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Improve arrow key next focus algorithm.

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This commit is contained in:
Jared Boone 2016-05-08 14:59:03 -07:00
parent 72cc6569ca
commit ab73d6155e
1 changed files with 63 additions and 81 deletions
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144
firmware/common/ui_focus.cpp
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@ -85,67 +85,78 @@ static void widget_collect_visible(Widget* const w, TestFn test, test_collection
}
}
static int32_t rect_distances(
const KeyEvent direction,
const Rect& rect_start,
const Rect& rect_end
) {
Coord on_axis_max, on_axis_min;
switch(direction) {
case KeyEvent::Right:
on_axis_max = rect_end.left();
on_axis_min = rect_start.right();
break;
case KeyEvent::Left:
on_axis_max = rect_start.left();
on_axis_min = rect_end.right();
break;
case KeyEvent::Down:
on_axis_max = rect_end.top();
on_axis_min = rect_start.bottom();
break;
case KeyEvent::Up:
on_axis_max = rect_start.top();
on_axis_min = rect_end.bottom();
break;
default:
return -1;
}
Coord on_axis_distance = on_axis_max - on_axis_min;
if( on_axis_distance < 0 ) {
return -1;
}
Coord perpendicular_axis_start, perpendicular_axis_end;
switch(direction) {
case KeyEvent::Right:
case KeyEvent::Left:
perpendicular_axis_start = rect_start.center().y;
perpendicular_axis_end = rect_end.center().y;
break;
case KeyEvent::Up:
case KeyEvent::Down:
perpendicular_axis_start = rect_start.center().x;
perpendicular_axis_end = rect_end.center().x;
break;
default:
return -1;
}
return (std::abs(perpendicular_axis_end - perpendicular_axis_start) + 1) * (on_axis_distance + 1);
}
void FocusManager::update(
Widget* const top_widget,
const KeyEvent event
) {
if( focus_widget() ) {
const auto focus_screen_rect = focus_widget()->screen_rect();
const auto center = focus_screen_rect.center();
const auto test_fn = [&center, event](ui::Widget* const w) -> test_result_t {
const auto test_fn = [&focus_screen_rect, event](ui::Widget* const w) -> test_result_t {
// if( w->visible() && w->focusable() ) {
if( w->focusable() ) {
const Point delta = w->screen_rect().center() - center;
/* Heuristic to compute closeness. */
/* TODO: Look at metric involving overlap of current
* widget rectangle in the direction of movement, with
* all the prospective widgets.
*/
switch(event) {
case KeyEvent::Right:
if( delta.x > 0 ) {
if( delta.y == 0 ) {
return { w, delta.x };
} else {
return { w, delta.x * abs(delta.y) + 1000 };
}
}
break;
case KeyEvent::Left:
if( delta.x < 0 ) {
if( delta.y == 0 ) {
return { w, -delta.x };
} else {
return { w, -delta.x * abs(delta.y) + 1000 };
}
}
break;
case KeyEvent::Down:
if( delta.y > 0 ) {
if( delta.x == 0 ) {
return { w, delta.y };
} else {
return { w, delta.y * abs(delta.x) + 1000 };
}
}
break;
case KeyEvent::Up:
if( delta.y < 0 ) {
if( delta.x == 0 ) {
return { w, -delta.y };
} else {
return { w, -delta.y * abs(delta.x) + 1000 };
}
}
break;
default:
break;
const auto distance = rect_distances(event, focus_screen_rect, w->screen_rect());
if( distance >= 0 ) {
return { w, distance };
}
}
@ -167,34 +178,5 @@ void FocusManager::update(
}
}
}
#if 0
void FocusManager::update(
Widget* const top_widget,
const TouchEvent event
) {
const auto test_fn = [event](Widget* const w) -> test_result_t {
if( w->focusable() ) {
const auto r = w->screen_rect();
if( r.contains(event) ) {
return { w, 0 };
}
}
return { nullptr, { } };
};
test_collection_t collection;
widget_collect_visible(
top_widget, test_fn,
collection
);
if( !collection.empty() ) {
// Take the last object in the collection, it will be rendered last,
// therefore appear "on top".
const auto touched = collection.back().first;
touched->on_touch(event);
}
}
#endif
} /* namespace ui */