示例#1
0
 def __positionPair(self, pos):
     cursor = QTextCursor(self.document())
     cursor.setPosition(pos)
     rootFrame = self.document().rootFrame()
     frames = rootFrame.childFrames()
     frame = cursor.currentFrame()
     if frame == rootFrame:
         # pos is outside any group
         return [pos, pos]
     p = frame.parentFrame()
     if p != rootFrame:
         # frame is an input or output frame containing pos
         return [frame.firstPosition(), frame.lastPosition()]
     # frame is a group frame containing pos in a comment position
     localFrames = frame.childFrames()
     inputStart = localFrames[0].firstPosition()
     if pos < inputStart:
         return [frame.firstPosition(), inputStart - 1]
     inputEnd = localFrames[0].lastPosition()
     outputStart = localFrames[1].firstPosition()
     if inputEnd < pos and pos < outputStart:
         return [inputEnd + 1, outputStart - 1]
     outputEnd = localFrames[1].lastPosition()
     if outputEnd < pos:
         return [outputEnd + 1, frame.lastPosition()]
     traceLogger.critical("bad position %d (%d %d) (%d %d)" %
                          (pos, ifr.firstPosition(), ifr.lastPosition(),
                           ofr.firstPosition(), ofr.lastPosition()))
     return [-1, -1]
示例#2
0
文件: qrview.py 项目: webushka/reduce
 def __positionPair(self,pos):
     cursor = QTextCursor(self.document())
     cursor.setPosition(pos)
     rootFrame = self.document().rootFrame()
     frames = rootFrame.childFrames()
     frame = cursor.currentFrame()
     if frame == rootFrame:
         # pos is outside any group
         return [pos,pos]
     p = frame.parentFrame()
     if p != rootFrame:
         # frame is an input or output frame containing pos
         return [frame.firstPosition(),frame.lastPosition()]
     # frame is a group frame containing pos in a comment position
     localFrames = frame.childFrames()
     inputStart = localFrames[0].firstPosition()
     if pos < inputStart:
         return [frame.firstPosition(),inputStart-1]
     inputEnd = localFrames[0].lastPosition()
     outputStart = localFrames[1].firstPosition()
     if inputEnd < pos and pos < outputStart:
         return [inputEnd+1,outputStart-1]
     outputEnd = localFrames[1].lastPosition()
     if outputEnd < pos:
         return [outputEnd+1,frame.lastPosition()]
     traceLogger.critical("bad position %d (%d %d) (%d %d)" %
                          (pos,
                           ifr.firstPosition(), ifr.lastPosition(),
                           ofr.firstPosition(), ofr.lastPosition()))
     return [-1,-1]
示例#3
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 def markSentence(self):
     """Mark sentence with marker if marker ir checked."""
     cursor = QTextCursor(self.sentence_mw.ui.textEditSentence.document())
     begin = self.sentence_mw.ui.textEditSentence.textCursor(
     ).selectionStart()
     end = self.sentence_mw.ui.textEditSentence.textCursor().selectionEnd()
     marker = self.preferences['marker']
     cursor.setPosition(begin, QTextCursor.MoveAnchor)
     cursor.insertText(marker[0])
     cursor.setPosition(end + 1, QTextCursor.MoveAnchor)
     cursor.insertText(marker[1])
示例#4
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文件: qrview.py 项目: webushka/reduce
 def gotoRow(self,row):
     rows = self.document().rootFrame().childFrames()
     if row >= len(rows):
         traceLogger.critical("invalid row %d > %d" % (row,len(rows)-1))
         row = len(rows)
     cursor = QTextCursor(rows[row].lastCursorPosition())
     cursor.movePosition(QTextCursor.NextBlock)
     self.setTextCursor(cursor)
     self.ensureCursorVisible()
     cursor = QTextCursor(rows[row].childFrames()[0])
     self.setTextCursor(cursor)
     self.ensureCursorVisible()
示例#5
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文件: qrview.py 项目: webushka/reduce
 def currentField(self,row):
     rows = self.document().rootFrame().childFrames()
     if row >= len(rows):
         traceLogger.critical("invalid row %d > %d" % (row,len(rows)-1))
         row = len(rows)
     inputFrame = rows[row].childFrames()[0]
     cursor = QTextCursor(inputFrame)
     cursor.setPosition(inputFrame.lastPosition(),QTextCursor.KeepAnchor)
     command = cursor.selectedText()
     command = command.replace(u'\u2028',u'\n')
     command = command.replace(u'\u2029',u'\n')
     if command != '' and not command[-1] in [';','$']:
         command += ';'
     return command
示例#6
0
 def currentField(self, row):
     rows = self.document().rootFrame().childFrames()
     if row >= len(rows):
         traceLogger.critical("invalid row %d > %d" % (row, len(rows) - 1))
         row = len(rows)
     inputFrame = rows[row].childFrames()[0]
     cursor = QTextCursor(inputFrame)
     cursor.setPosition(inputFrame.lastPosition(), QTextCursor.KeepAnchor)
     command = cursor.selectedText()
     command = command.replace(u'\u2028', u'\n')
     command = command.replace(u'\u2029', u'\n')
     if command != '' and not command[-1] in [';', '$']:
         command += ';'
     return command
示例#7
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    def hideFrom(self, line):
        """ Hides a block starting by line. Do nothing if not hidable"""
        block = self.getWidget().document().findBlockByNumber(line - 1)

