实现 "Find all" 算法，在 table 中显示匹配的行，并在单击 table 单元格时跳转到该行
Implement a "Find all" algorithm that displays matched lines in a table, and jumps to line when table cell clicked
我想实现能够在 QPlainTextEdit 中搜索查询字符串并在 table 中显示所有匹配行的功能。选择 table 中的一行应将光标移动到文档中的正确行。
下面是一个工作示例，它查找所有匹配项并将它们显示在 table 中。如何获取 plaintextedit 保存的字符串中的选定行号？我可以改为使用 match.capturedEnd() 和 match.capturedStart() 来显示匹配项，但是行号比字符索引匹配更直观。
MWE（相当长的示例文本以供娱乐）
import PySide6.QtCore as qtc
import PySide6.QtGui as qtg
import PySide6.QtWidgets as qtw
class MainWindow(qtw.QWidget):
def __init__(self):
qtw.QWidget.__init__(self)
self.resize(600, 600)
self.setWindowTitle('My Application')
self.fileViewer = qtw.QPlainTextEdit()
self.lineEditQuery = qtw.QLineEdit()
self.tableResults = qtw.QTableWidget()
self.tableResults.setColumnCount(2)
self.tableResults.setHorizontalHeaderLabels(['Line Number', 'Matched Line'])
self.buttonFind = qtw.QPushButton('Find All')
layout = qtw.QVBoxLayout()
layout.addWidget(self.fileViewer)
layout.addWidget(self.lineEditQuery)
layout.addWidget(self.buttonFind)
layout.addWidget(self.tableResults)
self.setLayout(layout)
# Set some properties of QTableWidget
self.tableResults.setSizeAdjustPolicy(qtw.QAbstractScrollArea.AdjustToContents)
self.tableResults.setSelectionBehavior(self.tableResults.SelectRows)
# Insert search query
self.lineEditQuery.setText('simplicity itself')
# Connect button click event
self.buttonFind.clicked.connect(self.findAll)
def findAll(self):
"""Collect matches in dict and pass on the insert method."""
query = qtc.QRegularExpression(self.lineEditQuery.text())
fileContents = self.fileViewer.toPlainText().splitlines()
result = {}
for i, line in enumerate(fileContents):
match = query.match(line)
if match.hasMatch():
result[i] = line
match.capturedEnd()
self.insertMatches(result)
def insertMatches(self, matches):
self.tableResults.setRowCount(len(matches))
rowCounter = 0
for i, line in matches.items():
itemNumber = qtw.QTableWidgetItem(str(i))
itemLine = qtw.QTableWidgetItem(line)
self.tableResults.setItem(rowCounter, 0, itemNumber)
self.tableResults.setItem(rowCounter, 1, itemLine)
rowCounter += 1
self.tableResults.resizeColumnsToContents()
if __name__ == '__main__':
SAMPLE = """
THE ADVENTURES OF SHERLOCK HOLMES
Arthur Conan Doyle
Table of contents
A Scandal in Bohemia
A SCANDAL IN BOHEMIA
Table of contents
Chapter 1
CHAPTER I
To Sherlock Holmes she is always the woman. I have seldom heard him
mention her under any other name. In his eyes she eclipses and
predominates the whole of her sex. It was not that he felt any
emotion akin to love for Irene Adler. All emotions, and that one
particularly, were abhorrent to his cold, precise but admirably
balanced mind. He was, I take it, the most perfect reasoning and
observing machine that the world has seen, but as a lover he would
have placed himself in a false position. He never spoke of the softer
passions, save with a gibe and a sneer. They were admirable things
for the observer--excellent for drawing the veil from men's motives
and actions. But for the trained reasoner to admit such intrusions
into his own delicate and finely adjusted temperament was to
introduce a distracting factor which might throw a doubt upon all his
mental results. Grit in a sensitive instrument, or a crack in one of
his own high-power lenses, would not be more disturbing than a strong
emotion in a nature such as his. And yet there was but one woman to
him, and that woman was the late Irene Adler, of dubious and
questionable memory.
I had seen little of Holmes lately. My marriage had drifted us away
from each other. My own complete happiness, and the home-centred
interests which rise up around the man who first finds himself master
of his own establishment, were sufficient to absorb all my attention,
while Holmes, who loathed every form of society with his whole
Bohemian soul, remained in our lodgings in Baker Street, buried among
his old books, and alternating from week to week between cocaine and
ambition, the drowsiness of the drug, and the fierce energy of his
own keen nature. He was still, as ever, deeply attracted by the study
of crime, and occupied his immense faculties and extraordinary powers
of observation in following out those clues, and clearing up those
mysteries which had been abandoned as hopeless by the official
police. From time to time I heard some vague account of his doings:
of his summons to Odessa in the case of the Trepoff murder, of his
clearing up of the singular tragedy of the Atkinson brothers at
Trincomalee, and finally of the mission which he had accomplished so
delicately and successfully for the reigning family of Holland.
Beyond these signs of his activity, however, which I merely shared
with all the readers of the daily press, I knew little of my former
friend and companion.
One night--it was on the twentieth of March, 1888--I was returning
from a journey to a patient (for I had now returned to civil
practice), when my way led me through Baker Street. As I passed the
well-remembered door, which must always be associated in my mind with
my wooing, and with the dark incidents of the Study in Scarlet, I was
seized with a keen desire to see Holmes again, and to know how he was
employing his extraordinary powers. His rooms were brilliantly lit,
and, even as I looked up, I saw his tall, spare figure pass twice in
a dark silhouette against the blind. He was pacing the room swiftly,
eagerly, with his head sunk upon his chest and his hands clasped
behind him. To me, who knew his every mood and habit, his attitude
and manner told their own story. He was at work again. He had risen
out of his drug-created dreams and was hot upon the scent of some new
problem. I rang the bell and was shown up to the chamber which had
formerly been in part my own.
