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Implement scrolling region

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This commit is contained in:
Keith Winstein
2011-01-31 20:11:25 -05:00
parent ed55c4c892
commit ea1f8621f1
4 changed files with 72 additions and 11 deletions
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terminalframebuffer.cpp
+43 -10
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@@ -57,6 +57,7 @@ DrawState::DrawState( int s_width, int s_height )
: width( s_width ), height( s_height ),
cursor_col( 0 ), cursor_row( 0 ),
combining_char_col( 0 ), combining_char_row( 0 ), tabs( s_width ),
scrolling_region_top_row( 0 ), scrolling_region_bottom_row( height - 1 ),
next_print_will_wrap( false ), origin_mode( false ), auto_wrap_mode( true )
{
for ( int i = 0; i < width; i++ ) {
@@ -72,16 +73,16 @@ void Framebuffer::scroll( int N )
{
if ( N >= 0 ) {
for ( int i = 0; i < N; i++ ) {
rows.pop_front();
rows.push_back( Row( ds.get_width() ) );
rows.erase( rows.begin() + ds.limit_top() );
rows.insert( rows.begin() + ds.limit_bottom(), Row( ds.get_width() ) );
ds.move_row( -1, true );
}
} else {
N = -N;
for ( int i = 0; i < N; i++ ) {
rows.pop_back();
rows.push_front( Row( ds.get_width() ) );
rows.erase( rows.begin() + ds.limit_bottom() );
rows.insert( rows.begin() + ds.limit_top(), Row( ds.get_width() ) );
ds.move_row( 1, true );
}
}
@@ -95,8 +96,8 @@ void DrawState::new_grapheme( void )
void DrawState::snap_cursor_to_border( void )
{
if ( cursor_row < 0 ) cursor_row = 0;
if ( cursor_row >= height ) cursor_row = height - 1;
if ( cursor_row < limit_top() ) cursor_row = limit_top();
if ( cursor_row > limit_bottom() ) cursor_row = limit_bottom();
if ( cursor_col < 0 ) cursor_col = 0;
if ( cursor_col >= width ) cursor_col = width - 1;
}
@@ -139,10 +140,10 @@ void DrawState::move_col( int N, bool relative, bool implicit )
void Framebuffer::move_rows_autoscroll( int rows )
{
if ( ds.get_cursor_row() + rows >= ds.get_height() ) {
scroll( ds.get_height() - ds.get_cursor_row() - rows + 1 );
} else if ( ds.get_cursor_row() + rows < 0 ) {
scroll( ds.get_cursor_row() + rows );
if ( ds.get_cursor_row() + rows > ds.limit_bottom() ) {
scroll( ds.get_cursor_row() + rows - ds.limit_bottom() );
} else if ( ds.get_cursor_row() + rows < ds.limit_top() ) {
scroll( ds.get_cursor_row() + rows - ds.limit_top() );
}
ds.move_row( rows, true );
@@ -203,3 +204,35 @@ int DrawState::get_next_tab( void )
}
return -1;
}
void DrawState::set_scrolling_region( int top, int bottom )
{
if ( height < 1 ) {
return;
}
scrolling_region_top_row = top;
scrolling_region_bottom_row = bottom;
if ( scrolling_region_top_row < 0 ) scrolling_region_top_row = 0;
if ( scrolling_region_bottom_row >= height ) scrolling_region_bottom_row = height - 1;
if ( scrolling_region_bottom_row < scrolling_region_top_row )
scrolling_region_bottom_row = scrolling_region_top_row;
/* real rule requires TWO-line scrolling region */
if ( origin_mode ) {
snap_cursor_to_border();
new_grapheme();
}
}
int DrawState::limit_top( void )
{
return origin_mode ? scrolling_region_top_row : 0;
}
int DrawState::limit_bottom( void )
{
return origin_mode ? scrolling_region_bottom_row : height - 1;
}