        openB = block.text().count("(")
        closeB = block.text().count(")")
        startline = line
        # go to line >= line: block starts counting by 0
        block = self.getWidget().document().findBlockByNumber(line - 1)
        hidden = []
        assert block.isValid()
        while openB > closeB and block.isValid():
            assert block.isValid()
            block = block.next()
            line = block.blockNumber() + 1
            if block.isVisible():
                hidden.append(line)
            openB += block.text().count("(")
            closeB += block.text().count(")")

        if hidden == []:
            return
        self._hideLines(hidden)
        self.hidden[startline] = hidden

        # set current line in viewable area
        current_line = self.getWidget().document().findBlock(
            self.getWidget().textCursor().position()).blockNumber() + 1
        if (startline < current_line and current_line <= line):
            block = block.next()
            cursor = QTextCursor(block)
            self.getWidget().setTextCursor(cursor)
示例#8
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 def cursor_is_in_editing_region(self, cursor):
     # Want to be to the right of the prompt...
     if cursor.positionInBlock() < len(self.prompt):
         return False
     # ... and in the final line.
     if cursor.blockNumber() != self.te.blockCount() - 1:
         return False
     if cursor.anchor() != cursor.position():
         # Anchor might be outside of editing region
         anchorCursor = QTextCursor(cursor)
         anchorCursor.setPosition(cursor.anchor())
         if anchorCursor.positionInBlock() < len(self.prompt):
             return False
         if anchorCursor.blockNumber() != self.te.blockCount() - 1:
             return False
     return True
示例#9
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文件: lines.py 项目: Darriall/editor
 def append(self, text):
     """Append line to the end
     """
     cursor = QTextCursor(self._doc)
     cursor.movePosition(QTextCursor.End)
     cursor.insertBlock()
     cursor.insertText(text)
示例#10
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    def cursors(self):
        """Cursors for rectangular selection.
        1 cursor for every line
        """
        cursors = []
        if self._start is not None:
            startLine, startVisibleCol = self._start
            currentLine, currentCol = self._qpart.cursorPosition
            if abs(startLine - currentLine) > self._MAX_SIZE or \
               abs(startVisibleCol - currentCol) > self._MAX_SIZE:
                # Too big rectangular selection freezes the GUI
                self._qpart.userWarning.emit('Rectangular selection area is too big')
                self._start = None
                return []
            
            currentBlockText = self._qpart.textCursor().block().text()
            currentVisibleCol = self._realToVisibleColumn(currentBlockText, currentCol)

