223 lines
9.5 KiB
Python
223 lines
9.5 KiB
Python
'''This module contains classes used for layouting graphical elements
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(fields, widgets, groups, ...).'''
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# A layout defines how a given field is rendered in a given context. Several
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# contexts exist:
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# "view" represents a given page for a given Appy class, in read-only mode.
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# "edit" represents a given page for a given Appy class, in edit mode.
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# "cell" represents a cell in a table, like when we need to render a field
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# value in a query result or in a reference table.
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# Layout elements for a class or page ------------------------------------------
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# s - The page summary, containing summarized information about the page or
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# class, workflow information and object history.
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# w - The widgets of the current page/class
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# n - The navigation panel (inter-objects navigation)
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# b - The range of buttons (intra-object navigation, save, edit, delete...)
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# Layout elements for a field --------------------------------------------------
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# l - "label" The field label
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# d - "description" The field description (a description is always visible)
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# h - "help" Help for the field (typically rendered as an icon,
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# clicking on it shows a popup with online help
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# v - "validation" The icon that is shown when a validation error occurs
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# (typically only used on "edit" layouts)
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# r - "required" The icon that specified that the field is required (if
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# relevant; typically only used on "edit" layouts)
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# f - "field" The field value, or input for entering a value.
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# For every field of a Appy class, you can define, for every layout context,
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# what field-related information will appear, and how it will be rendered.
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# Variables defaultPageLayouts and defaultFieldLayouts defined below give the
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# default layouts for pages and fields respectively.
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#
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# How to express a layout? You simply define a string that is made of the
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# letters corresponding to the field elements you want to render. The order of
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# elements correspond to the order into which they will be rendered.
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# ------------------------------------------------------------------------------
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rowDelimiters = {'-':'middle', '=':'top', '_':'bottom'}
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rowDelms = ''.join(rowDelimiters.keys())
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cellDelimiters = {'|': 'center', ';': 'left', '!': 'right'}
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cellDelms = ''.join(cellDelimiters.keys())
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macroDict = {
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# Page-related elements
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's': ('page', 'header'), 'w': ('page', 'widgets'),
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'n': ('navigate', 'objectNavigate'), 'b': ('page', 'buttons'),
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# Field-related elements
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'l': ('show', 'label'), 'd': ('show', 'description'),
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'h': ('show', 'help'), 'v': ('show', 'validation'),
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'r': ('show', 'required')
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}
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# ------------------------------------------------------------------------------
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class LayoutElement:
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'''Abstract base class for any layout element.'''
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def get(self): return self.__dict__
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class Cell(LayoutElement):
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'''Represents a cell in a row in a table.'''
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def __init__(self, content, align, isHeader=False):
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self.align = align
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self.width = None
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self.content = None
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self.colspan = 1
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if isHeader:
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self.width = content
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else:
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self.content = [] # The list of widgets to render in the cell
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self.decodeContent(content)
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def decodeContent(self, content):
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digits = '' # We collect the digits that will give the colspan
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for char in content:
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if char.isdigit():
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digits += char
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else:
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# It is a letter corresponding to a macro
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if char in macroDict:
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self.content.append(macroDict[char])
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elif char == 'f':
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# The exact macro to call will be known at render-time
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self.content.append('?')
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# Manage the colspan
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if digits:
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self.colspan = int(digits)
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# ------------------------------------------------------------------------------
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class Row(LayoutElement):
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'''Represents a row in a table.'''
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def __init__(self, content, valign, isHeader=False):
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self.valign = valign
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self.cells = []
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self.decodeCells(content, isHeader)
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# Compute the row length
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length = 0
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for cell in self.cells:
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length += cell['colspan']
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self.length = length
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def decodeCells(self, content, isHeader):
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'''Decodes the given chunk of layout string p_content containing
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column-related information (if p_isHeader is True) or cell content
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(if p_isHeader is False) and produces a list of Cell instances.'''
