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| author | Colomban Wendling <[email protected]> | 2018-09-04 14:22:04 +0200 |
|---|---|---|
| committer | raveit65 <[email protected]> | 2018-10-20 18:06:52 +0200 |
| commit | a7d0b8dfb7993a7f8938c4a89c1df68001bfd456 (patch) | |
| tree | 9efa6e822c0739b6f46e724b1164003fbfd15446 /libview | |
| parent | f4a771536e9454c876c1cd27be2bbf90495ac6f0 (diff) | |
| download | atril-a7d0b8dfb7993a7f8938c4a89c1df68001bfd456.tar.bz2 atril-a7d0b8dfb7993a7f8938c4a89c1df68001bfd456.tar.xz | |
EvView: Fix cursor movement when logical and visual line order differs
Make sure not to move the caret in the wrong direction when restoring
the visual line X offset, in case the visual and logical order is
slightly different.
The algorithm used to move the cursor on the next line and restore the
X position across lines works as follows:
1. Move `cursor_offset` to the next line by incrementing it until
reaching a line break;
2. Find the Y coordinate corresponding to the new cursor_offset;
3. Find the text closest to the new Y coordinate and the previous X
coordinate.
4. Move cursor_offset to the text at this new (X, Y) location.
The issue lies in step 3, which can find a position on a different line
than expected in case several lines have a nearly the same Y position.
Evince references:
* https://gitlab.gnome.org/GNOME/evince/issues/889
* https://gitlab.gnome.org/GNOME/evince/merge_requests/81
* https://gitlab.gnome.org/GNOME/evince/commit/dddd98b4c7922e2906bba6a31afa07837ae6c39c
Diffstat (limited to 'libview')
| -rw-r--r-- | libview/ev-view.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/libview/ev-view.c b/libview/ev-view.c index a7748b70..5571f567 100644 --- a/libview/ev-view.c +++ b/libview/ev-view.c @@ -5406,6 +5406,7 @@ ev_view_move_cursor (EvView *view, gint prev_page; cairo_region_t *damage_region; gboolean clear_selections = FALSE; + const gboolean forward = count >= 0; if (!view->caret_enabled || view->rotation != 0) return FALSE; @@ -5475,9 +5476,18 @@ ev_view_move_cursor (EvView *view, return TRUE; if (step == GTK_MOVEMENT_DISPLAY_LINES) { + const gint prev_cursor_offset = view->cursor_offset; + position_caret_cursor_at_location (view, MAX (rect.x, view->cursor_line_offset), rect.y + (rect.height / 2)); + /* Make sure we didn't move the cursor in the wrong direction + * in case the visual order isn't the same as the logical one, + * in order to avoid cursor movement loops */ + if ((forward && prev_cursor_offset > view->cursor_offset) || + (!forward && prev_cursor_offset < view->cursor_offset)) { + view->cursor_offset = prev_cursor_offset; + } if (!clear_selections && prev_offset == view->cursor_offset && prev_page == view->cursor_page) { gtk_widget_error_bell (GTK_WIDGET (view)); |