working versiom

IntelliPhoto/Scribble/mainwindow.cpp

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+// ---------- mainwindow.cpp ----------
+
+#include <QtWidgets>
+
+#include "mainwindow.h"
+#include "scribblearea.h"
+
+// MainWindow constructor
+MainWindow::MainWindow()
+{   
+    //create Gui elemnts and lay them out
+    createGui();
+    // Create actions
+    createActions();
+    //create Menus
+    createMenus();
+    //set style of the gui
+    setIntelliStyle();
+
+    // Size the app
+    resize(500, 500);
+}
+
+
+// User tried to close the app
+void MainWindow::closeEvent(QCloseEvent *event)
+{
+    // If they try to close maybeSave() returns true
+    // if no changes have been made and the app closes
+    if (maybeSave()) {
+        event->accept();
+    } else {
+
+        // If there have been changes ignore the event
+        event->ignore();
+    }
+}
+
+// Check if the current image has been changed and then
+// open a dialog to open a file
+void MainWindow::open()
+{
+    // Check if changes have been made since last save
+    // maybeSave() returns true if no changes have been made
+    if (maybeSave()) {
+
+        // Get the file to open from a dialog
+        // tr sets the window title to Open File
+        // QDir opens the current dirctory
+        QString fileName = QFileDialog::getOpenFileName(this,
+                                   tr("Open File"), QDir::currentPath());
+
+        // If we have a file name load the image and place
+        // it in the scribbleArea
+        if (!fileName.isEmpty())
+            scribbleArea->openImage(fileName);
+    }
+}
+
+// Called when the user clicks Save As in the menu
+void MainWindow::save()
+{
+    // A QAction represents the action of the user clicking
+    QAction *action = qobject_cast<QAction *>(sender());
+
+    // Stores the array of bytes of the users data
+    QByteArray fileFormat = action->data().toByteArray();
+
+    // Pass it to be saved
+    saveFile(fileFormat);
+}
+
+// Opens a dialog to change the pen color
+void MainWindow::penColor()
+{
+    // Store the chosen color from the dialog
+    QColor newColor = QColorDialog::getColor(scribbleArea->penColor());
+
+    // If a valid color set it
+    if (newColor.isValid())
+        scribbleArea->setPenColor(newColor);
+}
+
+// Opens a dialog that allows the user to change the pen width
+void MainWindow::penWidth()
+{
+    // Stores button value
+    bool ok;
+
+    // tr("Scribble") is the title
+    // the next tr is the text to display
+    // Get the current pen width
+    // Define the min, max, step and ok button
+    int newWidth = QInputDialog::getInt(this, tr("Scribble"),
+                                        tr("Select pen width:"),
+                                        scribbleArea->penWidth(),
+                                        1, 500, 1, &ok);
+    // Change the pen width
+    if (ok)
+        scribbleArea->setPenWidth(newWidth);
+}
+
+// Open an about dialog
+void MainWindow::about()
+{
+    // Window title and text to display
+    QMessageBox::about(this, tr("About Scribble"),
+            tr("<p>The <b>Scribble</b> example is awesome</p>"));
+}
+
+// Define menu actions that call functions
+void MainWindow::createActions()
+{
+    //connect signal and slots of gui element
+    connect(this->clearButton, SIGNAL(clicked()), scribbleArea, SLOT(clearImage()));
+
+    // Create the action tied to the menu
+    openAct = new QAction(tr("&Open..."), this);
+
+    // Define the associated shortcut key
+    openAct->setShortcuts(QKeySequence::Open);
+
+    // Tie the action to MainWindow::open()
+    connect(openAct, SIGNAL(triggered()), this, SLOT(open()));
+
+    // Get a list of the supported file formats
+    // QImageWriter is used to write images to files
+    foreach (QByteArray format, QImageWriter::supportedImageFormats()) {
+        QString text = tr("%1...").arg(QString(format).toUpper());
+
+        // Create an action for each file format
+        QAction *action = new QAction(text, this);
+
+        // Set an action for each file format
+        action->setData(format);
+
+        // When clicked call MainWindow::save()
+        connect(action, SIGNAL(triggered()), this, SLOT(save()));
+
+        // Attach each file format option menu item to Save As
+        saveAsActs.append(action);
+    }
+
+
+    // Create exit action and tie to MainWindow::close()
+    exitAct = new QAction(tr("E&xit"), this);
+    exitAct->setShortcuts(QKeySequence::Quit);
+    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));
+
