From 5aa0a68d3d5af745b97ddec576f0bbfbe18ed2ab Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marc=20Andr=C3=A9=20Tanner?= Date: Mon, 3 Oct 2016 13:05:51 +0200 Subject: vis: improve cursor positioning after scrolling Make cursor placement after scrolling (half) pages up/down less arbitrary. Close #390, fix #391 --- view.c | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) (limited to 'view.c') diff --git a/view.c b/view.c index 8f37dcc..1d620de 100644 --- a/view.c +++ b/view.c @@ -738,6 +738,43 @@ size_t view_scroll_up(View *view, int lines) { return cursor->pos; } +size_t view_scroll_page_up(View *view) { + Cursor *cursor = view->cursor; + if (view->start == 0) { + view_cursor_to(view, 0); + } else { + view_cursor_to(view, view->start-1); + view_redraw_bottom(view); + view_screenline_begin(cursor); + } + return cursor->pos; +} + +size_t view_scroll_page_down(View *view) { + view_scroll_down(view, view->height); + return view_screenline_begin(view->cursor); +} + +size_t view_scroll_halfpage_up(View *view) { + Cursor *cursor = view->cursor; + if (view->start == 0) { + view_cursor_to(view, 0); + } else { + view_cursor_to(view, view->start-1); + view_redraw_center(view); + view_screenline_begin(cursor); + } + return cursor->pos; +} + +size_t view_scroll_halfpage_down(View *view) { + size_t end = view->end; + size_t pos = view_scroll_down(view, view->height/2); + if (pos < text_size(view->text)) + view_cursor_to(view, end); + return view->cursor->pos; +} + size_t view_scroll_down(View *view, int lines) { Cursor *cursor = view->cursor; if (view_viewport_down(view, lines)) { -- cgit v1.2.3