472 lines
17 KiB
Scheme
472 lines
17 KiB
Scheme
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;;; SUrflets' input fields
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;;; Copyright 2002, 2003 Andreas Bernauer
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Functions to create simple input fields
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;; The interface for input-fields does not prescribe what the type of
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;; attributes has to be. We choose a record here.
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(define-record-type input-field-attributes :input-field-attributes
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(make-input-field-attributes default others)
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input-field-attributes?
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(default input-field-attributes-default set-input-field-attributes-default!)
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(others input-field-attributes-others set-input-field-attributes-others!))
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;; A simple input-field is a prototype for other input-fields.
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;; REPORTED-TYPE is the type of the input-field in HTML, TYPE the
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;; internal referenced type and TRANSFORMER the function that
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;; translates the HTTP-string of the request into a scheme value.
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(define (simple-input-field-maker reported-type type default-pred transformer)
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(lambda maybe-further-attributes
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(let ((name (generate-input-field-name type)))
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(optionals maybe-further-attributes
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((default default-pred)
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(attributes sxml-attribute?))
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(make-input-field name type
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transformer
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(make-input-field-attributes
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(and default `(value ,default))
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(sxml-attribute-attributes attributes))
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(simple-input-field-maker-html-tree-maker
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reported-type))))))
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(define (simple-input-field-maker-html-tree-maker reported-type)
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(lambda (input-field)
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(let ((attributes (input-field-attributes input-field)))
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`(input (@ (type ,reported-type)
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(name ,(input-field-name input-field))
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,(input-field-attributes-default attributes)
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,(input-field-attributes-others attributes))))))
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(define (make-simple-input-field-default-setter default-pred? wrap?)
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(lambda (input-field value)
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(if (default-pred? value)
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(set-input-field-attributes-default!
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(input-field-attributes input-field)
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(if wrap? `(value ,value) value))
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(error "Default value must be a number or a string or a symbol."
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value))
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(touch-input-field! input-field)))
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(define (string-or-symbol? thing)
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(or (string? thing) (symbol? thing)))
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(define simple-default? string-or-symbol?)
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(define set-simple-input-field-default!
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(make-simple-input-field-default-setter simple-default? #t))
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;;;;;;;;;;;;;;;;;;;;
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;;; Text input field
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(define make-text-input-field
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(simple-input-field-maker "text" "text"
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simple-default? identity))
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(define set-text-input-field-value! set-simple-input-field-default!)
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;;;;;;;;;;;;;;;;;;;;;;
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;;; Number input field
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(define (number-input-field-default? value)
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(or (number? value)
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(simple-default? value)))
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(define (number-input-field-transformer string)
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(or (string->number string)
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(error "wrong type")))
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(define make-number-input-field
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(simple-input-field-maker "text" "number"
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number-input-field-default?
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number-input-field-transformer))
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(define set-number-input-field-value!
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(make-simple-input-field-default-setter number-input-field-default? #t))
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;;;;;;;;;;;;;;;;;;;;;;
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;;; hidden input-field
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;; Little workaraound, as a hidden input-field needs a value. This
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;; value is propagated in the slot "default value".
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(define make-hidden-input-field
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(let ((hidden-input-field-generator
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(simple-input-field-maker "hidden" "text"
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simple-default? identity)))
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(lambda (value . maybe-further-attributes)
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(apply hidden-input-field-generator
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(cons value maybe-further-attributes)))))
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(define set-hidden-input-field-value!
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set-simple-input-field-default!)
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;;;;;;;;;;;;;;;;;;;;;;;;
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;;; Password input field
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(define make-password-input-field
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(simple-input-field-maker "password" "password"
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simple-default? identity))
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(define set-password-input-field-value!
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set-simple-input-field-default!)
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;;; That's it for simple input fields.
