为什么此代码不突出显示找到的搜索词？

发布于 2024-12-24 01:29:22 字数 703 浏览 5 评论 0 原文

下面的代码在找到搜索词时不会突出显示该搜索词。事实上，按下“下一步”按钮后，光标会从 QPlainTextEdit（称为 ui->Editor）中消失。是什么原因造成的？

void TextEditor::findNextInstanceOfSearchTerm()
{
    QString searchTerm = this->edtFind->text();

    if(this->TextDocument == NULL)
    {
        this->TextDocument = ui->Editor->document();
    }


    QTextCursor documentCursor(this->TextDocument);

    documentCursor = this->TextDocument->find(searchTerm,documentCursor);

    if(!documentCursor.isNull())
    {
        documentCursor.select(QTextCursor::WordUnderCursor);

    }else
    {
        ui->statusbar->showMessage("\""+searchTerm+"\" could not be found",MESSAGE_DURATION);

    }
}

原文

The code below does not highlight the search term when it is found. In fact the cursor disappears from the QPlainTextEdit (called ui->Editor) after pressing the 'next' button. What's causing it?

void TextEditor::findNextInstanceOfSearchTerm()
{
    QString searchTerm = this->edtFind->text();

    if(this->TextDocument == NULL)
    {
        this->TextDocument = ui->Editor->document();
    }


    QTextCursor documentCursor(this->TextDocument);

    documentCursor = this->TextDocument->find(searchTerm,documentCursor);

    if(!documentCursor.isNull())
    {
        documentCursor.select(QTextCursor::WordUnderCursor);

    }else
    {
        ui->statusbar->showMessage("\""+searchTerm+"\" could not be found",MESSAGE_DURATION);

    }
}

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眼藏柔 2024-12-31 01:29:22

首先，每次按“下一步”按钮时，代码都会在文档的开头创建一个新光标，因此您将始终从头开始搜索。其次，您必须了解您操作的光标与 QPlainTextEdit 中的光标无关：您操作的是一个副本。如果要影响文本编辑，则必须使用 setTextCursor。这是一个可行的解决方案：

void TextEditor::findNextInstanceOfSearchTerm()
{
    QString searchTerm = this->edtFind->text();

    if(this->TextDocument == NULL)
    {
        this->TextDocument = ui->Editor->document();
    }

    // get the current cursor
    QTextCursor documentCursor = ui->Editor->textCursor();

    documentCursor = this->TextDocument->find(searchTerm,documentCursor);

    if(!documentCursor.isNull())
    {
        // needed only if you want the entire word to be selected
        documentCursor.select(QTextCursor::WordUnderCursor);

        // modify the text edit cursor
        ui->Editor->setTextCursor(documentCursor);
    }
    else
    {
        ui->statusbar->showMessage(
            "\""+searchTerm+"\" could not be found",MESSAGE_DURATION);
    }
}

作为旁注，您可能想知道QPlainTextEdit提供了find 方法，所以这可能是实现您想要的效果的更简单的方法：

void TextEditor::findNextInstanceOfSearchTerm()
{
    QString searchTerm = this->edtFind->text();

    bool found = ui->Editor->find(searchTerm);

    if (found)
    {
        QTextCursor cursor = ui->Editor->textCursor();
        cursor.select(QTextCursor::WordUnderCursor);
        ui->Editor->setTextCursor(cursor);
    }
    else
    {
        // set message in status bar
    }
}

Firstly, your code creates a new cursor at the beginning of the document each time you press the next button, so you will always search from the beginning. Secondly, you must understand that the cursor you manipulate has nothing to do with the one in your QPlainTextEdit: you manipulate a copy. If you want to impact the text edit, you must modify its cursor using setTextCursor. Here is a working solution:

void TextEditor::findNextInstanceOfSearchTerm()
{
    QString searchTerm = this->edtFind->text();

    if(this->TextDocument == NULL)
    {
        this->TextDocument = ui->Editor->document();
    }

    // get the current cursor
    QTextCursor documentCursor = ui->Editor->textCursor();

    documentCursor = this->TextDocument->find(searchTerm,documentCursor);

    if(!documentCursor.isNull())
    {
        // needed only if you want the entire word to be selected
        documentCursor.select(QTextCursor::WordUnderCursor);

        // modify the text edit cursor
        ui->Editor->setTextCursor(documentCursor);
    }
    else
    {
        ui->statusbar->showMessage(
            "\""+searchTerm+"\" could not be found",MESSAGE_DURATION);
    }
}

As a side note, you might want to know that QPlainTextEdit provides a find method, so this might be an easier way to achieve what you want:

void TextEditor::findNextInstanceOfSearchTerm()
{
    QString searchTerm = this->edtFind->text();

    bool found = ui->Editor->find(searchTerm);

    if (found)
    {
        QTextCursor cursor = ui->Editor->textCursor();
        cursor.select(QTextCursor::WordUnderCursor);
        ui->Editor->setTextCursor(cursor);
    }
    else
    {
        // set message in status bar
    }
}

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