            for lineNumber in range(min(startLine, currentLine),
                                    max(startLine, currentLine) + 1):
                block = self._qpart.document().findBlockByNumber(lineNumber)
                cursor = QTextCursor(block)
                realStartCol = self._visibleToRealColumn(block.text(), startVisibleCol)
                realCurrentCol = self._visibleToRealColumn(block.text(), currentVisibleCol)
                if realStartCol is None:
                    realStartCol = block.length()  # out of range value
                if realCurrentCol is None:
                    realCurrentCol = block.length()  # out of range value
                cursor.setPositionInBlock(min(realStartCol, block.length() - 1))
                cursor.setPositionInBlock(min(realCurrentCol, block.length() - 1), QTextCursor.KeepAnchor)
                
                cursors.append(cursor)

        return cursors
示例#11
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    def __init__(self, cursorOrBlockOrDoc, startPos=None, endPos=None,
                 draw_order=0, tooltip=None):
        """
        Creates a text decoration

        :param cursorOrBlockOrDoc: Selection
        :type cursorOrBlockOrDoc: QTextCursor or QTextBlock or QTextDocument

        :param startPos: Selection start pos

        :param endPos: Selection end pos

        .. note:: Use the cursor selection if startPos and endPos are none.
        """
        self.draw_order = draw_order
        self.tooltip = tooltip
        QTextEdit.ExtraSelection.__init__(self)
        cursor = QTextCursor(cursorOrBlockOrDoc)
        if startPos is not None:
            cursor.setPosition(startPos)
        if endPos is not None:
            cursor.setPosition(endPos, QTextCursor.KeepAnchor)
        self.cursor = cursor
示例#12
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    def update_editor(self, *args, **kw):
        '''
        '''
        self.control.clear()
        adapter = self.factory.adapter
        tables = adapter.make_tables(self.value)
        cursor = QTextCursor(self.control.textCursor())
        n = len(tables)

        for i, ti in enumerate(tables):

            self._add_table(ti, cursor)
            #             timethis(self._add_table, args=(ti, cursor), msg='add_table')
            if i < n - 1:
                self._add_table_hook(cursor)
示例#13
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 def testRefcount(self):
     textedit = QTextEdit()
     textedit.setReadOnly(True)
     doc = textedit.document()
     cursor = QTextCursor(doc)
     cursor.insertText("PySide Rocks")
     ud = TestUserData({"Life": 42})
     self.assertEqual(sys.getrefcount(ud), 2)
     cursor.block().setUserData(ud)
     self.assertEqual(sys.getrefcount(ud), 3)
     ud2 = cursor.block().userData()
     self.assertEqual(sys.getrefcount(ud), 4)
     self.udata = weakref.ref(ud, None)
     del ud, ud2
     self.assertEqual(sys.getrefcount(self.udata()), 2)
示例#14
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    def _makeMatchSelection(self, block, columnIndex, matched):
        """Make matched or unmatched QTextEdit.ExtraSelection
        """
        selection = QTextEdit.ExtraSelection()

        if matched:
            bgColor = QColor('#9ED1FF')
        else:
            bgColor = QColor('#FFDFDF')

        selection.format.setBackground(bgColor)
        selection.cursor = QTextCursor(block)
        selection.cursor.setPositionInBlock(columnIndex)
        selection.cursor.movePosition(QTextCursor.Right,
                                      QTextCursor.KeepAnchor)

        return selection
示例#15
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 def gotoRow(self, row):
     rows = self.document().rootFrame().childFrames()
     if row >= len(rows):
         traceLogger.critical("invalid row %d > %d" % (row, len(rows) - 1))
         row = len(rows)
     cursor = QTextCursor(rows[row].lastCursorPosition())
     cursor.movePosition(QTextCursor.NextBlock)
     self.setTextCursor(cursor)
     self.ensureCursorVisible()
     cursor = QTextCursor(rows[row].childFrames()[0])
     self.setTextCursor(cursor)
     self.ensureCursorVisible()
示例#16
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    def testUndoRedo(self):
        text = 'foobar'
        doc = QTextDocument(text)

        self.assertFalse(doc.isRedoAvailable())
        self.assertTrue(doc.isUndoAvailable())
        self.assertEqual(doc.toPlainText(), text)

