QT Primer-list box Qlistwidget class

The Qlistwidget class is also a common class in the GUI, and it derives from the Qlistview:

Class Q_gui_export Qlistwidget:public qlistview
{
    q_object

Common Methods and properties:

(1) AddItem

void AddItem (const QString & label)
void AddItem (Qlistwidgetitem * Item)
void Additems (const qstringlist & Labels)

Add one or more items.

(2)

int count () const

The total number of list items that contain hidden list items.

(3) CurrentItem

Qlistwidgetitem * CurrentItem () const

Returns the currently selected item.

(4) CurrentRow

int CurrentRow () const

Returns the ordinal of the currently selected item.

(5) InsertItem

void InsertItem (int row, Qlistwidgetitem * Item)
void InsertItem (int row, const QString & label)
void Insertitems (int row, const qstringlist & Labels)

Inserts a new item into the list box.

(6)

Qlistwidgetitem * Item (int row) const

Returns the list item that is ordinal to row.

(7) Removeitemwidget

void Removeitemwidget (Qlistwidgetitem * Item)

Deletes the specified item item.

(8) SelectedItems

Qlist<qlistwidgetitem *> SelectedItems () const

Returns the currently selected item.

(9)

void Setcurrentitem (Qlistwidgetitem * Item)

Sets the currently selected item to item.

(10)

void Setcurrentrow (int row)

Sets the current selection.

(11)

void setsortingenabled (bool enable)

Sets whether the sort feature is enabled.

(12)

void Sortitems (Qt::sortorder order = qt::ascendingorder)

To sort a list box, the value of the parameter can be:

Qt::ascendingorder 0 The items is sorted ascending e.g. starts with ' AAA ' ends with ' ZZZ ' in La Tin-1 locales
Qt::D Escendingorder 1 The items is sorted descending e.g. starts with ' ZZZ ' ends with ' AAA ' in Lat In-1 locales
(13)

Qlistwidgetitem * Qlistwidget::takeitem (int row)

Deletes an item.

Example:

Window.h

#ifndef __window_h__ #define __WINDOW_H__ #include <QMainWindow> #include <QPushButton> #include <
qlineedit> #include <QLayout> #include <QLabel> #include <QComboBox> #include <QMessageBox> #include <QDialog> #include <QListWidget> class window:public Qmainwindow {q_object Public:window (qwi
		Dget *parent = NULL): Qmainwindow (parent) {listwidget = new Qlistwidget (this);
		New Qlistwidgetitem (tr ("Oak"), Listwidget);
		New Qlistwidgetitem (tr ("Fir"), Listwidget);

		
		New Qlistwidgetitem (tr ("Pine"), Listwidget);
		Qlabel *lbl = new Qlabel (tr ("Select text:"));
		
		EDT = new Qlineedit;
		
		Qvboxlayout *leftlayout = new Qvboxlayout;
		Leftlayout->addwidget (Listwidget);
		Leftlayout->addwidget (LBL);

		Leftlayout->addwidget (EDT);
		Edt_add = new Qlineedit;
		Qpushbutton *add_btn = new Qpushbutton (tr ("add"));
		Qpushbutton *del_btn = new Qpushbutton (tr ("Del")); Qpushbutton *quit_btn = new Qpushbutton (tr ("quit"));
		Qvboxlayout *rightlayout = new Qvboxlayout;
		Rightlayout->addwidget (Edt_add);
		Rightlayout->addwidget (ADD_BTN);
		Rightlayout->addwidget (DEL_BTN);
		Rightlayout->addstretch ();

		Rightlayout->addwidget (QUIT_BTN);
		Qhboxlayout *mainlayout = new Qhboxlayout;
		Mainlayout->addlayout (leftlayout);

		Mainlayout->addlayout (rightlayout);
		Qwidget *mainwidget = new Qwidget;

		Mainwidget->setlayout (mainlayout);

		Setcentralwidget (Mainwidget);
		Connect (Listwidget, SIGNAL (itemselectionchanged ()), this, SLOT (itemselectionchanged ()));
		Connect (add_btn, SIGNAL (clicked ()), this, SLOT (On_add ()));
		Connect (del_btn, SIGNAL (clicked ()), this, SLOT (On_del ()));
	Connect (quit_btn, SIGNAL (clicked ()), this, SLOT (Close ()));
	} Private:qlistwidget *listwidget;

Qlineedit *edt, *edt_add;
	Private Slots:void itemselectionchanged () {Edt->settext (Listwidget->currentitem ()->text ()); } void On_add () {Listwidget->insertitem (listwidget->currentrow() + 1, edt_add->text ());
	} void On_del () {Listwidget->takeitem (Listwidget->currentrow ());


}


};
 #endif

Main.cpp

#include <QApplication>
#include <QDialog>
#include "Window.h"



int main (int argc, char *argv[ ])
{
	qapplication A (argc, argv);
	Window *mainwindow = new window;



	Mainwindow->resize (a);
	Mainwindow->setwindowtitle (Qwidget::tr ("Qt Test"));
	Mainwindow->show ();

	return a.exec ();
}

Compile and run with the following interface:

Qlistwidget items can be displayed with a picture, example:

    Qlistwidgetitem *configbutton = new Qlistwidgetitem (contentswidget);
    Configbutton->seticon (Qicon (":/images/config.png"));
    Configbutton->settext (tr ("Configuration"));
    Configbutton->settextalignment (qt::alignhcenter);
    Configbutton->setflags (qt::itemisselectable | qt::itemisenabled);

    Qlistwidgetitem *updatebutton = new Qlistwidgetitem (contentswidget);
    Updatebutton->seticon (Qicon (":/images/update.png"));
    Updatebutton->settext (tr ("Update"));
    Updatebutton->settextalignment (qt::alignhcenter);
    Updatebutton->setflags (qt::itemisselectable | qt::itemisenabled);

    Qlistwidgetitem *querybutton = new Qlistwidgetitem (contentswidget);
    Querybutton->seticon (Qicon (":/images/query.png"));
    Querybutton->settext (tr ("Query"));
    Querybutton->settextalignment (qt::alignhcenter);
    Querybutton->setflags (qt::itemisselectable | qt::itemisenabled);

As shown in figure: