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50
51#include <QtWidgets>
52
53#include "chatdialog.h"
54
55ChatDialog::ChatDialog(QWidget *parent)
56 : QDialog(parent)
57{
58 setupUi(this);
59
60 lineEdit->setFocusPolicy(Qt::StrongFocus);
61 textEdit->setFocusPolicy(Qt::NoFocus);
62 textEdit->setReadOnly(true);
63 listWidget->setFocusPolicy(Qt::NoFocus);
64
65 connect(sender: lineEdit, signal: &QLineEdit::returnPressed,
66 receiver: this, slot: &ChatDialog::returnPressed);
67 connect(sender: &client, signal: &Client::newMessage,
68 receiver: this, slot: &ChatDialog::appendMessage);
69 connect(sender: &client, signal: &Client::newParticipant,
70 receiver: this, slot: &ChatDialog::newParticipant);
71 connect(sender: &client, signal: &Client::participantLeft,
72 receiver: this, slot: &ChatDialog::participantLeft);
73
74 myNickName = client.nickName();
75 newParticipant(nick: myNickName);
76 tableFormat.setBorder(0);
77 QTimer::singleShot(msec: 10 * 1000, receiver: this, SLOT(showInformation()));
78}
79
80void ChatDialog::appendMessage(const QString &from, const QString &message)
81{
82 if (from.isEmpty() || message.isEmpty())
83 return;
84
85 QTextCursor cursor(textEdit->textCursor());
86 cursor.movePosition(op: QTextCursor::End);
87 QTextTable *table = cursor.insertTable(rows: 1, cols: 2, format: tableFormat);
88 table->cellAt(row: 0, col: 0).firstCursorPosition().insertText(text: '<' + from + "> ");
89 table->cellAt(row: 0, col: 1).firstCursorPosition().insertText(text: message);
90 QScrollBar *bar = textEdit->verticalScrollBar();
91 bar->setValue(bar->maximum());
92}
93
94void ChatDialog::returnPressed()
95{
96 QString text = lineEdit->text();
97 if (text.isEmpty())
98 return;
99
100 if (text.startsWith(c: QChar('/'))) {
101 QColor color = textEdit->textColor();
102 textEdit->setTextColor(Qt::red);
103 textEdit->append(text: tr(s: "! Unknown command: %1")
104 .arg(a: text.left(n: text.indexOf(c: ' '))));
105 textEdit->setTextColor(color);
106 } else {
107 client.sendMessage(message: text);
108 appendMessage(from: myNickName, message: text);
109 }
110
111 lineEdit->clear();
112}
113
114void ChatDialog::newParticipant(const QString &nick)
115{
116 if (nick.isEmpty())
117 return;
118
119 QColor color = textEdit->textColor();
120 textEdit->setTextColor(Qt::gray);
121 textEdit->append(text: tr(s: "* %1 has joined").arg(a: nick));
122 textEdit->setTextColor(color);
123 listWidget->addItem(label: nick);
124}
125
126void ChatDialog::participantLeft(const QString &nick)
127{
128 if (nick.isEmpty())
129 return;
130
131 QList<QListWidgetItem *> items = listWidget->findItems(text: nick,
132 flags: Qt::MatchExactly);
133 if (items.isEmpty())
134 return;
135
136 delete items.at(i: 0);
137 QColor color = textEdit->textColor();
138 textEdit->setTextColor(Qt::gray);
139 textEdit->append(text: tr(s: "* %1 has left").arg(a: nick));
140 textEdit->setTextColor(color);
141}
142
143void ChatDialog::showInformation()
144{
145 if (listWidget->count() == 1) {
146 QMessageBox::information(parent: this, title: tr(s: "Chat"),
147 text: tr(s: "Launch several instances of this "
148 "program on your local network and "
149 "start chatting!"));
150 }
151}
152

source code of qtbase/examples/network/network-chat/chatdialog.cpp