Question

我正在尝试在QScintilla中实现一个可以进行多项选择的切换注释功能。不幸的是我不知道怎么做，到目前为止我已经提出了这个代码：

import sys
import re
import math

from PyQt5.Qt import *  # noqa

from PyQt5.Qsci import QsciScintilla
from PyQt5 import Qsci
from PyQt5.Qsci import QsciLexerCPP


class Commenter():

    def __init__(self, sci, comment_str):
        self.sci = sci
        self.comment_str = comment_str

    def is_commented_line(self, line):
        return line.strip().startswith(self.comment_str)

    def toggle_comment_block(self):
        sci = self.sci

        line, index = sci.getCursorPosition()

        if sci.hasSelectedText() and self.is_commented_line(sci.text(sci.getSelection()[0])):
            self.uncomment_line_or_selection()
        elif not self.is_commented_line(sci.text(line)):
            self.comment_line_or_selection()
        else:
            start_line = line
            while start_line > 0 and self.is_commented_line(sci.text(start_line - 1)):
                start_line -= 1

            end_line = line
            lines = sci.lines()
            while end_line < lines and self.is_commented_line(sci.text(end_line + 1)):
                end_line += 1

            sci.setSelection(start_line, 0, end_line, sci.lineLength(end_line))
            self.uncomment_line_or_selection()
            sci.setCursorPosition(line, index - len(self.comment_str))

    def comment_line_or_selection(self):
        sci = self.sci

        if sci.hasSelectedText():
            self.comment_selection()
        else:
            self.comment_line()

    def uncomment_line_or_selection(self):
        sci = self.sci

        if sci.hasSelectedText():
            self.uncomment_selection()
        else:
            self.uncomment_line()

    def comment_line(self):
        sci = self.sci

        line, index = sci.getCursorPosition()
        sci.beginUndoAction()
        sci.insertAt(self.comment_str, line, sci.indentation(line))
        sci.endUndoAction()

    def uncomment_line(self):
        sci = self.sci

        line, index = sci.getCursorPosition()

        if not self.is_commented_line(sci.text(line)):
            return

        sci.beginUndoAction()
        sci.setSelection(
            line, sci.indentation(line),
            line, sci.indentation(line) + len(self.comment_str)
        )
        sci.removeSelectedText()
        sci.endUndoAction()

    def comment_selection(self):
        sci = self.sci

        if not sci.hasSelectedText():
            return

        line_from, index_from, line_to, index_to = sci.getSelection()
        if index_to == 0:
            end_line = line_to - 1
        else:
            end_line = line_to

        sci.beginUndoAction()
        for line in range(line_from, end_line + 1):
            sci.insertAt(self.comment_str, line, sci.indentation(line))

        sci.setSelection(line_from, 0, end_line + 1, 0)
        sci.endUndoAction()

    def uncomment_selection(self):
        sci = self.sci

        if not sci.hasSelectedText():
            return

        line_from, index_from, line_to, index_to = sci.getSelection()
        if index_to == 0:
            end_line = line_to - 1
        else:
            end_line = line_to

        sci.beginUndoAction()
        for line in range(line_from, end_line + 1):
            if not self.is_commented_line(sci.text(line)):
                continue

            sci.setSelection(
                line, sci.indentation(line),
                line,
                sci.indentation(line) + len(self.comment_str)
            )
            sci.removeSelectedText()

            if line == line_from:
                index_from -= len(self.comment_str)
            if index_from < 0:
                index_from = 0

            if line == line_to:
                index_to -= len(self.comment_str)
            if index_to < 0:
                index_to = 0

        sci.setSelection(line_from, index_from, line_to, index_to)
        sci.endUndoAction()


class Foo(QsciScintilla):

    def __init__(self, parent=None):
        super().__init__(parent)

        # http://www.scintilla.org/ScintillaDoc.html#Folding
        self.setFolding(QsciScintilla.BoxedTreeFoldStyle)

        # Indentation
        self.setIndentationsUseTabs(False)
        self.setIndentationWidth(4)
        self.setBackspaceUnindents(True)
        self.setIndentationGuides(True)

        # Set the default font
        self.font = QFont()
        self.font.setFamily('Consolas')
        self.font.setFixedPitch(True)
        self.font.setPointSize(10)
        self.setFont(self.font)
        self.setMarginsFont(self.font)

