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50
51#include <QFile>
52#include <QFileDialog>
53#include <QTextStream>
54#include <QMessageBox>
55#if defined(QT_PRINTSUPPORT_LIB)
56#include <QtPrintSupport/qtprintsupportglobal.h>
57#if QT_CONFIG(printer)
58#if QT_CONFIG(printdialog)
59#include <QPrintDialog>
60#endif // QT_CONFIG(printdialog)
61#include <QPrinter>
62#endif // QT_CONFIG(printer)
63#endif // QT_PRINTSUPPORT_LIB
64#include <QFont>
65#include <QFontDialog>
66
67#include "notepad.h"
68#include "ui_notepad.h"
69
70Notepad::Notepad(QWidget *parent) :
71 QMainWindow(parent),
72 ui(new Ui::Notepad)
73{
74 ui->setupUi(this);
75 this->setCentralWidget(ui->textEdit);
76
77 connect(sender: ui->actionNew, signal: &QAction::triggered, receiver: this, slot: &Notepad::newDocument);
78 connect(sender: ui->actionOpen, signal: &QAction::triggered, receiver: this, slot: &Notepad::open);
79 connect(sender: ui->actionSave, signal: &QAction::triggered, receiver: this, slot: &Notepad::save);
80 connect(sender: ui->actionSave_as, signal: &QAction::triggered, receiver: this, slot: &Notepad::saveAs);
81 connect(sender: ui->actionPrint, signal: &QAction::triggered, receiver: this, slot: &Notepad::print);
82 connect(sender: ui->actionExit, signal: &QAction::triggered, receiver: this, slot: &Notepad::exit);
83 connect(sender: ui->actionCopy, signal: &QAction::triggered, receiver: this, slot: &Notepad::copy);
84 connect(sender: ui->actionCut, signal: &QAction::triggered, receiver: this, slot: &Notepad::cut);
85 connect(sender: ui->actionPaste, signal: &QAction::triggered, receiver: this, slot: &Notepad::paste);
86 connect(sender: ui->actionUndo, signal: &QAction::triggered, receiver: this, slot: &Notepad::undo);
87 connect(sender: ui->actionRedo, signal: &QAction::triggered, receiver: this, slot: &Notepad::redo);
88 connect(sender: ui->actionFont, signal: &QAction::triggered, receiver: this, slot: &Notepad::selectFont);
89 connect(sender: ui->actionBold, signal: &QAction::triggered, receiver: this, slot: &Notepad::setFontBold);
90 connect(sender: ui->actionUnderline, signal: &QAction::triggered, receiver: this, slot: &Notepad::setFontUnderline);
91 connect(sender: ui->actionItalic, signal: &QAction::triggered, receiver: this, slot: &Notepad::setFontItalic);
92 connect(sender: ui->actionAbout, signal: &QAction::triggered, receiver: this, slot: &Notepad::about);
93
94// Disable menu actions for unavailable features
95#if !defined(QT_PRINTSUPPORT_LIB) || !QT_CONFIG(printer)
96 ui->actionPrint->setEnabled(false);
97#endif
98
99#if !QT_CONFIG(clipboard)
100 ui->actionCut->setEnabled(false);
101 ui->actionCopy->setEnabled(false);
102 ui->actionPaste->setEnabled(false);
103#endif
104}
105
106Notepad::~Notepad()
107{
108 delete ui;
109}
110
111void Notepad::newDocument()
112{
113 currentFile.clear();
114 ui->textEdit->setText(QString());
115}
116
117void Notepad::open()
118{
119 QString fileName = QFileDialog::getOpenFileName(parent: this, caption: "Open the file");
120 QFile file(fileName);
121 currentFile = fileName;
122 if (!file.open(flags: QIODevice::ReadOnly | QFile::Text)) {
123 QMessageBox::warning(parent: this, title: "Warning", text: "Cannot open file: " + file.errorString());
124 return;
125 }
126 setWindowTitle(fileName);
127 QTextStream in(&file);
128 QString text = in.readAll();
129 ui->textEdit->setText(text);
130 file.close();
131}
132
133void Notepad::save()
134{
135 QString fileName;
136 // If we don't have a filename from before, get one.
137 if (currentFile.isEmpty()) {
138 fileName = QFileDialog::getSaveFileName(parent: this, caption: "Save");
139 currentFile = fileName;
140 } else {
141 fileName = currentFile;
142 }
143 QFile file(fileName);
144 if (!file.open(flags: QIODevice::WriteOnly | QFile::Text)) {
145 QMessageBox::warning(parent: this, title: "Warning", text: "Cannot save file: " + file.errorString());
146 return;
147 }
148 setWindowTitle(fileName);
149 QTextStream out(&file);
150 QString text = ui->textEdit->toPlainText();
151 out << text;
152 file.close();
153}
154
155void Notepad::saveAs()
156{
157 QString fileName = QFileDialog::getSaveFileName(parent: this, caption: "Save as");
158 QFile file(fileName);
159
160 if (!file.open(flags: QFile::WriteOnly | QFile::Text)) {
161 QMessageBox::warning(parent: this, title: "Warning", text: "Cannot save file: " + file.errorString());
162 return;
163 }
164 currentFile = fileName;
165 setWindowTitle(fileName);
166 QTextStream out(&file);
167 QString text = ui->textEdit->toPlainText();
168 out << text;
169 file.close();
170}
171
172void Notepad::print()
173{
174#if defined(QT_PRINTSUPPORT_LIB) && QT_CONFIG(printer)
175 QPrinter printDev;
176#if QT_CONFIG(printdialog)
177 QPrintDialog dialog(&printDev, this);
178 if (dialog.exec() == QDialog::Rejected)
179 return;
180#endif // QT_CONFIG(printdialog)
181 ui->textEdit->print(printer: &printDev);
182#endif // QT_CONFIG(printer)
183}
184
185void Notepad::exit()
186{
187 QCoreApplication::quit();
188}
189
190void Notepad::copy()
191{
192#if QT_CONFIG(clipboard)
193 ui->textEdit->copy();
194#endif
195}
196
197void Notepad::cut()
198{
199#if QT_CONFIG(clipboard)
200 ui->textEdit->cut();
201#endif
202}
203
204void Notepad::paste()
205{
206#if QT_CONFIG(clipboard)
207 ui->textEdit->paste();
208#endif
209}
210
211void Notepad::undo()
212{
213 ui->textEdit->undo();
214}
215
216void Notepad::redo()
217{
218 ui->textEdit->redo();
219}
220
221void Notepad::selectFont()
222{
223 bool fontSelected;
224 QFont font = QFontDialog::getFont(ok: &fontSelected, parent: this);
225 if (fontSelected)
226 ui->textEdit->setFont(font);
227}
228
229void Notepad::setFontUnderline(bool underline)
230{
231 ui->textEdit->setFontUnderline(underline);
232}
233
234void Notepad::setFontItalic(bool italic)
235{
236 ui->textEdit->setFontItalic(italic);
237}
238
239void Notepad::setFontBold(bool bold)
240{
241 bold ? ui->textEdit->setFontWeight(QFont::Bold) :
242 ui->textEdit->setFontWeight(QFont::Normal);
243}
244
245void Notepad::about()
246{
247 QMessageBox::about(parent: this, title: tr(s: "About MDI"),
248 text: tr(s: "The <b>Notepad</b> example demonstrates how to code a basic "
249 "text editor using QtWidgets"));
250
251}
252

source code of qtbase/examples/widgets/tutorials/notepad/notepad.cpp