75 lines
2.6 KiB
Text
75 lines
2.6 KiB
Text
# tooltip.ludic - an element's title="..." shown beside the pointer once it has rested on it for half
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# a second (or under it, when the keyboard's focus has), in a box styled by .ui-tooltip; a title of
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# several lines (a newline, or \n) is one .ui-tooltip-text a line
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function tt_track(ui_st: mut UiState, root: UiNode, x: float, y: float) -> void {
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var scope = pp_top(root)
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if scope == null { scope = root }
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var n = tt_under(scope, x, y)
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var px = x
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var py = y
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let k = tt_focused(ui_st, scope, x, y)
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if k != null {
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n = k
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px = k.x
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py = k.y + k.ch - ui_px(ui_st, 14.0)
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}
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if n == null {
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ui_st.tt_key = ""
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return
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}
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let title = ui_attr_text(n, "title")
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if n.key != ui_st.tt_key {
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ui_st.tt_key = n.key
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ui_st.tt_since = an_now(ui_st)
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ui_st.tt_src = null
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}
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if ui_st.tt_src == null or title != ui_st.tt_src { # translated when the element or its title changes, not a frame
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ui_st.tt_src = title
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ui_st.tt_text = tt_translate(ui_st, n, title)
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}
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ui_st.tt_x = px
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ui_st.tt_y = py
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}
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# the deepest element under the point that has a title
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function tt_under(n: UiNode, x: float, y: float) -> UiNode {
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if x < n.x or y < n.y or x >= n.x + n.cw or y >= n.y + n.ch { return null }
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var i = len(n.children) - 1
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while i >= 0 {
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let t = tt_under(n.children[i], x, y)
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if t != null { return t }
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i -= 1
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}
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if n.akeys != null and ui_attr_text(n, "title") != "" { return n }
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return null
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}
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function tt_draw(ui_st: mut UiState, root: UiNode) -> void {
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if ui_st.tt_key == "" or ui_st.tt_text == "" or an_now(ui_st) - ui_st.tt_since < 0.5 { return }
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let n = ct_part(ui_st, root, "ui-tooltip", "")
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n.tag = "div"
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n.parent = root
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let lines = tt_lines(ui_st, ui_st.tt_text)
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for i in 0 .. len(lines) { ui_kept(n.children, ct_part(ui_st, root, "ui-tooltip-text", lines[i])) }
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cs_tree(ui_st, n)
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ly_measure(ui_st, n, ui_st.ly_vp_w * 0.4, ui_px(ui_st, 16.0), root.rfg)
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let x = Math.min(ui_st.tt_x + ui_px(ui_st, 16.0), ui_st.ly_vp_x + ui_st.ly_vp_w - n.mw)
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let y = Math.min(ui_st.tt_y + ui_px(ui_st, 20.0), ui_st.ly_vp_y + ui_st.ly_vp_h - n.mh)
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ly_place(ui_st, n, x, y, n.mw, n.mh)
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fr_draw(ui_st, n)
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}
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# a title's lines: apart at a newline, or at a written \n (which an attribute cannot hold otherwise)
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@alloc_ok("a memo miss: once per title (memo_more.ludic), bounded by MM_CAP")
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function tt_lines_new(s: string) -> []string {
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let out = new []string
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var at = 0
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var i = 0
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while i < len(s) {
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if s[i] == 10 or (s[i] == 92 and i + 1 < len(s) and s[i + 1] == 110) {
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push(out, s[at..i])
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if s[i] == 92 { i += 1 }
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at = i + 1
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}
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i += 1
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}
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push(out, s[at..len(s)])
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return out
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}
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