        # Margin 0 is used for line numbers
        fontmetrics = QFontMetrics(self.font)
        self.setMarginsFont(self.font)
        self.setMarginWidth(0, fontmetrics.width("000") + 6)
        self.setMarginLineNumbers(0, True)
        self.setMarginsBackgroundColor(QColor("#cccccc"))

        # Indentation
        self.setIndentationsUseTabs(False)
        self.setIndentationWidth(4)
        self.setBackspaceUnindents(True)

        lexer = QsciLexerCPP()
        lexer.setFoldAtElse(True)
        lexer.setFoldComments(True)
        lexer.setFoldCompact(False)
        lexer.setFoldPreprocessor(True)
        self.setLexer(lexer)

        # Use raw messages to Scintilla here
        # (all messages are documented here: http://www.scintilla.org/ScintillaDoc.html)
        # Ensure the width of the currently visible lines can be scrolled
        self.SendScintilla(QsciScintilla.SCI_SETSCROLLWIDTHTRACKING, 1)
        # Multiple cursor support
        self.SendScintilla(QsciScintilla.SCI_SETMULTIPLESELECTION, True)
        self.SendScintilla(QsciScintilla.SCI_SETMULTIPASTE, 1)
        self.SendScintilla(
            QsciScintilla.SCI_SETADDITIONALSELECTIONTYPING, True)

        # Comment feature goes here
        self.commenter = Commenter(self, "//")
        QShortcut(QKeySequence("Ctrl+7"), self,
                  self.commenter.toggle_comment_block)


def main():
    app = QApplication(sys.argv)
    ex = Foo()
    ex.setText("""\
#include <iostream>
using namespace std;

void Function0() {
    cout << "Function0";
}

void Function1() {
    cout << "Function1";
}

void Function2() {
    cout << "Function2";
}

void Function3() {
    cout << "Function3";
}


int main(void) {
    if (1) {
        if (1) {
            if (1) {
                if (1) {
                    int yay;
                }
            }
        }
    }

    if (1) {
        if (1) {
            if (1) {
                if (1) {
                    int yay2;
                }
            }
        }
    }

    return 0;
}\
    """)
    ex.resize(800, 600)
    ex.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

相关的Qscintilla文档住在这里：

现在该功能只支持一个选择/光标，而评论的方式真的很难看。正如您在代码中看到的那样，如果在按住鼠标的同时按ctrl，您将能够创建多个光标/选择。

我现在几乎不知道如何实现：

1）我希望这些评论能够完全一致，也就是说，它们应该从同一级别的缩进开始。现有功能现在产生丑陋的未对齐注释，例如我称之为“良好对齐”的注释：

2）现在只考虑一个光标/选择。如何循环游标/选择以应用toggle_selection函数？

3）我猜你是否循环选择结果将是在特定行中使用偶数个游标不会对该行进行注释（注释，取消注释），例如，类似这样的事情：

4）特定行中的奇数个游标会影响该行，因为（注释，取消注释，注释），例如，类似这样：

5）如果你遍历游标/选择，你最终会产生类似下面的输出。

编辑：第一稿

class Commenter():

    def __init__(self, sci, comment_str):
        self.sci = sci
        self.comment_str = comment_str

    def selections(self):
        regions = []
        for i in range(self.sci.SendScintilla(QsciScintilla.SCI_GETSELECTIONS)):
            regions.append({
                'begin': self.selection_start(i),
                'end': self.selection_end(i)
            })

        return regions

    def selection_start(self, selection):
        return self.sci.SendScintilla(QsciScintilla.SCI_GETSELECTIONNSTART, selection)

    def selection_end(self, selection):
        return self.sci.SendScintilla(QsciScintilla.SCI_GETSELECTIONNEND, selection)

    def text(self, *args):
        return self.sci.text(*args)

    def run(self):
        send_scintilla = self.sci.SendScintilla

        for region in self.selections():
            print(region)
            print(repr(self.text(region['begin'],region['end'])))

EDIT2：我发现我试图实现的这个功能的源代码可以在SublimeText Default.sublime-package（zip文件）comments.py上找到。该代码不仅支持普通评论//，还支持阻止评论/* ... */。主要问题是将代码移植到QScintilla似乎非常棘手：/

