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core.py
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core.py
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import logging, string
########################################################################################################################
# DOM-access functions and variables
########################################################################################################################
try:
# Pyodide
from js import window, eval as jseval
document = window.document
except:
print("Emulation mode")
from xml.dom.minidom import parseString
jseval = None
window = None
document = parseString("<html><head /><body /></html>")
def domCreateAttribute(tag, ns=None):
"""
Creates a new HTML/SVG/... attribute
:param ns: the namespace. Default: HTML. Possible values: HTML, SVG, XBL, XUL
"""
uri = None
if ns == "SVG":
uri = "http://www.w3.org/2000/svg"
elif ns == "XBL":
uri = "http://www.mozilla.org/xbl"
elif ns == "XUL":
uri = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
if uri:
return document.createAttribute(uri, tag)
return document.createAttribute(tag)
def domCreateElement(tag, ns=None):
"""
Creates a new HTML/SVG/... tag
:param ns: the namespace. Default: HTML. Possible values: HTML, SVG, XBL, XUL
"""
uri = None
if ns == "SVG":
uri = "http://www.w3.org/2000/svg"
elif ns == "XBL":
uri = "http://www.mozilla.org/xbl"
elif ns == "XUL":
uri = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
if uri:
return document.createElementNS(uri, tag)
return document.createElement(tag)
def domCreateTextNode(txt=""):
return document.createTextNode(txt)
def domGetElementById(idTag):
return document.getElementById(idTag)
def domElementFromPoint(x, y):
return document.elementFromPoint(x, y)
def domGetElementsByTagName(tag):
items = document.getElementsByTagName(tag)
return [items.item(i) for i in range(0, int(items.length))] #pyodide interprets items.length as float, so convert to int
########################################################################################################################
# HTML Widgets
########################################################################################################################
# TextNode -------------------------------------------------------------------------------------------------------------
class TextNode(object):
"""
Represents a piece of text inside the DOM.
This is the *only* object not deriving from "Widget", as it does
not support any of its properties.
"""
def __init__(self, txt=None, *args, **kwargs):
super().__init__()
self._parent = None
self._children = []
self.element = domCreateTextNode(txt or "")
self._isAttached = False
def _setText(self, txt):
self.element.data = txt
def _getText(self):
return self.element.data
def __str__(self):
return self.element.data
def onAttach(self):
self._isAttached = True
def onDetach(self):
self._isAttached = False
def _setDisabled(self, disabled):
return
def _getDisabled(self):
return False
def children(self):
return []
# _WidgetClassWrapper -------------------------------------------------------------------------------------------------
class _WidgetClassWrapper(list):
def __init__(self, targetWidget):
super().__init__()
self.targetWidget = targetWidget
# Initially read content of element into current wrappper
value = targetWidget.element.getAttribute("class")
if value:
for c in value.split(" "):
list.append(self, c)
def set(self, value):
if value is None:
value = []
elif isinstance(value, str):
value = value.split(" ")
elif not isinstance(value, list):
raise ValueError("Value must be a str, a List or None")
list.clear(self)
list.extend(self, value)
self._updateElem()
def _updateElem(self):
if len(self) == 0:
self.targetWidget.element.removeAttribute("class")
else:
self.targetWidget.element.setAttribute("class", " ".join(self))
def append(self, p_object):
list.append(self, p_object)
self._updateElem()
def clear(self):
list.clear(self)
self._updateElem()
def remove(self, value):
try:
list.remove(self, value)
except:
pass
self._updateElem()
def extend(self, iterable):
list.extend(self, iterable)
self._updateElem()
def insert(self, index, p_object):
list.insert(self, index, p_object)
self._updateElem()
def pop(self, index=None):
list.pop(self, index)
self._updateElem()
# _WidgetDataWrapper ---------------------------------------------------------------------------------------------------
class _WidgetDataWrapper(dict):
def __init__(self, targetWidget):
super().__init__()
self.targetWidget = targetWidget
alldata = targetWidget.element
for data in dir(alldata.dataset):
