python - 如何在 QScintilla 小部件内的特定位置显示对话框？

Question

我得到了这段简单的 mcve 代码:

import sys
import re

from PyQt5 import QtGui, QtWidgets, QtCore
from PyQt5.Qsci import QsciScintilla
from PyQt5 import Qsci


class SimpleEditor(QsciScintilla):

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

        font = QtGui.QFont()
        font.setFamily('Courier')
        font.setFixedPitch(True)
        font.setPointSize(10)
        self.setFont(font)
        self.setMarginsFont(font)
        fontmetrics = QtGui.QFontMetrics(font)
        self.setMarginsFont(font)
        self.setMarginWidth(0, fontmetrics.width("00000") + 6)
        self.setMarginLineNumbers(0, True)
        self.setMarginsBackgroundColor(QtGui.QColor("#cccccc"))
        self.setBraceMatching(QsciScintilla.SloppyBraceMatch)
        self.setCaretLineVisible(True)
        self.setCaretLineBackgroundColor(QtGui.QColor("#E8E8FF"))

        if language:
            self.lexer = getattr(Qsci, 'QsciLexer' + language)()
            self.setLexer(self.lexer)

        self.SendScintilla(QsciScintilla.SCI_FOLDALL, True)
        self.setAutoCompletionThreshold(1)
        self.setAutoCompletionSource(QsciScintilla.AcsAPIs)
        self.setFolding(QsciScintilla.BoxedTreeFoldStyle)

        # Signals/Slots
        self.cursorPositionChanged.connect(self.on_cursor_position_changed)
        self.copyAvailable.connect(self.on_copy_available)
        self.indicatorClicked.connect(self.on_indicator_clicked)
        self.indicatorReleased.connect(self.on_indicator_released)
        self.linesChanged.connect(self.on_lines_changed)
        self.marginClicked.connect(self.on_margin_clicked)
        self.modificationAttempted.connect(self.on_modification_attempted)
        self.modificationChanged.connect(self.on_modification_changed)
        self.selectionChanged.connect(self.on_selection_changed)
        self.textChanged.connect(self.on_text_changed)
        self.userListActivated.connect(self.on_user_list_activated)

    def on_cursor_position_changed(self, line, index):
        print("on_cursor_position_changed")

    def on_copy_available(self, yes):
        print('-' * 80)
        print("on_copy_available")

    def on_indicator_clicked(self, line, index, state):
        print("on_indicator_clicked")

    def on_indicator_released(self, line, index, state):
        print("on_indicator_released")

    def on_lines_changed(self):
        print("on_lines_changed")

    def on_margin_clicked(self, margin, line, state):
        print("on_margin_clicked")

    def on_modification_attempted(self):
        print("on_modification_attempted")

    def on_modification_changed(self):
        print("on_modification_changed")

    def on_selection_changed(self):
        print("on_selection_changed")

    def on_text_changed(self):
        print("on_text_changed")

    def on_user_list_activated(self, id, text):
        print("on_user_list_activated")


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)

    ex = QtWidgets.QWidget()
    hlayout = QtWidgets.QHBoxLayout()
    ed = SimpleEditor("JavaScript")

    hlayout.addWidget(ed)

    ed.setText("""#ifdef GL_ES
precision mediump float;
#endif

#extension GL_OES_standard_derivatives : enable

uniform float time;
uniform vec2 mouse;
uniform vec2 resolution;

void main( void ) {

    vec2 st = ( gl_FragCoord.xy / resolution.xy );
    vec2 lefbot = step(vec2(0.1), st);
    float pct = lefbot.x*lefbot.y;
    vec2 rigtop = step(vec2(0.1), 1.-st);
    pct *= rigtop.x*rigtop.y;
    vec3 color = vec3(pct);

    gl_FragColor = vec4( color, 1.0 );""")

    ex.setLayout(hlayout)
    ex.show()
    ex.resize(800, 600)

    sys.exit(app.exec_())

我正在尝试编写与此 site 上提供的解决方案类似的解决方案.如您所见，在该站点上，用户只能通过单击来调整数值，当他们这样做时，会出现一个小对话框，用户将能够实时更改值。

现在，我需要弄清楚的第一件事是当用户单击 QScintilla 小部件时我需要考虑哪些信号(我正在使用这些 docs )。哪个才是我真正应该关心的。

在任何情况下，假设我使用正确的信号弹出包含一些 slider 的对话框，我怎样才能确定我的对话框应该出现的正确位置？

Answer 1

cursorPositionChanged 信号可用于检测鼠标或键盘何时将插入符号移动到数字中的某个位置。然后可以使用正则表达式查找数字在当前行的开始和结束位置。完成后，您可以使用一些低级函数来计算数字的全局位置。

下面的方法使用该方法在相关文本下方显示工具提示:

def on_cursor_position_changed(self, line, index):
    text = self.text(line)
    for match in re.finditer('(?:^|(?<=\W))\d+(?:\.\d+)?(?=$|\W)', text):
        start, end = match.span()
        if start <= index <= end:
            pos = self.positionFromLineIndex(line, start)
            x = self.SendScintilla(
                QsciScintilla.SCI_POINTXFROMPOSITION, 0, pos)
            y = self.SendScintilla(
                QsciScintilla.SCI_POINTYFROMPOSITION, 0, pos)
            point = self.mapToGlobal(QtCore.QPoint(x, y))
            num = float(match.group())
            message = 'number: %s' % num
            break
    else:
        point = QtCore.QPoint(0, 0)
        message = ''
    QtWidgets.QToolTip.showText(point, message)