Answer 1

QsciScintilla似乎没有公开所有Scintilla的功能，但是通过SendScintilla我们可以访问其余部分，就像您似乎已经发现的那样。所以Commenter类可能看起来像这样（棘手的部分是恢复选择，因为Scintilla在插入时取消选择）：

import sys
import re
import math

from PyQt5.Qt import *  # noqa

from PyQt5.Qsci import QsciScintilla
from PyQt5 import Qsci
from PyQt5.Qsci import QsciLexerCPP


class Commenter():

    def __init__(self, sci, comment_str):
        self.sci = sci
        self.comment_str = comment_str
        self.sel_regions = []

    def toggle_comments(self):
        lines = self.selected_lines()
        if len(lines) <= 0:
            return
        all_commented = True
        for line in lines:
            if not self.sci.text(line).strip().startswith(self.comment_str):
                all_commented = False
        if not all_commented:
            self.comment_lines(lines)
        else:
            self.uncomment_lines(lines)

    def selections(self):
        regions = []
        for i in range(self.sci.SendScintilla(QsciScintilla.SCI_GETSELECTIONS)):
            regions.append({
                'begin': self.sci.SendScintilla(QsciScintilla.SCI_GETSELECTIONNSTART, i),
                'end': self.sci.SendScintilla(QsciScintilla.SCI_GETSELECTIONNEND, i)
            })

        return regions

    def selected_lines(self):
        self.sel_regions = []
        all_lines = []
        regions = self.selections()
        for r in regions:
            start_line = self.sci.SendScintilla(QsciScintilla.SCI_LINEFROMPOSITION, r['begin'])
            end_line = self.sci.SendScintilla(QsciScintilla.SCI_LINEFROMPOSITION, r['end'])
            for cur_line in range(start_line, end_line + 1):
                if not cur_line in all_lines:
                    all_lines.append(cur_line)
            if r['begin'] <= r['end']:
                self.sel_regions.append(r)
        return all_lines

    def comment_lines(self, lines):
        indent = self.sci.indentation(lines[0])
        for line in lines:
            indent = min(indent, self.sci.indentation(line))
        self.sci.beginUndoAction()
        for line in lines:
            self.adjust_selections(line, indent)
            self.sci.insertAt(self.comment_str, line, indent)
        self.sci.endUndoAction()
        self.restore_selections()

    def uncomment_lines(self, lines):
        self.sci.beginUndoAction()
        for line in lines:
            line_start = self.sci.SendScintilla(QsciScintilla.SCI_POSITIONFROMLINE, line)
            line_end = self.sci.SendScintilla(QsciScintilla.SCI_GETLINEENDPOSITION, line)
            if line_start == line_end:
                continue
            if line_end - line_start < len(self.comment_str):
                continue
            done = False
            for c in range(line_start, line_end - len(self.comment_str) + 1):
                source_str = self.sci.text(c, c + len(self.comment_str))
                if(source_str == self.comment_str):
                    self.sci.SendScintilla(QsciScintilla.SCI_DELETERANGE, c, len(self.comment_str))
                    break
        self.sci.endUndoAction()

    def restore_selections(self):
        if(len(self.sel_regions) > 0):
            first = True
            for r in self.sel_regions:
                if first:
                    self.sci.SendScintilla(QsciScintilla.SCI_SETSELECTION, r['begin'], r['end'])
                    first = False
                else:
                    self.sci.SendScintilla(QsciScintilla.SCI_ADDSELECTION, r['begin'], r['end'])

    def adjust_selections(self, line, indent):
        for r in self.sel_regions:
            if self.sci.positionFromLineIndex(line, indent) <= r['begin']:
                r['begin'] += len(self.comment_str)
                r['end'] += len(self.comment_str)
            elif self.sci.positionFromLineIndex(line, indent) < r['end']:
                r['end'] += len(self.comment_str)



class Foo(QsciScintilla):

    def __init__(self, parent=None):
        super().__init__(parent)

        # http://www.scintilla.org/ScintillaDoc.html#Folding
        self.setFolding(QsciScintilla.BoxedTreeFoldStyle)

        # Indentation
        self.setIndentationsUseTabs(False)
        self.setIndentationWidth(4)
        self.setBackspaceUnindents(True)
        self.setIndentationGuides(True)

        # Set the default font
        self.font = QFont()
        self.font.setFamily('Consolas')
        self.font.setFixedPitch(True)
        self.font.setPointSize(10)
        self.setFont(self.font)
        self.setMarginsFont(self.font)

