editor ui and icons

src/notepad.cpp

+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <iostream>
+#include <QFile>
+#include <QFileDialog>
+#include <QTextStream>
+#include <QMessageBox>
+#if defined(QT_PRINTSUPPORT_LIB)
+#include <QtPrintSupport/qtprintsupportglobal.h>
+#if QT_CONFIG(printer)
+#if QT_CONFIG(printdialog)
+#include <QPrintDialog>
+#endif // QT_CONFIG(printdialog)
+#include <QPrinter>
+#endif // QT_CONFIG(printer)
+#endif // QT_PRINTSUPPORT_LIB
+#include <QKeyEvent>
+#include <QFont>
+#include <QFontDialog>
+
+#include "notepad.h"
+#include "ui_notepad.h"
+
+Notepad::Notepad(QWidget *parent) :
+    QMainWindow(parent),
+    ui(new Ui::Notepad)
+{
+    ui->setupUi(this);
+    this->setCentralWidget(ui->textEdit);
+    this->ui->textEdit->installEventFilter(this);
+
+    connect(ui->actionNew, &QAction::triggered, this, &Notepad::newDocument);
+    connect(ui->actionOpen, &QAction::triggered, this, &Notepad::open);
+    connect(ui->actionSave, &QAction::triggered, this, &Notepad::save);
+    connect(ui->actionSave_as, &QAction::triggered, this, &Notepad::saveAs);
+    connect(ui->actionPrint, &QAction::triggered, this, &Notepad::print);
+    connect(ui->actionExit, &QAction::triggered, this, &Notepad::exit);
+    connect(ui->actionCopy, &QAction::triggered, this, &Notepad::copy);
+    connect(ui->actionCut, &QAction::triggered, this, &Notepad::cut);
+    connect(ui->actionPaste, &QAction::triggered, this, &Notepad::paste);
+    connect(ui->actionUndo, &QAction::triggered, this, &Notepad::undo);
+    connect(ui->actionRedo, &QAction::triggered, this, &Notepad::redo);
+    connect(ui->actionFont, &QAction::triggered, this, &Notepad::selectFont);
+    connect(ui->actionBold, &QAction::triggered, this, &Notepad::setFontBold);
+    connect(ui->actionUnderline, &QAction::triggered, this, &Notepad::setFontUnderline);
+    connect(ui->actionItalic, &QAction::triggered, this, &Notepad::setFontItalic);
+    connect(ui->actionAbout, &QAction::triggered, this, &Notepad::about);
+
+
+// Disable menu actions for unavailable features
+#if !QT_CONFIG(printer)
+    ui->actionPrint->setEnabled(false);
+#endif
+
+#if !QT_CONFIG(clipboard)
+    ui->actionCut->setEnabled(false);
+    ui->actionCopy->setEnabled(false);
+    ui->actionPaste->setEnabled(false);
+#endif
+}
+
+Notepad::~Notepad()
+{
+    delete ui;
+}
+
+void Notepad::newDocument()
+{
+    currentFile.clear();
+    ui->textEdit->setText(QString());
+}
+
+void Notepad::open()
+{
+    QString fileName = QFileDialog::getOpenFileName(this, "Open the file");
+    QFile file(fileName);
+    currentFile = fileName;
+    if (!file.open(QIODevice::ReadOnly | QFile::Text)) {
+        QMessageBox::warning(this, "Warning", "Cannot open file: " + file.errorString());
+        return;
+    }
+    setWindowTitle(fileName);
+    QTextStream in(&file);
+    QString text = in.readAll();
+    ui->textEdit->setText(text);
+    file.close();
+}
+
+void Notepad::save()
+{
+    QString fileName;
+    // If we don't have a filename from before, get one.
+    if (currentFile.isEmpty()) {
+        fileName = QFileDialog::getSaveFileName(this, "Save");
+        currentFile = fileName;
+    } else {
+        fileName = currentFile;
+    }
+    QFile file(fileName);
+    if (!file.open(QIODevice::WriteOnly | QFile::Text)) {
+        QMessageBox::warning(this, "Warning", "Cannot save file: " + file.errorString());
+        return;
+    }
+    setWindowTitle(fileName);
+    QTextStream out(&file);
+    QString text = ui->textEdit->toPlainText();
+    out << text;
+    file.close();
+}
+
+void Notepad::saveAs()
+{
+    QString fileName = QFileDialog::getSaveFileName(this, "Save as");
+    QFile file(fileName);
+
+    if (!file.open(QFile::WriteOnly | QFile::Text)) {
+        QMessageBox::warning(this, "Warning", "Cannot save file: " + file.errorString());
+        return;
+    }
+    currentFile = fileName;
+    setWindowTitle(fileName);
+    QTextStream out(&file);
+    QString text = ui->textEdit->toPlainText();
+    out << text;
+    file.close();
+}
+
+void Notepad::print()
+{