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cellContent = ''
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for char in content:
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if char in cellDelimiters:
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align = cellDelimiters[char]
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self.cells.append(Cell(cellContent, align, isHeader).get())
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cellContent = ''
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else:
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cellContent += char
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# Manage the last cell if any
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if cellContent:
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self.cells.append(Cell(cellContent, 'left', isHeader).get())
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# ------------------------------------------------------------------------------
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class Table(LayoutElement):
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'''Represents a table where to dispose graphical elements.'''
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simpleParams = ('style', 'css_class', 'cellpadding', 'cellspacing', 'width',
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'align')
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derivedRepls = {'view': 'hrvd', 'cell': 'ld'}
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def __init__(self, layoutString=None, style=None, css_class='',
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cellpadding=0, cellspacing=0, width='100%', align='left',
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other=None, derivedType=None):
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if other:
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# We need to create a Table instance from another Table instance,
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# given in p_other. In this case, we ignore previous params.
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if derivedType != None:
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# We will not simply clone p_other. If p_derivedType is:
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# - "view", p_derivedFrom is an "edit" layout, and we must
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# create the corresponding "view" layout;
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# - "cell", p_derivedFrom is a "view" layout, and we must
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# create the corresponding "cell" layout;
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self.layoutString = Table.deriveLayout(other.layoutString,
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derivedType)
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else:
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self.layoutString = other.layoutString
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source = 'other.'
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else:
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source = ''
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self.layoutString = layoutString
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# Initialise simple params, either from the true params, either from
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# the p_other Table instance.
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for param in Table.simpleParams:
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exec 'self.%s = %s%s' % (param, source, param)
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# The following attribute will store a special Row instance used for
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# defining column properties.
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self.headerRow = None
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# The content rows will be stored hereafter.
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self.rows = []
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self.decodeRows(self.layoutString)
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@staticmethod
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def deriveLayout(layout, derivedType):
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'''Returns a layout derived from p_layout.'''
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res = layout
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for letter in Table.derivedRepls[derivedType]:
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res = res.replace(letter, '')
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# Strip the derived layout
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res = res.lstrip(rowDelms); res = res.lstrip(cellDelms)
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if derivedType == 'cell':
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res = res.rstrip(rowDelms); res = res.rstrip(cellDelms)
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return res
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def addCssClasses(self, css_class):
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'''Adds a single or a group of p_css_class.'''
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classes = self.css_class
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if classes == None:
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classes = ''
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if not classes:
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self.css_class = css_class
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else:
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self.css_class += ' ' + css_classes
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# Ensures that every class appears once
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self.css_class = ' '.join(set(self.css_class.split()))
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def isHeaderRow(self, rowContent):
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'''Determines if p_rowContent specified the table header row or a
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content row.'''
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# Find the first char that is a number or a letter
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for char in rowContent:
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if char not in cellDelimiters:
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if char.isdigit(): return True
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else: return False
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return True
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def decodeRows(self, layoutString):
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'''Decodes the given p_layoutString and produces a list of Row
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instances.'''
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# Split the p_layoutString with the row delimiters
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rowContent = ''
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for char in layoutString:
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if char in rowDelimiters:
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valign = rowDelimiters[char]
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if self.isHeaderRow(rowContent):
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if not self.headerRow:
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self.headerRow = Row(rowContent, valign,
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isHeader=True).get()
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else:
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self.rows.append(Row(rowContent, valign).get())
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rowContent = ''
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else:
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rowContent += char
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# Manage the last row if any
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if rowContent:
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self.rows.append(Row(rowContent, 'middle').get())
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def removeElement(self, elem):
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'''Removes given p_elem from myself.'''
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macroToRemove = macroDict[elem]
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for row in self.rows:
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for cell in row['cells']:
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if macroToRemove in cell['content']:
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cell['content'].remove(macroToRemove)
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# ------------------------------------------------------------------------------
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defaultPageLayouts = {
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'view': Table('n!-w|-b|', align="center"),
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'edit': Table('w|-b|', width=None)}
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defaultFieldLayouts = {'edit': 'lrv-f'}
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# ------------------------------------------------------------------------------
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