His manner was not effusive. It seldom was; but he was glad, I think,
to see me. With hardly a word spoken, but with a kindly eye, he waved
me to an armchair, threw across his case of cigars, and indicated a
spirit case and a gasogene in the corner. Then he stood before the
fire and looked me over in his singular introspective fashion.
"Wedlock suits you," he remarked. "I think, Watson, that you have put
on seven and a half pounds since I saw you."
"Seven!" I answered.
"Indeed, I should have thought a little more. Just a trifle more, I
fancy, Watson. And in practice again, I observe. You did not tell me
that you intended to go into harness."
"Then, how do you know?"
"I see it, I deduce it. How do I know that you have been getting
yourself very wet lately, and that you have a most clumsy and
careless servant girl?"
"My dear Holmes," said I, "this is too much. You would certainly have
been burned, had you lived a few centuries ago. It is true that I had
a country walk on Thursday and came home in a dreadful mess, but as I
have changed my clothes I can't imagine how you deduce it. As to Mary
Jane, she is incorrigible, and my wife has given her notice, but
there, again, I fail to see how you work it out."
He chuckled to himself and rubbed his long, nervous hands together.
"It is simplicity itself," said he; "my eyes tell me that on the
inside of your left shoe, just where the firelight strikes it, the
leather is scored by six almost parallel cuts. Obviously they have
been caused by someone who has very carelessly scraped round the
edges of the sole in order to remove crusted mud from it. Hence, you
see, my double deduction that you had been out in vile weather, and
that you had a particularly malignant boot-slitting specimen of the
London slavey. As to your practice, if a gentleman walks into my
rooms smelling of iodoform, with a black mark of nitrate of silver
upon his right forefinger, and a bulge on the right side of his
top-hat to show where he has secreted his stethoscope, I must be
dull, indeed, if I do not pronounce him to be an active member of the
medical profession."
I could not help laughing at the ease with which he explained his
process of deduction. "When I hear you give your reasons," I
remarked, "the thing always appears to me to be so ridiculously
simple that I could easily do it myself, though at each successive
instance of your reasoning I am baffled until you explain your
process. And yet I believe that my eyes are as good as yours."
"Quite so," he answered, lighting a cigarette, and throwing himself
down into an armchair. "You see, but you do not observe. The
distinction is clear. For example, you have frequently seen the steps
which lead up from the hall to this room."
"Frequently."
"How often?"
"Well, some hundreds of times."
"Then how many are there?"
"How many? I don't know."
"Quite so! You have not observed. And yet you have seen. That is just
my point. Now, I know that there are seventeen steps, because I have
both seen and observed. By-the-way, since you are interested in these
little problems, and since you are good enough to chronicle one or
two of my trifling experiences, you may be interested in this." He
threw over a sheet of thick, pink-tinted note-paper which had been
lying open upon the table. "It came by the last post," said he. "Read
it aloud."
The note was undated, and without either signature or address.
"There will call upon you to-night, at a quarter to eight o'clock,"
it said, "a gentleman who desires to consult you upon a matter of the
very deepest moment. Your recent services to one of the royal houses
of Europe have shown that you are one who may safely be trusted with
matters which are of an importance which can hardly be exaggerated.
This account of you we have from all quarters received. Be in your
chamber then at that hour, and do not take it amiss if your visitor
wear a mask."
"This is indeed a mystery," I remarked. "What do you imagine that it
means?"
"I have no data yet. It is a capital mistake to theorize before one
has data. Insensibly one begins to twist facts to suit theories,
instead of theories to suit facts. But the note itself. What do you
deduce from it?"
I carefully examined the writing, and the paper upon which it was
written.
"The man who wrote it was presumably well to do," I remarked,
endeavouring to imitate my companion's processes. "Such paper could
not be bought under half a crown a packet. It is peculiarly strong
and stiff."
"Peculiar--that is the very word," said Holmes. "It is not an English
paper at all. Hold it up to the light."
I did so, and saw a large "E" with a small "g," a "P," and a large
"G" with a small "t" woven into the texture of the paper.
"What do you make of that?" asked Holmes.
"The name of the maker, no doubt; or his monogram, rather."
"Not at all. The 'G' with the small 't' stands for 'Gesellschaft,'
which is the German for 'Company.' It is a customary contraction like
our 'Co.' 'P,' of course, stands for 'Papier.' Now for the 'Eg.' Let
us glance at our Continental Gazetteer." He took down a heavy brown
volume from his shelves. "Eglow, Eglonitz--here we are, Egria. It is
in a German-speaking country--in Bohemia, not far from Carlsbad.
'Remarkable as being the scene of the death of Wallenstein, and for
its numerous glass-factories and paper-mills.' Ha, ha, my boy, what
do you make of that?" His eyes sparkled, and he sent up a great blue
triumphant cloud from his cigarette.
"The paper was made in Bohemia," I said.
"Precisely. And the man who wrote the note is a German. Do you note
the peculiar construction of the sentence--'This account of you we
have from all quarters received.' A Frenchman or Russian could not
have written that. It is the German who is so uncourteous to his
verbs. It only remains, therefore, to discover what is wanted by this
German who writes upon Bohemian paper and prefers wearing a mask to
showing his face. And here he comes, if I am not mistaken, to resolve
all our doubts."
As he spoke there was the sharp sound of horses' hoofs and grating
wheels against the curb, followed by a sharp pull at the bell. Holmes
whistled.
"A pair, by the sound," said he. "Yes," he continued, glancing out of
the window. "A nice little brougham and a pair of beauties. A hundred
and fifty guineas apiece. There's money in this case, Watson, if
there is nothing else."
