How to create a button to underline selectedText in QTextEdit

[beckstar101]

Hello I have a QTextEdit in my Programm which I want to format by Buttons.
My first button shall underline the selectedText. I tried several ways but I always got 2 main problems.

1. The selectedText gets underlined, but all chars I writer after will be still underlined.
2. It underlines with pressbutton and deunderlines with releasebutton

My goal is to underline selectedText by pressingbutton
and setfontunderline=false afterwards by releasing the button, without de-underline the selected text.
cursor.clearselection() doesn't work.
Do I need to find another way to do this or do I just need another way of clearselection?

in the constructor:
@ QTextCursor cursor = ui.textfeld->textCursor();
ui.textfeld->setTextCursor(cursor);
ui.textfeld->ensureCursorVisible();
@

@bool Hauptfenster::eventFilter(QObject *obj, QEvent *event)
{
if (obj == ui.bunterline && event->type() == QEvent::MouseButtonPress)
{
ui.textfeld->setFontUnderline(true);
}
if (obj == ui.bunterline && event->type() == QEvent::MouseButtonRelease)
{
cursor.clearSelection();
ui.textfeld->setFontUnderline(false);
}

return QObject::eventFilter(obj, event);
}@

[SGaist]

Hi,

You should find what you need in this "example":http://doc.qt.io/qt-5/qtwidgets-richtext-textedit-example.html

[beckstar101]

I tried to run it in in visual studio but did not find out where to place th files?

[SGaist]

Do you mean you tried to open the project in visual studio ?

[beckstar101]

yes. Sorry Im learning QT and c++ at the same time

btw.

I changed my code with snippets from the example, but it doesnt work correctly. it's buggy.

line in constructor
@ cursor = ui.textfeld->textCursor();@

1.Method de-underline
2.Method underline
3.Method help Method from example
@
void Hauptfenster:: b_no_more_underline()
{
QTextCharFormat fmt;
fmt.setFontUnderline(false);
mergeFormatOnWordOrSelection(fmt);

}
void Hauptfenster:: b_underline_pressed()
{
QTextCharFormat fmt;
fmt.setFontUnderline(true);
mergeFormatOnWordOrSelection(fmt);

}
@
@

void Hauptfenster::mergeFormatOnWordOrSelection(const QTextCharFormat &format)
{
QTextCursor cursor = ui.textfeld->textCursor();
if (!cursor.hasSelection())
cursor.select(QTextCursor::WordUnderCursor);
cursor.mergeCharFormat(format);
ui.textfeld->mergeCurrentCharFormat(format);
}
@

The problem is that it is buggy as hell

For example: I write something, double click on it with mouse for selection and click underline button after that. It gets underlined, but the other chars I write after that steps get underlined too..

So this function is not good for only underline MouseselectedChars

Other example:

I Write something and Click underlineButton without marking chars with mouse. Then the written gets marked
and what I write afterwards gets marked too.

So this function also isnt a function who operators from the time of clicking Underline till clicking de_Underline. Because it also underlines the chars which where written before.

It looks like can write something in one line, and afterwards formatting the hole line underlined or de-underlined. BUT
If you write in a line 20 chars and underline then afterswards, Select char 3-7 and press de-underline, these chars are suddenly de-underlined.

Im so confused I dont know what I shall do. I dont get in any rule which operates every time. Pls help :D Im sitting here isnce about 6 hours with this function.

[SGaist]

Since you are beginning everything, you should rather user Qt Creator, it will be more simple to get started and it'll be easier to handle Qt projects.

[beckstar101]

I solved my Problem with a function which starts every time the cursor posittion changes :

I know many people did not understand what my problem is, maybe it gets clear with my solution.

@void Hauptfenster::cursorchanged()
{

QTextCursor cursor = ui.textfeld->textCursor();
QTextCharFormat format;
if(!cursor.charFormat().font().underline())

{
if (test1==true)
{
test1=false;
QColor col = Qt::white;
if(col.isValid()) {
QString qss = QString("background-color: %1").arg(col.name());
ui.bunterline->setStyleSheet(qss);
}}
}
else
{
if (test1==false)
{
test1=true;
QColor col = Qt::red;
if(col.isValid()) {
QString qss = QString("background-color: %1").arg(col.name());
ui.bunterline->setStyleSheet(qss);
}}}

if(!cursor.charFormat().font().bold())
{
if (testfett==true)
{

testfett=false;
QColor col = Qt::white;
if(col.isValid()) {
QString qss = QString("background-color: %1").arg(col.name());
ui.bFett->setStyleSheet(qss);}}

}
else
{
if (testfett==false)
{

testfett=true;
QColor col = Qt::red;
if(col.isValid()) {
QString qss = QString("background-color: %1").arg(col.name());
ui.bFett->setStyleSheet(qss);
}
}
}

}
@