将文本编辑的滚动条移至顶部

Question

hi i'm having some issues to move the scrollbar to the top. I put a image into a QTextEdit and when i open the scrollbar is in the bottom. I need that the scrollbar is on the top

i tried all these but it didn't work for me. still the same.

ui.textEdit->verticalScrollBar()->setValue(0);

myTextEdit -> moveCursor (QTextCursor::Start) ;
myTextEdit -> ensureCursorVisible() ;

QScrollBar *vScrollBar = yourTextEdit->verticalScrollBar();
vScrollBar->triggerAction(QScrollBar::SliderToMinimum);

here is my code.

RulesDialog::RulesDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::RulesDialog)
{
    ui->setupUi(this);    
    setWindowIcon(QIcon(":/images/icon3.png"));
    ui->textEdit->insertHtml("<img src=':/images/reglas.png'>");
}

Answer 1

• myTextEdit->moveCursor(QTextCursor::Start);
  This will not work because the cursor covers the vertical length of the image and so will not move and neither will the scrollbar. If you had text above the image it would work.

• vScrollBar->triggerAction(QScrollBar::SliderToMinimum);
  This I think does not work because the QTextEdit will scroll down on the next qt event loop update after an insert. The following is a workaround for that, it will defer the scrolling up to the next event loop update:

   RulesDialog::RulesDialog(QWidget *parent) : QDialog(parent), ui(new Ui::RulesDialog) { ui->setupUi(this); setWindowIcon(QIcon(":/images/icon3.png")); ui->textEdit->insertHtml("<img src=':/images/reglas.png'>"); scrollUpLater(); } void RulesDialog::scrollUpLater() { QTimer::singleShot(0, [this](){ ui->textEdit->verticalScrollBar()->triggerAction(QScrollBar::SliderToMinimum); // or // ui->textEdit->verticalScrollBar()->setValue(0); }); }