Add Christoph Hetz's all new, all singing, and all dancing input fields
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eknauel
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commit
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Input-fields
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============
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1. Erstellen und installieren
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-----------------------------
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(make-input-field x-dim y-dim) -> <input-field>
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erstellt ein Input-field mit x-dim Spalten und y-dim Zeilen.
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Make-input-field können weitere optinale Parameter übergeben
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werden:
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(make-input-field x-dim y-dim
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[default-text
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[behavior
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[insert-active
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[x-scroll-enabled
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[y-scroll-enabled]]]]])
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default-text: ist ein String, der am Anfang und nach einem Reset (s.u.)
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der Inhalt des Input-fields ist.
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(Default: "")
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behavior: ist eine Liste von Paaren. Der car eines solchen Paares
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ist die Nummer eines Zeichens oder einer Tastenkombination,
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wie sie von wgetch (aus ncurses) zurückgegeben werden.
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Der cdr des Paares ist ein Symbol, das eine Nachricht an ein
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Input-field darstellt, so würde ein Input-field, das mit dem
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Behvior
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(list (cons 27
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'clear))
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erzeugt worden ist beim drücken der ESC-Taste seinen Inhalt
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löschen.Es stehen zwei Standardlisten zu Verfügung:
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standard-behavior und standard-behavior-pro (s.u.).
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(Default: standard-behavior)
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insert-active: ist ein Boolean und gibt an ob das sich das Input-field am
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Anfang im Insert- oder im Overwrite-Modus befindet.
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(Default: #t)
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x-scroll-enabled: ist ein Boolean und gibt an ob horizontales Scrollen
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erlaubt ist.
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(Default #f)
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y-scroll-enabled: ist ein Boolean und gibt an, ob vertikales Scrollen erlaubt ist.
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(Default #f)
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(install-input-field input-field
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window
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x-loc y-loc)
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Ordnet das Input-field input-field dem (ncurses-)Fenter window zu und
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platziert es mit der linken oberen Ecke in der Spalte x-loc und der
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Zeile y-loc.
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Will man das Input-field später nicht direkt verwenden, sondern nur
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über cursor-over-input-field? (s.u.) so kann man es auch mittels
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make&install-input-field auf einmal erzeugen und installieren:
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(make&install-input-field window
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x-loc y-loc
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x-dim y-dim
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[...])
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2. Typpredikat und Feldselektoren
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----------------------------------
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Input-fields exportirt außerdem ein Typpredikat:
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input-field?
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und die folgenden Selektoren
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input-field-default-text: default-text
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input-field-text: der aktuelle Inhalt des Input-fields
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als String
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input-field-x-location: x-loc
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input-field-y-location: y-loc
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input-field-x-size: x-dim
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input-field-y-size: y-dim
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input-field-x-scroll: x-scroll-enabled
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input-field-y-scroll: y-scroll-enabled
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input-field-line: die Zeile, in der der Cursor steht
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input-field-column: die Spalte, in der der Cursor steht
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input-field-insert: insert-active
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3. Bahaviors
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----------------------
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standard-behavior führt die folgenden Bindungen ein:
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Pfeil-Hoch : Cursor um eine Zeile nach oben bewegen.
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Pfeil-Runter: Cursor um eine Zeile nach unten bewegen.
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Pfeil-links: Cursor nach links bewegen.
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Pfeil-Rechts: Cursor nach rechts bewegen.
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Home: An den Anfang der Zeile springen.
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End: Ans Ende der Zeile springen.
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Backspace: Zeichen vor dem Cursor löschen.
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Delete: Zeichen unter dem Cursor löschen
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standard-behavior-pro erweitert standard-behavior um die
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folgenden Bindungen:
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C-p: Cursor um eine Zeile nach oben bewegen.
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C-n: Cursor um eine Zeile nach unten bewegen.
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C-b: Cursor nach links bewegen.
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C-f: Cursor nach rechts bewegen.
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C-a: An den Anfang der Zeile springen.
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C-e: Ans Ende der Zeile springen.
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C-d: Zeichen unter dem Cursor löschen.
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C-k: alles rechts vom Cursor löschen.
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die folgenden (hoffentlich) selbsterklärenden Symbole stehen
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zum Erstellen von Behaviors zu verfügung:
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'move-prev-line
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'move-next-line
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'move-left
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'move-right
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'move-forawrd - wie move-right, springt aber nach Ende der Zeile
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auf den Anfang der Nächsten.