        cursor = QTextCursor(doc)
        doc.undo(cursor)

        self.assertTrue(doc.isRedoAvailable())
        self.assertFalse(doc.isUndoAvailable())
        self.assertEqual(doc.toPlainText(), '')

        doc.redo(cursor)

        self.assertFalse(doc.isRedoAvailable())
        self.assertTrue(doc.isUndoAvailable())
        self.assertEqual(doc.toPlainText(), text)
示例#17
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 def testRefcount(self):
     textedit = QTextEdit()
     textedit.setReadOnly(True)
     doc = textedit.document()
     cursor = QTextCursor(doc)
     cursor.insertText("PySide Rocks")
     ud = TestUserData({"Life": 42})
     self.assertEqual(sys.getrefcount(ud), 2)
     cursor.block().setUserData(ud)
     self.assertEqual(sys.getrefcount(ud), 3)
     ud2 = cursor.block().userData()
     self.assertEqual(sys.getrefcount(ud), 4)
     self.udata = weakref.ref(ud, None)
     del ud, ud2
     self.assertEqual(sys.getrefcount(self.udata()), 2)
示例#18
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 def testQTextCursorSelectedTableCells(self):
     obj = QTextCursor()
     self.assertEquals(obj.selectedTableCells(), (-1, -1, -1, -1))
示例#19
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    def testCase(self):
        editor = QTextEdit()
        cursor = QTextCursor(editor.textCursor())
        cursor.movePosition(QTextCursor.Start)

        mainFrame = cursor.currentFrame()

        plainCharFormat = QTextCharFormat()
        boldCharFormat = QTextCharFormat()
        boldCharFormat.setFontWeight(QFont.Bold)
        cursor.insertText(
            """
                          Text documents are represented by the 
                          QTextDocument class, rather than by QString objects. 
                          Each QTextDocument object contains information about 
                          the document's internal representation, its structure, 
                          and keeps track of modifications to provide undo/redo 
                          facilities. This approach allows features such as the 
                          layout management to be delegated to specialized 
                          classes, but also provides a focus for the framework.""",
            plainCharFormat)

        frameFormat = QTextFrameFormat()
        frameFormat.setMargin(32)
        frameFormat.setPadding(8)
        frameFormat.setBorder(4)
        cursor.insertFrame(frameFormat)

        cursor.insertText(
            """
                          Documents are either converted from external sources 
                          or created from scratch using Qt. The creation process 
                          can done by an editor widget, such as QTextEdit, or by 
                          explicit calls to the Scribe API.""", boldCharFormat)

        cursor = mainFrame.lastCursorPosition()
        cursor.insertText(
            """
                          There are two complementary ways to visualize the 
                          contents of a document: as a linear buffer that is 
                          used by editors to modify the contents, and as an 
                          object hierarchy containing structural information 
                          that is useful to layout engines. In the hierarchical 
                          model, the objects generally correspond to visual 
                          elements such as frames, tables, and lists. At a lower 
                          level, these elements describe properties such as the 
                          style of text used and its alignment. The linear 
                          representation of the document is used for editing and 
                          manipulation of the document's contents.""",
            plainCharFormat)

        frame = cursor.currentFrame()

        items = []

        #test iterator
        for i in frame:
            items.append(i)

        #test __iadd__
        b = frame.begin()
        i = 0
        while not b.atEnd():
            self.assertEqual(b, items[i])
            self.assert_(b.parentFrame(), items[i].parentFrame())
            b.__iadd__(1)
            i += 1