dict.__setitem__(self, data, getattr(alldata.dataset, data))
def __setitem__(self, key, value):
dict.__setitem__(self, key, value)
self.targetWidget.element.setAttribute(str("data-" + key), value)
def update(self, E=None, **F):
dict.update(self, E, **F)
if E is not None and "keys" in dir(E):
for key in E:
self.targetWidget.element.setAttribute(str("data-" + key), E["data-" + key])
elif E:
for (key, val) in E:
self.targetWidget.element.setAttribute(str("data-" + key), "data-" + val)
for key in F:
self.targetWidget.element.setAttribute(str("data-" + key), F["data-" + key])
# _WidgetStyleWrapper --------------------------------------------------------------------------------------------------
class _WidgetStyleWrapper(dict):
def __init__(self, targetWidget):
super().__init__()
self.targetWidget = targetWidget
style = targetWidget.element.style
for key in style.object_values():
self[key] = style.getPropertyValue(key)
def __setitem__(self, key, value):
dict.__setitem__(self, key, value)
self.targetWidget.element.style.setProperty(key, value)
def update(self, E=None, **F):
dict.update(self, E, **F)
if E is not None and "keys" in dir(E):
for key in E:
self.targetWidget.element.style.setProperty(key, E[key])
elif E:
for (key, val) in E:
self.targetWidget.element.style.setProperty(key, val)
for key in F:
self.targetWidget.element.style.setProperty(key, F[key])
# Widget ---------------------------------------------------------------------------------------------------------------
class Widget(object):
_tagName = None # Defines the tag-name that is used for DOM-Element construction
_leafTag = False # Defines whether ths Widget may contain other Widgets (default) or is a leaf
_namespace = None # Namespace
_parserTagName = None # Alternative tag name under which this Widget is registered in HTML parser
style = [] # CSS-classes to directly assign to this Widget at construction.
def __init__(self, *args, appendTo=None, style=None, **kwargs):
if "_wrapElem" in kwargs.keys():
self.element = kwargs["_wrapElem"]
del kwargs["_wrapElem"]
else:
assert self._tagName is not None
self.element = domCreateElement(self._tagName, ns=self._namespace)
self._widgetClassWrapper = None
super().__init__()
self.addClass(self.style)
if style:
self.addClass(style)
self._children = []
self._catchedEvents = {}
self._disabledState = 0
self._isAttached = False
self._parent = None
if args:
self.appendChild(*args, **kwargs)
if appendTo:
appendTo.appendChild(self)
def sinkEvent(self, *args):
for event_attrName in args:
event = event_attrName.lower()
if event_attrName in self._catchedEvents or event in ["onattach", "ondetach"]:
continue
eventFn = getattr(self, event_attrName, None)
assert eventFn and callable(eventFn), "{} must provide a {} method".format(str(self), event_attrName)
self._catchedEvents[event_attrName] = eventFn
if event.startswith("on"):
event = event[2:]
self.element.addEventListener(event, eventFn)
def unsinkEvent(self, *args):
for event_attrName in args:
event = event_attrName.lower()
if event_attrName not in self._catchedEvents:
continue
eventFn = self._catchedEvents[event_attrName]
del self._catchedEvents[event_attrName]
if event.startswith("on"):
event = event[2:]
self.element.removeEventListener(event, eventFn)
def disable(self):
"""
Disables an element, in case it is not already disabled.
On disabled elements, events are not triggered anymore.
"""
if not self["disabled"]:
self["disabled"] = True
def enable(self):
"""
Enables an element, in case it is not already enabled.
"""
if self["disabled"]:
self["disabled"] = False
def _getTargetfuncName(self, key, type):
assert type in ["get", "set"]
return "_{}{}{}".format(type, key[0].upper(), key[1:])
def __getitem__(self, key):
funcName = self._getTargetfuncName(key, "get")
func = getattr(self, funcName, None)
if func:
return func()
return None
def __setitem__(self, key, value):
funcName = self._getTargetfuncName(key, "set")
func = getattr(self, funcName, None)
if func:
return func(value)
raise ValueError("{} is no valid attribute for {}".format(key, (self._tagName or str(self))))
def __str__(self):
return str(self.__class__.__name__)
def __iter__(self):
return self._children.__iter__()
def _getData(self):
"""
Custom data attributes are intended to store custom data private to the page or application, for which there are no more appropriate attributes or elements.
:param name:
:returns:
"""
return _WidgetDataWrapper(self)
def _getTranslate(self):
"""
Specifies whether an elements attribute values and contents of its children are to be translated when the page is localized, or whether to leave them unchanged.