        # Margin 0 is used for line numbers
        fontmetrics = QFontMetrics(self.font)
        self.setMarginsFont(self.font)
        self.setMarginWidth(0, fontmetrics.width("000") + 6)
        self.setMarginLineNumbers(0, True)
        self.setMarginsBackgroundColor(QColor("#cccccc"))

        # Indentation
        self.setIndentationsUseTabs(False)
        self.setIndentationWidth(4)
        self.setBackspaceUnindents(True)

        lexer = QsciLexerCPP()
        lexer.setFoldAtElse(True)
        lexer.setFoldComments(True)
        lexer.setFoldCompact(False)
        lexer.setFoldPreprocessor(True)
        self.setLexer(lexer)

        # Use raw messages to Scintilla here
        # (all messages are documented here: http://www.scintilla.org/ScintillaDoc.html)
        # Ensure the width of the currently visible lines can be scrolled
        self.SendScintilla(QsciScintilla.SCI_SETSCROLLWIDTHTRACKING, 1)
        # Multiple cursor support
        self.SendScintilla(QsciScintilla.SCI_SETMULTIPLESELECTION, True)
        self.SendScintilla(QsciScintilla.SCI_SETMULTIPASTE, 1)
        self.SendScintilla(
            QsciScintilla.SCI_SETADDITIONALSELECTIONTYPING, True)

        # Comment feature goes here
        self.commenter = Commenter(self, "//")
        QShortcut(QKeySequence("Ctrl+7"), self,
                  self.commenter.toggle_comments)


def main():
    app = QApplication(sys.argv)
    ex = Foo()
    ex.setText("""\
#include <iostream>
using namespace std;

void Function0() {
    cout << "Function0";
}

void Function1() {
    cout << "Function1";
}

void Function2() {
    cout << "Function2";
}

void Function3() {
    cout << "Function3";
}


int main(void) {
    if (1) {
        if (1) {
            if (1) {
                if (1) {
                    int yay;
                }
            }
        }
    }

    if (1) {
        if (1) {
            if (1) {
                if (1) {
                    int yay2;
                }
            }
        }
    }

    return 0;
}\
    """)
    ex.resize(800, 600)
    ex.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

Answer 2

这是一个子类化QsciScintilla编辑器的简单示例，通过使用Ctrl+Mouse设置多个选项然后按Ctrl+K添加了类似SublimeText的注释。

<强>更新更新了注释，以便在每个选择的最小缩进级别注释/取消注释，并合并相邻的选择。

# Import the PyQt5 module with some of the GUI widgets
import PyQt5.QtWidgets
import PyQt5.QtGui
import PyQt5.QtCore
# Import the QScintilla module
import PyQt5.Qsci
# Import Python's sys module needed to get the application arguments
import sys

"""
Custom editor with a simple commenting feature
similar to what SublimeText does
"""
class MyCommentingEditor(PyQt5.Qsci.QsciScintilla):
    comment_string = "// "
    line_ending = "\n"

    def keyPressEvent(self, event):
        # Execute the superclasses event
        super().keyPressEvent(event)
        # Check pressed key information
        key = event.key()
        key_modifiers = PyQt5.QtWidgets.QApplication.keyboardModifiers()
        if (key == PyQt5.QtCore.Qt.Key_K and 
            key_modifiers == PyQt5.QtCore.Qt.ControlModifier):
                self.toggle_commenting()

    def toggle_commenting(self):
        # Check if the selections are valid
        selections = self.get_selections()
        if selections == None:
            return
        # Merge overlapping selections
        while self.merge_test(selections) == True:
            selections = self.merge_selections(selections)
        # Start the undo action that can undo all commenting at once
        self.beginUndoAction()
        # Loop over selections and comment them
        for i, sel in enumerate(selections):
            if self.text(sel[0]).lstrip().startswith(self.comment_string):
                self.set_commenting(sel[0], sel[1], self._uncomment)
            else:
                self.set_commenting(sel[0], sel[1], self._comment)
        # Select back the previously selected regions
        self.SendScintilla(self.SCI_CLEARSELECTIONS)
        for i, sel in enumerate(selections):
            start_index = self.positionFromLineIndex(sel[0], 0)
            # Check if ending line is the last line in the editor
            last_line = sel[1]
            if last_line == self.lines() - 1:
                end_index = self.positionFromLineIndex(sel[1], len(self.text(last_line)))
            else:
                end_index = self.positionFromLineIndex(sel[1], len(self.text(last_line))-1)
            if i == 0:
                self.SendScintilla(self.SCI_SETSELECTION, start_index, end_index)
            else:
                self.SendScintilla(self.SCI_ADDSELECTION, start_index, end_index)
        # Set the end of the undo action
        self.endUndoAction()

