文件操作 - label_inference.py

文件: /usr/lib64/python2.7/site-packages/orca/label_inference.py

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# Orca
#
# Copyright (C) 2011 Igalia, S.L.
#
# Author: Joanmarie Diggs <jdiggs@igalia.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the
# Free Software Foundation, Inc., Franklin Street, Fifth Floor,
# Boston MA  02110-1301 USA.

"""Heuristic means to infer the functional/displayed label of a widget."""

__id__        = "$Id$"
__version__   = "$Revision$"
__date__      = "$Date$"
__copyright__ = "Copyright (C) 2011 Igalia, S.L."
__license__   = "LGPL"

import pyatspi

from . import debug

class LabelInference:

def __init__(self, script):
        """Creates an instance of the LabelInference class.

Arguments:
        - script: the script with which this instance is associated.
        """

self._script = script
        self._lineCache = {}
        self._extentsCache = {}
        self._isWidgetCache = {}

def infer(self, obj, focusedOnly=True):
        """Attempt to infer the functional/displayed label of obj.

Arguments
        - obj: the unlabeled widget
        - focusedOnly: If True, only infer if the widget has focus.

Returns the text which we think is the label, or None.
        """

debug.println(debug.LEVEL_FINE, "INFER label for: %s" % obj)
        if not obj:
            return None

if focusedOnly and not obj.getState().contains(pyatspi.STATE_FOCUSED):
            debug.println(debug.LEVEL_FINE, "INFER - object not focused")
            return None

result = None
        if not result:
            result = self.inferFromTextLeft(obj)
            debug.println(debug.LEVEL_FINE, "INFER - Text Left: %s" % result)
        if not result or self._preferRight(obj):
            result = self.inferFromTextRight(obj)
            debug.println(debug.LEVEL_FINE, "INFER - Text Right: %s" % result)
        if not result:
            result = self.inferFromTable(obj)
            debug.println(debug.LEVEL_FINE, "INFER - Table: %s" % result)
        if not result:
            result = self.inferFromTextAbove(obj)
            debug.println(debug.LEVEL_FINE, "INFER - Text Above: %s" % result)
        if not result:
            result = self.inferFromTextBelow(obj)
            debug.println(debug.LEVEL_FINE, "INFER - Text Below: %s" % result)

# TODO - We probably do not wish to "infer" from these. Instead, we
        # should ensure that this content gets presented as part of the widget.
        # (i.e. the label is something on screen. Widget name and description
        # are each something other than a label.)
        if not result:
            result = obj.name
            debug.println(debug.LEVEL_FINE, "INFER - Name: %s" % result)
        if not result:
            result = obj.description
            debug.println(debug.LEVEL_FINE, "INFER - Description: %s" % result)
        if result:
            result = result.strip()

self.clearCache()
        return result

def clearCache(self):
        """Dumps whatever we've stored for performance purposes."""

self._lineCache = {}
        self._extentsCache = {}
        self._isWidgetCache = {}

def _preferRight(self, obj):
        """Returns True if we should prefer text on the right, rather than the
        left, for the object obj."""

onRightRoles = [pyatspi.ROLE_CHECK_BOX, pyatspi.ROLE_RADIO_BUTTON]
        return obj.getRole() in onRightRoles

def _preferTop(self, obj):
        """Returns True if we should prefer text above, rather than below for
        the object obj."""

roles = [pyatspi.ROLE_COMBO_BOX, pyatspi.ROLE_LIST]

# Put new-to-pyatspi roles here.
        try:
            roles.append(pyatspi.ROLE_LIST_BOX)
        except:
            pass

return obj.getRole() in roles

def _isSimpleObject(self, obj):
        """Returns True if the given object has 'simple' contents, such as text
        without embedded objects or a single embedded object without text."""

if not obj:
            return False

try:
            children = [child for child in obj]
        except (LookupError, RuntimeError):
            debug.println(debug.LEVEL_FINE, 'Dead Accessible in %s' % obj)
            return False

children = [x for x in children if x.getRole() != pyatspi.ROLE_LINK]
        if len(children) > 1:
            return False

try:
            text = obj.queryText()
        except NotImplementedError:
            return True

string = text.getText(0, -1).decode('UTF-8').strip()
        if string.find(self._script.EMBEDDED_OBJECT_CHARACTER) > -1:
            return len(string) == 1

return True

def _isWidget(self, obj):
        """Returns True if the given object is a widget."""

if not obj:
            return False

rv = self._isWidgetCache.get(hash(obj))
        if rv != None:
            return rv

widgetRoles = [pyatspi.ROLE_CHECK_BOX,
                       pyatspi.ROLE_RADIO_BUTTON,
                       pyatspi.ROLE_TOGGLE_BUTTON,
                       pyatspi.ROLE_COMBO_BOX,
                       pyatspi.ROLE_LIST,
                       pyatspi.ROLE_MENU,
                       pyatspi.ROLE_MENU_ITEM,
                       pyatspi.ROLE_ENTRY,
                       pyatspi.ROLE_PASSWORD_TEXT,
                       pyatspi.ROLE_PUSH_BUTTON]