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;;;;;;;;;;;;;;;;;;;;;;;;
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;;; Textarea input field
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(define (make-textarea-input-field . maybe-further-attributes)
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(let ((name (generate-input-field-name "textarea")))
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(optionals maybe-further-attributes
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((default-text simple-default?)
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(attributes sxml-attribute?))
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(make-input-field
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name "textarea"
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identity
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(make-input-field-attributes
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(and default-text)
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(sxml-attribute-attributes attributes))
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make-textarea-input-field-html-tree))))
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(define (make-textarea-input-field-html-tree input-field)
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(let ((attributes (input-field-attributes input-field)))
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`(textarea (@ (type "textarea")
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(name ,(input-field-name input-field))
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,(input-field-attributes-others attributes))
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,(input-field-attributes-default attributes))))
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(define set-textarea-input-field-value!
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(let ((textarea-default-setter!
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(make-simple-input-field-default-setter simple-default? #f)))
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(lambda (textarea-input-field value)
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(textarea-default-setter! textarea-input-field value))))
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;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; Selection input field
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;; sel-if == select-input-field
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;(make-select-input-fields '("this" "that" "those") '(@ ((id "sushi"))))
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;(make-select-input-fields '("this" ("that" '(@ (selected))) "those"))
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;; dropdown: (size 1)
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;;; A selection input field shows a list of options that can be
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;;; selected. For this purpose, we introduce an sel-if-option record,
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;;; that contains all the information for each option. This is
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;;; justified by the fact, that the options list is in HTML seperated,
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;;; too.
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(define-record-type sel-if-option :sel-if-option
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(really-make-sel-if-option tag value selected? attributes)
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sel-if-option?
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(tag sel-if-option-tag)
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(value sel-if-option-value)
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(selected? sel-if-option-selected? set-sel-if-option-selected?!)
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(attributes sel-if-option-attributes set-sel-if-option-attributes!))
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(define (make-sel-if-option tag value selected? attributes)
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(if (string? tag)
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(really-make-sel-if-option tag value selected?
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(sxml-attribute-attributes attributes))
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(error "Select-input-field-option's tag must be a string." tag)))
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;; Constructor for valued select input-field option.
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(define (make-annotated-sel-if-option tag value . maybe-attributes)
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(optionals maybe-attributes
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((selected? boolean?)
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(attributes sxml-attribute?))
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(make-sel-if-option tag value selected? attributes)))
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;; Constructor for a simple select input-field option (not annotated).
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(define (make-simple-sel-if-option tag . maybe-attributes)
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(optionals maybe-attributes
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((selected? boolean?)
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(attributes sxml-attribute?))
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(make-sel-if-option tag 'ignored selected? attributes)))
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(define-record-discloser :sel-if-option
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(lambda (sel-if-option)
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(list 'select-input-field-option
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(sel-if-option-tag sel-if-option)
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(sel-if-option-value sel-if-option)
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(sel-if-option-selected? sel-if-option)
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(sel-if-option-attributes sel-if-option)
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)))
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;; Selecting / Unselecting of an option in an select input-field,
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;; chosen by tag.
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(define (select-sel-if-option! tag sel-if)
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(set-select-input-field-option-selected?! tag sel-if #t))
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(define (unselect-sel-if-option! tag sel-if)
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(set-select-input-field-option-selected?! tag sel-if #f))
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(define (set-select-input-field-option-selected?! tag sel-if selected?)
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(let ((options (input-field-attributes-default
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(input-field-attributes sel-if))))
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(if (number? tag)
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(set-sel-if-option-selected?! (list-ref options tag)
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selected?)
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(let lp ((options options))
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(if (null? options)
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(error "No such option" tag sel-if)
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(if (tag=sel-if-option? tag (car options))
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(set-sel-if-option-selected?! (car options) selected?)
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(lp (cdr options))))))
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(touch-input-field! sel-if)))
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;; Find sel-if-option in a list by its tag.
