73 lines
3 KiB
Text
73 lines
3 KiB
Text
# focus.ludic - the keyboard's place: focus moves through the controls in document order (Tab and
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# Shift+Tab, or the arrows), Enter and Space activate what has it, and a pointer press focuses what
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# it presses; a key field that is listening has every key to itself. A key that is gone from the screen leaves nothing focused.
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function fc_collect(ui_st: mut UiState, n: UiNode) -> void {
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if n.focusable and n.enabled { push(ui_st.fc_list, n) }
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for i in 0 .. len(n.children) { fc_collect(ui_st, n.children[i]) }
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}
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function fc_find(ui_st: UiState) -> int {
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for i in 0 .. len(ui_st.fc_list) {
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if ui_st.fc_list[i].key == ui_st.fc_key { return i }
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}
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return -1
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}
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function fc_move(ui_st: mut UiState, step: int) -> void {
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if len(ui_st.fc_list) == 0 { return }
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var at = fc_find(ui_st)
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if at < 0 {
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at = 0
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if step < 0 { at = len(ui_st.fc_list) - 1 }
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} else { at = (at + step + len(ui_st.fc_list)) % len(ui_st.fc_list) }
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ui_st.fc_key = ui_st.fc_list[at].key
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ui_st.fc_visible = true
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}
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# the keys, after the tree is laid out: moving, then acting on what has the focus
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function fc_keys(ui_st: mut UiState, root: UiNode) -> void {
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List.clear(ui_st.fc_list)
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let top = pp_top(root)
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if top != null { fc_collect(ui_st, top) } else { fc_collect(ui_st, root) }
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if ct_key_capture(ui_st, ui_st.fc_list) { return }
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if top != null and ui_st.in_now.escape { ui_fire(ui_st, top, "close", Value.null()) }
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let i = ui_st.in_now
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if fc_find(ui_st) < 0 { fc_autofocus(ui_st) }
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let at = fc_find(ui_st)
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var n: UiNode = null
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if at >= 0 { n = ui_st.fc_list[at] }
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if i.tab and i.shift { fc_move(ui_st, -1) } else if i.tab { fc_move(ui_st, 1) }
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let horizontal = n != null and ct_takes_arrows(n)
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if i.up or (i.left and not horizontal) { fc_move(ui_st, -1) }
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if i.down_key or (i.right and not horizontal) { fc_move(ui_st, 1) }
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ct_num_blur(ui_st, root)
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if n == null { return }
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fc_hold(ui_st, root, n)
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if i.enter or (i.space and not ct_takes_space(n)) { ct_activate(ui_st, n) }
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if horizontal and i.left { ct_step(ui_st, n, -1) }
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if horizontal and i.right { ct_step(ui_st, n, 1) }
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ct_typed(ui_st, n)
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}
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# Enter or A held on a control: its on-down, and on-up when let go (or the focus moves away)
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function fc_hold(ui_st: mut UiState, root: UiNode, n: UiNode) -> void {
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if ui_st.fr_key_press != "" and (ui_st.in_act_up or n.key != ui_st.fr_key_press) {
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let was = fr_node(root, ui_st.fr_key_press)
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if was != null { ui_fire(ui_st, was, "up", Value.null()) }
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ui_st.fr_key_press = ""
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}
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if ui_st.in_act_down and n.enabled {
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ui_st.fr_key_press = n.key
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ui_fire(ui_st, n, "down", Value.null())
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}
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}
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export function ui_focus(ui_st: mut UiState, key: string) -> void {
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ui_st.fc_key = key
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ui_st.fc_visible = false
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}
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# nothing focused (a screen just opened): the control that says autofocus, as HTML's does
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function fc_autofocus(ui_st: mut UiState) -> void {
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for i in 0 .. len(ui_st.fc_list) {
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if ui_attr_on(ui_st.fc_list[i], "autofocus") {
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ui_st.fc_key = ui_st.fc_list[i].key
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ui_st.fc_visible = false
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return
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}
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}
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}
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