Class: Tuile::ScreenPane

Inherits:
Component show all
Defined in:
lib/tuile/screen_pane.rb,
sig/tuile.rbs

Overview

The structural root of the Screen's component tree.

Screen is a singleton runtime owner (event loop, lock, terminal IO, invalidation set). All actual UI lives under a ScreenPane: the tiled #content and the #popups stack. Putting them under a single Component parent gives focus traversal a real root, makes Component#attached? a one-liner, and lets popup-focus repair fall out of the standard Component#on_child_removed hook.

The pane owns no chrome of its own — no status bar, no reserved row. #content gets the full pane rect, and an app that wants a status line builds one into its own layout and drives it from Tuile::Screen#on_focus_changed= (D_status_bar).

The pane is not a Component::Layout: popups deliberately overlap content (Z-ordered, full overdraw, no clipping) and key/mouse dispatch follows modal-popup rules rather than active-child dispatch.

Constant Summary collapse

FINAL_METHODS =

Returns:

  • (::Array[Symbol]) 

      
    

  




  
Instance Attribute Summary collapse

  



  
  
  
Attributes inherited from Component

  
#bg_color, #children, #on_theme_changed, #parent, #rect



  
    

      Instance Method Summary
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Methods inherited from Component

  
#active=, #active?, #add_child, #attached?, #children_tile_rect?, #clear_background, #clear_outside_extent, #cursor_position, #depth, #detach_child, #draw_char, #draw_text, #effective_bg_color, #extent, #extent_rect, #fire_lifecycle, #focus, #height, #invalidate, #on_attached, #on_detached, #on_focus, #on_tree, #on_width_changed, #remove_child, #root, #screen, #size, #tab_stop?, verify_final!, #width



  
Constructor Details

  
    

  

  
    #initialize  ⇒ ScreenPane 
  

  

  


  

    
Returns a new instance of ScreenPane.


  





  



  

    
      


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# File 'lib/tuile/screen_pane.rb', line 22

def initialize
  super
  @popups = []
  # Per-popup snapshot of {Screen#focused} taken just before the popup was
  # added. Restored when the popup closes so focus returns to where the
  # user was, instead of falling through to {#content} and getting
  # cascaded to the first focusable child.
  @popup_prior_focus = {}
end

    		
  





  



  

    
Instance Attribute Details

    
      
      
      

  

  
    #content  ⇒ Component? 
  

  

  


  

    
@return — the tiled content component.


  





  

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# File 'lib/tuile/screen_pane.rb', line 33

def content
  @content
end

    		
  





    
      
      
      

  

  
    #popups  ⇒ ::Array[Component::Overlay]  (readonly)
  

  

  


  

    
@return — the open overlays in stacking order;
last is topmost. Holds both Component::Popup modals and bare
Component::Overlays (Component::Overlay#modal?). The array must not
be mutated by callers.


  





  

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# File 'lib/tuile/screen_pane.rb', line 38

def popups
  @popups
end

    		
  





    
  



  

    
Instance Method Details


    
      

  

  
    #add_popup(window)  ⇒ void 
  

  

  


  

    
This method returns an undefined value.
Adds an overlay and invalidates it for repaint. A Component::Popup is
centered and grabs focus; a bare Component::Overlay is left wherever
the caller positioned it and does not take focus, so the component that
was focused keeps the cursor and keeps receiving keys — the overlay
floats above the content, driven from app code.


The whole subtree is invalidated, not just the overlay wrapper (which
paints nothing on its own): a reopened popup may land on cells that the
tiled content has since overpainted, and if its rect is unchanged from
last time its content components won't re-invalidate themselves — so
without this the overlay's contents would stay blank on reopen.


@param window — any overlay, modal or not.


  





  
Parameters:






  

    
      


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# File 'lib/tuile/screen_pane.rb', line 71

def add_popup(window)
  raise TypeError, "expected Overlay, got #{window.inspect}" unless window.is_a? Component::Overlay
  raise ArgumentError, "#{window} already has a parent #{window.parent}" unless window.parent.nil?