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(define (tag=sel-if-option? tag sel-if-option)
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(string=? tag (sel-if-option-tag sel-if-option)))
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(define (find-sel-if-option tag sel-if-options)
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(cond ((member/srfi-1 tag sel-if-options tag=sel-if-option?)
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=> car)
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(else #f)))
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(define (find-sel-if-option-value tag sel-if-options)
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(cond ((find-sel-if-option tag sel-if-options)
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=> sel-if-option-value)
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(else #f)))
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;; To be compatible with previous versions of MAKE-SELECT-INPUT-FIELD,
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;; we accept also a simple list as an option-list. New programs should
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;; use sel-if-options-list (easily createable with
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;; (map make-simple-sel-if-option option-list))
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(define (tolerate-old-sel-if-options sel-if-options)
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(if (and (list? sel-if-options)
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(every sel-if-option? sel-if-options))
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sel-if-options
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(map make-simple-sel-if-option sel-if-options)))
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(define (make-select-input-field sel-if-options . maybe-further-attributes)
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(really-make-select-input-field (tolerate-old-sel-if-options sel-if-options)
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#f
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maybe-further-attributes))
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(define (make-annotated-select-input-field sel-if-options .
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maybe-further-attributes)
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(really-make-select-input-field sel-if-options #t maybe-further-attributes))
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(define (really-make-select-input-field sel-if-options annotated?
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maybe-further-attributes)
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(let ((real-sel-if-options (tolerate-old-sel-if-options sel-if-options)))
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(optionals maybe-further-attributes
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((multiple? boolean?)
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(attributes sxml-attribute?))
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(let ((name (generate-input-field-name "select")))
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(if multiple?
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(make-multiple-select-input-field name sel-if-options
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annotated? attributes)
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(make-single-select-input-field name sel-if-options
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annotated? attributes))))))
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;; internal
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(define (make-multiple-select-input-field name sel-if-options
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annotated? attributes)
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(make-multi-input-field name "mult-select"
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(make-sel-if-multiple-transformer name sel-if-options
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annotated?)
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(make-input-field-attributes
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sel-if-options
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(list '(multiple)
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(sxml-attribute-attributes attributes)))
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make-sel-if-html-tree))
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;; internal
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(define (make-single-select-input-field name sel-if-options
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annotated? attributes)
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(make-input-field name "select"
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(if annotated?
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(lambda (tag)
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(cond ((find-sel-if-option-value tag sel-if-options)
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=> identity)
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(else (error "no such option." tag))))
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identity)
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(make-input-field-attributes
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sel-if-options
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(sxml-attribute-attributes attributes))
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make-sel-if-html-tree))
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(define (make-sel-if-multiple-transformer name sel-if-options annotated?)
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(lambda (bindings)
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(let ((tags (map cdr
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(filter (lambda (binding)
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(equal? (car binding) name))
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bindings))))
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(filter-map (if annotated?
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(lambda (tag)
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(find-sel-if-option-value tag sel-if-options))
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(lambda (tag)
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(if (find-sel-if-option tag sel-if-options)
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tag
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#f)))
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tags))))
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(define (make-sel-if-html-tree sel-if)
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(let ((attributes (input-field-attributes sel-if)))
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`(select (@ (name ,(input-field-name sel-if))
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,(input-field-attributes-others attributes))
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#\newline
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,@(make-sel-if-options-html-tree
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(input-field-attributes-default attributes)))))
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(define (make-sel-if-options-html-tree sel-if-options)
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(map (lambda (sel-if-option)
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`(option (@ ,(and (sel-if-option-selected? sel-if-option) '(selected))
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,(sel-if-option-attributes sel-if-option))
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,(sel-if-option-tag sel-if-option)))
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sel-if-options))
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;;;;;;;;;;;;;;;;;;;;;;
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;;; radio input-fields
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;; Because grouped radio input-fields must use the same name, we
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;; cannot just return one radio input-field object, but we must
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;; generate several ones with the same name.