+    // Create pen color action and tie to MainWindow::penColor()
+    penColorAct = new QAction(tr("&Pen Color..."), this);
+    connect(penColorAct, SIGNAL(triggered()), this, SLOT(penColor()));
+
+    // Create pen width action and tie to MainWindow::penWidth()
+    penWidthAct = new QAction(tr("Pen &Width..."), this);
+    connect(penWidthAct, SIGNAL(triggered()), this, SLOT(penWidth()));
+
+    // Create clear screen action and tie to MainWindow::clearImage()
+    clearScreenAct = new QAction(tr("&Clear Screen"), this);
+    clearScreenAct->setShortcut(tr("Ctrl+L"));
+    connect(clearScreenAct, SIGNAL(triggered()),
+            scribbleArea, SLOT(clearImage()));
+
+    // Create about action and tie to MainWindow::about()
+    aboutAct = new QAction(tr("&About"), this);
+    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));
+
+    // Create about Qt action and tie to MainWindow::aboutQt()
+    aboutQtAct = new QAction(tr("About &Qt"), this);
+    connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
+}
+
+// Create the menubar
+void MainWindow::createMenus()
+{
+    // Create Save As option and the list of file types
+    saveAsMenu = new QMenu(tr("&Save As"), this);
+    foreach (QAction *action, saveAsActs)
+        saveAsMenu->addAction(action);
+
+    // Attach all actions to File
+    fileMenu = new QMenu(tr("&File"), this);
+    fileMenu->addAction(openAct);
+    fileMenu->addMenu(saveAsMenu);
+    fileMenu->addSeparator();
+    fileMenu->addAction(exitAct);
+
+    // Attach all actions to Options
+    optionMenu = new QMenu(tr("&Options"), this);
+    optionMenu->addAction(penColorAct);
+    optionMenu->addAction(penWidthAct);
+    optionMenu->addSeparator();
+    optionMenu->addAction(clearScreenAct);
+
+    // Attach all actions to Help
+    helpMenu = new QMenu(tr("&Help"), this);
+    helpMenu->addAction(aboutAct);
+    helpMenu->addAction(aboutQtAct);
+
+    // Add menu items to the menubar
+    menuBar()->addMenu(fileMenu);
+    menuBar()->addMenu(optionMenu);
+    menuBar()->addMenu(helpMenu);
+}
+
+void MainWindow::createGui(){
+    //create a central widget to work on
+    centralGuiWidget = new QWidget(this);
+    setCentralWidget(centralGuiWidget);
+
+    //create the grid for the layout
+    mainLayout = new QGridLayout(centralGuiWidget);
+    centralGuiWidget->setLayout(mainLayout);
+
+    //create Gui elements
+    clearButton = new QPushButton("Clear");
+    scribbleArea = new ScribbleArea();
+
+    //set gui elemtns position
+    mainLayout->addWidget(scribbleArea,0,0,10,10);
+    mainLayout->addWidget(clearButton,0,10,1,1);
+}
+
+void MainWindow::setIntelliStyle(){
+    // Set the title
+    setWindowTitle("IntelliPhoto Prototype");
+    //set style sheet
+    this->setStyleSheet("background-color:rgb(64,64,64)");
+    this->centralGuiWidget->setStyleSheet("color:rgb(255,255,255)");
+    this->menuBar()->setStyleSheet("color:rgb(255,255,255)");
+}
+
+bool MainWindow::maybeSave()
+{
+    // Check for changes since last save
+    if (scribbleArea->isModified()) {
+       QMessageBox::StandardButton ret;
+
+       // Scribble is the title
+       // Add text and the buttons
+       ret = QMessageBox::warning(this, tr("Scribble"),
+                          tr("The image has been modified.\n"
+                             "Do you want to save your changes?"),
+                          QMessageBox::Save | QMessageBox::Discard
+                          | QMessageBox::Cancel);
+
+       // If save button clicked call for file to be saved
+        if (ret == QMessageBox::Save) {
+            return saveFile("png");
+
+        // If cancel do nothing
+        } else if (ret == QMessageBox::Cancel) {
+            return false;
+        }
+    }
+    return true;
+}
+
+bool MainWindow::saveFile(const QByteArray &fileFormat)
+{
+    // Define path, name and default file type
+    QString initialPath = QDir::currentPath() + "/untitled." + fileFormat;
+
+    // Get selected file from dialog
+    // Add the proper file formats and extensions
+    QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),
+                               initialPath,
+                               tr("%1 Files (*.%2);;All Files (*)")
+                               .arg(QString::fromLatin1(fileFormat.toUpper()))
+                               .arg(QString::fromLatin1(fileFormat)));
+
+    // If no file do nothing
+    if (fileName.isEmpty()) {
+        return false;
+    } else {
+
+        // Call for the file to be saved
+        return scribbleArea->saveImage(fileName, fileFormat.constData());
+    }
+}
+