c++ - Qt Creator 中的 Gotoline

Question

好吧，我正在做一个 Goto Line System。但它似乎不起作用。以前是这样，但我想我把它弄坏了。

void ScriptWindow::gotoLine()
{
    int line = QInputDialog::getInteger(myEdit, "Line Number","To what line do you want to go?", 1, 1, myEdit->document()->lineCount());
    QTextCursor cursor = myEdit->textCursor();
    myEdit->setTextCursor(cursor);
    cursor.setPosition(QTextCursor::Start, QTextCursor::MoveAnchor);
    while(cursor.position() == QTextCursor::Start) {
        cursor.setPosition(line - 1, QTextCursor::MoveAnchor);
    }    
}

你能告诉我我做错了什么吗？

Answer 1

将光标位置设置为零，向下移动行数，并设置 myEdit 的文本光标。

QTextCursor cursor = myEdit->textCursor();
cursor.setPosition(0);
cursor.movePosition(QTextCursor::Down, QTextCursor::MoveAnchor, line-1);
myEdit->setTextCursor(cursor);

或者，通过 QTextDocument 找到位置，然后设置位置。

int pos = myEdit->document()->findBlockByLineNumber(line-1).position();
QTextCursor cursor = myEdit->textCursor();
cursor.setPosition(pos);
myEdit->setTextCursor(cursor);