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(define (make-radio-input-field-group)
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(let ((name (generate-input-field-name "radio")))
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(lambda (value-string . maybe-further-attributes)
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(optionals maybe-further-attributes
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((checked? boolean?)
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(attributes sxml-attribute?))
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(make-input-field name "radio"
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identity
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(make-input-field-attributes
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(if checked? '(checked) #f)
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(list `(value ,value-string)
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(sxml-attribute-attributes attributes)))
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radio-input-field-html-tree-maker)))))
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(define (make-annotated-radio-input-field-group)
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(let* ((name (generate-input-field-name "radio"))
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(value-table (make-integer-table))
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(transformer (make-radio-input-field-transformer value-table)))
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(lambda (value . maybe-further-attributes)
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(optionals maybe-further-attributes
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((checked? boolean?)
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(attributes sxml-attribute?))
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(let ((number (generate-unique-number)))
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(table-set! value-table number value)
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(make-input-field name "radio"
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transformer
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(make-input-field-attributes
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(if checked? '(checked) #f)
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(list`(value ,(number->string number))
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(sxml-attribute-attributes attributes)))
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radio-input-field-html-tree-maker))))))
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(define (make-radio-input-fields values . maybe-further-attributes)
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(optionals maybe-further-attributes
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|
|
((attributes sxml-attribute?))
|
||
|
|
(let ((radio-gen (make-annotated-radio-input-field-group)))
|
||
|
|
(map (lambda (value)
|
||
|
|
(if attributes
|
||
|
|
(radio-gen value attributes)
|
||
|
|
(radio-gen value)))
|
||
|
|
values))))
|
||
|
|
|
||
|
|
|
||
|
|
(define (make-radio-input-field-transformer value-table)
|
||
|
|
(lambda (tag)
|
||
|
|
(cond
|
||
|
|
((string->number tag) =>
|
||
|
|
(lambda (number)
|
||
|
|
(let ((value (table-ref value-table number)))
|
||
|
|
(if value
|
||
|
|
value
|
||
|
|
(error "Unknown tag number for radio input-field" tag)))))
|
||
|
|
(else
|
||
|
|
(error "Unknown tag number for radio input-field" tag)))))
|
||
|
|
|
||
|
|
(define (radio-input-field-html-tree-maker radio-input-field)
|
||
|
|
(let* ((attributes (input-field-attributes radio-input-field)))
|
||
|
|
`(input (@ ((type "radio")
|
||
|
|
(name ,(input-field-name radio-input-field))
|
||
|
|
,(input-field-attributes-default attributes)
|
||
|
|
,(input-field-attributes-others attributes))))))
|
||
|
|
|
||
|
|
(define (set-input-field-checked?! input-field checked?)
|
||
|
|
(let ((attributes (input-field-attributes input-field)))
|
||
|
|
(set-input-field-attributes-default!
|
||
|
|
attributes
|
||
|
|
(if checked? '(checked) #f))
|
||
|
|
(touch-input-field! input-field)))
|
||
|
|
|
||
|
|
(define set-radio-input-field-checked?! set-input-field-checked?!)
|
||
|
|
(define (check-radio-input-field! radio)
|
||
|
|
(set-radio-input-field-checked?! radio #t))
|
||
|
|
(define (uncheck-radio-input-field! radio)
|
||
|
|
(set-radio-input-field-checked?! radio #f))
|
||
|
|
;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
|
;;; checkbox input-field
|
||
|
|
(define (make-checkbox-input-field . maybe-further-attributes)
|
||
|
|
(really-make-checkbox-input-field #t
|
||
|
|
checkbox-transformer
|
||
|
|
maybe-further-attributes))
|
||
|
|
|
||
|
|
(define (make-annotated-checkbox-input-field value . maybe-further-attributes)
|
||
|
|
(really-make-checkbox-input-field value
|
||
|
|
(make-checkbox-transformer value)
|
||
|
|
maybe-further-attributes))
|
||
|
|
|
||
|
|
(define (really-make-checkbox-input-field value transformer attributes)
|
||
|
|
(let ((name (generate-input-field-name "checkbox")))
|
||
|
|
(optionals attributes
|
||
|
|
((checked? boolean?)