"I think that I had better go, Holmes."
"Not a bit, Doctor. Stay where you are. I am lost without my Boswell.
And this promises to be interesting. It would be a pity to miss it."
"But your client--"
"Never mind him. I may want your help, and so may he. Here he comes.
Sit down in that armchair, Doctor, and give us your best attention."
A slow and heavy step, which had been heard upon the stairs and in
the passage, paused immediately outside the door. Then there was a
loud and authoritative tap.
"Come in!" said Holmes.
A man entered who could hardly have been less than six feet six
inches in height, with the chest and limbs of a Hercules. His dress
was rich with a richness which would, in England, be looked upon as
akin to bad taste. Heavy bands of astrakhan were slashed across the
sleeves and fronts of his double-breasted coat, while the deep blue
cloak which was thrown over his shoulders was lined with
flame-coloured silk and secured at the neck with a brooch which
consisted of a single flaming beryl. Boots which extended halfway up
his calves, and which were trimmed at the tops with rich brown fur,
completed the impression of barbaric opulence which was suggested by
his whole appearance. He carried a broad-brimmed hat in his hand,
while he wore across the upper part of his face, extending down past
the cheekbones, a black vizard mask, which he had apparently adjusted
that very moment, for his hand was still raised to it as he entered.
From the lower part of the face he appeared to be a man of strong
character, with a thick, hanging lip, and a long, straight chin
suggestive of resolution pushed to the length of obstinacy.
"You had my note?" he asked with a deep harsh voice and a strongly
marked German accent. "I told you that I would call." He looked from
one to the other of us, as if uncertain which to address.
"Pray take a seat," said Holmes. "This is my friend and colleague,
Dr. Watson, who is occasionally good enough to help me in my cases.
Whom have I the honour to address?"
"You may address me as the Count Von Kramm, a Bohemian nobleman. I
understand that this gentleman, your friend, is a man of honour and
discretion, whom I may trust with a matter of the most extreme
importance. If not, I should much prefer to communicate with you
alone."
I rose to go, but Holmes caught me by the wrist and pushed me back
into my chair. "It is both, or none," said he. "You may say before
this gentleman anything which you may say to me."
The Count shrugged his broad shoulders. "Then I must begin," said he,
"by binding you both to absolute secrecy for two years; at the end of
that time the matter will be of no importance. At present it is not
too much to say that it is of such weight it may have an influence
upon European history."
"I promise," said Holmes.
"And I."
"You will excuse this mask," continued our strange visitor. "The
august person who employs me wishes his agent to be unknown to you,
and I may confess at once that the title by which I have just called
myself is not exactly my own."
"I was aware of it," said Holmes dryly.
"The circumstances are of great delicacy, and every precaution has to
be taken to quench what might grow to be an immense scandal and
seriously compromise one of the reigning families of Europe. To speak
plainly, the matter implicates the great House of Ormstein,
hereditary kings of Bohemia."
"I was also aware of that," murmured Holmes, settling himself down in
his armchair and closing his eyes.
Our visitor glanced with some apparent surprise at the languid,
lounging figure of the man who had been no doubt depicted to him as
the most incisive reasoner and most energetic agent in Europe. Holmes
slowly reopened his eyes and looked impatiently at his gigantic
client.
"If your Majesty would condescend to state your case," he remarked,
"I should be better able to advise you."
The man sprang from his chair and paced up and down the room in
uncontrollable agitation. Then, with a gesture of desperation, he
tore the mask from his face and hurled it upon the ground. "You are
right," he cried; "I am the King. Why should I attempt to conceal
it?"
"Why, indeed?" murmured Holmes. "Your Majesty had not spoken before I
was aware that I was addressing Wilhelm Gottsreich Sigismond von
Ormstein, Grand Duke of Cassel-Felstein, and hereditary King of
Bohemia."
"But you can understand," said our strange visitor, sitting down once
more and passing his hand over his high white forehead, "you can
understand that I am not accustomed to doing such business in my own
person. Yet the matter was so delicate that I could not confide it to
an agent without putting myself in his power. I have come incognito
from Prague for the purpose of consulting you."
"Then, pray consult," said Holmes, shutting his eyes once more.
"The facts are briefly these: Some five years ago, during a lengthy
visit to Warsaw, I made the acquaintance of the well-known
adventuress, Irene Adler. The name is no doubt familiar to you."
"Kindly look her up in my index, Doctor," murmured Holmes without
opening his eyes. For many years he had adopted a system of docketing
all paragraphs concerning men and things, so that it was difficult to
name a subject or a person on which he could not at once furnish
information. In this case I found her biography sandwiched in between
that of a Hebrew rabbi and that of a staff-commander who had written
a monograph upon the deep-sea fishes.
"Let me see!" said Holmes. "Hum! Born in New Jersey in the year 1858.
Contralto--hum! La Scala, hum! Prima donna Imperial Opera of
Warsaw--yes! Retired from operatic stage--ha! Living in London--quite
so! Your Majesty, as I understand, became entangled with this young
person, wrote her some compromising letters, and is now desirous of
getting those letters back."
"Precisely so. But how--"
"Was there a secret marriage?"
"None."
"No legal papers or certificates?"
"None."
"Then I fail to follow your Majesty. If this young person should
produce her letters for blackmailing or other purposes, how is she to
prove their authenticity?"
"There is the writing."
"Pooh, pooh! Forgery."
"My private note-paper."
"Stolen."
"My own seal."
"Imitated."
"My photograph."
"Bought."
"We were both in the photograph."
"Oh, dear! That is very bad! Your Majesty has indeed committed an
indiscretion."
"I was mad--insane."
"You have compromised yourself seriously."
