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40
41 #include <QtGui>
42
43 #include "imagemodel.h"
44 #include "mainwindow.h"
45 #include "pixeldelegate.h"
46
47 //! [0]
MainWindow()48 MainWindow::MainWindow()
49 {
50 //! [0]
51 currentPath = QDir::homePath();
52 model = new ImageModel(this);
53
54 QWidget *centralWidget = new QWidget;
55
56 //! [1]
57 view = new QTableView;
58 view->setShowGrid(false);
59 view->horizontalHeader()->hide();
60 view->verticalHeader()->hide();
61 view->horizontalHeader()->setMinimumSectionSize(1);
62 view->verticalHeader()->setMinimumSectionSize(1);
63 view->setModel(model);
64 //! [1]
65
66 //! [2]
67 PixelDelegate *delegate = new PixelDelegate(this);
68 view->setItemDelegate(delegate);
69 //! [2]
70
71 //! [3]
72 QLabel *pixelSizeLabel = new QLabel(tr("Pixel size:"));
73 QSpinBox *pixelSizeSpinBox = new QSpinBox;
74 pixelSizeSpinBox->setMinimum(4);
75 pixelSizeSpinBox->setMaximum(32);
76 pixelSizeSpinBox->setValue(12);
77 //! [3]
78
79 QMenu *fileMenu = new QMenu(tr("&File"), this);
80 QAction *openAction = fileMenu->addAction(tr("&Open..."));
81 openAction->setShortcuts(QKeySequence::Open);
82
83 printAction = fileMenu->addAction(tr("&Print..."));
84 printAction->setEnabled(false);
85 printAction->setShortcut(QKeySequence::Print);
86
87 QAction *quitAction = fileMenu->addAction(tr("E&xit"));
88 quitAction->setShortcuts(QKeySequence::Quit);
89
90 QMenu *helpMenu = new QMenu(tr("&Help"), this);
91 QAction *aboutAction = helpMenu->addAction(tr("&About"));
92
93 menuBar()->addMenu(fileMenu);
94 menuBar()->addSeparator();
95 menuBar()->addMenu(helpMenu);
96
97 connect(openAction, SIGNAL(triggered()), this, SLOT(chooseImage()));
98 connect(printAction, SIGNAL(triggered()), this, SLOT(printImage()));
99 connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
100 connect(aboutAction, SIGNAL(triggered()), this, SLOT(showAboutBox()));
101 //! [4]
102 connect(pixelSizeSpinBox, SIGNAL(valueChanged(int)),
103 delegate, SLOT(setPixelSize(int)));
104 connect(pixelSizeSpinBox, SIGNAL(valueChanged(int)),
105 this, SLOT(updateView()));
106 //! [4]
107
108 QHBoxLayout *controlsLayout = new QHBoxLayout;
109 controlsLayout->addWidget(pixelSizeLabel);
110 controlsLayout->addWidget(pixelSizeSpinBox);
111 controlsLayout->addStretch(1);
112
113 QVBoxLayout *mainLayout = new QVBoxLayout;
114 mainLayout->addWidget(view);
115 mainLayout->addLayout(controlsLayout);
116 centralWidget->setLayout(mainLayout);
117
118 setCentralWidget(centralWidget);
119
120 setWindowTitle(tr("Pixelator"));
121 resize(640, 480);
122 //! [5]
123 }
124 //! [5]
125
chooseImage()126 void MainWindow::chooseImage()
127 {
128 QString fileName = QFileDialog::getOpenFileName(this,
129 tr("Choose an image"), currentPath, "*");
130
131 if (!fileName.isEmpty())
132 openImage(fileName);
133 }
134
openImage(const QString & fileName)135 void MainWindow::openImage(const QString &fileName)
136 {
137 QImage image;
138
139 if (image.load(fileName)) {
140 model->setImage(image);
141 if (!fileName.startsWith(":/")) {
142 currentPath = fileName;
143 setWindowTitle(tr("%1 - Pixelator").arg(currentPath));
144 }
145
146 printAction->setEnabled(true);
147 updateView();
148 }
149 }
150
printImage()151 void MainWindow::printImage()
152 {
153 #ifndef QT_NO_PRINTER
154 if (model->rowCount(QModelIndex())*model->columnCount(QModelIndex())
155 > 90000) {
156 QMessageBox::StandardButton answer;
157 answer = QMessageBox::question(this, tr("Large Image Size"),
158 tr("The printed image may be very large. Are you sure that "
159 "you want to print it?"),
160 QMessageBox::Yes | QMessageBox::No);
161 if (answer == QMessageBox::No)
162 return;
163 }
164
165 QPrinter printer(QPrinter::HighResolution);
166
167 QPrintDialog *dlg = new QPrintDialog(&printer, this);
168 dlg->setWindowTitle(tr("Print Image"));
169
170 if (dlg->exec() != QDialog::Accepted)
171 return;
172
173 QPainter painter;
174 painter.begin(&printer);
175
176 int rows = model->rowCount(QModelIndex());
177 int columns = model->columnCount(QModelIndex());
178 int sourceWidth = (columns+1) * ItemSize;
179 int sourceHeight = (rows+1) * ItemSize;
180
181 painter.save();
182
183 double xscale = printer.pageRect().width()/double(sourceWidth);
184 double yscale = printer.pageRect().height()/double(sourceHeight);
185 double scale = qMin(xscale, yscale);
186
187 painter.translate(printer.paperRect().x() + printer.pageRect().width()/2,
188 printer.paperRect().y() + printer.pageRect().height()/2);
189 painter.scale(scale, scale);
190 painter.translate(-sourceWidth/2, -sourceHeight/2);
191
192 QStyleOptionViewItem option;
193 QModelIndex parent = QModelIndex();
194
195 QProgressDialog progress(tr("Printing..."), tr("Cancel"), 0, rows, this);
196 progress.setWindowModality(Qt::ApplicationModal);
197 float y = ItemSize/2;
198
199 for (int row = 0; row < rows; ++row) {
200 progress.setValue(row);
201 qApp->processEvents();
202 if (progress.wasCanceled())
203 break;
204
205 float x = ItemSize/2;
206
207 for (int column = 0; column < columns; ++column) {
208 option.rect = QRect(int(x), int(y), ItemSize, ItemSize);
209 view->itemDelegate()->paint(&painter, option,
210 model->index(row, column, parent));
211 x = x + ItemSize;
212 }
213 y = y + ItemSize;
214 }
215 progress.setValue(rows);
216
217 painter.restore();
218 painter.end();
219
220 if (progress.wasCanceled()) {
221 QMessageBox::information(this, tr("Printing canceled"),
222 tr("The printing process was canceled."), QMessageBox::Cancel);
223 }
224 #else
225 QMessageBox::information(this, tr("Printing canceled"),
226 tr("Printing is not supported on this Qt build"), QMessageBox::Cancel);
227 #endif
228 }
229
showAboutBox()230 void MainWindow::showAboutBox()
231 {
232 QMessageBox::about(this, tr("About the Pixelator example"),
233 tr("This example demonstrates how a standard view and a custom\n"
234 "delegate can be used to produce a specialized representation\n"
235 "of data in a simple custom model."));
236 }
237
238 //! [6]
updateView()239 void MainWindow::updateView()
240 {
241 view->resizeColumnsToContents();
242 view->resizeRowsToContents();
243 }
244 //! [6]
245