[Qt4] QTextEdit & cursor visibility

[Ti_Thom]

Well, it does not work. The line is still highlighted but only the begining of the file is visible

[jpn]

Ok, I see the problem. QWidget's geometry is calculated upon first show event. You should move the ensureCursorVisible() call in QTextEdit's showEvent() or into a slot connected to a single shot timer with timeout 0. This ensures that the geometry is constructed properly before trying to do operations which rely on widget's geometry.

Either subclass QTextEdit and override it's showEvent():

void MyTextEdit::showEvent(QShowEvent* event)
{
    QTextEdit::showEvent(event);
 
    static bool initialized = false;
    if (!initialized)
    {
        ensureCursorVisible();
        initialized = true;
    }
}

void MyTextEdit::showEvent(QShowEvent* event)
{
    QTextEdit::showEvent(event);

    static bool initialized = false;
    if (!initialized)
    {
        ensureCursorVisible();
        initialized = true;
    }
}

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Or use the timer technique:

// add this in place where you had "editor->ensureCursorVisible();"
QTimer::singleShot(0, this, SLOT(initialize()));
 
// declared as a slot
void BodyWidget::initialize()
{
    // QTextEdit* editor moved as a member variable
    editor->ensureCursorVisible();
}
editor->ensureCursorVisible();

// add this in place where you had "editor->ensureCursorVisible();"
QTimer::singleShot(0, this, SLOT(initialize()));

// declared as a slot
void BodyWidget::initialize()
{
    // QTextEdit* editor moved as a member variable
    editor->ensureCursorVisible();
}
editor->ensureCursorVisible();

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[Ti_Thom]

I was also thinking about the widget's geometry computation and tryed to put "editor->ensureCursorVisible();" at the end of the BodyWidget build function, the visible text was not the right part.

I just tryed your 2nd technique, it seems to work as expected. Thanks !

[dahiya.himanshu]

QTextCursor* highlightCursor;
QTextEdit *ui_textEdit;
...
ui_textEdit->setTextCursor(*highlightCursor);
ui_textEdit->ensureCursorVisible();

just make sure u set the cursor using setTextCursor instead of ui_textEdit->textCursor().setPosition() and u call ensureCursorVisible after that.

Himanshu Dahiya