:returns: True | False
"""
return True if self.element.translate == "yes" else False
def _setTranslate(self, val):
"""
Specifies whether an elements attribute values and contents of its children are to be translated when the page is localized, or whether to leave them unchanged.
:param val: True | False
"""
self.element.translate = "yes" if val == True else "no"
def _getTitle(self):
"""
Advisory information associated with the element.
:returns: str
"""
return self.element.title
def _setTitle(self, val):
"""
Advisory information associated with the element.
:param val: str
"""
self.element.title = val
def _getTabindex(self):
"""
Specifies whether the element represents an element that is is focusable (that is, an element which is part of the sequence of focusable elements in the document), and the relative order of the element in the sequence of focusable elements in the document.
:returns: number
"""
return self.element.getAttribute("tabindex")
def _setTabindex(self, val):
"""
Specifies whether the element represents an element that is is focusable (that is, an element which is part of the sequence of focusable elements in the document), and the relative order of the element in the sequence of focusable elements in the document.
:param val: number
"""
self.element.setAttribute("tabindex", val)
def _getSpellcheck(self):
"""
Specifies whether the element represents an element whose contents are subject to spell checking and grammar checking.
:returns: True | False
"""
return True if self.element.spellcheck == "true" else False
def _setSpellcheck(self, val):
"""
Specifies whether the element represents an element whose contents are subject to spell checking and grammar checking.
:param val: True | False
"""
self.element.spellcheck = str(val).lower()
def _getLang(self):
"""
Specifies the primary language for the contents of the element and for any of the elements attributes that contain text.
:returns: language tag e.g. de|en|fr|es|it|ru|
"""
return self.element.lang
def _setLang(self, val):
"""
Specifies the primary language for the contents of the element and for any of the elements attributes that contain text.
:param val: language tag
"""
self.element.lang = val
def _getHidden(self):
"""
Specifies that the element represents an element that is not yet, or is no longer, relevant.
:returns: True | False
"""
return True if self.element.hasAttribute("hidden") else False
def _setHidden(self, val):
"""
Specifies that the element represents an element that is not yet, or is no longer, relevant.
:param val: True | False
"""
if val:
self.element.setAttribute("hidden", "")
self.addClass("is-hidden")
else:
self.element.removeAttribute("hidden")
self.removeClass("is-hidden")
def _getDisabled(self):
return bool(self._disabledState)
def _setDisabled(self, disable):
for child in self._children:
child._setDisabled(disable)
if disable:
self._disabledState += 1
if isinstance(self, _attrDisabled) and self._disabledState == 1:
self.element.disabled = True
elif self._disabledState > 0:
if isinstance(self, _attrDisabled) and self._disabledState == 1:
self.element.disabled = False
self._disabledState -= 1
def _getDropzone(self):
"""
Specifies what types of content can be dropped on the element, and instructs the UA about which actions to take with content when it is dropped on the element.
:returns: "copy" | "move" | "link"
"""
return self.element.dropzone
def _setDropzone(self, val):
"""
Specifies what types of content can be dropped on the element, and instructs the UA about which actions to take with content when it is dropped on the element.
:param val: "copy" | "move" | "link"
"""
self.element.dropzone = val
def _getDraggable(self):
"""
Specifies whether the element is draggable.
:returns: True | False | "auto"
"""
return (self.element.draggable if str(self.element.draggable) == "auto" else (
True if str(self.element.draggable).lower() == "true" else False))
def _setDraggable(self, val):
"""
Specifies whether the element is draggable.
:param val: True | False | "auto"
"""
self.element.draggable = str(val).lower()
def _getDir(self):
"""
Specifies the elements text directionality.
:returns: ltr | rtl | auto
"""
return self.element.dir
def _setDir(self, val):
"""
Specifies the elements text directionality.
:param val: ltr | rtl | auto
"""
self.element.dir = val
def _getContextmenu(self):
"""
The value of the id attribute on the menu with which to associate the element as a context menu.
:returns:
"""
return self.element.contextmenu
def _setContextmenu(self, val):
"""
The value of the id attribute on the menu with which to associate the element as a context menu.
:param val:
"""
self.element.contextmenu = val
def _getContenteditable(self):
"""
Specifies whether the contents of the element are editable.
