How to place an icon onto a QLineEdit?

Question

There is a Search field with the magnification-lens and a greyed out \"search\" keyword at the top right corner of stackoverflow.com web site:

Answer 1

Simple Way for Dummies

1. Add a QLineEdit, and set it frameless by QLineEdit::setFrame
2. Add a QLabel with background color in white (by stylesheet) and a icon
3. Combine the line edit and the label with a layout, set spacing to 0
4. Set placeholder text with QLineEdit::setPlaceholderText

Result

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Advanced Way

Check this thread: "Can QLineEdit do this?"

And the related python code: http://bazaar.launchpad.net/~henning-schroeder/%2Bjunk/qtwidgets/annotate/head:/qtwidgets/lineedit.py

Or

"How to do - inside in QLineEdit insert the button.[pyqt4]"

Basically customized a QLineEdit by painting a widget(label, button or even combobox) onto it. Then reset the margin, cursor, padding and the paint event. No magics!