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screen: simplify scrolling code

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Since the separation between internal screen and TUI, internal scroll
cannot FAIL. Delete the conditions for this.
This commit is contained in:
Björn Linse 2019-02-07 12:33:52 +01:00
parent fa2580f953
commit 6e9ea5adce
3 changed files with 60 additions and 91 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/nvim/message.c
View File

@ -2392,9 +2392,8 @@ static int do_more_prompt(int typed_char)
mp_last = msg_sb_start(mp_last->sb_prev);
}
if (toscroll == -1
&& grid_ins_lines(&default_grid, 0, 1, (int)Rows,
0, (int)Columns) == OK) {
if (toscroll == -1) {
grid_ins_lines(&default_grid, 0, 1, (int)Rows, 0, (int)Columns);
grid_fill(&default_grid, 0, 1, 0, (int)Columns, ' ', ' ', 0);
// display line at top
(void)disp_sb_line(0, mp);

7
src/nvim/move.c
View File

@ -925,12 +925,9 @@ void curs_columns(
curwin->w_wrow -= extra;
}
// extra could be either positive or negative
extra = ((int)prev_skipcol - (int)curwin->w_skipcol) / width;
if (extra > 0) {
win_ins_lines(curwin, 0, extra);
} else if (extra < 0) {
win_del_lines(curwin, 0, -extra);
}
win_scroll_lines(curwin, 0, extra);
} else {
curwin->w_skipcol = 0;
}