    def get_selections(self):
        # Get the selection and store them in a list
        selections = []
        for i in range(self.SendScintilla(self.SCI_GETSELECTIONS)):
            selection = (
                self.SendScintilla(self.SCI_GETSELECTIONNSTART, i),
                self.SendScintilla(self.SCI_GETSELECTIONNEND, i)
            )
            # Add selection to list
            from_line, from_index = self.lineIndexFromPosition(selection[0])
            to_line, to_index = self.lineIndexFromPosition(selection[1])
            selections.append((from_line, to_line))
        selections.sort()
        # Return selection list
        return selections

    def merge_test(self, selections):
        """
        Test if merging of selections is needed
        """
        for i in range(1, len(selections)):
            # Get the line numbers
            previous_start_line = selections[i-1][0]
            previous_end_line = selections[i-1][1]
            current_start_line = selections[i][0]
            current_end_line = selections[i][1]
            if previous_end_line == current_start_line:
                return True
        # Merging is not needed
        return False

    def merge_selections(self, selections):
        """
        This function merges selections with overlapping lines
        """
        # Test if merging is required
        if len(selections) < 2:
            return selections
        merged_selections = []
        skip_flag = False
        for i in range(1, len(selections)):
            # Get the line numbers
            previous_start_line = selections[i-1][0]
            previous_end_line = selections[i-1][1]
            current_start_line = selections[i][0]
            current_end_line = selections[i][1]
            # Test for merge
            if previous_end_line == current_start_line and skip_flag == False:
                merged_selections.append(
                    (previous_start_line, current_end_line)
                )
                skip_flag = True
            else:
                if skip_flag == False:
                    merged_selections.append(
                        (previous_start_line, previous_end_line)
                    )
                skip_flag = False
                # Add the last selection only if it was not merged
                if i == (len(selections) - 1):
                    merged_selections.append(
                        (current_start_line, current_end_line)
                    )
        # Return the merged selections
        return merged_selections

    def set_commenting(self, arg_from_line, arg_to_line, func):
        # Get the cursor information
        from_line = arg_from_line
        to_line = arg_to_line
        # Check if ending line is the last line in the editor
        last_line = to_line
        if last_line == self.lines() - 1:
            to_index = len(self.text(to_line))
        else:
            to_index = len(self.text(to_line))-1
        # Set the selection from the beginning of the cursor line
        # to the end of the last selection line
        self.setSelection(
            from_line, 0, to_line, to_index
        )
        # Get the selected text and split it into lines
        selected_text = self.selectedText()
        selected_list = selected_text.split("\n")
        # Find the smallest indent level
        indent_levels = []
        for line in selected_list:
            indent_levels.append(len(line) - len(line.lstrip()))
        min_indent_level = min(indent_levels)
        # Add the commenting character to every line
        for i, line in enumerate(selected_list):
            selected_list[i] = func(line, min_indent_level)
        # Replace the whole selected text with the merged lines
        # containing the commenting characters
        replace_text = self.line_ending.join(selected_list)
        self.replaceSelectedText(replace_text)

    def _comment(self, line, indent_level):
        if line.strip() != "":
            return line[:indent_level] + self.comment_string + line[indent_level:]
        else:
            return line

    def _uncomment(self, line, indent_level):
        if line.strip().startswith(self.comment_string):
            return line.replace(self.comment_string, "", 1)
        else:
            return line

有关完整示例，请参阅https://github.com/matkuki/qscintilla_docs/blob/master/examples/commenting.py

我将PyQt5与QScintilla 2.10.4和Python 3.6一起使用。

Answer 3

以下内容应说明循环错误的位置。我会留给你实现切换功能。

更新以包含原始帖子的完整来源并将评论移至评论者类。

import sys
import re
import math

from PyQt5.Qt import *  # noqa

from PyQt5.Qsci import QsciScintilla
from PyQt5 import Qsci
from PyQt5.Qsci import QsciLexerCPP


class Commenter():

    def __init__(self, sci, comment_str):
        self.sci = sci
        self.comment_str = comment_str

    def is_commented_line(self, line):
        return line.strip().startswith(self.comment_str)

    def toggle_comment_block(self):
        sci = self.sci

        line, index = sci.getCursorPosition()