        #test __isub__
        b = frame.end()
        i = 0
        while i > 0:
            self.assertEqual(b, items[i])
            self.assert_(b.parentFrame(), items[i].parentFrame())
            b.__isub__(1)
            i -= 1
示例#20
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 def insertRow(self, row):
     self.insertingFrames = True
     document = self.document()
     rootFrame = document.rootFrame()
     rows = rootFrame.childFrames()
     if row > len(rows):
         traceLogger.critical("invalid row %d > %d" % (row, len(rows)))
         row = len(rows)
     if row == len(rows):
         cursor = QTextCursor(document)
         cursor.movePosition(QTextCursor.End)
     elif rows:
         cursor = QTextCursor(rows[row].firstCursorPosition())
         cursor.movePosition(QTextCursor.PreviousBlock)
     cursor.insertFrame(QtReduceRowFormat())
     cursor.insertFrame(QtReduceInput().frameFormat)
     position = cursor.position()
     cursor.clearSelection()
     cursor.setBlockFormat(QtReduceInput().blockFormat)
     cursor.setBlockCharFormat(QtReduceInput().charFormat)
     cursor.movePosition(QTextCursor.NextBlock)
     cursor.insertFrame(QtReduceNoResult().frameFormat)
     cursor.setBlockFormat(QtReduceNoResult().blockFormat)
     cursor.setBlockCharFormat(QtReduceNoResult().charFormat)
     cursor.insertText(QtReduceFrameView.NotEvaluated)
     cursor.setPosition(position)
     self.insertingFrames = False
示例#21
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文件: qrview.py 项目: webushka/reduce
 def insertRow(self,row):
     self.insertingFrames = True
     document = self.document()
     rootFrame = document.rootFrame()
     rows = rootFrame.childFrames()
     if row > len(rows):
         traceLogger.critical("invalid row %d > %d" % (row,len(rows)))
         row = len(rows)
     if row == len(rows):
         cursor = QTextCursor(document)
         cursor.movePosition(QTextCursor.End)
     elif rows:
         cursor = QTextCursor(rows[row].firstCursorPosition())
         cursor.movePosition(QTextCursor.PreviousBlock)
     cursor.insertFrame(QtReduceRowFormat())
     cursor.insertFrame(QtReduceInput().frameFormat)
     position = cursor.position()
     cursor.clearSelection()
     cursor.setBlockFormat(QtReduceInput().blockFormat)
     cursor.setBlockCharFormat(QtReduceInput().charFormat)
     cursor.movePosition(QTextCursor.NextBlock)
     cursor.insertFrame(QtReduceNoResult().frameFormat)
     cursor.setBlockFormat(QtReduceNoResult().blockFormat)
     cursor.setBlockCharFormat(QtReduceNoResult().charFormat)
     cursor.insertText(QtReduceFrameView.NotEvaluated)
     cursor.setPosition(position)
     self.insertingFrames = False
示例#22
0
 def goToLine(self, line):
     block = self.editor.document().findBlockByLNumber(line)
     cursor = QTextCursor(self.editor.document())
     cursor.setPosition(block.position())
     self.editor.setTextCursor(cursor)
示例#23
0
def cursorForPosition(codeEdit, line, column, selectEndOfLine=False,
                      selection=None, selectWordUnderCursor=False):
    """
    Return a QTextCursor set to line and column with the specified selection
    :param line:
    :param column:
    """
    tc = QTextCursor(codeEdit.document())
    tc.movePosition(QTextCursor.Start, QTextCursor.MoveAnchor)
    tc.movePosition(QTextCursor.Down, QTextCursor.MoveAnchor, line - 1)
    tc.setPosition(tc.position() + column - 1)
    if selectEndOfLine is True:
        tc.movePosition(QTextCursor.EndOfLine, QTextCursor.KeepAnchor)
    elif isinstance(selection, int):
        tc.movePosition(QTextCursor.Right, QTextCursor.KeepAnchor, selection)
    elif selectWordUnderCursor is True:
        tc.select(QTextCursor.WordUnderCursor)
    codeEdit.setTextCursor(tc)
    return tc
示例#24
0
class TextFormat():

    def __init__(self, selection, button):
        self.selection = selection
        self.cursor = QTextCursor(self.selection.textEdit.textCursor())
        self.format = QTextCharFormat()
        self.button = button

    def bold_button_behavior(self):

        if self.selection.textEdit.textCursor().hasSelection():
            return self.bold_selection()