# Put new-to-pyatspi roles here.
        try:
            widgetRoles.append(pyatspi.ROLE_LIST_BOX)
        except:
            pass

isWidget = obj.getRole() in widgetRoles
        self._isWidgetCache[hash(obj)] = isWidget
        return isWidget

def _getExtents(self, obj, startOffset=0, endOffset=-1):
        """Returns (x, y, width, height) of the text at the given offsets
        if the object implements accessible text, or just the extents of
        the object if it doesn't implement accessible text."""

if not obj:
            return 0, 0, 0, 0

rv = self._extentsCache.get((hash(obj), startOffset, endOffset))
        if rv:
            return rv

extents = 0, 0, 0, 0
        try:
            text = obj.queryText()
        except NotImplementedError:
            pass
        else:
            skipTextExtents = [pyatspi.ROLE_ENTRY, pyatspi.ROLE_PASSWORD_TEXT]
            if not obj.getRole() in skipTextExtents:
                extents = text.getRangeExtents(startOffset, endOffset, 0)

if not (extents[2] and extents[3]):
            ext = obj.queryComponent().getExtents(0)
            extents = ext.x, ext.y, ext.width, ext.height

self._extentsCache[(hash(obj), startOffset, endOffset)] = extents
        return extents

def _createLabelFromContents(self, obj):
        """Gets the functional label text associated with the object obj."""

if not self._isSimpleObject(obj):
            return ''

if self._isWidget(obj):
            return ''

contents = self._script.utilities.getObjectsFromEOCs(obj)
        objects = [content[0] for content in contents]
        if list(filter(self._isWidget, objects)):
            return ''

strings = [content[3] or content[0].name for content in contents]
        strings = [x.strip() for x in strings]
        return ' '.join(strings)

def _getLineContents(self, obj):
        """Get the (obj, startOffset, endOffset, string) tuples for the line
        containing the object, obj."""

rv = self._lineCache.get(hash(obj))
        if rv:
            return rv

key = hash(obj)
        start = None
        if self._isWidget(obj):
            start, end = self._script.utilities.getHyperlinkRange(obj)
            obj = obj.parent

boundary = pyatspi.TEXT_BOUNDARY_LINE_START
        rv = self._script.utilities.getObjectsFromEOCs(obj, boundary, start)
        self._lineCache[key] = rv

return rv

def _getPreviousObject(self, obj):
        """Gets the object prior to obj."""

index = obj.getIndexInParent()
        if not index > 0:
            return obj.parent

prevObj = obj.parent[index-1]
        if prevObj and prevObj.childCount:
            prevObj = prevObj[prevObj.childCount - 1]

return prevObj

def inferFromTextLeft(self, obj, proximity=75):
        """Attempt to infer the functional/displayed label of obj by
        looking at the contents of the current line, which are to the
        left of this object

Arguments
        - obj: the unlabeled widget
        - proximity: pixels expected for a match

Returns the text which we think is the label, or None.
        """

extents = self._getExtents(obj)
        contents = self._getLineContents(obj)
        content = [o for o in contents if o[0] == obj]
        try:
            index = contents.index(content[0])
        except IndexError:
            index = len(contents)

onLeft = contents[max(0, index-1):index]
        onLeft = [o for o in onLeft if o[0] and not self._isWidget(o[0])]
        if not onLeft:
            return None

lObj, start, end, string = onLeft[-1]
        string = (string or lObj.name).strip()
        if not string:
            return None

lExtents = self._getExtents(lObj, start, end)
        distance = extents[0] - (lExtents[0] + lExtents[2])
        if distance <= proximity:
            return string

return None

def inferFromTextRight(self, obj, proximity=25):
        """Attempt to infer the functional/displayed label of obj by
        looking at the contents of the current line, which are to the
        right of this object

Arguments
        - obj: the unlabeled widget
        - proximity: pixels expected for a match

Returns the text which we think is the label, or None.
        """

onRight = contents[min(len(contents), index+1):]
        onRight = [o for o in onRight if o[0] and not self._isWidget(o[0])]
        if not onRight:
            return None

rObj, start, end, string = onRight[0]
        string = (string or rObj.name).strip()
        if not string:
            return None

rExtents = self._getExtents(rObj, start, end)
        distance = rExtents[0] - (extents[0] + extents[2])
        if distance <= proximity or self._preferRight(obj):
            return string

return None

def inferFromTextAbove(self, obj, proximity=20):
        """Attempt to infer the functional/displayed label of obj by
        looking at the contents of the line above the line containing
        the object obj.