        if sci.hasSelectedText() and self.is_commented_line(sci.text(sci.getSelection()[0])):
            self.uncomment_line_or_selection()
        elif not self.is_commented_line(sci.text(line)):
            self.comment_line_or_selection()
        else:
            start_line = line
            while start_line > 0 and self.is_commented_line(sci.text(start_line - 1)):
                start_line -= 1

            end_line = line
            lines = sci.lines()
            while end_line < lines and self.is_commented_line(sci.text(end_line + 1)):
                end_line += 1

            sci.setSelection(start_line, 0, end_line, sci.lineLength(end_line))
            self.uncomment_line_or_selection()
            sci.setCursorPosition(line, index - len(self.comment_str))

    def comment_line_or_selection(self):
        sci = self.sci

        if sci.hasSelectedText():
            self.comment_selection()
        else:
            self.comment_line()

    def uncomment_line_or_selection(self):
        sci = self.sci

        if sci.hasSelectedText():
            self.uncomment_selection()
        else:
            self.uncomment_line()

    def comment_line(self):
        sci = self.sci

        line, index = sci.getCursorPosition()
        sci.beginUndoAction()
        sci.insertAt(self.comment_str, line, sci.indentation(line))
        sci.endUndoAction()

    def uncomment_line(self):
        sci = self.sci

        line, index = sci.getCursorPosition()

        if not self.is_commented_line(sci.text(line)):
            return

        sci.beginUndoAction()
        sci.setSelection(
            line, sci.indentation(line),
            line, sci.indentation(line) + len(self.comment_str)
        )
        sci.removeSelectedText()
        sci.endUndoAction()

    def comment_selection(self):
        sci = self.sci

        if not sci.hasSelectedText():
            return

        line_from, index_from, line_to, index_to = sci.getSelection()
        if index_to == 0:
            end_line = line_to - 1
        else:
            end_line = line_to

        sci.beginUndoAction()
        for line in range(line_from, end_line + 1):
            sci.insertAt(self.comment_str, line, sci.indentation(line))

        sci.setSelection(line_from, 0, end_line + 1, 0)
        sci.endUndoAction()

    def uncomment_selection(self):
        sci = self.sci

        if not sci.hasSelectedText():
            return

        line_from, index_from, line_to, index_to = sci.getSelection()
        if index_to == 0:
            end_line = line_to - 1
        else:
            end_line = line_to

        sci.beginUndoAction()
        for line in range(line_from, end_line + 1):
            if not self.is_commented_line(sci.text(line)):
                continue

            sci.setSelection(
                line, sci.indentation(line),
                line,
                sci.indentation(line) + len(self.comment_str)
            )
            sci.removeSelectedText()

            if line == line_from:
                index_from -= len(self.comment_str)
            if index_from < 0:
                index_from = 0

            if line == line_to:
                index_to -= len(self.comment_str)
            if index_to < 0:
                index_to = 0

        sci.setSelection(line_from, index_from, line_to, index_to)
        sci.endUndoAction()

    def comment_blocks(self):
        sci = self.sci
        comment_chars = self.comment_str
        selections = [(sci.SendScintilla(QsciScintilla.SCI_GETSELECTIONNSTART, i), sci.SendScintilla(QsciScintilla.SCI_GETSELECTIONNEND, i)) for i in range(self.sci.SendScintilla(QsciScintilla.SCI_GETSELECTIONS))]
        def block_indentation(lineFrom, lineTo):
            """Get the minimum indentation for the line range"""
            indent = min(sci.indentation(line) for line in range(lineFrom, lineTo))
            return indent

        def comment(selFrom, selTo):
            lineFrom = selFrom[0]
            lineTo = selTo[0] + 1
            indent = block_indentation(lineFrom, lineTo)
            for line in range(lineFrom, lineTo):
                text = sci.text(line).lstrip()
                if not text:
                    sci.insertAt(' ' * indent + comment_chars, line, 0)  # Make sure blank lines are preserved
                else:
                    sci.insertAt(comment_chars, line, indent)
            # sci.setSelection(lineFrom, selFrom[1], lineTo, selTo[1])  # Restore selection TODO: for muliple selections see init_test_selections()
        sci.beginUndoAction()
        for sel in reversed(selections):  # Positions will change due to inserted comment chars..so run loop in reverse
            sel_from = sci.lineIndexFromPosition(sel[0])
            sel_to = sci.lineIndexFromPosition(sel[1])
            comment(sel_from, sel_to)
        sci.endUndoAction()

class Foo(QsciScintilla):

    def __init__(self, parent=None):
        super().__init__(parent)

