reportlab/platypus/frames.py
author andy_robinson
Wed, 17 Jul 2002 22:46:24 +0000
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#copyright ReportLab Inc. 2000
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#see license.txt for license details
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#history http://cvs.sourceforge.net/cgi-bin/cvsweb.cgi/reportlab/platypus/frames.py?cvsroot=reportlab
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#$Header: /tmp/reportlab/reportlab/platypus/frames.py,v 1.17 2002/07/17 22:46:23 andy_robinson Exp $
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__version__=''' $Id: frames.py,v 1.17 2002/07/17 22:46:23 andy_robinson Exp $ '''
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__doc__="""
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"""
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_geomAttr=('x1', 'y1', 'width', 'height', 'leftPadding', 'bottomPadding', 'rightPadding', 'topPadding')
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_FUZZ=1e-6 # to avoid numerical difficulties we use this as an error band
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from reportlab import rl_config
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class Frame:
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    '''
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    A Frame is a piece of space in a document that is filled by the
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    "flowables" in the story.  For example in a book like document most
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    pages have the text paragraphs in one or two frames.  For generality
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    a page might have several frames (for example for 3 column text or
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    for text that wraps around a graphic).
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    After creation a Frame is not usually manipulated directly by the
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    applications program -- it is used internally by the platypus modules.
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    Here is a diagramatid abstraction for the definitional part of a Frame
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                width                    x2,y2
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        +---------------------------------+
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        | l  top padding                r | h
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        | e +-------------------------+ i | e
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        | f |                         | g | i
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        | t |                         | h | g
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        |   |                         | t | h
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        | p |                         |   | t
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        | a |                         | p |
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        | d |                         | a |
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        |   |                         | d |
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        |   +-------------------------+   |
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        |    bottom padding               |
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        +---------------------------------+
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        (x1,y1) <-- lower left corner
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        NOTE!! Frames are stateful objects.  No single frame should be used in
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        two documents at the same time (especially in the presence of multithreading.
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    '''
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    def __init__(self, x1, y1, width,height, leftPadding=6, bottomPadding=6,
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            rightPadding=6, topPadding=6, id=None, showBoundary=0):
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        self.id = id
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        #these say where it goes on the page
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        self.__dict__['_x1'] = x1
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        self.__dict__['_y1'] = y1
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        self.__dict__['_width'] = width
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        self.__dict__['_height'] = height
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        #these create some padding.
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        self.__dict__['_leftPadding'] = leftPadding
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        self.__dict__['_bottomPadding'] = bottomPadding
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        self.__dict__['_rightPadding'] = rightPadding
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        self.__dict__['_topPadding'] = topPadding
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        # if we want a boundary to be shown
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        self.showBoundary = showBoundary
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        self._geom()
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        self._reset()
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    def __getattr__(self,a):
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        if a in _geomAttr: return self.__dict__['_'+a]
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        raise AttributeError, a
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    def __setattr__(self,a,v):
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        if a in _geomAttr:
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            self.__dict__['_'+a] = v
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            self._geom()
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        else:
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            self.__dict__[a] = v
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    def _geom(self):
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        self._x2 = self._x1 + self._width
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        self._y2 = self._y1 + self._height
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        #efficiency
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        self._y1p = self._y1 + self._bottomPadding
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        #work out the available space
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        self._aW = self._x2 - self._x1 - self._leftPadding - self._rightPadding
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        self._aH = self._y2 - self._y1p - self._topPadding
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    def _reset(self):
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        #drawing starts at top left
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        self._x = self._x1 + self._leftPadding
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        self._y = self._y2 - self._topPadding
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        self._atTop = 1
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    def _add(self, flowable, canv, trySplit=0):
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        """ Draws the flowable at the current position.
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        Returns 1 if successful, 0 if it would not fit.
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        Raises a LayoutError if the object is too wide,
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        or if it is too high for a totally empty frame,
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        to avoid infinite loops"""
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        y = self._y
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        p = self._y1p
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        s = 0
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        if not self._atTop: s = flowable.getSpaceBefore()
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        h = y - p - s
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        if h>0:
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            flowable.canv = canv #so they can use stringWidth etc
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            w, h = flowable.wrap(self._aW, h)
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            del flowable.canv
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        else:
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            return 0
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        h = h + s
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        y = y - h
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        if y < p-_FUZZ:
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            # width test disabled!  Just allow it to overflow and let the user
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            # fix the problem (XXXX MAYBE CHANGE THIS TO OPTIONAL WARNING/ERROR)
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            #if ((h > self._aH and not trySplit) or w > self._aW):
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            if (not rl_config.allowTableBoundsErrors) and (h > self._aH and not trySplit):
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                raise "LayoutError", "Flowable %s (%sx%s points) too large for frame (%sx%s points)." % (
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                    flowable.__class__, w,h, self._aW,self._aH)
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            return 0
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        else:
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            #now we can draw it, and update the current point.
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            flowable.drawOn(canv, self._x, y, _sW=self._aW-w)
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            y = y - flowable.getSpaceAfter()
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            if y<>self._y: self._atTop = 0
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            self._y = y
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            return 1
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    add = _add
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    def split(self,flowable,canv):
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        '''Ask the flowable to split using up the available space.'''
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        y = self._y
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        p = self._y1p
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        s = 0
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        if not self._atTop: s = flowable.getSpaceBefore()
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        flowable.canv = canv    #some flowables might need this
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        r = flowable.split(self._aW, y-p-s)
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        del flowable.canv
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        return r
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    def drawBoundary(self,canv):
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        "draw the frame boundary as a rectangle (primarily for debugging)."
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        from reportlab.lib.colors import Color, CMYKColor, toColor
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        sb = self.showBoundary
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        isColor = type(sb) in (type(''),type(()),type([])) or isinstance(sb,Color)
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        if isColor:
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            sb = toColor(sb,self)
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            if sb is self: isColor = 0
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            else:
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                canv.saveState()
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                canv.setStrokeColor(sb)
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        canv.rect(
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                self._x1,
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                self._y1,
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                self._x2 - self._x1,
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                self._y2 - self._y1
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                )
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        if isColor: canv.restoreState()
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    def addFromList(self, drawlist, canv):
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        """Consumes objects from the front of the list until the
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        frame is full.  If it cannot fit one object, raises
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        an exception."""
253
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        if self.showBoundary:
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            self.drawBoundary(canv)
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        while len(drawlist) > 0:
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            head = drawlist[0]
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            if self.add(head,canv,trySplit=0):
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                del drawlist[0]
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            else:
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                #leave it in the list for later
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                break