QDesignerCustomWidgetInterface:No such file or directory. (solved)

[houmingc]

I found the link below and i try to integrate custom widget into Qt.
http://www.ics.com/blog/integrating-custom-widget-qt-designer#.VFY9U4_7sYx
I try promote but since i need to access custom widget methods, i learn that i have to use plugin instead. is this correct?

I put the header and sources file in my containing folder, when i compile, compiler complains
QDesignerCustomWidgetInterface:No such file or directory.
plugin LED file.
#include <QDesignerCustomWidgetInterface>

Can someone kindly explains

[SGaist]

Hi,

Did you add

@QT += designer@

In your pro file ?