  @popup_prior_focus[window] = screen.focused
  @popups << window
  add_child(window) # appended: popups paint over the tiled content
  if window.modal?
    window.center
    screen.focused = window
  end
  window.on_tree { |c| screen.invalidate(c) }
end

    		
  





    
      

  

  
    #bubble_key(key, scope)  ⇒ Boolean 
  

  

  


  

    
Delivers key to Tuile::Screen#focused and bubbles it up the ancestor chain,
stopping at (and including) scope. Delivers to no one — returning false
— when focus is nil or sits outside scope; the latter is what makes an
open popup modal, since focus is always inside it and content beneath
never receives keys.


@param key


@param scope — the modal scope root (topmost popup or content).


@return — true if some component on the chain handled the key.


  





  
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        (Boolean)
      
      
      
    
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# File 'lib/tuile/screen_pane.rb', line 317

def bubble_key(key, scope)
  chain = focus_chain(scope)
  return false if chain.nil?

  chain.each { |c| return true if c.handle_key(key) }
  false
end

    		
  





    
      

  

  
    #detach_all  ⇒ void 
  

  

  


  

    
This method returns an undefined value.
Unmounts everything: each child is detached — firing Component#on_detached
down its subtree — and every slot is emptied. Terminal; the pane isn't
reusable afterwards, and Tuile::Screen#close is its only caller.


Deliberately not named close (Component::Overlay#close already means
"remove me from the pane"), and deliberately not a generic
Component#remove_all_children: a slot container calling that would empty
@children while #content / #footer still pointed at detached
components, which is the desync the tree API exists to prevent.


  





  



  

    
      


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# File 'lib/tuile/screen_pane.rb', line 115

def detach_all
  screen.focused = nil # …so the focus repair in on_child_removed has nothing to do
  children.dup.each { detach_child(_1) }
  @content = nil
  @popups.clear
  @popup_prior_focus.clear
end

    		
  





    
      

  

  
    #enclosing_popup(component)  ⇒ Component::Overlay? 
  

  

  


  

    
@param component


@return — component itself when it is an
overlay, else the nearest overlay above it, else nil.


  





  
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# File 'lib/tuile/screen_pane.rb', line 304

def enclosing_popup(component)
  component = component.parent until component.nil? || component.is_a?(Component::Overlay)
  component
end

    		
  





    
      

  

  
    #first_tab_stop_or_root(root)  ⇒ Component? 
  

  

  


  

    
First Component#tab_stop? in root's subtree (pre-order), falling
back to root itself when the subtree has no tab stops. Returns nil
if root is nil.


@param root


  





  
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# File 'lib/tuile/screen_pane.rb', line 346

def first_tab_stop_or_root(root)
  return nil if root.nil?

  root.on_tree { |c| return c if c.tab_stop? }
  root
end

    		
  





    
      

  

  
    #focus_chain(scope)  ⇒ ::Array[Component]? 
  

  

  


  

    
Tuile::Screen#focused and its ancestors up to and including scope.


@param scope — the modal scope root (topmost popup or content).


@return — the chain, innermost first; nil when
focus is nil or sits outside scope.


  





  
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# File 'lib/tuile/screen_pane.rb', line 329

def focus_chain(scope)
  chain = []
  cursor = screen.focused
  until cursor.nil?
    chain << cursor
    break if cursor.equal?(scope)

    cursor = cursor.parent
  end
  chain.last.equal?(scope) ? chain : nil
end

    		
  





    
      

  

  
    #focusable?  ⇒ Boolean 
  

  

  


  

    

  





  

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        (Boolean)
      
      
      
    
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# File 'lib/tuile/screen_pane.rb', line 40

def focusable? = false

    		
  





    
      

  

  
    #handle_key(key)  ⇒ Boolean 
  

  

  


  

    
Delivers a key to Tuile::Screen#focused, then bubbles it up the focus chain —
the first component whose handle_key returns true wins.


Bubbling stops at the scope root: the topmost modal popup when one is
open, else the tiled #content. Focus that is nil or sits outside the
scope receives nothing, which is what keeps an open modal popup modal.
Non-modal overlays are never the scope: focus stays in the content
beneath them, and the overlay is driven by app code (which forwards keys
to it explicitly), so it doesn't appear in this path at all.


Because an ancestor sees a key only after every descendant on the chain
declined it, the scope root is the natural home for scope-wide fallbacks
— a form's default button, or a layout's one-key jumps to its panes (a
focused Component::TextField consumes the key first, so typing is never
hijacked).


