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After re-planning the custom folder, compilation errors occurred, such as

Qmake WARNING: Failure to find: xxxxxx.h

or

error: XXXX.h: No such file or directory

If the file is directly relocated to a new directory under Windows, you need to modify the .pro file

The old files may not be commented or deleted, as follows (commented)

SOURCES += 
    # BoyAndGirlExample.cpp 
    # CharExample.cpp 
    # FontExample.cpp 
    # TextEditorExample.cpp 
    # buttonexample.cpp 
    # comboxexample.cpp 
    # datetimeexample.cpp 
    # defaulthandlerexample.cpp 

After the directory is reorganized, references between files need to be made based on the relative paths of the files, such as

#include "widgets/FontExample.h"
#include "widgets/numconvert.h"
#include "widgets/spinboxexample.h"
#include "widgets/buttonexample.h"
#include "widgets/sliderprocess.h"
#include "widgets/datetimeexample.h"
#include "widgets/timerexample.h"