 3, "Press 'q' to quit");

    refresh();


    /*  Loop until user hits 'q' to quit  */

    while ( (ch = getch()) != 'q' ) {

    switch ( ch ) {

    case KEY_UP:
        if ( y > 0 )
        --y;
        break;

    case KEY_DOWN:
        if ( y < (rows - height) )
        ++y;
        break;

    case KEY_LEFT:
        if ( x > 0 )
        --x;
        break;

    case KEY_RIGHT:
        if ( x < (cols - width) )
        ++x;
        break;

    case KEY_HOME:
        x = 0;
        y = 0;
        break;

    case KEY_END:
        x = (cols - width);
        y = (rows - height);
        break;

    }

    mvwin(childwin, y, x);
    }


    /*  Clean up after ourselves  */

    delwin(childwin);
    delwin(mainwin);
    endwin();
    refresh();

    return EXIT_SUCCESS;
}

I am unable to move the subwin from the arrow keys. Please tell me where I am wrong. Actually, Even with my personal code the sub windows are not moving. Here is my code:

Code:

void
move_window_center(WINDOW *parent, WINDOW *child)
{
    int p_y, p_width;
    int c_y, c_width;
    int indent;
    
    getmaxyx(parent, p_y, p_width);
    (void) p_y;
    
    getmaxyx(child, c_y, c_width);
    (void) c_y;

    indent = p_width - c_width;
    indent /= 2;
    
    mvwin(child, 0, indent);
    wrefresh(child);
}

Originally Posted by claudiu

This should be moved to the Windows forum.

Hello,

I think the post is in correct location because its question with ncurses for linux (ubuntu) and its completely a c programming problem.

Thanks.

> I am unable to move the subwin from the arrow keys
I don't see anything in your code that would accept arrow keys.

At any rate, have you tried compiling/running the code you found? I don't know Ncurses, but if the example is incorrect, there's no point using it.

You need to wrefresh after the mvwin. Also you might want to get rid of the box. It does not seem to be redrawn properly. And accodring to the documentation, moving a subwindow is not recommended (man mvwin). You might want to rethink your strategy.