:returns: True | False
"""
v = self.element.getAttribute("contenteditable")
return str(v).lower() == "true"
def _setContenteditable(self, val):
"""
Specifies whether the contents of the element are editable.
:param val: True | False
"""
self.element.setAttribute("contenteditable", str(val).lower())
def _getAccesskey(self):
"""
A key label or list of key labels with which to associate the element; each key label represents a keyboard shortcut which UAs can use to activate the element or give focus to the element.
:param self:
:returns:
"""
return self.element.accesskey
def _setAccesskey(self, val):
"""
A key label or list of key labels with which to associate the element; each key label represents a keyboard shortcut which UAs can use to activate the element or give focus to the element.
:param self:
:param val:
"""
self.element.accesskey = val
def _getId(self):
"""
Specifies a unique id for an element
:param self:
:returns:
"""
return self.element.id
def _setId(self, val):
"""
Specifies a unique id for an element
:param self:
:param val:
"""
self.element.id = val
def _getClass(self):
"""
The class attribute specifies one or more classnames for an element.
:returns:
"""
if self._widgetClassWrapper is None:
self._widgetClassWrapper = _WidgetClassWrapper(self)
return self._widgetClassWrapper
def _setClass(self, value):
"""
The class attribute specifies one or more classnames for an element.
:param self:
:param value:
@raise ValueError:
"""
self._getClass().set(value)
def _getStyle(self):
"""
The style attribute specifies an inline style for an element.
:param self:
:returns:
"""
return _WidgetStyleWrapper(self)
def _getRole(self):
"""
Specifies a role for an element
@param self:
@return:
"""
return self.element.getAttribute("role")
def _setRole(self, val):
"""
Specifies a role for an element
@param self:
@param val:
"""
self.element.setAttribute("role", val)
def hide(self):
"""
Hide element, if shown.
:return:
"""
if not self["hidden"]:
self["hidden"] = True
def show(self):
"""
Show element, if hidden.
:return:
"""
if self["hidden"]:
self["hidden"] = False
def isHidden(self):
"""
Checks if a widget is hidden.
:return: True if hidden, False otherwise.
"""
return self["hidden"]
def isVisible(self):
"""
Checks if a widget is visible.
:return: True if visible, False otherwise.
"""
return not self.isHidden()
def onBind(self, widget, name):
"""
Event function that is called on the widget when it is bound to another widget with a name.
This is only done by the HTML parser, a manual binding by the user is not triggered.
"""
return
def onAttach(self):
self._isAttached = True
for c in self._children:
c.onAttach()
def onDetach(self):
self._isAttached = False
for c in self._children:
c.onDetach()
def __collectChildren(self, *args, **kwargs):
if kwargs.get("bindTo") is None:
kwargs["bindTo"] = self
widgets = []
for arg in args:
if isinstance(arg, (str, HtmlAst)):
widgets.extend(fromHTML(arg, **kwargs))
elif isinstance(arg, (list, tuple)):
for subarg in arg:
widgets.extend(self.__collectChildren(subarg, **kwargs))
elif not isinstance(arg, (Widget, TextNode)):
widgets.append(TextNode(str(arg)))
else:
widgets.append(arg)
return widgets
def insertBefore(self, insert, child, **kwargs):
if not child:
return self.appendChild(insert)
assert child in self._children, "{} is not a child of {}".format(child, self)
toInsert = self.__collectChildren(insert, **kwargs)
for insert in toInsert:
if insert._parent:
insert._parent.removeChild(insert)
self.element.insertBefore(insert.element, child.element)
self._children.insert(self._children.index(child), insert)
insert._parent = self
if self._isAttached:
insert.onAttach()
return toInsert
def prependChild(self, *args, **kwargs):
if kwargs.get("replace", False):
self.removeAllChildren()
del kwargs["replace"]
toPrepend = self.__collectChildren(*args, **kwargs)
for child in toPrepend:
if child._parent:
child._parent._children.remove(child)
child._parent = None
if not self._children:
self.appendChild(child)
else:
self.insertBefore(child, self.children(0))
return toPrepend
def appendChild(self, *args, **kwargs):
if kwargs.get("replace", False):
self.removeAllChildren()
del kwargs["replace"]
toAppend = self.__collectChildren(*args, **kwargs)
for child in toAppend:
if isinstance(child, Template):
return self.appendChild(child._children)
if child._parent:
child._parent._children.remove(child)
self._children.append(child)
self.element.appendChild(child.element)
child._parent = self
if self._isAttached:
child.onAttach()
return toAppend
def removeChild(self, child):
assert child in self._children, "{} is not a child of {}".format(child, self)
if child._isAttached:
child.onDetach()
self.element.removeChild(child.element)
self._children.remove(child)
child._parent = None
def removeAllChildren(self):
"""
Removes all child widgets of the current widget.