@param key


@return — true if the key was handled.


  





  
Parameters:


    
  
    
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        key
      
      
        (String)
      
      
      
    
    • 
  




Returns:


    
  
    
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        (Boolean)
      
      
      
    
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# File 'lib/tuile/screen_pane.rb', line 176

def handle_key(key)
  scope = modal_popup || @content
  return false if scope.nil?

  bubble_key(key, scope)
end

    		
  





    
      

  

  
    #handle_mouse(event)  ⇒ void 
  

  

  


  

    
This method returns an undefined value.
Mouse events check popups in reverse stacking order (topmost first), and
fall through to content only when no popup is hit and no modal popup is
open. This preserves modal click-blocking — an open modal eats clicks
even outside its rect — while a non-modal overlay blocks nothing: clicks
inside it route to it (e.g. click-to-select), clicks elsewhere reach the
content beneath.


A left click also dismisses the open popups it landed outside of that
asked for it (Component::Overlay#close_on_outside_click?). That is a
second thing happening on a click, but not a second dispatch: the click is
still delivered exactly once, down one chain, and a dismissed popup is
closed rather than told.


"Outside" is measured against the Component::Overlay#owner chain, not
against one rect and not against stacking order: the popup the click hit
is kept, and so is every popup that one belongs to, transitively. That
is what stops a dialog being dismissed by a click on a dropdown its own
field opened, and a menu cascade being dismissed by a click on one of its
own deeper panels. Order carries no meaning here — between unrelated
overlays it is merely the order they opened in — so ownership is declared
rather than inferred from the stack.


Two halves of the ordering are load-bearing, and both are specced:


    

  • Snapshot before routing. A popup the delivered click opens must
not be in the set (it would immediately dismiss itself — every
Component::Select would be unopenable by mouse).
    • 

  • Close after routing. A widget toggling its own overlay from a click
on its face closes it during delivery, and Component::Overlay#close is
idempotent, so the dismissal no-ops. Close first and the widget sees
a shut overlay and reopens it — a Select's dropdown could then never be
dismissed by clicking the Select.
    • 



The snapshot is a fresh array for a third reason: a handler may close
further popups, and @popups must not be mutated mid-iteration.


@param event


  





  
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# File 'lib/tuile/screen_pane.rb', line 236

def handle_mouse(event)
  hit = @popups.reverse_each.find { _1.rect.contains?(event.point) }
  dismissable = event.button == :left ? @popups - kept_by(hit) : []

  clicked = hit || (@content if modal_popup.nil?)
  clicked&.handle_mouse(event)

  dismissable.each { _1.close if _1.close_on_outside_click? }
end

    		
  





    
      

  

  
    #handle_paste(text)  ⇒ Boolean 
  

  

  


  

    
Delivers pasted text along the same focus chain #handle_key bubbles
along, and with the same scoping — first Component#handle_paste
returning true wins.


@param text


@return — true if the text was consumed.


  





  
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        text
      
      
        (String)
      
      
      
    
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        (Boolean)
      
      
      
    
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# File 'lib/tuile/screen_pane.rb', line 188

def handle_paste(text)
  scope = modal_popup || @content
  return false if scope.nil?

  chain = focus_chain(scope)
  return false if chain.nil?

  chain.each { |c| return true if c.handle_paste(text) }
  false
end

    		
  





    
      

  

  
    #has_popup?(window)  ⇒ Boolean 
  

  

  


  

    
@param window


@return — true if this pane currently hosts the popup.


  





  
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        (Boolean)
      
      
      
    
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# File 'lib/tuile/screen_pane.rb', line 125

def has_popup?(window) = @popups.include?(window) # rubocop:disable Naming/PredicatePrefix

    		
  





    
      

  

  
    #kept_by(hit)  ⇒ ::Array[Component::Overlay] 
  

  

  


  

    
The overlays a click counts as landing inside: the one it hit, plus
every overlay that one belongs to, up the Component::Overlay#owner
chain. An owner is any component, so it is resolved to the overlay
enclosing it (an overlay resolves to itself) — which keeps the
relationship a live tree question rather than one frozen when the overlay
opened. The include? guard makes a mis-wired cycle terminate instead of
hanging the UI thread.


@param hit — the overlay the click landed in, if any.


