Headline

A GUI contribution by means of Qt.

Source code for this contribution you can find here.

Motivation

Specifically, the GUI provides the following features:

Architecture

The implementation uses the common MV architecture used in Qt. The main window contains the view for the company, departments and employees. For presenting the company hierarchy an object of the QtreeView provided by Qt is used. Three dialogs will appear when the associated slot is triggered enabling further user interaction. The signal and slot concept is mainly used for communicating between objects and loose coupling. The model(Treemodel) is derived from QAbstractItemModel and modifies it with some additional functions. It communicates with TreeItems by means of indexes.

Illustration

Nodes of the tree could be objects of Company,Department or Employee. QVariant is a union for common data types. Here we have added the mentions types to the QVarinat:

class Company:public QObject
{
    Q_OBJECT
...
};
Q_DECLARE_METATYPE(Company*);

Here is a slot for the signal clicked defined. the clicked signal is defined in the QAbstractButton class and is ready to be used. In the next step we connect the defined slot to the signal.

private slots:
    void on_okButton_clicked();

    connect(ui->okButton, SIGNAL(clicked()), this, SLOT(on_okButton_clicked()));

As soon as the object which sends the signal changes its state, the object which is interested in this change will receive the signal. The sender would not know if the signal is delivered to the receiver.

The metaobject compiler runs over the code and produces the following such that signals and slots can be used:

static const char qt_meta_stringdata_newDepartmentdialog[] = {
    "newDepartmentdialog\0\0on_okButton_clicked()\0"
    "on_cancelButton_clicked()\0"
};

void newDepartmentdialog::qt_static_metacall(QObject *_o, QMetaObject::Call _c, int _id, void **_a)
{
    if (_c == QMetaObject::InvokeMetaMethod) {
        Q_ASSERT(staticMetaObject.cast(_o));
        newDepartmentdialog *_t = static_cast<newDepartmentdialog *>(_o);
        switch (_id) {
        case 0: _t->on_okButton_clicked(); break;
        case 1: _t->on_cancelButton_clicked(); break;
        default: ;
        }
    }

Usage

for compiling you have to run qmake and then make. Everything will be ready for running.

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    Syntax for editing wiki

    For you are available next options:

    will make text bold.

    will make text italic.

    will make text underlined.

    will make text striked.

    will allow you to paste code headline into the page.

    will allow you to link into the page.

    will allow you to paste code with syntax highlight into the page. You will need to define used programming language.

    will allow you to paste image into the page.

    is list with bullets.

    is list with numbers.

    will allow your to insert slideshare presentation into the page. You need to copy link to presentation and insert it as parameter in this tag.

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