"""
for child in self._children[:]:
self.removeChild(child)
def isParentOf(self, widget):
"""
Checks if an object is the parent of widget.
:type widget: Widget
:param widget: The widget to check for.
:return: True, if widget is a child of the object, else False.
"""
# You cannot be your own child!
if self == widget:
return False
for child in self._children:
if child == widget:
return True
if child.isParentOf(widget):
return True
return False
def isChildOf(self, widget):
"""
Checks if an object is the child of widget.
:type widget: Widget
:param widget: The widget to check for.
:return: True, if object is a child of widget, else False.
"""
# You cannot be your own parent!
if self == widget:
return False
parent = self.parent()
while parent:
if parent == widget:
return True
parent = widget.parent()
return False
def hasClass(self, className):
"""
Determine whether the current widget is assigned the given class
:param className: The class name to search for.
:type className: str
"""
if isinstance(className, str) or isinstance(className, unicode):
return className in self["class"]
else:
raise TypeError()
def addClass(self, *args):
"""
Adds a class or a list of classes to the current widget.
If the widget already has the class, it is ignored.
:param args: A list of class names. This can also be a list.
:type args: list of str | list of list of str
"""
for item in args:
if isinstance(item, list):
self.addClass(*item)
elif isinstance(item, str):
for sitem in item.split(" "):
if not self.hasClass(sitem):
self["class"].append(sitem)
else:
raise TypeError()
def hasClass(self, name):
"""
Checks whether the widget has class name set or unset.
:param name: The class-name to be checked.
:type args: str
"""
return name in self["class"]
def removeClass(self, *args):
"""
Removes a class or a list of classes from the current widget.
:param args: A list of class names. This can also be a list.
:type args: list of str | list of list of str
"""
for item in args:
if isinstance(item, list):
self.removeClass(item)
elif isinstance(item, str):
for sitem in item.split(" "):
if self.hasClass(sitem):
self["class"].remove(sitem)
else:
raise TypeError()
def toggleClass(self, on, off=None):
"""
Toggles the class ``on``.
If the widget contains a class ``on``, it is toggled by ``off``.
``off`` can either be a class name that is substituted, or nothing.
:param on: Classname to test for. If ``on`` does not exist, but ``off``, ``off`` is replaced by ``on``.
:type on: str
:param off: Classname to replace if ``on`` existed.
:type off: str
:return: Returns True, if ``on`` was switched, else False.
:rtype: bool
"""
if self.hasClass(on):
self.removeClass(on)
if off and not self.hasClass(off):
self.addClass(off)
return False
if off and self.hasClass(off):
self.removeClass(off)
self.addClass(on)
return True
def onBlur(self, event):
pass
def onChange(self, event):
pass
def onContextMenu(self, event):
pass
def onFocus(self, event):
pass
def onFocusIn(self, event):
pass
def onFocusOut(self, event):
pass
def onFormChange(self, event):
pass
def onFormInput(self, event):
pass
def onInput(self, event):
pass
def onInvalid(self, event):
pass
def onReset(self, event):
pass
def onSelect(self, event):
pass
def onSubmit(self, event):
pass
def onKeyDown(self, event):
pass
def onKeyPress(self, event):
pass
def onKeyUp(self, event):
pass
def onClick(self, event):
pass
def onDblClick(self, event):
pass
def onDrag(self, event):
pass
def onDragEnd(self, event):
pass
def onDragEnter(self, event):
pass
def onDragLeave(self, event):
pass
def onDragOver(self, event):
pass
def onDragStart(self, event):
pass
def onDrop(self, event):
pass
def onMouseDown(self, event):
pass
def onMouseMove(self, event):
pass
def onMouseOut(self, event):
pass
def onMouseOver(self, event):
pass
def onMouseUp(self, event):
pass
def onMouseWheel(self, event):
pass
def onScroll(self, event):
pass
def onTouchStart(self, event):
pass