        if self.selection.textEdit.fontWeight() == QFont.Bold:
            self.button.setDown(False)
            return self.selection.textEdit.setFontWeight(QFont.Normal)

        self.button.setDown(True)
        return self.selection.textEdit.setFontWeight(QFont.Bold)

    def bold_selection(self):

        if self.selection.bold_button.isDown():
            self.selection.bold_button.setDown(False)
            return self.selection.textEdit.setFontWeight(QFont.Normal)

        if not self.selection.textEdit.textCursor().charFormat().fontWeight() == QFont.Bold:
            self.format.setFontWeight(QFont.Bold)
            self.selection.bold_button.setDown(True)
            return self.cursor.mergeCharFormat(self.format)

        return self.selection.textEdit.setFontWeight(QFont.Normal)

    def italic_button_behavior(self):
        if self.selection.textEdit.textCursor().hasSelection():
            return self.italic_selection()

        if self.selection.textEdit.fontItalic():
            self.button.setDown(False)
            return self.selection.textEdit.setFontItalic(False)

        self.button.setDown(True)
        return self.selection.textEdit.setFontItalic(True)

    def italic_selection(self):

        if self.selection.italic_button.isDown():
            self.selection.italic_button.setDown(False)
            return self.selection.textEdit.setFontItalic()

        if not self.selection.textEdit.textCursor().charFormat().fontItalic():
            self.format.setFontItalic(True)
            return self.cursor.mergeCharFormat(self.format)

        self.selection.italic_button.setDown(False)
        return self.selection.textEdit.setFontItalic(False)

    def underline_button_behavior(self):

        if self.selection.textEdit.textCursor().hasSelection():
            return self.underline_selection()

        if self.selection.textEdit.fontUnderline():
            self.button.setDown(False)
            return self.selection.textEdit.setFontUnderline(False)

        self.button.setDown(True)
        return self.selection.textEdit.setFontUnderline(True)

    def underline_selection(self):

        if self.selection.underline_button.isDown():
            self.selection.underline_button.setDown(False)
            return self.selection.textEdit.setFontUnderline(False)

        if not self.selection.textEdit.textCursor().charFormat().fontUnderline():
            self.format.setFontUnderline(True)
            return self.cursor.mergeCharFormat(self.format)

        return self.selection.textEdit.setFontUnderline(False)

    def strikeout_button_behavior(self):

        if self.selection.textEdit.textCursor().hasSelection():
            return self.strikeout_selection()

        if self.selection.textEdit.textCursor().charFormat().fontStrikeOut():
            self.button.setDown(False)
            return self.selection.textEdit.textCursor().charFormat().setFontStrikeOut(False)

        self.button.setDown(True)
        formatter = QTextCharFormat()
        formatter.setFontStrikeOut(True)
        return self.selection.textEdit.setCurrentCharFormat(formatter)

    def strikeout_selection(self):

        if self.selection.textEdit.textCursor().charFormat().fontStrikeOut():
            self.selection.strikeout_button.setDown(False)
            self.format.setFontStrikeOut(False)
            return self.cursor.mergeCharFormat(self.format)

        if not self.selection.textEdit.textCursor().charFormat().fontStrikeOut():
            self.format.setFontStrikeOut(True)
            return self.cursor.mergeCharFormat(self.format)

        return self.selection.textEdit.textCursor().charFormat()
示例#25
0
 def __init__(self, selection, button):
     self.selection = selection
     self.cursor = QTextCursor(self.selection.textEdit.textCursor())
     self.format = QTextCharFormat()
     self.button = button
 def testQTextCursorSelectedTableCells(self):
     obj = QTextCursor()
     self.assertEquals(obj.selectedTableCells(), (-1, -1, -1, -1))
示例#27
0
文件: lines.py 项目: Darriall/editor
 def _setBlockText(blockIndex, text):
     cursor = QTextCursor(self._doc.findBlockByNumber(blockIndex))
     cursor.movePosition(QTextCursor.EndOfBlock, QTextCursor.KeepAnchor)
     cursor.insertText(text)
示例#28
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文件: lines.py 项目: Darriall/editor
 def insert(self, index, text):
     """Insert line to the document
     """
     if index < 0 or index > self._doc.blockCount():
         raise IndexError('Invalid block index', index)
     
