QTextCursor does not move

[dotjan]

Hi, I am using QTextCursor to move my cursor at the Start and at the End of my QTextEdit document.

Strangely, while I can move it to the Start with QTextCursor::Start, it seems it does not move to the end with QTextCursor::End

Here is my code

void MyPage::find(const QString &text, QTextDocument::FindFlags flags)
{
    if ( !uiL->textEdit->find(text, flags) ) {
 
        // if searching backward move cursor at the end
        if ( flags == QTextDocument::FindBackward ) {
 
            QTextCursor mycursor;
            uiL->textEdit->setTextCursor(mycursor);
            mycursor.movePosition(QTextCursor::End); // THIS DOES NOT WORK, OR AT LEAST IT SEEMS SO
        }
 
        // if searching foreward move cursor at the start
        if ( flags != QTextDocument::FindBackward ) {
            QTextCursor mycursor;
            uiL->textEdit->setTextCursor(mycursor);
            mycursor.movePosition(QTextCursor::Start); // THIS WORKS
        }
 
        // once cursor is moved search again. If return false than the word does not exist in the doc
        if ( !uiL->textEdit->find(text, flags) ) {
            qDebug()<<"Not found";
        }
    }
}

void MyPage::find(const QString &text, QTextDocument::FindFlags flags)
{
    if ( !uiL->textEdit->find(text, flags) ) {

        // if searching backward move cursor at the end
        if ( flags == QTextDocument::FindBackward ) {
            
            QTextCursor mycursor;
            uiL->textEdit->setTextCursor(mycursor);
            mycursor.movePosition(QTextCursor::End); // THIS DOES NOT WORK, OR AT LEAST IT SEEMS SO
        }

        // if searching foreward move cursor at the start
        if ( flags != QTextDocument::FindBackward ) {
            QTextCursor mycursor;
            uiL->textEdit->setTextCursor(mycursor);
            mycursor.movePosition(QTextCursor::Start); // THIS WORKS
        }

        // once cursor is moved search again. If return false than the word does not exist in the doc
        if ( !uiL->textEdit->find(text, flags) ) {
            qDebug()<<"Not found";
        }
    }
}

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So basically when I am searching backward I always get "Not Found" when reached the top, I would expect to find the first occurrence from the bottom instead. DOes it make sense?

Thanks,
Jan

[amleto]

Hi, I am using QTextCursor to move my cursor at the Start and at the End of my QTextEdit document.

Strangely, while I can move it to the Start with QTextCursor::Start, it seems it does not move to the end with QTextCursor::End

Here is my code

void MyPage::find(const QString &text, QTextDocument::FindFlags flags)
{
    if ( !uiL->textEdit->find(text, flags) ) {
 
        // if searching backward move cursor at the end
        if ( flags == QTextDocument::FindBackward ) {
 
            QTextCursor mycursor;
            mycursor.movePosition(QTextCursor::End); // try here instead
            uiL->textEdit->setTextCursor(mycursor);
        }
 
        // if searching foreward move cursor at the start
        if ( flags != QTextDocument::FindBackward ) {
            QTextCursor mycursor;
            uiL->textEdit->setTextCursor(mycursor);
            mycursor.movePosition(QTextCursor::Start); // THIS WORKS - actually, this doesnt do anything...
        }
 
        // once cursor is moved search again. If return false than the word does not exist in the doc
        if ( !uiL->textEdit->find(text, flags) ) {
            qDebug()<<"Not found";
        }
    }
}

void MyPage::find(const QString &text, QTextDocument::FindFlags flags)
{
    if ( !uiL->textEdit->find(text, flags) ) {

        // if searching backward move cursor at the end
        if ( flags == QTextDocument::FindBackward ) {
            
            QTextCursor mycursor;
            mycursor.movePosition(QTextCursor::End); // try here instead
            uiL->textEdit->setTextCursor(mycursor);
        }

        // if searching foreward move cursor at the start
        if ( flags != QTextDocument::FindBackward ) {
            QTextCursor mycursor;
            uiL->textEdit->setTextCursor(mycursor);
            mycursor.movePosition(QTextCursor::Start); // THIS WORKS - actually, this doesnt do anything...
        }

        // once cursor is moved search again. If return false than the word does not exist in the doc
        if ( !uiL->textEdit->find(text, flags) ) {
            qDebug()<<"Not found";
        }
    }
}

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So basically when I am searching backward I always get "Not Found" when reached the top, I would expect to find the first occurrence from the bottom instead. DOes it make sense?

Thanks,
Jan

see code changes

do you know the reason why your way cannot work?

[dotjan]

Hi, actually it does not work either with your changes. But I have now found the solution by a chance..

if ( !uiL->textEdit->find(text, flags) ) {
 
        // if searching foreward, set backward flag and move cursor at the start
        if ( flags == QTextDocument::FindBackward ) {
            QTextCursor mycursor = uiL->textEdit->textCursor();
            mycursor.movePosition(QTextCursor::End);
            uiL->textEdit->setTextCursor(mycursor);
        }
 
        if ( flags != QTextDocument::FindBackward ) {
            QTextCursor mycursor = uiL->textEdit->textCursor();
            mycursor.movePosition(QTextCursor::Start);
            uiL->textEdit->setTextCursor(mycursor);
        }
    }

if ( !uiL->textEdit->find(text, flags) ) {

        // if searching foreward, set backward flag and move cursor at the start
        if ( flags == QTextDocument::FindBackward ) {
            QTextCursor mycursor = uiL->textEdit->textCursor();
            mycursor.movePosition(QTextCursor::End);
            uiL->textEdit->setTextCursor(mycursor);
        }

        if ( flags != QTextDocument::FindBackward ) {
            QTextCursor mycursor = uiL->textEdit->textCursor();
            mycursor.movePosition(QTextCursor::Start);
            uiL->textEdit->setTextCursor(mycursor);
        }
    }

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[amleto]

you move cursor to end when searching backwards - it doesn't match your comment.

did you understand why your initial way will never work - it is an important concept/mechanism of c++!