C ++ exercises (III)

// Finddialog. h
# Ifndef finddialog_h
# Define finddialog_h
# Include <qdialog>
Class qcheckbox;
Class qlabel;
Class qlineedit;
Class qpushbutton;

Class finddialog: Public qdialog
{
Q_object
Public:
Finddialog (qwidget * parent = 0 );
Signals: // declare the signal
Void findnext (const qstring & STR, QT: casesensiti1_cs );
Void findprev (const qstring & STR, QT: casesensiti1_cs );
Private slots: // declaration slot
Void findclicked ();
Void enablefindbutton (const qstring & Str );
PRIVATE:
Qlabel * lable;
Qlineedit * lineedit;
Qcheckbox * casecheckbox;
Qcheckbox * backwardcheckbox;
Qpushbutton * findbtn;
Qpushbutton * closebtn;
};

# Endif

// Finddialog. cpp
# Include <qtgui>
# Include "finddialog. H"

Finddialog: finddialog (qwidget * parent): qdialog (parent)
{

This-> lable = new qlabel (TR ("find & what:"), this );
This-> lineedit = new qlineedit (this );
Lable-> setbuddy (lineedit );

Casecheckbox = new qcheckbox (TR ("Match & Case"), this );
Backwardcheckbox = new qcheckbox (TR ("Search & backward"), this );

Findbtn = new qpushbutton (TR ("& find"), this );
Findbtn-> setdefault (true );
Findbtn-> setenabled (false );
Closebtn = new qpushbutton (TR ("close"), this );

Qobject: connect (lineedit, signal (textchanged (const qstring &), this, slot (enablefindbutton (const qstring &)));
Qobject: connect (findbtn, signal (clicked (), this, slot (findclicked ()));
Qobject: connect (closebtn, signal (clicked (), this, slot (close ()));

Qhboxlayout * topleftlayout = new qhboxlayout;
Topleftlayout-> addwidget (lable );
Topleftlayout-> addwidget (lineedit );

Qvboxlayout * leftlayout = new qvboxlayout;
Leftlayout-> addlayout (topleftlayout );
Leftlayout-> addwidget (casecheckbox );
Leftlayout-> addwidget (backwardcheckbox );

Qvboxlayout * rightlayout = new qvboxlayout;
Rightlayout-> addwidget (findbtn );
Rightlayout-> addwidget (closebtn );
Rightlayout-> addstretch (1 );

Qhboxlayout * mainlayout = new qhboxlayout (this );
Mainlayout-> setmargin (11 );
Mainlayout-> setspacing (5 );
Mainlayout-> addlayout (leftlayout );
Mainlayout-> addlayout (rightlayout );
This-> setwindowtitle (TR ("find "));
This-> setfixedheight (sizehint (). Height ());
}

Void finddialog: findclicked ()
{
Qstring text = lineedit-> text ();
Qt: casesensiti1_cs = casecheckbox-> ischecked ()? Qt: casesensitive: QT: caseinsensitive;

If (backwardcheckbox-> ischecked ())
Emit findprev (text, CS); // transmits "Forward search signal"
Else
Emit findnext (text, CS); // transmits "Backward Search signal"
}

Void finddialog: enablefindbutton (const qstring & Str)
{
Findbtn-> setenabled (! Str. isempty ());
}

// Main. cpp
# Include <qapplication>
# Include "finddialog. H"

Int main (INT argc, char * argv [])
{
Qapplication app (argc, argv );
Finddialog * dialog = new finddialog;
Dialog-> show ();
Return app.exe C ();
}