"I was only Crown Prince then. I was young. I am but thirty now."
"It must be recovered."
"We have tried and failed."
"Your Majesty must pay. It must be bought."
"She will not sell."
"Stolen, then."
"Five attempts have been made. Twice burglars in my pay ransacked her
house. Once we diverted her luggage when she travelled. Twice she has
been waylaid. There has been no result."
"No sign of it?"
"Absolutely none."
Holmes laughed. "It is quite a pretty little problem," said he.
"But a very serious one to me," returned the King reproachfully.
"Very, indeed. And what does she propose to do with the photograph?"
"To ruin me."
"But how?"
"I am about to be married."
"So I have heard."
"To Clotilde Lothman von Saxe-Meningen, second daughter of the King
of Scandinavia. You may know the strict principles of her family. She
is herself the very soul of delicacy. A shadow of a doubt as to my
conduct would bring the matter to an end."
"And Irene Adler?"
"Threatens to send them the photograph. And she will do it. I know
that she will do it. You do not know her, but she has a soul of
steel. She has the face of the most beautiful of women, and the mind
of the most resolute of men. Rather than I should marry another
woman, there are no lengths to which she would not go--none."
"You are sure that she has not sent it yet?"
"I am sure."
"And why?"
"Because she has said that she would send it on the day when the
betrothal was publicly proclaimed. That will be next Monday."
"Oh, then we have three days yet," said Holmes with a yawn. "That is
very fortunate, as I have one or two matters of importance to look
into just at present. Your Majesty will, of course, stay in London
for the present?"
"Certainly. You will find me at the Langham under the name of the
Count Von Kramm."
"Then I shall drop you a line to let you know how we progress."
"Pray do so. I shall be all anxiety."
"Then, as to money?"
"You have carte blanche."
"Absolutely?"
"I tell you that I would give one of the provinces of my kingdom to
have that photograph."
"And for present expenses?"
The King took a heavy chamois leather bag from under his cloak and
laid it on the table.
"There are three hundred pounds in gold and seven hundred in notes,"
he said.
Holmes scribbled a receipt upon a sheet of his note-book and handed
it to him.
"And Mademoiselle's address?" he asked.
"Is Briony Lodge, Serpentine Avenue, St. John's Wood."
Holmes took a note of it. "One other question," said he. "Was the
photograph a cabinet?"
"It was."
"Then, good-night, your Majesty, and I trust that we shall soon have
some good news for you. And good-night, Watson," he added, as the
wheels of the royal brougham rolled down the street. "If you will be
good enough to call to-morrow afternoon at three o'clock I should
like to chat this little matter over with you."
----------
This text is provided to you "as-is" without any warranty. No
warranties of any kind, expressed or implied, are made to you as to
the text or any medium it may be on, including but not limited to
warranties of merchantablity or fitness for a particular purpose.
This text was formatted from various free ASCII and HTML variants.
See http://sherlock-holm.es for an electronic form of this text and
additional information about it.
This text comes from the collection's version 3.1.
"""
app = qtw.QApplication([])
mw = MainWindow()
mw.fileViewer.insertPlainText(SAMPLE)
mw.buttonFind.clicked.emit()
mw.show()
app.exec_()
为了将光标移动到指定位置，需要使用底层QTextDocument using document()。
通过 findBlockByLineNumber you can construct a QTextCursor and use setTextCursor() 将该光标（包括实际插入符号位置）“应用”到纯文本。
def goToLine(self, line):
block = self.fileViewer.document().findBlockByLineNumber(line)
self.fileViewer.setTextCursor(qtg.QTextCursor(block))
self.fileViewer.setFocus()
由于无论如何您都将使用 QTextDocument 和 QTextCursor，我建议您避免逐行搜索，因为 QTextDocument 已经通过 find():
提供了一个更兼容和可扩展的接口
class MainWindow(qtw.QWidget):
def __init__(self):
# ...
self.tableResults.itemClicked.connect(self.goToLine)
def findAll(self):
self.tableResults.setRowCount(0)
query = qtc.QRegularExpression(self.lineEditQuery.text())
doc = self.fileViewer.document()
cursor = qtg.QTextCursor(doc)
rowCounter = 0
while True:
cursor = doc.find(query, cursor)
if cursor.isNull():
break
self.tableResults.insertRow(rowCounter)
block = cursor.block()
itemNumber = qtw.QTableWidgetItem()
# set the data as integer, not as string; you cannot do that using
# QTableWidgetItem constructor
itemNumber.setData(qtc.Qt.DisplayRole, block.firstLineNumber())
itemLine = qtw.QTableWidgetItem(block.text())
self.tableResults.setItem(rowCounter, 0, itemNumber)
self.tableResults.setItem(rowCounter, 1, itemLine)
rowCounter += 1
self.tableResults.resizeColumnsToContents()
def goToLine(self, item):
line = self.tableResults.model().index(item.row(), 0).data()
block = self.fileViewer.document().findBlockByLineNumber(line)
self.fileViewer.setTextCursor(qtg.QTextCursor(block))
self.fileViewer.setFocus()
虽然使用起来有点困难，但使用 QTextCursor 接口有很多好处。例如，您可以将匹配的光标（包括找到的文本的选择）设置为项目数据，并将 that 光标设置为纯文本；结果是您不仅会获得正确的位置，而且还会自动选择匹配的文本：
def findAll(self):
# ...
itemNumber = qtw.QTableWidgetItem()
itemNumber.setData(qtc.Qt.DisplayRole, block.firstLineNumber())