Arguments
        - obj: the unlabeled widget
        - proximity: pixels expected for a match

Returns the text which we think is the label, or None.
        """

thisLine = self._getLineContents(obj)
        prevObj, start, end, string = thisLine[0]
        if obj == prevObj:
            start, end = self._script.utilities.getHyperlinkRange(prevObj)
            prevObj = prevObj.parent

try:
            text = prevObj.queryText()
        except (AttributeError, NotImplementedError):
            return None

objX, objY, objWidth, objHeight = self._getExtents(obj)
        if not (objWidth and objHeight):
            return None

boundary = pyatspi.TEXT_BOUNDARY_LINE_START
        line = text.getTextBeforeOffset(start, boundary)
        string = line[0].strip()
        if string:
            x, y, width, height = self._getExtents(prevObj, start, end)
            distance = objY - (y + height)
            if distance <= proximity:
                return string

while prevObj:
            prevObj = self._getPreviousObject(prevObj)
            x, y, width, height = self._getExtents(prevObj)
            distance = objY - (y + height)
            if distance > proximity:
                return None
            if distance < 1:
                continue
            if x + 150 < objX:
                continue
            string = self._createLabelFromContents(prevObj)
            if string:
                return string

return None

def inferFromTextBelow(self, obj, proximity=20):
        """Attempt to infer the functional/displayed label of obj by
        looking at the contents of the line above the line containing
        the object obj.

Arguments
        - obj: the unlabeled widget
        - proximity: pixels expected for a match

Returns the text which we think is the label, or None.
        """

thisLine = self._getLineContents(obj)
        nextObj, start, end, string = thisLine[-1]
        if obj == nextObj:
            start, end = self._script.utilities.getHyperlinkRange(nextObj)
            nextObj = nextObj.parent

try:
            text = nextObj.queryText()
        except (AttributeError, NotImplementedError):
            return None

objX, objY, objWidth, objHeight = self._getExtents(obj)
        if not (objWidth and objHeight):
            return None

boundary = pyatspi.TEXT_BOUNDARY_LINE_START
        line = text.getTextAfterOffset(end - 1, boundary)
        string = line[0].strip()
        if string:
            x, y, width, height = self._getExtents(nextObj, start, end)
            distance = y - (objY + objHeight)
            if distance <= proximity:
                return string

return None

def inferFromTable(self, obj):
        """Attempt to infer the functional/displayed label of obj by looking
        at the contents of the surrounding table cells. Note that this approach
        assumes a simple table in which the widget is the sole occupant of its
        cell.

Arguments
        - obj: the unlabeled widget

Returns the text which we think is the label, or None.
        """

pred = lambda x: x.getRole() == pyatspi.ROLE_TABLE_CELL
        cell = pyatspi.utils.findAncestor(obj, pred)
        if not self._isSimpleObject(cell):
            return None

pred = lambda x: x.getRole() == pyatspi.ROLE_TABLE
        grid = pyatspi.utils.findAncestor(cell, pred)
        if not grid:
            return None

try:
            table = grid.queryTable()
        except NotImplementedError:
            return None

index = self._script.utilities.cellIndex(cell)
        row = table.getRowAtIndex(index)
        col = table.getColumnAtIndex(index)

if col > 0 and not self._preferRight(obj):
            candidate = table.getAccessibleAt(row, col - 1)
            label = self._createLabelFromContents(candidate)
            if label:
                return label

if col < table.nColumns:
            candidate = table.getAccessibleAt(row, col + 1)
            label = self._createLabelFromContents(candidate)
            if label:
                return label

if row > 0:
            candidate = table.getAccessibleAt(row - 1, col)
            label = self._createLabelFromContents(candidate)
            if label:
                return label

if row < table.nRows and not self._preferTop(obj):
            candidate = table.getAccessibleAt(row + 1, col)
            label = self._createLabelFromContents(candidate)
            if label:
                return label

# None of the cells immediately surrounding this cell seem to be serving
        # as a functional label. Therefore, see if this table looks like a grid
        # of widgets with the functional labels in the first row.
        firstRow = [table.getAccessibleAt(0, i) for i in range(table.nColumns)]
        if not firstRow or list(filter(self._isWidget, firstRow)):
            return None

cells = [table.getAccessibleAt(i, col) for i in range(1, table.nRows)]
        if [x for x in cells if x == None]:
            debug.println(debug.LEVEL_FINE, "INFER: Potentially broken table!")
            return None
        if [x for x in cells if x[0] and x[0].getRole() != obj.getRole()]:
            return None

label = self._createLabelFromContents(firstRow[col])
        if label:
            return label

return None

文件操作 - label_inference.py

文件: /usr/lib64/python2.7/site-packages/orca/label_inference.py

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