Qlineedit is automatically completed

------------------------------------- Completelineedit. h -------------------------------------

# Ifndef completelineedit_h

# Define completelineedit_h

 

# Include <qtgui/qlineedit>

# Include <qstringlist>

 

Class qlistview;

Class qstringlistmodel;

Class qmodelindex;

 

Class completelineedit: Public qlineedit {

Q_object

Public:

Completelineedit (qstringlist words, qwidget * parent = 0 );

 

Public slots:

Void setcompleter (const qstring & text); // dynamic display Completion list

Void completetext (const qmodelindex & Index); // click an item in the Completion list to use this item to automatically complete the entered word

 

Protected:

Virtual void keypressevent (qkeyevent * E );

Virtual void focusoutevent (qfocusevent * E );

 

PRIVATE:

Qstringlist words; // The words in the complete list

Qlistview * listview; // complete list

Qstringlistmodel * model; // model for completing the list

};

 

# Endif // completelineedit_h

------------------------------------- Completelineedit. cpp -------------------------------------

# Include "completelineedit. H"

# Include <qkeyevent>

# Include <qtgui/qlistview>

# Include <qtgui/qstringlistmodel>

# Include <qdebug>

 

Completelineedit: completelineedit (qstringlist words, qwidget * parent)

: Qlineedit (parent), words (words ){

Listview = new qlistview (this );

Model = new qstringlistmodel (this );

Listview-> setwindowflags (QT: tooltip );

 

Connect (this, signal (textchanged (const qstring &), this, slot (setcompleter (const qstring &)));

Connect (listview, signal (clicked (const qmodelindex &), this, slot (completetext (const qmodelindex &)));

}

 

Void completelineedit: focusoutevent (qfocusevent * E ){

// Listview-> hide ();

}

 

Void completelineedit: keypressevent (qkeyevent * E ){

If (! Listview-> ishidden ()){

Int key = e-> key ();

Int COUNT = listview-> model ()-> rowcount ();

Qmodelindex currentindex = listview-> currentindex ();

 

If (QT: key_down = Key ){

// When you press the downward arrow key, move the cursor to select an item in the next Completion list

Int ROW = currentindex. Row () + 1;

If (row> = count ){

Row = 0;

}

 

Qmodelindex Index = listview-> model ()-> index (row, 0 );

Listview-> setcurrentindex (INDEX );

} Else if (QT: key_up = Key ){

// Press the downward arrow key and move the cursor to select the item in the previous Completion list.

Int ROW = currentindex. Row ()-1;

If (row <0 ){

Row = count-1;

}

 

Qmodelindex Index = listview-> model ()-> index (row, 0 );

Listview-> setcurrentindex (INDEX );

} Else if (QT: key_escape = Key ){

// Hide the Completion list when you press ESC.

Listview-> hide ();

} Else if (QT: key_enter = Key | QT: key_return = Key ){

// When you press the Enter key, use the items in the completed list and hide the completed list.

If (currentindex. isvalid ()){

Qstring text = listview-> currentindex (). Data (). tostring ();

Settext (text );

}

 

Listview-> hide ();

} Else {

// In other cases, hide the Completion list and press the event on the qlineedit keyboard.

Listview-> hide ();

Qlineedit: keypressevent (E );

}

} Else {

Qlineedit: keypressevent (E );

}

}

 

Void completelineedit: setcompleter (const qstring & text ){

If (text. isempty ()){

Listview-> hide ();

Return;

}

 

If (text. Length ()> 1 )&&(! Listview-> ishidden ())){

Return;

}

 

// If a word in the complete Completion list contains the input text, add it to the Completion list string to be displayed.

Qstringlist SL;

Foreach (qstring word, words ){

If (word. Contains (text )){

SL <word;

}

}

 

Model-> setstringlist (SL );

Listview-> setmodel (model );

 

If (model-> rowcount () = 0 ){

Return;

}

 

// Position the text edit

Listview-> setminimumwidth (width ());

Listview-> setmaximumwidth (width ());

 

Qpoint P (0, height ());

Int x = maptoglobal (P). X ();

Int y = maptoglobal (P). Y () + 1;

 

Listview-> move (x, y );

Listview-> show ();

}

 

Void completelineedit: completetext (const qmodelindex & Index ){

Qstring text = index. Data (). tostring ();

Settext (text );

Listview-> hide ();

}

------------------------------------- Main. cpp ----------------------------------

# Include <qtgui/qapplication>

# Include "completelineedit. H"

# Include <qtgui>

# Include <qcompleter>

# Include <qstringlist>

 

Int main (INT argc, char * argv []) {

Qapplication A (argc, argv );

 

Qstringlist SL = qstringlist () <"Biao" <"bin" <"Huang" <"Hua" <"hello" <"Binbin" <"Hallo ";

Qwidget widgetw;

Completelineedit * edit = new completelineedit (SL );

Qpushbutton * button = new qpushbutton ("button ");

Qhboxlayout * layout = new qhboxlayout ();

Layout-> addwidget (edit );

Layout-> addwidget (button );

Widgetw. setlayout (layout );

 

Widgetw. Show ();

 

Completelineedit E (SL );

E. Show ();

 

Return a.exe C ();

}