# since the cursor is being reused for the search, you must
# construct a *new* instance based on it
<b>itemNumber.setData(qtc.Qt.UserRole, qtg.QTextCursor(cursor))</b>
# ...
def goToLine(self, item):
index = self.tableResults.model().index(item.row(), 0)
cursor = index.data(qtc.Qt.UserRole)
self.fileViewer.setTextCursor(cursor)
self.fileViewer.setFocus()
注意：您应该使用 self.tableResults.setEditTriggers(self.tableResults.NoEditTriggers) 以避免在 table
中编辑项目
我想实现能够在 QPlainTextEdit 中搜索查询字符串并在 table 中显示所有匹配行的功能。选择 table 中的一行应将光标移动到文档中的正确行。
下面是一个工作示例，它查找所有匹配项并将它们显示在 table 中。如何获取 plaintextedit 保存的字符串中的选定行号？我可以改为使用 match.capturedEnd() 和 match.capturedStart() 来显示匹配项，但是行号比字符索引匹配更直观。
MWE（相当长的示例文本以供娱乐）
import PySide6.QtCore as qtc
import PySide6.QtGui as qtg
import PySide6.QtWidgets as qtw
class MainWindow(qtw.QWidget):
def __init__(self):
qtw.QWidget.__init__(self)
self.resize(600, 600)
self.setWindowTitle('My Application')
self.fileViewer = qtw.QPlainTextEdit()
self.lineEditQuery = qtw.QLineEdit()
self.tableResults = qtw.QTableWidget()
self.tableResults.setColumnCount(2)
self.tableResults.setHorizontalHeaderLabels(['Line Number', 'Matched Line'])
self.buttonFind = qtw.QPushButton('Find All')
layout = qtw.QVBoxLayout()
layout.addWidget(self.fileViewer)
layout.addWidget(self.lineEditQuery)
layout.addWidget(self.buttonFind)
layout.addWidget(self.tableResults)
self.setLayout(layout)
# Set some properties of QTableWidget
self.tableResults.setSizeAdjustPolicy(qtw.QAbstractScrollArea.AdjustToContents)
self.tableResults.setSelectionBehavior(self.tableResults.SelectRows)
# Insert search query
self.lineEditQuery.setText('simplicity itself')
# Connect button click event
self.buttonFind.clicked.connect(self.findAll)
def findAll(self):
"""Collect matches in dict and pass on the insert method."""
query = qtc.QRegularExpression(self.lineEditQuery.text())
fileContents = self.fileViewer.toPlainText().splitlines()
result = {}
for i, line in enumerate(fileContents):
match = query.match(line)
if match.hasMatch():
result[i] = line
match.capturedEnd()
self.insertMatches(result)
def insertMatches(self, matches):
self.tableResults.setRowCount(len(matches))
rowCounter = 0
for i, line in matches.items():
itemNumber = qtw.QTableWidgetItem(str(i))
itemLine = qtw.QTableWidgetItem(line)
self.tableResults.setItem(rowCounter, 0, itemNumber)
self.tableResults.setItem(rowCounter, 1, itemLine)
rowCounter += 1
self.tableResults.resizeColumnsToContents()
if __name__ == '__main__':
SAMPLE = """
THE ADVENTURES OF SHERLOCK HOLMES
Arthur Conan Doyle
Table of contents
A Scandal in Bohemia
A SCANDAL IN BOHEMIA
Table of contents
Chapter 1
CHAPTER I
To Sherlock Holmes she is always the woman. I have seldom heard him
mention her under any other name. In his eyes she eclipses and
predominates the whole of her sex. It was not that he felt any
emotion akin to love for Irene Adler. All emotions, and that one
particularly, were abhorrent to his cold, precise but admirably
balanced mind. He was, I take it, the most perfect reasoning and
observing machine that the world has seen, but as a lover he would
have placed himself in a false position. He never spoke of the softer
passions, save with a gibe and a sneer. They were admirable things
for the observer--excellent for drawing the veil from men's motives
and actions. But for the trained reasoner to admit such intrusions
into his own delicate and finely adjusted temperament was to
introduce a distracting factor which might throw a doubt upon all his
mental results. Grit in a sensitive instrument, or a crack in one of
his own high-power lenses, would not be more disturbing than a strong
emotion in a nature such as his. And yet there was but one woman to
him, and that woman was the late Irene Adler, of dubious and
questionable memory.
I had seen little of Holmes lately. My marriage had drifted us away
from each other. My own complete happiness, and the home-centred
interests which rise up around the man who first finds himself master
of his own establishment, were sufficient to absorb all my attention,
while Holmes, who loathed every form of society with his whole
Bohemian soul, remained in our lodgings in Baker Street, buried among
his old books, and alternating from week to week between cocaine and
ambition, the drowsiness of the drug, and the fierce energy of his
own keen nature. He was still, as ever, deeply attracted by the study
of crime, and occupied his immense faculties and extraordinary powers
of observation in following out those clues, and clearing up those
mysteries which had been abandoned as hopeless by the official
police. From time to time I heard some vague account of his doings:
of his summons to Odessa in the case of the Trepoff murder, of his
clearing up of the singular tragedy of the Atkinson brothers at
Trincomalee, and finally of the mission which he had accomplished so
delicately and successfully for the reigning family of Holland.
Beyond these signs of his activity, however, which I merely shared
with all the readers of the daily press, I knew little of my former
friend and companion.
One night--it was on the twentieth of March, 1888--I was returning
from a journey to a patient (for I had now returned to civil
practice), when my way led me through Baker Street. As I passed the
well-remembered door, which must always be associated in my mind with
my wooing, and with the dark incidents of the Study in Scarlet, I was
seized with a keen desire to see Holmes again, and to know how he was
employing his extraordinary powers. His rooms were brilliantly lit,
and, even as I looked up, I saw his tall, spare figure pass twice in
a dark silhouette against the blind. He was pacing the room swiftly,
eagerly, with his head sunk upon his chest and his hands clasped
behind him. To me, who knew his every mood and habit, his attitude
and manner told their own story. He was at work again. He had risen
out of his drug-created dreams and was hot upon the scent of some new
problem. I rang the bell and was shown up to the chamber which had
formerly been in part my own.
