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Scroll only scrolled region (fixes #31 github issue)

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This commit is contained in:
Keith Winstein
2012-03-18 15:19:42 -04:00
parent 483bfe9f0f
commit 231c181101
1 changed files with 30 additions and 6 deletions
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src/terminal/terminaldisplay.cc
+30 -6
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@@ -69,6 +69,11 @@ std::string Display::new_frame( bool initialized, const Framebuffer &last, const
if ( (!initialized)
|| (f.ds.get_width() != frame.last_frame.ds.get_width())
|| (f.ds.get_height() != frame.last_frame.ds.get_height()) ) {
/* reset scrolling region */
snprintf( tmp, 64, "\033[%d;%dr",
1, f.ds.get_height() );
frame.append( tmp );
/* clear screen */
frame.append( "\033[0m\033[H\033[2J" );
initialized = false;
@@ -113,26 +118,45 @@ std::string Display::new_frame( bool initialized, const Framebuffer &last, const
frame.y = scroll_height;
if ( lines_scrolled ) {
if ( frame.cursor_y != f.ds.get_height() - 1 ) {
frame.append_silent_move( f.ds.get_height() - 1, 0 );
}
if ( !(frame.current_rendition == initial_rendition()) ) {
frame.append( "\033[0m" );
frame.current_rendition = initial_rendition();
}
int top_margin = 0;
int bottom_margin = top_margin + lines_scrolled + scroll_height - 1;
assert( bottom_margin < f.ds.get_height() );
/* set scrolling region */
snprintf( tmp, 64, "\033[%d;%dr",
top_margin + 1, bottom_margin + 1);
frame.append( tmp );
/* go to bottom of scrolling region */
frame.append_silent_move( bottom_margin, 0 );
/* scroll */
for ( int i = 0; i < lines_scrolled; i++ ) {
frame.append( "\n" );
}
for ( int i = 0; i < f.ds.get_height(); i++ ) {
if ( i + lines_scrolled < f.ds.get_height() ) {
/* do the move in memory */
for ( int i = top_margin; i <= bottom_margin; i++ ) {
if ( i + lines_scrolled <= bottom_margin ) {
*(frame.last_frame.get_mutable_row( i )) = *(frame.last_frame.get_row( i + lines_scrolled ));
} else {
frame.last_frame.get_mutable_row( i )->reset( 0 );
}
}
/* reset scrolling region */
snprintf( tmp, 64, "\033[%d;%dr",
1, f.ds.get_height() );
frame.append( tmp );
/* make sure we know cursor position after scrolling region reset */
frame.append_silent_move( 0, 0 );
}
}
}