maride/guacamole-spice-protocol
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Proper handling of new rows and removed rows.

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This commit is contained in:
Michael Jumper 2013-05-02 03:18:10 -07:00
parent 22ee486019
commit ac52c8fb64
1 changed files with 67 additions and 0 deletions
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67
protocols/ssh/src/terminal.c
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@ -414,10 +414,77 @@ void guac_terminal_set_columns(guac_terminal* terminal, int row,
void guac_terminal_resize(guac_terminal* term, int width, int height) {
/* If height is decreasing, shift display up */
if (height < term->term_height) {
int shift_amount;
/* Get number of rows actually occupying terminal space */
int used_height = term->buffer->length;
if (used_height > term->term_height)
used_height = term->term_height;
shift_amount = used_height - height;
/* If the new terminal bottom covers N rows, shift up N rows */
if (shift_amount > 0) {
guac_terminal_display_copy_rows(term->display,
shift_amount, term->display->height - 1, -shift_amount);
/* Update buffer top and cursor row based on shift */
term->buffer->top += shift_amount;
term->cursor_row -= shift_amount;
}
}
/* Resize display */
guac_terminal_display_flush(term->display);
guac_terminal_display_resize(term->display, width, height);
/* If height is increasing, shift display down */
if (height > term->term_height) {
/* If undisplayed rows exist in the buffer, shift them into view */
if (term->term_height < term->buffer->length) {
/* If the new terminal bottom reveals N rows, shift down N rows */
int shift_amount = height - term->term_height;
/* The maximum amount we can shift is the number of undisplayed rows */
int max_shift = term->buffer->length - term->term_height;
if (shift_amount > max_shift)
shift_amount = max_shift;
/* Update buffer top and cursor row based on shift */
term->buffer->top -= shift_amount;
term->cursor_row += shift_amount;
/* If scrolled enough, use scroll to fulfill entire resize */
if (term->scroll_offset >= shift_amount)
term->scroll_offset -= shift_amount;
/* Otherwise, fulfill with as much scroll as possible */
else {
/* Attempt to fulfill part with scroll */
shift_amount -= term->scroll_offset;
term->scroll_offset = 0;
/* If anything remains, move screen as necessary */
if (shift_amount > 0)
guac_terminal_display_copy_rows(term->display,
0, term->display->height - shift_amount - 1, shift_amount);
}
} /* end if undisplayed rows exist */
}
/* Commit new dimensions */
term->term_width = width;
term->term_height = height;