        # http://www.scintilla.org/ScintillaDoc.html#Folding
        self.setFolding(QsciScintilla.BoxedTreeFoldStyle)

        # Indentation
        self.setIndentationsUseTabs(False)
        self.setIndentationWidth(4)
        self.setBackspaceUnindents(True)
        self.setIndentationGuides(True)

        # Set the default font
        self.font = QFont()
        self.font.setFamily('Consolas')
        self.font.setFixedPitch(True)
        self.font.setPointSize(10)
        self.setFont(self.font)
        self.setMarginsFont(self.font)

        # Margin 0 is used for line numbers
        fontmetrics = QFontMetrics(self.font)
        self.setMarginsFont(self.font)
        self.setMarginWidth(0, fontmetrics.width("000") + 6)
        self.setMarginLineNumbers(0, True)
        self.setMarginsBackgroundColor(QColor("#cccccc"))

        # Indentation
        self.setIndentationsUseTabs(False)
        self.setIndentationWidth(4)
        self.setBackspaceUnindents(True)

        lexer = QsciLexerCPP()
        lexer.setFoldAtElse(True)
        lexer.setFoldComments(True)
        lexer.setFoldCompact(False)
        lexer.setFoldPreprocessor(True)
        self.setLexer(lexer)

        # Use raw messages to Scintilla here
        # (all messages are documented here: http://www.scintilla.org/ScintillaDoc.html)
        # Ensure the width of the currently visible lines can be scrolled
        self.SendScintilla(QsciScintilla.SCI_SETSCROLLWIDTHTRACKING, 1)
        # Multiple cursor support
        self.SendScintilla(QsciScintilla.SCI_SETMULTIPLESELECTION, True)
        self.SendScintilla(QsciScintilla.SCI_SETMULTIPASTE, 1)
        self.SendScintilla(
            QsciScintilla.SCI_SETADDITIONALSELECTIONTYPING, True)

        # Comment feature goes here
        self.commenter = Commenter(self, "//")
        # QShortcut(QKeySequence("Ctrl+7"), self, self.commenter.toggle_comment_block)
        QShortcut(QKeySequence("Ctrl+7"), self, self.commenter.comment_blocks)


    def init_test_selections(self):
        # initialize multiple selections
        offset1 = self.positionFromLineIndex(21, 0)
        offset2 = self.positionFromLineIndex(29, 5)
        self.SendScintilla(self.SCI_SETSELECTION, offset1, offset2)

        offset1 = self.positionFromLineIndex(31, 0)
        offset2 = self.positionFromLineIndex(33, 20)
        self.SendScintilla(self.SCI_ADDSELECTION, offset1, offset2)

        offset1 = self.positionFromLineIndex(37, 0)
        offset2 = self.positionFromLineIndex(39, 5)
        self.SendScintilla(self.SCI_ADDSELECTION, offset1, offset2)

    def init_test_selections2(self):
        # initialize multiple selections
        offset1 = self.positionFromLineIndex(11, 0)
        offset2 = self.positionFromLineIndex(13, 1)
        self.SendScintilla(self.SCI_SETSELECTION, offset1, offset2)

        offset1 = self.positionFromLineIndex(15, 0)
        offset2 = self.positionFromLineIndex(17, 1)
        self.SendScintilla(self.SCI_ADDSELECTION, offset1, offset2)


def main():
    app = QApplication(sys.argv)
    ex = Foo()
    ex.setText("""\
#include <iostream>
using namespace std;

void Function0() {
    cout << "Function0";
}

void Function1() {
    cout << "Function1";
}

void Function2() {
    cout << "Function2";
}

void Function3() {
    cout << "Function3";
}


int main(void) {
    if (1) {
        if (1) {
            if (1) {
                if (1) {
                    int yay;
                }
            }
        }
    }

    if (1) {
        if (1) {
            if (1) {
                if (1) {
                    int yay2;
                }
            }
        }
    }

    return 0;
}\
    """)


    ex.init_test_selections()
    # ex.init_test_selections2()

    ex.resize(800, 600)
    ex.show()
    sys.exit(app.exec_())


if __name__ == "__main__":
    main()

如何实现适用于QScintilla中多项选择的评论功能？

3 个答案: