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Update scroll behavior

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This commit is contained in:
Mikhail Pogretskiy 2019-11-28 22:35:52 +07:00
parent b765fb4971
commit 89b4996fd7
3 changed files with 20 additions and 14 deletions
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28
src/input_handler.cc
View File

@ -138,7 +138,7 @@ struct MouseHandler
return true;
case Key::Modifiers::Scroll:
scroll_window(context, static_cast<int32_t>(key.key), not m_dragging);
scroll_window(context, static_cast<int32_t>(key.key), m_dragging);
return true;
default: return false;
@ -1722,31 +1722,33 @@ void hide_auto_info_ifn(const Context& context, bool hide)
context.client().info_hide();
}
void scroll_window(Context& context, LineCount offset, bool adapt_cursor)
void scroll_window(Context& context, LineCount offset, bool mouse_dragging)
{
Window& window = context.window();
Buffer& buffer = context.buffer();
const LineCount line_count = buffer.line_count();
DisplayCoord win_pos = window.position();
DisplayCoord win_dim = window.dimensions();
if ((offset < 0 and win_pos.line == 0) or (offset > 0 and win_pos.line == line_count - 1))
return;
const DisplayCoord max_offset{(win_dim.line - 1)/2, (win_dim.column - 1)/2};
const DisplayCoord scrolloff =
std::min(context.options()["scrolloff"].get<DisplayCoord>(), max_offset);
const LineCount line_count = buffer.line_count();
win_pos.line = clamp(win_pos.line + offset, 0_line, line_count-1);
window.set_position(win_pos);
if (not adapt_cursor)
return;
Selection& main_selection = context.selections().main();
const BufferCoord anchor = main_selection.anchor();
const BufferCoord cursor = main_selection.cursor();
SelectionList& selections = context.selections();
const BufferCoord cursor = selections.main().cursor();
auto cursor_off = mouse_dragging ? win_pos.line - window.position().line : 0;
auto line = clamp(cursor.line, win_pos.line + scrolloff.line,
auto line = clamp(cursor.line + cursor_off, win_pos.line + scrolloff.line,
win_pos.line + win_dim.line - 1 - scrolloff.line);
line = clamp(line, 0_line, line_count-1);
line = clamp(line, 0_line, buffer.line_count() - 1);
using std::min; using std::max;
// This is not exactly a clamp, and must be done in this order as
@ -1754,7 +1756,11 @@ void scroll_window(Context& context, LineCount offset, bool adapt_cursor)
auto col = min(max(cursor.column, buffer[line].byte_count_to(win_pos.column)),
buffer[line].length()-1);
selections = SelectionList{buffer, BufferCoord{line, col}};
BufferCoord new_cursor = { line, col };
BufferCoord new_anchor = (mouse_dragging or new_cursor == cursor) ? anchor : new_cursor;
window.set_position(win_pos);
main_selection = { new_anchor, new_cursor };
}
}

2
src/input_handler.hh
View File

@ -187,7 +187,7 @@ void on_next_key_with_autoinfo(const Context& context, StringView mode_name,
});
}
void scroll_window(Context& context, LineCount offset, bool adapt_cursor = true);
void scroll_window(Context& context, LineCount offset, bool mouse_dragging = false);
}

4
src/normal.cc
View File

@ -376,10 +376,10 @@ void view_commands(Context& context, NormalParams params)
window.scroll(-std::max<ColumnCount>(1, count));
break;
case 'j':
window.scroll( std::max<LineCount>(1, count));
scroll_window(context, std::max<LineCount>(1, count));
break;
case 'k':
window.scroll(-std::max<LineCount>(1, count));
scroll_window(context, -std::max<LineCount>(1, count));
break;
case 'l':
window.scroll( std::max<ColumnCount>(1, count));