|
||
|
|
(attributes sxml-attribute?))
|
||
|
|
(make-input-field name "checkbox"
|
||
|
|
transformer
|
||
|
|
(make-input-field-attributes
|
||
|
|
(if checked? '(checked) #f)
|
||
|
|
(sxml-attribute-attributes attributes))
|
||
|
|
checkbox-input-field-html-tree-maker))))
|
||
|
|
|
||
|
|
(define (make-checkbox-transformer value)
|
||
|
|
(lambda (tag)
|
||
|
|
(if (string=? tag "on")
|
||
|
|
value
|
||
|
|
#f)))
|
||
|
|
|
||
|
|
(define checkbox-transformer
|
||
|
|
(make-checkbox-transformer #t))
|
||
|
|
|
||
|
|
(define (checkbox-input-field-html-tree-maker cb-if)
|
||
|
|
(let ((attributes (input-field-attributes cb-if)))
|
||
|
|
`(input (@ ((type "checkbox")
|
||
|
|
(name ,(input-field-name cb-if))
|
||
|
|
,(input-field-attributes-default attributes)
|
||
|
|
,(input-field-attributes-others attributes))))))
|
||
|
|
|
||
|
|
(define set-checkbox-input-field-checked?! set-input-field-checked?!)
|
||
|
|
(define (check-checkbox-input-field! checkbox)
|
||
|
|
(set-checkbox-input-field-checked?! checkbox #t))
|
||
|
|
(define (uncheck-checkbox-input-field! checkbox)
|
||
|
|
(set-checkbox-input-field-checked?! checkbox #f))
|
||
|
|
;;;;;;;;;;;;;;;;;;;;;;
|
||
|
|
;; button input-fields
|
||
|
|
(define (make-button type name button-caption attributes)
|
||
|
|
(make-input-field name type
|
||
|
|
identity
|
||
|
|
(make-input-field-attributes
|
||
|
|
(and button-caption `(value ,button-caption))
|
||
|
|
(sxml-attribute-attributes attributes))
|
||
|
|
make-button-html-tree))
|
||
|
|
|
||
|
|
(define (make-button-html-tree button-input-field)
|
||
|
|
(let ((attributes (input-field-attributes button-input-field)))
|
||
|
|
`(input (@ (type ,(input-field-type button-input-field))
|
||
|
|
(name ,(input-field-name button-input-field))
|
||
|
|
,(input-field-attributes-default attributes)
|
||
|
|
,(input-field-attributes-others attributes)))))
|
||
|
|
|
||
|
|
(define (make-submit-button . maybe-further-attributes)
|
||
|
|
(optionals maybe-further-attributes
|
||
|
|
((button-caption string?)
|
||
|
|
(attributes sxml-attribute?))
|
||
|
|
(make-button "submit" (generate-input-field-name "submit")
|
||
|
|
button-caption attributes)))
|
||
|
|
|
||
|
|
(define (make-reset-button . maybe-further-attributes)
|
||
|
|
(optionals maybe-further-attributes
|
||
|
|
((button-caption string?)
|
||
|
|
(attributes sxml-attribute?))
|
||
|
|
(make-button "reset" (generate-input-field-name "reset")
|
||
|
|
button-caption attributes)))
|
||
|
|
|
||
|
|
(define (make-image-button image-source . maybe-further-attributes)
|
||
|
|
(optionals maybe-further-attributes
|
||
|
|
((attributes sxml-attribute?))
|
||
|
|
(make-button "image" (generate-input-field-name "imgbtn")
|
||
|
|
#f `(@ (src ,image-source)
|
||
|
|
,@(sxml-attribute-attributes attributes)))))
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
;;EOF
|