     if index == 0:  # first
         cursor = QTextCursor(self._doc.firstBlock())
         cursor.insertText(text)
         cursor.insertBlock()
     elif index != self._doc.blockCount():  # not the last
         cursor = QTextCursor(self._doc.findBlockByNumber(index).previous())
         cursor.movePosition(QTextCursor.EndOfBlock)
         cursor.insertBlock()
         cursor.insertText(text)
     else:  # last append to the end
         self.append(text)
示例#29
0
文件: lines.py 项目: Darriall/editor
 def _removeBlock(blockIndex):
     block = self._doc.findBlockByNumber(blockIndex)
     if block.next().isValid():  # not the last
         cursor = QTextCursor(block)
         cursor.movePosition(QTextCursor.NextBlock, QTextCursor.KeepAnchor)
     elif block.previous().isValid():  # the last, not the first
         cursor = QTextCursor(block.previous())
         cursor.movePosition(QTextCursor.EndOfBlock)
         cursor.movePosition(QTextCursor.NextBlock, QTextCursor.KeepAnchor)
         cursor.movePosition(QTextCursor.EndOfBlock, QTextCursor.KeepAnchor)
     else:  # only one block
         cursor = QTextCursor(block)
         cursor.movePosition(QTextCursor.EndOfBlock, QTextCursor.KeepAnchor)
     cursor.removeSelectedText()
示例#30
0
文件: bug_688.py 项目: Hasimir/PySide
    def testCase(self):
        editor = QTextEdit()
        cursor = QTextCursor(editor.textCursor())
        cursor.movePosition(QTextCursor.Start)
   
        mainFrame = cursor.currentFrame()
        
        plainCharFormat = QTextCharFormat()
        boldCharFormat = QTextCharFormat()
        boldCharFormat.setFontWeight(QFont.Bold);
        cursor.insertText("""
                          Text documents are represented by the 
                          QTextDocument class, rather than by QString objects. 
                          Each QTextDocument object contains information about 
                          the document's internal representation, its structure, 
                          and keeps track of modifications to provide undo/redo 
                          facilities. This approach allows features such as the 
                          layout management to be delegated to specialized 
                          classes, but also provides a focus for the framework.""",
                          plainCharFormat)

        frameFormat = QTextFrameFormat()
        frameFormat.setMargin(32)
        frameFormat.setPadding(8)
        frameFormat.setBorder(4)
        cursor.insertFrame(frameFormat)

        cursor.insertText("""
                          Documents are either converted from external sources 
                          or created from scratch using Qt. The creation process 
                          can done by an editor widget, such as QTextEdit, or by 
                          explicit calls to the Scribe API.""",
                          boldCharFormat)

        cursor = mainFrame.lastCursorPosition()
        cursor.insertText("""
                          There are two complementary ways to visualize the 
                          contents of a document: as a linear buffer that is 
                          used by editors to modify the contents, and as an 
                          object hierarchy containing structural information 
                          that is useful to layout engines. In the hierarchical 
                          model, the objects generally correspond to visual 
                          elements such as frames, tables, and lists. At a lower 
                          level, these elements describe properties such as the 
                          style of text used and its alignment. The linear 
                          representation of the document is used for editing and 
                          manipulation of the document's contents.""",
                          plainCharFormat)

        
        frame = cursor.currentFrame()

        items = []

        #test iterator
        for i in frame:
            items.append(i)

        #test __iadd__
        b = frame.begin()
        i = 0
        while not b.atEnd():
            self.assertEqual(b, items[i])
            self.assert_(b.parentFrame(), items[i].parentFrame())
            b.__iadd__(1)
            i += 1

        #test __isub__
        b = frame.end()
        i = 0
        while i > 0:
            self.assertEqual(b, items[i])
            self.assert_(b.parentFrame(), items[i].parentFrame())
            b.__isub__(1)
            i -= 1