35 lines
1.3 KiB
Text
35 lines
1.3 KiB
Text
# state.ludic - a component's or a screen's own values, <state name="{first}"/>, kept from frame
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# to frame by where the instance is in the tree, and set by `set name = value`
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function st_for(ui_st: mut UiState, key: string, t: UiTpl, e: UiEnv) -> Val {
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var decl: UiTpl = null
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for i in 0 .. len(t.kids) {
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if t.kids[i].tag == "state" { decl = t.kids[i] }
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}
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if decl == null { return null }
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for i in 0 .. len(ui_st.st_keys) {
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if ui_st.st_keys[i] == key { return ui_st.st_vals[i] }
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}
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let o = Value.object()
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let was = ui_st.uv_on # a state's start is kept for good: its values are never pooled
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ui_st.uv_on = false
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for i in 0 .. len(decl.keys) { Value.put(o, decl.keys[i], ui_eval(ui_st, decl.vals[i], e)) }
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ui_st.uv_on = was
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ui_kept(ui_st.st_keys, key)
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ui_kept(ui_st.st_vals, o)
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return o
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}
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# a screen's state starts again the next time it opens
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export function ui_forget(ui_st: mut UiState, screen: string) -> void {
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let keys = new []string
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let vals = new []Val
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for i in 0 .. len(ui_st.st_keys) {
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let k = ui_st.st_keys[i]
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let mine = len(k) >= len(screen) and sat(k, 0, screen) and (len(k) == len(screen) or k[len(screen)] == 47)
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if not mine {
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push(keys, k)
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push(vals, ui_st.st_vals[i])
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}
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}
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ui_st.st_keys = keys
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ui_st.st_vals = vals
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}
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