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Add support for mouse wheel

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This commit is contained in:
Maxime Coste 2015-03-22 12:17:01 +00:00
parent 5eaf472fc0
commit 323b0359c7
3 changed files with 43 additions and 0 deletions
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37
src/input_handler.cc
View File

@ -80,10 +80,47 @@ struct MouseHandler
context.selections() = SelectionList{ context.buffer(), Selection{m_anchor, cursor} };
return true;
}
if (key.modifiers == Key::Modifiers::MouseWheelDown)
{
wheel(context, 3);
return true;
}
if (key.modifiers == Key::Modifiers::MouseWheelUp)
{
wheel(context, -3);
return true;
}
return false;
}
private:
void wheel(Context& context, LineCount offset)
{
Window& window = context.window();
Buffer& buffer = context.buffer();
CharCoord win_pos = window.position();
CharCoord win_dim = window.dimensions();
const CharCoord max_offset{(win_dim.line - 1)/2, (win_dim.column - 1)/2};
const CharCoord scrolloff =
std::min(context.options()["scrolloff"].get<CharCoord>(), max_offset);
const LineCount line_count = buffer.line_count();
win_pos.line = clamp(win_pos.line + offset, 0_line, line_count-1);
SelectionList& selections = context.selections();
const ByteCoord cursor = selections.main().cursor();
auto clamp_line = [&](LineCount line) { return clamp(line, 0_line, line_count-1); };
auto min_coord = buffer.offset_coord(clamp_line(win_pos.line + scrolloff.line), win_pos.column);
auto max_coord = buffer.offset_coord(clamp_line(win_pos.line + win_dim.line - scrolloff.line), win_pos.column);
selections = SelectionList{buffer, clamp(cursor, min_coord, max_coord)};
window.set_position(win_pos);
}
bool m_dragging = false;
ByteCoord m_anchor;
};

4
src/keys.hh
View File

@ -22,6 +22,8 @@ struct Key
MousePress = 1 << 2,
MouseRelease = 1 << 3,
MousePos = 1 << 4,
MouseWheelDown = 1 << 5,
MouseWheelUp = 1 << 6,
};
enum NamedKey : Codepoint
{
@ -90,6 +92,8 @@ constexpr Codepoint encode_mouse_coord(CharCoord coord) { return (Codepoint)(((i
constexpr Key mouse_press(CharCoord pos) { return { Key::Modifiers::MousePress, encode_mouse_coord(pos) }; }
constexpr Key mouse_release(CharCoord pos) { return { Key::Modifiers::MouseRelease, encode_mouse_coord(pos) }; }
constexpr Key mouse_pos(CharCoord pos) { return { Key::Modifiers::MousePos, encode_mouse_coord(pos) }; }
constexpr Key mouse_wheel_down(CharCoord pos) { return { Key::Modifiers::MouseWheelDown, encode_mouse_coord(pos) }; }
constexpr Key mouse_wheel_up(CharCoord pos) { return { Key::Modifiers::MouseWheelUp, encode_mouse_coord(pos) }; }
inline size_t hash_value(const Key& key) { return hash_values(key.modifiers, key.key); }

2
src/ncurses_ui.cc
View File

@ -456,6 +456,8 @@ Key NCursesUI::get_key()
CharCoord pos{ ev.y, ev.x };
if ((ev.bstate & BUTTON1_PRESSED) == BUTTON1_PRESSED) return mouse_press(pos);
if ((ev.bstate & BUTTON1_RELEASED) == BUTTON1_RELEASED) return mouse_release(pos);
if ((ev.bstate & BUTTON2_PRESSED) == BUTTON2_PRESSED) return mouse_wheel_down(pos);
if ((ev.bstate & BUTTON4_PRESSED) == BUTTON4_PRESSED) return mouse_wheel_up(pos);
else return mouse_pos(pos);
}
}