His manner was not effusive. It seldom was; but he was glad, I think,
to see me. With hardly a word spoken, but with a kindly eye, he waved
me to an armchair, threw across his case of cigars, and indicated a
spirit case and a gasogene in the corner. Then he stood before the
fire and looked me over in his singular introspective fashion.
"Wedlock suits you," he remarked. "I think, Watson, that you have put
on seven and a half pounds since I saw you."
"Seven!" I answered.
"Indeed, I should have thought a little more. Just a trifle more, I
fancy, Watson. And in practice again, I observe. You did not tell me
that you intended to go into harness."
"Then, how do you know?"
"I see it, I deduce it. How do I know that you have been getting
yourself very wet lately, and that you have a most clumsy and
careless servant girl?"
"My dear Holmes," said I, "this is too much. You would certainly have
been burned, had you lived a few centuries ago. It is true that I had
a country walk on Thursday and came home in a dreadful mess, but as I
have changed my clothes I can't imagine how you deduce it. As to Mary
Jane, she is incorrigible, and my wife has given her notice, but
there, again, I fail to see how you work it out."
He chuckled to himself and rubbed his long, nervous hands together.
"It is simplicity itself," said he; "my eyes tell me that on the
inside of your left shoe, just where the firelight strikes it, the
leather is scored by six almost parallel cuts. Obviously they have
been caused by someone who has very carelessly scraped round the
edges of the sole in order to remove crusted mud from it. Hence, you
see, my double deduction that you had been out in vile weather, and
that you had a particularly malignant boot-slitting specimen of the
London slavey. As to your practice, if a gentleman walks into my
rooms smelling of iodoform, with a black mark of nitrate of silver
upon his right forefinger, and a bulge on the right side of his
top-hat to show where he has secreted his stethoscope, I must be
dull, indeed, if I do not pronounce him to be an active member of the
medical profession."
I could not help laughing at the ease with which he explained his
process of deduction. "When I hear you give your reasons," I
remarked, "the thing always appears to me to be so ridiculously
simple that I could easily do it myself, though at each successive
instance of your reasoning I am baffled until you explain your
process. And yet I believe that my eyes are as good as yours."
"Quite so," he answered, lighting a cigarette, and throwing himself
down into an armchair. "You see, but you do not observe. The
distinction is clear. For example, you have frequently seen the steps
which lead up from the hall to this room."
"Frequently."
"How often?"
"Well, some hundreds of times."
"Then how many are there?"
"How many? I don't know."
"Quite so! You have not observed. And yet you have seen. That is just
my point. Now, I know that there are seventeen steps, because I have
both seen and observed. By-the-way, since you are interested in these
little problems, and since you are good enough to chronicle one or
two of my trifling experiences, you may be interested in this." He
threw over a sheet of thick, pink-tinted note-paper which had been
lying open upon the table. "It came by the last post," said he. "Read
it aloud."
The note was undated, and without either signature or address.
"There will call upon you to-night, at a quarter to eight o'clock,"
it said, "a gentleman who desires to consult you upon a matter of the
very deepest moment. Your recent services to one of the royal houses
of Europe have shown that you are one who may safely be trusted with
matters which are of an importance which can hardly be exaggerated.
This account of you we have from all quarters received. Be in your
chamber then at that hour, and do not take it amiss if your visitor
wear a mask."
"This is indeed a mystery," I remarked. "What do you imagine that it
means?"
"I have no data yet. It is a capital mistake to theorize before one
has data. Insensibly one begins to twist facts to suit theories,
instead of theories to suit facts. But the note itself. What do you
deduce from it?"
I carefully examined the writing, and the paper upon which it was
written.
"The man who wrote it was presumably well to do," I remarked,
endeavouring to imitate my companion's processes. "Such paper could
not be bought under half a crown a packet. It is peculiarly strong
and stiff."
"Peculiar--that is the very word," said Holmes. "It is not an English
paper at all. Hold it up to the light."
I did so, and saw a large "E" with a small "g," a "P," and a large
"G" with a small "t" woven into the texture of the paper.
"What do you make of that?" asked Holmes.
"The name of the maker, no doubt; or his monogram, rather."
"Not at all. The 'G' with the small 't' stands for 'Gesellschaft,'
which is the German for 'Company.' It is a customary contraction like
our 'Co.' 'P,' of course, stands for 'Papier.' Now for the 'Eg.' Let
us glance at our Continental Gazetteer." He took down a heavy brown
volume from his shelves. "Eglow, Eglonitz--here we are, Egria. It is
in a German-speaking country--in Bohemia, not far from Carlsbad.
'Remarkable as being the scene of the death of Wallenstein, and for
its numerous glass-factories and paper-mills.' Ha, ha, my boy, what
do you make of that?" His eyes sparkled, and he sent up a great blue
triumphant cloud from his cigarette.
"The paper was made in Bohemia," I said.
"Precisely. And the man who wrote the note is a German. Do you note
the peculiar construction of the sentence--'This account of you we
have from all quarters received.' A Frenchman or Russian could not
have written that. It is the German who is so uncourteous to his
verbs. It only remains, therefore, to discover what is wanted by this
German who writes upon Bohemian paper and prefers wearing a mask to
showing his face. And here he comes, if I am not mistaken, to resolve
all our doubts."
As he spoke there was the sharp sound of horses' hoofs and grating
wheels against the curb, followed by a sharp pull at the bell. Holmes
whistled.
