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50
51#include <QtWidgets>
52
53#include "mdichild.h"
54
55MdiChild::MdiChild()
56{
57 setAttribute(Qt::WA_DeleteOnClose);
58 isUntitled = true;
59}
60
61void MdiChild::newFile()
62{
63 static int sequenceNumber = 1;
64
65 isUntitled = true;
66 curFile = tr("document%1.txt").arg(sequenceNumber++);
67 setWindowTitle(curFile + "[*]");
68
69 connect(document(), &QTextDocument::contentsChanged,
70 this, &MdiChild::documentWasModified);
71}
72
73bool MdiChild::loadFile(const QString &fileName)
74{
75 QFile file(fileName);
76 if (!file.open(QFile::ReadOnly | QFile::Text)) {
77 QMessageBox::warning(this, tr("MDI"),
78 tr("Cannot read file %1:\n%2.")
79 .arg(fileName)
80 .arg(file.errorString()));
81 return false;
82 }
83
84 QTextStream in(&file);
85 QGuiApplication::setOverrideCursor(Qt::WaitCursor);
86 setPlainText(in.readAll());
87 QGuiApplication::restoreOverrideCursor();
88
89 setCurrentFile(fileName);
90
91 connect(document(), &QTextDocument::contentsChanged,
92 this, &MdiChild::documentWasModified);
93
94 return true;
95}
96
97bool MdiChild::save()
98{
99 if (isUntitled) {
100 return saveAs();
101 } else {
102 return saveFile(curFile);
103 }
104}
105
106bool MdiChild::saveAs()
107{
108 QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
109 curFile);
110 if (fileName.isEmpty())
111 return false;
112
113 return saveFile(fileName);
114}
115
116bool MdiChild::saveFile(const QString &fileName)
117{
118 QString errorMessage;
119
120 QGuiApplication::setOverrideCursor(Qt::WaitCursor);
121 QSaveFile file(fileName);
122 if (file.open(QFile::WriteOnly | QFile::Text)) {
123 QTextStream out(&file);
124 out << toPlainText();
125 if (!file.commit()) {
126 errorMessage = tr("Cannot write file %1:\n%2.")
127 .arg(QDir::toNativeSeparators(fileName), file.errorString());
128 }
129 } else {
130 errorMessage = tr("Cannot open file %1 for writing:\n%2.")
131 .arg(QDir::toNativeSeparators(fileName), file.errorString());
132 }
133 QGuiApplication::restoreOverrideCursor();
134
135 if (!errorMessage.isEmpty()) {
136 QMessageBox::warning(this, tr("MDI"), errorMessage);
137 return false;
138 }
139
140 setCurrentFile(fileName);
141 return true;
142}
143
144QString MdiChild::userFriendlyCurrentFile()
145{
146 return strippedName(curFile);
147}
148
149void MdiChild::closeEvent(QCloseEvent *event)
150{
151 if (maybeSave()) {
152 event->accept();
153 } else {
154 event->ignore();
155 }
156}
157
158void MdiChild::documentWasModified()
159{
160 setWindowModified(document()->isModified());
161}
162
163bool MdiChild::maybeSave()
164{
165 if (!document()->isModified())
166 return true;
167 const QMessageBox::StandardButton ret
168 = QMessageBox::warning(this, tr("MDI"),
169 tr("'%1' has been modified.\n"
170 "Do you want to save your changes?")
171 .arg(userFriendlyCurrentFile()),
172 QMessageBox::Save | QMessageBox::Discard
173 | QMessageBox::Cancel);
174 switch (ret) {
175 case QMessageBox::Save:
176 return save();
177 case QMessageBox::Cancel:
178 return false;
179 default:
180 break;
181 }
182 return true;
183}
184
185void MdiChild::setCurrentFile(const QString &fileName)
186{
187 curFile = QFileInfo(fileName).canonicalFilePath();
188 isUntitled = false;
189 document()->setModified(false);
190 setWindowModified(false);
191 setWindowTitle(userFriendlyCurrentFile() + "[*]");
192}
193
194QString MdiChild::strippedName(const QString &fullFileName)
195{
196 return QFileInfo(fullFileName).fileName();
197}
198