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50
51#include "pieview.h"
52#include "mainwindow.h"
53
54#include <QtWidgets>
55
56MainWindow::MainWindow(QWidget *parent)
57 : QMainWindow(parent)
58{
59 QMenu *fileMenu = new QMenu(tr(s: "&File"), this);
60 QAction *openAction = fileMenu->addAction(text: tr(s: "&Open..."));
61 openAction->setShortcuts(QKeySequence::Open);
62 QAction *saveAction = fileMenu->addAction(text: tr(s: "&Save As..."));
63 saveAction->setShortcuts(QKeySequence::SaveAs);
64 QAction *quitAction = fileMenu->addAction(text: tr(s: "E&xit"));
65 quitAction->setShortcuts(QKeySequence::Quit);
66
67 setupModel();
68 setupViews();
69
70 connect(sender: openAction, signal: &QAction::triggered, receiver: this, slot: &MainWindow::openFile);
71 connect(sender: saveAction, signal: &QAction::triggered, receiver: this, slot: &MainWindow::saveFile);
72 connect(sender: quitAction, signal: &QAction::triggered, qApp, slot: &QCoreApplication::quit);
73
74 menuBar()->addMenu(menu: fileMenu);
75 statusBar();
76
77 loadFile(path: ":/Charts/qtdata.cht");
78
79 setWindowTitle(tr(s: "Chart"));
80 resize(w: 870, h: 550);
81}
82
83void MainWindow::setupModel()
84{
85 model = new QStandardItemModel(8, 2, this);
86 model->setHeaderData(section: 0, orientation: Qt::Horizontal, value: tr(s: "Label"));
87 model->setHeaderData(section: 1, orientation: Qt::Horizontal, value: tr(s: "Quantity"));
88}
89
90void MainWindow::setupViews()
91{
92 QSplitter *splitter = new QSplitter;
93 QTableView *table = new QTableView;
94 pieChart = new PieView;
95 splitter->addWidget(widget: table);
96 splitter->addWidget(widget: pieChart);
97 splitter->setStretchFactor(index: 0, stretch: 0);
98 splitter->setStretchFactor(index: 1, stretch: 1);
99
100 table->setModel(model);
101 pieChart->setModel(model);
102
103 QItemSelectionModel *selectionModel = new QItemSelectionModel(model);
104 table->setSelectionModel(selectionModel);
105 pieChart->setSelectionModel(selectionModel);
106
107 QHeaderView *headerView = table->horizontalHeader();
108 headerView->setStretchLastSection(true);
109
110 setCentralWidget(splitter);
111}
112
113void MainWindow::openFile()
114{
115 const QString fileName =
116 QFileDialog::getOpenFileName(parent: this, caption: tr(s: "Choose a data file"), dir: "", filter: "*.cht");
117 if (!fileName.isEmpty())
118 loadFile(path: fileName);
119}
120
121void MainWindow::loadFile(const QString &fileName)
122{
123 QFile file(fileName);
124 if (!file.open(flags: QFile::ReadOnly | QFile::Text))
125 return;
126
127 QTextStream stream(&file);
128
129 model->removeRows(row: 0, count: model->rowCount(parent: QModelIndex()), parent: QModelIndex());
130
131 int row = 0;
132 while (!stream.atEnd()) {
133 const QString line = stream.readLine();
134 if (!line.isEmpty()) {
135 model->insertRows(row, count: 1, parent: QModelIndex());
136
137 const QStringList pieces = line.split(sep: QLatin1Char(','), behavior: Qt::SkipEmptyParts);
138 if (pieces.size() < 3)
139 continue;
140 model->setData(index: model->index(row, column: 0, parent: QModelIndex()),
141 value: pieces.value(i: 0));
142 model->setData(index: model->index(row, column: 1, parent: QModelIndex()),
143 value: pieces.value(i: 1));
144 model->setData(index: model->index(row, column: 0, parent: QModelIndex()),
145 value: QColor(pieces.value(i: 2)), role: Qt::DecorationRole);
146 row++;
147 }
148 };
149
150 file.close();
151 statusBar()->showMessage(text: tr(s: "Loaded %1").arg(a: fileName), timeout: 2000);
152}
153
154void MainWindow::saveFile()
155{
156 QString fileName = QFileDialog::getSaveFileName(parent: this,
157 caption: tr(s: "Save file as"), dir: "", filter: "*.cht");
158
159 if (fileName.isEmpty())
160 return;
161
162 QFile file(fileName);
163 if (!file.open(flags: QFile::WriteOnly | QFile::Text))
164 return;
165
166 QTextStream stream(&file);
167 for (int row = 0; row < model->rowCount(parent: QModelIndex()); ++row) {
168
169 QStringList pieces;
170
171 pieces.append(t: model->data(index: model->index(row, column: 0, parent: QModelIndex()),
172 role: Qt::DisplayRole).toString());
173 pieces.append(t: model->data(index: model->index(row, column: 1, parent: QModelIndex()),
174 role: Qt::DisplayRole).toString());
175 pieces.append(t: model->data(index: model->index(row, column: 0, parent: QModelIndex()),
176 role: Qt::DecorationRole).toString());
177
178 stream << pieces.join(sep: ',') << "\n";
179 }
180
181 file.close();
182 statusBar()->showMessage(text: tr(s: "Saved %1").arg(a: fileName), timeout: 2000);
183}
184

source code of qtbase/examples/widgets/itemviews/chart/mainwindow.cpp