139
src/nvim/screen.c
View File

@ -335,10 +335,8 @@ void update_screen(int type)
type = CLEAR;
} else if (type != CLEAR) {
check_for_delay(false);
if (grid_ins_lines(&default_grid, 0, msg_scrolled, (int)Rows,
0, (int)Columns) == FAIL) {
type = CLEAR;
}
grid_ins_lines(&default_grid, 0, msg_scrolled, (int)Rows,
0, (int)Columns);
FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
if (wp->w_winrow < msg_scrolled) {
if (W_ENDROW(wp) > msg_scrolled
@ -828,31 +826,31 @@ static void win_update(win_T *wp)
// Try to insert the correct number of lines.
// If not the last window, delete the lines at the bottom.
// win_ins_lines may fail when the terminal can't do it.
if (win_ins_lines(wp, 0, i) == OK) {
if (wp->w_lines_valid != 0) {
/* Need to update rows that are new, stop at the
* first one that scrolled down. */
top_end = i;
scrolled_down = TRUE;
win_scroll_lines(wp, 0, i);
if (wp->w_lines_valid != 0) {
// Need to update rows that are new, stop at the
// first one that scrolled down.
top_end = i;
scrolled_down = true;
/* Move the entries that were scrolled, disable
* the entries for the lines to be redrawn. */
if ((wp->w_lines_valid += j) > wp->w_grid.Rows) {
wp->w_lines_valid = wp->w_grid.Rows;
}
for (idx = wp->w_lines_valid; idx - j >= 0; idx--) {
wp->w_lines[idx] = wp->w_lines[idx - j];
}
while (idx >= 0) {
wp->w_lines[idx--].wl_valid = false;
}
// Move the entries that were scrolled, disable
// the entries for the lines to be redrawn.
if ((wp->w_lines_valid += j) > wp->w_grid.Rows) {
wp->w_lines_valid = wp->w_grid.Rows;
}
} else
mid_start = 0; /* redraw all lines */
} else
mid_start = 0; /* redraw all lines */
} else
mid_start = 0; /* redraw all lines */
for (idx = wp->w_lines_valid; idx - j >= 0; idx--) {
wp->w_lines[idx] = wp->w_lines[idx - j];
}
while (idx >= 0) {
wp->w_lines[idx--].wl_valid = false;
}
}
} else {
mid_start = 0; // redraw all lines
}
} else {
mid_start = 0; // redraw all lines
}
} else {
/*
* New topline is at or below old topline: May scroll up.
@ -889,11 +887,8 @@ static void win_update(win_T *wp)
/* ... but don't delete new filler lines. */
row -= wp->w_topfill;
if (row > 0) {
if (win_del_lines(wp, 0, row) == OK) {
bot_start = wp->w_grid.Rows - row;
} else {
mid_start = 0; // redraw all lines
}
win_scroll_lines(wp, 0, -row);
bot_start = wp->w_grid.Rows - row;
}
if ((row == 0 || bot_start < 999) && wp->w_lines_valid != 0) {
/*
@ -1148,7 +1143,7 @@ static void win_update(win_T *wp)
// Update a line when it is in an area that needs updating, when it
// has changes or w_lines[idx] is invalid.
// "bot_start" may be halfway a wrapped line after using
// win_del_lines(), check if the current line includes it.
// win_scroll_lines(), check if the current line includes it.
// When syntax folding is being used, the saved syntax states will
// already have been updated, we can't see where the syntax state is
// the same again, just update until the end of the window.
@ -1244,11 +1239,8 @@ static void win_update(win_T *wp)
if (row - xtra_rows >= wp->w_grid.Rows - 2) {
mod_bot = MAXLNUM;
} else {
if (win_del_lines(wp, row, -xtra_rows) == FAIL) {
mod_bot = MAXLNUM;
} else {
bot_start = wp->w_grid.Rows + xtra_rows;
}
win_scroll_lines(wp, row, xtra_rows);
bot_start = wp->w_grid.Rows + xtra_rows;
}
} else if (xtra_rows > 0) {
/* May scroll text down. If there is not enough
@ -1257,9 +1249,8 @@ static void win_update(win_T *wp)
if (row + xtra_rows >= wp->w_grid.Rows - 2) {
mod_bot = MAXLNUM;
} else {
if (win_ins_lines(wp, row + old_rows, xtra_rows) == FAIL) {
mod_bot = MAXLNUM;
} else if (top_end > row + old_rows) {
win_scroll_lines(wp, row + old_rows, xtra_rows);
if (top_end > row + old_rows) {
// Scrolled the part at the top that requires
// updating down.
top_end += xtra_rows;
@ -6265,42 +6256,28 @@ void setcursor(void)
}
}
/// Insert 'line_count' lines at 'row' in window 'wp'.
/// Returns FAIL if the lines are not inserted, OK for success.
int win_ins_lines(win_T *wp, int row, int line_count)
/// Scroll 'line_count' lines at 'row' in window 'wp'.
///
/// Positive `line_count' means scrolling down, so that more space is available
/// at 'row'. Negative `line_count` implies deleting lines at `row`.
void win_scroll_lines(win_T *wp, int row, int line_count)
{
return win_do_lines(wp, row, line_count, false);
}
/// Delete "line_count" window lines at "row" in window "wp".
/// Return OK for success, FAIL if the lines are not deleted.
int win_del_lines(win_T *wp, int row, int line_count)
{
return win_do_lines(wp, row, line_count, true);
}
// Common code for win_ins_lines() and win_del_lines().
// Returns OK or FAIL when the work has been done.
static int win_do_lines(win_T *wp, int row, int line_count, int del)
{
if (!redrawing() || line_count <= 0) {
return FAIL;
if (!redrawing() || line_count == 0) {
return;
}
// No lines are being moved, just draw over the entire area
if (row + line_count >= wp->w_grid.Rows) {
return OK;
if (row + abs(line_count) >= wp->w_grid.Rows) {
return;
}
int retval;
if (del) {
retval = grid_del_lines(&wp->w_grid, row, line_count,
wp->w_grid.Rows, 0, wp->w_grid.Columns);
if (line_count < 0) {
grid_del_lines(&wp->w_grid, row, -line_count,
wp->w_grid.Rows, 0, wp->w_grid.Columns);
} else {
retval = grid_ins_lines(&wp->w_grid, row, line_count,
wp->w_grid.Rows, 0, wp->w_grid.Columns);
grid_ins_lines(&wp->w_grid, row, line_count,
wp->w_grid.Rows, 0, wp->w_grid.Columns);
}
return retval;
}
/*
@ -6320,10 +6297,8 @@ static int win_do_lines(win_T *wp, int row, int line_count, int del)
/// 'col' is the column from with we start inserting.
//
/// 'row', 'col' and 'end' are relative to the start of the region.
///
/// @return FAIL for failure, OK for success.
int grid_ins_lines(ScreenGrid *grid, int row, int line_count, int end, int col,
int width)
void grid_ins_lines(ScreenGrid *grid, int row, int line_count, int end, int col,
int width)
{
int i;
int j;
@ -6334,8 +6309,8 @@ int grid_ins_lines(ScreenGrid *grid, int row, int line_count, int end, int col,
row += row_off;
end += row_off;
if (!screen_valid(TRUE) || line_count <= 0) {
return FAIL;
if (!screen_valid(true) || line_count <= 0) {
return;
}
// Shift line_offset[] line_count down to reflect the inserted lines.
@ -6365,17 +6340,15 @@ int grid_ins_lines(ScreenGrid *grid, int row, int line_count, int end, int col,
ui_call_grid_scroll(grid->handle, row, end, col, col+width, -line_count, 0);
return OK;
return;
}
/// delete lines on the screen and move lines up.
/// 'end' is the line after the scrolled part. Normally it is Rows.
/// When scrolling region used 'off' is the offset from the top for the region.
/// 'row' and 'end' are relative to the start of the region.
///
/// Return OK for success, FAIL if the lines are not deleted.
int grid_del_lines(ScreenGrid *grid, int row, int line_count, int end, int col,
int width)
void grid_del_lines(ScreenGrid *grid, int row, int line_count, int end, int col,
int width)
{
int j;
int i;
@ -6386,8 +6359,8 @@ int grid_del_lines(ScreenGrid *grid, int row, int line_count, int end, int col,
row += row_off;
end += row_off;
if (!screen_valid(TRUE) || line_count <= 0) {
return FAIL;
if (!screen_valid(true) || line_count <= 0) {
return;
}
// Now shift line_offset[] line_count up to reflect the deleted lines.
@ -6418,7 +6391,7 @@ int grid_del_lines(ScreenGrid *grid, int row, int line_count, int end, int col,
ui_call_grid_scroll(grid->handle, row, end, col, col+width, line_count, 0);
return OK;
return;
}