  





  
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# File 'lib/tuile/screen_pane.rb', line 291

def kept_by(hit)
  kept = []
  overlay = hit
  while overlay && !kept.include?(overlay)
    kept << overlay
    overlay = enclosing_popup(overlay.owner)
  end
  kept
end

    		
  





    
      

  

  
    #layout  ⇒ void 
  

  

  


  

    
This method returns an undefined value.
Gives #content the whole pane rect — the pane reserves nothing for
itself. Each popup re-resolves its Component::Popup#declared_size against the new
screen via Component::Popup#reposition — so a Fraction size tracks
resize — repositioning itself (modal popups recenter; non-modal overlays
keep the top-left their owner assigned).


  





  



  

    
      


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# File 'lib/tuile/screen_pane.rb', line 148

def layout
  return if rect.empty?

  @content&.rect = rect
  @popups.each(&:reposition)
end

    		
  





    
      

  

  
    #modal_popup  ⇒ Component::Popup? 
  

  

  


  

    
@return — the topmost modal overlay, or nil when
only bare Component::Overlays (or none) are open. This is the "modal
owner": the popup that scopes key dispatch, blocks mouse clicks, and
confines Tab cycling. Bare overlays are excluded — they float above the
content without capturing input.


  





  

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# File 'lib/tuile/screen_pane.rb', line 132

def modal_popup = @popups.reverse_each.find(&:modal?)

    		
  





    
      

  

  
    #on_child_removed(child)  ⇒ void 
  

  

  


  

    
This method returns an undefined value.
Focus repair when a child detaches. Default Component#on_child_removed
would refocus to self (the pane), which isn't a useful focus target.
Instead, route focus to the first interactable widget in the now-topmost
modal popup; falling back to the focus snapshotted when this popup was opened
(if still attached and still focusable); then to the first interactable
widget in #content; then to #content itself; then nil.


"First interactable widget" = first Component#tab_stop? in pre-order;
if a scope has no tab stops at all (a borderless ESC-to-close popup, or
tiled content made entirely of Component::Labels), we focus the scope's root so
q/ESC still has somewhere to dispatch from.


@param child


  





  
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# File 'lib/tuile/screen_pane.rb', line 259

def on_child_removed(child)
  return unless attached?

  f = screen.focused
  return if f.nil?

  cursor = f
  while cursor
    if cursor == child
      fallback = first_tab_stop_or_root(modal_popup)
      if fallback.nil? && @removing_popup_prior&.attached? && @removing_popup_prior.focusable?
        fallback = @removing_popup_prior
      end
      fallback ||= first_tab_stop_or_root(@content)
      screen.focused = fallback
      return
    end
    cursor = cursor.parent
  end
end

    		
  





    
      

  

  
    #rect=(new_rect)  ⇒ void 
  

  

  


  

    
This method returns an undefined value.
Re-lays out children whenever the pane's own rect changes.


@param new_rect


  





  
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# File 'lib/tuile/screen_pane.rb', line 137

def rect=(new_rect)
  super
  layout
end

    		
  





    
      

  

  
    #remove_popup(window)  ⇒ void 
  

  

  


  

    
This method returns an undefined value.
Removes a popup. If the popup held focus, focus shifts to the now-topmost
remaining popup, falling back to the focus snapshotted when the popup
was opened (if still attached), then to #content, then to nil.


@param window


  





  
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# File 'lib/tuile/screen_pane.rb', line 90

def remove_popup(window)
  raise Tuile::Error, "#{window} is not an open popup on this pane" unless @popups.delete(window)

  prior = @popup_prior_focus.delete(window)
  @removing_popup_prior = prior
  remove_child(window)
  # Runs after the detach, so a prior pointing *inside* the removed popup is
  # detectable via `p.root == window`: forward it to *our* prior, so chained
  # closures climb back to the original owner instead of stopping at a
  # detached component.
  @popup_prior_focus.transform_values! { |p| p && p.root == window ? prior : p }
ensure
  @removing_popup_prior = nil
end

    		
  





    
      

  

  
    #repaint  ⇒ void 
  

  

  


  

    
This method returns an undefined value.
Pane paints nothing itself; its children paint over the entire rect.


  





  



  

    
      


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# File 'lib/tuile/screen_pane.rb', line 157

def repaint; end