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#include "geometry.hpp"
#include <algorithm>
namespace unbox::ext_window_field::geom {
auto apply_drag(Box start, Handle handle, int dx, int dy, Limits lim) -> Box {
Box r = start;
switch (handle) {
case Handle::move:
r.x = start.x + dx;
r.y = start.y + dy;
break;
case Handle::resize_br:
// Right + bottom edges follow the pointer; top-left anchored.
r.w = std::max(lim.min_w, start.w + dx);
r.h = std::max(lim.min_h, start.h + dy);
break;
case Handle::resize_bl:
// Left + bottom edges follow; the RIGHT edge (start.x + start.w) and the
// top edge stay anchored. Compute the new width first (clamped), then
// place x so the right edge does not move.
r.w = std::max(lim.min_w, start.w - dx);
r.x = start.x + start.w - r.w;
r.h = std::max(lim.min_h, start.h + dy);
break;
}
return r;
}
auto clamp_to_field(Box b, int field_w, int field_h) -> Box {
if (field_w > 0) {
// Largest x that keeps the right edge inside; pin to 0 if the window is
// wider than the field. Then clamp the origin into [0, max_x].
const int max_x = std::max(0, field_w - b.w);
b.x = std::clamp(b.x, 0, max_x);
}
if (field_h > 0) {
const int max_y = std::max(0, field_h - b.h);
b.y = std::clamp(b.y, 0, max_y);
}
return b;
}
} // namespace unbox::ext_window_field::geom
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