"A pair, by the sound," said he. "Yes," he continued, glancing out of
the window. "A nice little brougham and a pair of beauties. A hundred
and fifty guineas apiece. There's money in this case, Watson, if
there is nothing else."
"I think that I had better go, Holmes."
"Not a bit, Doctor. Stay where you are. I am lost without my Boswell.
And this promises to be interesting. It would be a pity to miss it."
"But your client--"
"Never mind him. I may want your help, and so may he. Here he comes.
Sit down in that armchair, Doctor, and give us your best attention."
A slow and heavy step, which had been heard upon the stairs and in
the passage, paused immediately outside the door. Then there was a
loud and authoritative tap.
"Come in!" said Holmes.
A man entered who could hardly have been less than six feet six
inches in height, with the chest and limbs of a Hercules. His dress
was rich with a richness which would, in England, be looked upon as
akin to bad taste. Heavy bands of astrakhan were slashed across the
sleeves and fronts of his double-breasted coat, while the deep blue
cloak which was thrown over his shoulders was lined with
flame-coloured silk and secured at the neck with a brooch which
consisted of a single flaming beryl. Boots which extended halfway up
his calves, and which were trimmed at the tops with rich brown fur,
completed the impression of barbaric opulence which was suggested by
his whole appearance. He carried a broad-brimmed hat in his hand,
while he wore across the upper part of his face, extending down past
the cheekbones, a black vizard mask, which he had apparently adjusted
that very moment, for his hand was still raised to it as he entered.
From the lower part of the face he appeared to be a man of strong
character, with a thick, hanging lip, and a long, straight chin
suggestive of resolution pushed to the length of obstinacy.
"You had my note?" he asked with a deep harsh voice and a strongly
marked German accent. "I told you that I would call." He looked from
one to the other of us, as if uncertain which to address.
"Pray take a seat," said Holmes. "This is my friend and colleague,
Dr. Watson, who is occasionally good enough to help me in my cases.
Whom have I the honour to address?"
"You may address me as the Count Von Kramm, a Bohemian nobleman. I
understand that this gentleman, your friend, is a man of honour and
discretion, whom I may trust with a matter of the most extreme
importance. If not, I should much prefer to communicate with you
alone."
I rose to go, but Holmes caught me by the wrist and pushed me back
into my chair. "It is both, or none," said he. "You may say before
this gentleman anything which you may say to me."
The Count shrugged his broad shoulders. "Then I must begin," said he,
"by binding you both to absolute secrecy for two years; at the end of
that time the matter will be of no importance. At present it is not
too much to say that it is of such weight it may have an influence
upon European history."
"I promise," said Holmes.
"And I."
"You will excuse this mask," continued our strange visitor. "The
august person who employs me wishes his agent to be unknown to you,
and I may confess at once that the title by which I have just called
myself is not exactly my own."
"I was aware of it," said Holmes dryly.
"The circumstances are of great delicacy, and every precaution has to
be taken to quench what might grow to be an immense scandal and
seriously compromise one of the reigning families of Europe. To speak
plainly, the matter implicates the great House of Ormstein,
hereditary kings of Bohemia."
"I was also aware of that," murmured Holmes, settling himself down in
his armchair and closing his eyes.
Our visitor glanced with some apparent surprise at the languid,
lounging figure of the man who had been no doubt depicted to him as
the most incisive reasoner and most energetic agent in Europe. Holmes
slowly reopened his eyes and looked impatiently at his gigantic
client.
"If your Majesty would condescend to state your case," he remarked,
"I should be better able to advise you."
The man sprang from his chair and paced up and down the room in
uncontrollable agitation. Then, with a gesture of desperation, he
tore the mask from his face and hurled it upon the ground. "You are
right," he cried; "I am the King. Why should I attempt to conceal
it?"
"Why, indeed?" murmured Holmes. "Your Majesty had not spoken before I
was aware that I was addressing Wilhelm Gottsreich Sigismond von
Ormstein, Grand Duke of Cassel-Felstein, and hereditary King of
Bohemia."
"But you can understand," said our strange visitor, sitting down once
more and passing his hand over his high white forehead, "you can
understand that I am not accustomed to doing such business in my own
person. Yet the matter was so delicate that I could not confide it to
an agent without putting myself in his power. I have come incognito
from Prague for the purpose of consulting you."
"Then, pray consult," said Holmes, shutting his eyes once more.
"The facts are briefly these: Some five years ago, during a lengthy
visit to Warsaw, I made the acquaintance of the well-known
adventuress, Irene Adler. The name is no doubt familiar to you."
"Kindly look her up in my index, Doctor," murmured Holmes without
opening his eyes. For many years he had adopted a system of docketing
all paragraphs concerning men and things, so that it was difficult to
name a subject or a person on which he could not at once furnish
information. In this case I found her biography sandwiched in between
that of a Hebrew rabbi and that of a staff-commander who had written
a monograph upon the deep-sea fishes.
"Let me see!" said Holmes. "Hum! Born in New Jersey in the year 1858.
Contralto--hum! La Scala, hum! Prima donna Imperial Opera of
Warsaw--yes! Retired from operatic stage--ha! Living in London--quite
so! Your Majesty, as I understand, became entangled with this young
person, wrote her some compromising letters, and is now desirous of
getting those letters back."
"Precisely so. But how--"
"Was there a secret marriage?"
"None."
"No legal papers or certificates?"
"None."
"Then I fail to follow your Majesty. If this young person should
produce her letters for blackmailing or other purposes, how is she to
prove their authenticity?"
"There is the writing."
"Pooh, pooh! Forgery."
"My private note-paper."
"Stolen."
"My own seal."
"Imitated."
"My photograph."
"Bought."
"We were both in the photograph."
"Oh, dear! That is very bad! Your Majesty has indeed committed an
indiscretion."