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'move-backward - equivalent zu 'move-forward
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'goto-begin-of-line
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'goto-end-of-line
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'goto-begin-of-first-line
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'goto-begin-of-last-line
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'goto-begin-of-word-forward
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'goto-begin-of-word-backward
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'delete-left
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'delete-right
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'delete-all-left
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'delete-all-right
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'delete-line
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'restore: Synchronisiert inrterne Daten mit externer Darstellung
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und Zeichent das Input-field neu.
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(war bisher nicht nötig, aber sobald Sonderzeichen erlaubt
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sind.... ;-)
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Außerdem zeichnet die Funktion
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(input-field-refresh input-field)
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das Input-field neu.
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4. Cursor-over-inputfield? und send-input-field
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-----------------------------------------------
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(cursor-over-input-field? window) -> #f | input-field
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liefert, wenn der Cursor im Fenster window über einem zuvor installiertem
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Input-field steht, dieses Input-field zurück, ansonsten #f.
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(send-input-field input-field integer) -> (values boolean boolean)
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übergibt dem Input-field input-field die Zahl integer. Das Input-field
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schaut zuerst, ob es sich um eine im Behavior gebundene Zahl handelt und
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führt, falls dies der Fall ist die entsprechende Aktion aus. Falls integer
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nicht im Behavior gebunden ist überprüft das Input-field ob es sich um einen
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gültigen zum Einfügen gültigen Ascii-code (32-126) handelt und fügt das
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entsprechende Zeichen gegebenenfalls an der aktuellen Cursorposition ein.
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5. Position, Größe, Scrolleigenschaften nachträglich verändern
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--------------------------------------------------------------
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;; TODOOO
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hierzu stehen folgende Funktionen zur Verfügung:
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(input-field-reset input-field) - stellt den default-text wieder her
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(input-field-clear input-field) - löscht den Inhalt
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(input-field-move input-field x-loc y-loc) - setzt die linke, obere Ecke auf (x-loc y-loc)
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(input-field-resize input-field x-dim y-dim) - setzt ...
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(input-field-toggle-x-scroll input-field)
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(input-field-toggle-y-scroll input-field)
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@ -0,0 +1,217 @@
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(define NULL (ascii->char 0))
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(define demo
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(lambda ()
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(let ((win (init-screen)))
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(keypad win #t)
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(noecho)
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(make&install-input-field win
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20 10
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42 23
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"
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+----------------------------------+
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| f1 : move left input-field |
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| f2 : move right input-field |
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| f3 : move up input-field |
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| f4 : move down input-field |
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| f5 : make bigger in x direction |
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| f6 : make smaler in x direction |
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| f7 : make bigger in y direction |
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| f8 : make smaler in y direction |
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| f9 : toggle x-scroll |
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| f10 : toggle y-scroll |
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| f11 : clear |
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| f12 : reset |
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| tab : toggle insert |
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| ESC : quit |
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+----------------------------------+
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0-0 0-1 0-2 0-3 0-4 0-5
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1-0 1-1 1-2 1-3 1-4 1-5 1-6
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2-0 2-1 2-2 2-3 2-4 2-5 2-6 2-7
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3-0 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8
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4-0 4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9
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5-0 5-1 5-2 5-3 5-4 5-5 5-6 5-7 5-8 4-9
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6-0 6-1 6-2 6-3 6-4 6-5 6-6 6-7 6-8
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7-0 7-1 7-2 7-3 7-4 7-5 7-6 7-7
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8-0 8-1 8-2 8-3 8-4 8-5 8-6
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9-0 9-1 9-2 9-3 9-4 9-5\n"
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(append
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(list (cons 9 ;; tab
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'toggle-insert)
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(cons key-ppage
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'move-backward)
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(cons key-npage
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'move-forward))
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standard-behavior-pro)
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#t #t #t)
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(wmove win 10 20)
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(screen-refresh win)
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(letrec ((else-loop (lambda (asc)
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(let ((infl (cursor-over-input-field? win)))
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(cond ((= asc 27)
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(wclear win)
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(clear)
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(echo)
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(endwin))
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((= asc key-f1)
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(input-field-move infl
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(- (input-field-x-location infl)
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1)
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(input-field-y-location infl))
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(screen-refresh win)
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(loop (wgetch win)))
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((= asc key-f2)
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(input-field-move infl
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(+ (input-field-x-location infl)
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1)
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(input-field-y-location infl))
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(screen-refresh win)
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(loop (wgetch win)))
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((= asc key-f3)
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(input-field-move infl
