mirror of
https://gitlab.com/eql/EQL5.git
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116 lines
3.6 KiB
Common Lisp
116 lines
3.6 KiB
Common Lisp
;;;
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;;; * enables QML to call Lisp functions
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;;; * allows to get/set any QML property from Lisp (needs 'objectName' to be set)
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;;; * allows to evaluate JS code from Lisp (needs 'objectName' to be set)
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;;;
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;;; (requires a C++ plugin, see "lib/")
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(defpackage :qml-lisp
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(:use :common-lisp :eql)
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(:nicknames :qml)
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(:export
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#:*quick-view*
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#:find-qml-object
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#:js
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#:qml-get
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#:qml-set
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#:root-object))
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(provide :qml-lisp)
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(in-package :qml-lisp)
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(defvar *qml-lisp* (qload-c++ "lib/qml_lisp"))
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(defvar *quick-view* nil)
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(defun string-to-symbol (name)
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(let* ((upper (string-upcase name))
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(p (position #\: name)))
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(if p
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(intern (subseq upper (1+ (position #\: name :from-end t)))
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(subseq upper 0 p))
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(intern upper))))
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;;; function calls from QML
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(defun print-js-readably (object)
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"Prints (nested) lists, vectors, T, NIL, floats in JS notation, which will be passed to JS 'eval()'."
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(if (and (not (stringp object))
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(vectorp object))
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(print-js-readably (coerce object 'list))
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(typecase object
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(cons
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(write-char #\[)
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(do ((list object (rest list)))
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((null list) (write-char #\]))
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(print-js-readably (first list))
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(when (rest list)
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(write-char #\,))))
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(float
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;; cut off Lisp specific notations
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(princ (string-right-trim "dl0" (princ-to-string object))))
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(t
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(cond ((eql 't object)
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(princ "true"))
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((eql 'nil object)
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(princ "false"))
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(t
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(prin1 object)))))))
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(defun print-to-js-string (object)
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(with-output-to-string (*standard-output*)
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(princ "#<>") ; mark for passing to JS "eval()"
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(print-js-readably object)))
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(defun qml-apply (function arguments)
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"Every 'Lisp.fun()' or 'Lisp.apply()' function call in QML will call this function."
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(let ((object (apply (string-to-symbol function)
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arguments)))
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(if (stringp object)
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object
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(print-to-js-string object))))
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;;; utils
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(let (root-object)
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(defun root-object ()
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(unless root-object
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(setf root-object (|rootObject| *quick-view*)))
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root-object))
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(defun find-qml-object (&optional object-name)
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"Finds the first QML item matching OBJECT-NAME."
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(if (string= (|objectName| (root-object)) object-name)
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(root-object)
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(qfind-child (root-object) object-name)))
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;;; get/set QQmlProperty
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(defun qml-get (object-name property-name)
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"Gets QQmlProperty for first object matching 'objectName'."
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(qlet ((property "QQmlProperty(QObject*,QString)"
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(find-qml-object object-name)
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property-name)
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(variant (|read| property)))
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(qvariant-value variant)))
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(defun qml-set (object-name property-name value)
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"Sets QQmlProperty for first object matching 'objectName'. Returns T on success."
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(qlet ((property "QQmlProperty(QObject*,QString)"
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(find-qml-object object-name)
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property-name))
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(x:when-it (|propertyTypeName| property)
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(qlet ((variant (qvariant-from-value value x:it)))
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(|write| property variant)))))
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;;; JS
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(defun js (object-name js-format-string &rest arguments)
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"Evaluates a JS string with the element bound to OBJECT-NAME as 'this'."
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(qlet ((qml-exp "QQmlExpression(QQmlContext*,QObject*,QString)"
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(|rootContext| *quick-view*)
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(find-qml-object object-name)
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(apply 'format nil js-format-string arguments))
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(variant (|evaluate| qml-exp)))
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(qvariant-value variant)))
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