"I was mad--insane."
"You have compromised yourself seriously."
"I was only Crown Prince then. I was young. I am but thirty now."
"It must be recovered."
"We have tried and failed."
"Your Majesty must pay. It must be bought."
"She will not sell."
"Stolen, then."
"Five attempts have been made. Twice burglars in my pay ransacked her
house. Once we diverted her luggage when she travelled. Twice she has
been waylaid. There has been no result."
"No sign of it?"
"Absolutely none."
Holmes laughed. "It is quite a pretty little problem," said he.
"But a very serious one to me," returned the King reproachfully.
"Very, indeed. And what does she propose to do with the photograph?"
"To ruin me."
"But how?"
"I am about to be married."
"So I have heard."
"To Clotilde Lothman von Saxe-Meningen, second daughter of the King
of Scandinavia. You may know the strict principles of her family. She
is herself the very soul of delicacy. A shadow of a doubt as to my
conduct would bring the matter to an end."
"And Irene Adler?"
"Threatens to send them the photograph. And she will do it. I know
that she will do it. You do not know her, but she has a soul of
steel. She has the face of the most beautiful of women, and the mind
of the most resolute of men. Rather than I should marry another
woman, there are no lengths to which she would not go--none."
"You are sure that she has not sent it yet?"
"I am sure."
"And why?"
"Because she has said that she would send it on the day when the
betrothal was publicly proclaimed. That will be next Monday."
"Oh, then we have three days yet," said Holmes with a yawn. "That is
very fortunate, as I have one or two matters of importance to look
into just at present. Your Majesty will, of course, stay in London
for the present?"
"Certainly. You will find me at the Langham under the name of the
Count Von Kramm."
"Then I shall drop you a line to let you know how we progress."
"Pray do so. I shall be all anxiety."
"Then, as to money?"
"You have carte blanche."
"Absolutely?"
"I tell you that I would give one of the provinces of my kingdom to
have that photograph."
"And for present expenses?"
The King took a heavy chamois leather bag from under his cloak and
laid it on the table.
"There are three hundred pounds in gold and seven hundred in notes,"
he said.
Holmes scribbled a receipt upon a sheet of his note-book and handed
it to him.
"And Mademoiselle's address?" he asked.
"Is Briony Lodge, Serpentine Avenue, St. John's Wood."
Holmes took a note of it. "One other question," said he. "Was the
photograph a cabinet?"
"It was."
"Then, good-night, your Majesty, and I trust that we shall soon have
some good news for you. And good-night, Watson," he added, as the
wheels of the royal brougham rolled down the street. "If you will be
good enough to call to-morrow afternoon at three o'clock I should
like to chat this little matter over with you."
----------
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"""
app = qtw.QApplication([])
mw = MainWindow()
mw.fileViewer.insertPlainText(SAMPLE)
mw.buttonFind.clicked.emit()
mw.show()
app.exec_()
为了将光标移动到指定位置，需要使用底层QTextDocument using document()。
通过 findBlockByLineNumber you can construct a QTextCursor and use setTextCursor() 将该光标（包括实际插入符号位置）“应用”到纯文本。
def goToLine(self, line):
block = self.fileViewer.document().findBlockByLineNumber(line)
self.fileViewer.setTextCursor(qtg.QTextCursor(block))
self.fileViewer.setFocus()
由于无论如何您都将使用 QTextDocument 和 QTextCursor，我建议您避免逐行搜索，因为 QTextDocument 已经通过 find():
class MainWindow(qtw.QWidget):
def __init__(self):
# ...
self.tableResults.itemClicked.connect(self.goToLine)
def findAll(self):
self.tableResults.setRowCount(0)
query = qtc.QRegularExpression(self.lineEditQuery.text())
doc = self.fileViewer.document()
cursor = qtg.QTextCursor(doc)
rowCounter = 0
while True:
cursor = doc.find(query, cursor)
if cursor.isNull():
break
self.tableResults.insertRow(rowCounter)
block = cursor.block()
itemNumber = qtw.QTableWidgetItem()
# set the data as integer, not as string; you cannot do that using
# QTableWidgetItem constructor
itemNumber.setData(qtc.Qt.DisplayRole, block.firstLineNumber())
itemLine = qtw.QTableWidgetItem(block.text())
self.tableResults.setItem(rowCounter, 0, itemNumber)
self.tableResults.setItem(rowCounter, 1, itemLine)
rowCounter += 1
self.tableResults.resizeColumnsToContents()
def goToLine(self, item):
line = self.tableResults.model().index(item.row(), 0).data()
block = self.fileViewer.document().findBlockByLineNumber(line)
self.fileViewer.setTextCursor(qtg.QTextCursor(block))
self.fileViewer.setFocus()
虽然使用起来有点困难，但使用 QTextCursor 接口有很多好处。例如，您可以将匹配的光标（包括找到的文本的选择）设置为项目数据，并将 that 光标设置为纯文本；结果是您不仅会获得正确的位置，而且还会自动选择匹配的文本：
def findAll(self):
# ...
itemNumber = qtw.QTableWidgetItem()
itemNumber.setData(qtc.Qt.DisplayRole, block.firstLineNumber())
# since the cursor is being reused for the search, you must
# construct a *new* instance based on it
<b>itemNumber.setData(qtc.Qt.UserRole, qtg.QTextCursor(cursor))</b>
# ...
def goToLine(self, item):
index = self.tableResults.model().index(item.row(), 0)
cursor = index.data(qtc.Qt.UserRole)
self.fileViewer.setTextCursor(cursor)
self.fileViewer.setFocus()
注意：您应该使用 self.tableResults.setEditTriggers(self.tableResults.NoEditTriggers) 以避免在 table