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(input-field-x-location infl)
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(- (input-field-y-location infl)
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1))
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(screen-refresh win)
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(loop (wgetch win)))
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((= asc key-f4)
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(input-field-move infl
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(input-field-x-location infl)
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(+ (input-field-y-location infl)
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1))
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(screen-refresh win)
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(loop (wgetch win)))
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((= asc key-f5)
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(input-field-resize infl
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(+ (input-field-x-size infl)
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1)
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(input-field-y-size infl))
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(screen-refresh win)
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(loop (wgetch win)))
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((= asc key-f6)
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(input-field-resize infl
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(- (input-field-x-size infl)
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1)
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(input-field-y-size infl))
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(screen-refresh win)
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(loop (wgetch win)))
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((= asc key-f7)
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(input-field-resize infl
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(input-field-x-size infl)
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(+ (input-field-y-size infl)
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1))
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(screen-refresh win)
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(loop (wgetch win)))
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((= asc key-f8)
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(input-field-resize infl
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(input-field-x-size infl)
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(- (input-field-y-size infl)
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1))
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(screen-refresh win)
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(loop (wgetch win)))
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((= asc key-f9)
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(input-field-toggle-x-scroll infl)
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(wrefresh win)
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(loop (wgetch win)))
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((= asc key-f10)
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(input-field-toggle-y-scroll infl)
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(wrefresh win)
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(loop (wgetch win)))
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((= asc key-f11)
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(input-field-clear infl)
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(wrefresh win)
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(loop (wgetch win)))
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((= asc key-f12)
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(input-field-reset infl)
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(wrefresh win)
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(loop (wgetch win)))
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(else (loop (wgetch win)))))))
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(loop (lambda (asc)
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(cond ((cursor-over-input-field? win)
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=> (lambda (infl)
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(call-with-values
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(lambda ()
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(send-input-field infl asc))
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(lambda (was-known is-changed)
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(if is-changed
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(begin
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(wrefresh win)
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(loop (wgetch win)))
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(if was-known
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(loop (wgetch win))
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(else-loop asc)))))))))))
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(loop (wgetch win))))))
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(define screen-refresh
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(lambda (screen)
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(let ((infl (cursor-over-input-field? screen))
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(x (getx screen))
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(y (gety screen)))
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(wclear screen)
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(input-field-refresh infl)
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(wdraw-box screen
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(- (input-field-x-location infl) 1)
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(- (input-field-y-location infl) 1)
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(+ (input-field-x-size infl) 2)
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(+ (input-field-y-size infl) 2))
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(wmove screen y x)
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(wrefresh screen))))
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(define wdraw-box
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(lambda (win x y dimx dimy)
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(mvwaddstr win
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y
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x "+")
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(mvwaddstr win
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y
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(+ dimx
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(- x
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1)) "+")
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(mvwaddstr win
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(+ dimy
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(- y
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1))
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x "+")
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(mvwaddstr win
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(+ dimy
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(- y
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1))
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(+ dimx
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(- x
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1)) "+")
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(let loop-x ((dx (+ x 1)))
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(if (= dx (+ x (- dimx 2)))
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(begin
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(mvwaddstr win y dx "-")
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(mvwaddstr win (+ dimy
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(- y
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1)) dx "-"))
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(begin
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(mvwaddstr win y dx "-")
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(mvwaddstr win (+ dimy
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(- y
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1)) dx "-")
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(loop-x (+ dx 1)))))
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(let loop-y ((dy (+ y 1)))
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(if (= dy (+ y (- dimy 2)))
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(begin
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(mvwaddstr win dy x "|")
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(mvwaddstr win dy (+ dimx
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(- x
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1)) "|"))
|
||||||
|
(begin
|
||||||
|
(mvwaddstr win dy x "|")
|
||||||
|
(mvwaddstr win dy (+ dimx
|
||||||
|
(- x
|
||||||
|
1)) "|")
|
||||||
|
(loop-y (+ dy 1)))))))
|
||||||
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Reference in New Issue