QlineEdit with constant text and editable text fields

I have a requirement to have a line edit which has a custom text which is non editable and another field where user can enter new text.
Please refer the attached image.Attachment 11516

| Image_<COUNTER> |
In that image we can see that the "<COUNTER>" part should be non editable and should always be at the last position. And "Image_" is an editable text where user can enter any text.

Is there any way to have a custom LineEdit like this.

You can use 2 line edits in horizontal layout.

Than set spacing 0 to the horizontal layout.
Then set style sheet as below.

Code:

---

QString stylesheet1 = QString("QLineEdit { background-color: white ; border: none ;  }");  //alternatively you can set border-right : none  for line edit 1 instead of border: none
    QString stylesheet2 = QString(" QLineEdit {background-color: white ; border: none ; }");                //alternatively you can set border-left : none for line edit 2 
 
    l_edit2->setText("Image_");
    l_edit2->setText("<COUNTER>");
    l_edit2->setReadOnly(true);
 
    l_edit1->setStyleSheet(stylesheet1);
    l_edit2->setStyleSheet(stylesheet2);

---

Thanks for the reply.

The content text of this LineEdit will be used as file name after replacing placeholder <COUNTER> with values from 0..N.

This above mentioned is only one use case. The actual functionality of my LineEdit will contain multiple placeholder fields like <DATE>, <TIME>, etc... which can be added to the LineEdit on the current cursor position.

So its not an option to use multiple LineEdits.

May you could explain your requirement, Insted of single usecase.

Hello,

if youre use cases allow for a maximum length of the editable sections of the line edit content, you could try using line edit input mask. See http://doc.qt.io/qt-5.4/qlineedit.html#inputMask-prop

Best regards
ars

Usecase1: mode = Cyclic
In this case by default there will be only <COUNTER> in LineEdit[automatically added] and this should be always at the end of the LineEdit and which should not be edited. But the user can insert new characters before <COUNTER>[All entries in the pop up list cannot be used by the user[shows warning on selection]

Usecase2: mode = Limited
In this use case user can add any place holder[<CONTER>, <DATE>, <TIME>, etc...] from the pop up list and all this can be editable[no restrictions] and user can insert new characters anywhere in the LineEdit.
Attachment 11522

Thnaks for the inputs.
Now I have found a way to make my <COUNTER> non editable using the mask

Code:

---

lineEdit->setInputMask("xxxx\<\C\O\U\N\T\E\R\>");

---

Now thw problem is I am able to enter only 4 characters before <COUNTER> but i want to allow the user to enter maximum of 91 charcters.

What should I modify on the reg expression to achieve this?