36 lines
1.3 KiB
Text
36 lines
1.3 KiB
Text
# popover_within.ludic - what an anchored popover is kept inside: the element named by within="id",
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# else the nearest scroll box (or overflow box) around it, else the screen; it flips against the same
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function pp_bounds(ui_st: mut UiState, p: UiNode) -> void {
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ui_st.pp_bx = ui_st.ly_vp_x
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ui_st.pp_by = ui_st.ly_vp_y
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ui_st.pp_bw = ui_st.ly_vp_w
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ui_st.pp_bh = ui_st.ly_vp_h
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var box: UiNode = null
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let id = ui_attr_text(p, "within")
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if id != "" {
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var at = p.parent
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while at != null and box == null {
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box = pp_by_id(at, id, p)
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at = at.parent
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}
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@alloc_ok("only when a template is wrong: a broken screen, never a working one")
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if box == null { ui_err(ui_st, `within="{id}": no element has that id`) }
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} else {
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var at = p.parent
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while at != null and box == null {
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if at.kind == UI_SCROLL { box = at }
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at = at.parent
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}
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}
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if box == null { return }
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ui_st.pp_bx = box.x
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ui_st.pp_by = box.y
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ui_st.pp_bw = box.cw
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ui_st.pp_bh = box.ch
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}
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# where a popover of `size` starts along its anchor's side: level with its start, centred, or its end
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function pp_along(align: string, at: float, span: float, size: float) -> float {
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if align == "center" { return at + (span - size) / 2.0 }
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if align == "end" { return at + span - size }
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return at
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}
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