+#if QT_CONFIG(printer)
+    QPrinter printDev;
+#if QT_CONFIG(printdialog)
+    QPrintDialog dialog(&printDev, this);
+    if (dialog.exec() == QDialog::Rejected)
+        return;
+#endif // QT_CONFIG(printdialog)
+    ui->textEdit->print(&printDev);
+#endif // QT_CONFIG(printer)
+}
+
+void Notepad::exit()
+{
+    QCoreApplication::quit();
+}
+
+void Notepad::copy()
+{
+#if QT_CONFIG(clipboard)
+    ui->textEdit->copy();
+#endif
+}
+
+void Notepad::cut()
+{
+#if QT_CONFIG(clipboard)
+    ui->textEdit->cut();
+#endif
+}
+
+void Notepad::paste()
+{
+#if QT_CONFIG(clipboard)
+    ui->textEdit->paste();
+#endif
+}
+
+void Notepad::undo()
+{
+     ui->textEdit->undo();
+}
+
+void Notepad::redo()
+{
+    ui->textEdit->redo();
+}
+
+void Notepad::selectFont()
+{
+    bool fontSelected;
+    QFont font = QFontDialog::getFont(&fontSelected, this);
+    if (fontSelected)
+        ui->textEdit->setFont(font);
+}
+
+void Notepad::setFontUnderline(bool underline)
+{
+    ui->textEdit->setFontUnderline(underline);
+}
+
+void Notepad::setFontItalic(bool italic)
+{
+    ui->textEdit->setFontItalic(italic);
+}
+
+void Notepad::setFontBold(bool bold)
+{
+    bold ? ui->textEdit->setFontWeight(QFont::Bold) :
+           ui->textEdit->setFontWeight(QFont::Normal);
+}
+
+void Notepad::about()
+{
+   QMessageBox::about(this, tr("About MDI"),
+                tr("The <b>Notepad</b> example demonstrates how to code a basic "
+                   "text editor using QtWidgets"));
+
+}
+
+bool Notepad::eventFilter(QObject *obj, QEvent *event) {
+    if (obj == this->ui->textEdit) {
+        if (event->type() == QEvent::KeyPress) {
+            QKeyEvent *keyEvent = static_cast<QKeyEvent*>(event);
+            keyPressEvent(keyEvent);
+            return true;
+        } else {
+            return false;
+        }
+    } else {
+        // pass the event on to the parent class
+        return QMainWindow::eventFilter(obj, event);
+    }
+}
+
+void Notepad::keyPressEvent(QKeyEvent *ke) {
+    CRDT event;
+    QKeyEvent e = *ke;
+    int cursorPosition = ui->textEdit->textCursor().position();
+
+    if(e.key() == Qt::Key_Backspace && cursorPosition != 0) {
+        event.setCommand('D');
+        std::string text = this->ui->textEdit->toPlainText().toStdString();
+        event.setValue(text[cursorPosition-1]);
+    } else if(e.key() >= Qt::Key_Left && e.key() <= Qt::Key_Down) {
+        event.setCommand('M');
+        event.setValue(convertMoveToChar(e.key()));
+    } else {
+        event.setCommand('I');
+        event.setValue(e.text().toStdString().c_str()[0]);
+    }
+
+    emit keyPressed(event, cursorPosition);
+}
+
+char Notepad::convertMoveToChar(int key) {
+    switch (key) {
+        case Qt::Key_Left : return 'L';
+        case Qt::Key_Right : return 'R';
+        case Qt::Key_Up : return 'U';
+        case Qt::Key_Down : return 'D';
+    }
+
+    return '0';
+}
+
+void Notepad::keyReleaseEvent(QKeyEvent *e) {
+//    QMainWindow::keyReleaseEvent(e);
+
+}
+
+void Notepad::setText(QString text)
+{
+    this->ui->textEdit->setText(text);
+}
+
+void Notepad::setCursorPosition(int position) {
+    this->ui->textEdit->moveCursor(QTextCursor::Start, QTextCursor::MoveAnchor);
+    for(int i = 0; i < position; i++){
+        this->ui->textEdit->moveCursor(QTextCursor::Right, QTextCursor::MoveAnchor);
+    }
+}

src/notepad.h

+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef NOTEPAD_H
+#define NOTEPAD_H
+
+//! [all]
+//! [1]
+#include <QMainWindow>
+#include "crdt.h"
+//! [1]
+
+//! [2]
+QT_BEGIN_NAMESPACE
+namespace Ui {
+class Notepad;
+}
+QT_END_NAMESPACE
+//! [2]
+
+//! [3]
+class Notepad : public QMainWindow
+{
+    Q_OBJECT
+//! [3]
+
+//! [4]
+public:
+    explicit Notepad(QWidget *parent = 0);
+//! [4]
+//! [5]
+    ~Notepad();
+//! [5]
+
+private:
+    void keyPressEvent(QKeyEvent *);
+
+    void keyReleaseEvent(QKeyEvent *);
+
+    bool eventFilter(QObject *, QEvent *);
+
+signals:
+    void keyPressed(CRDT data, int cursorPosition);
+
+public slots:
+    void setText(QString text);
+    void setCursorPosition(int idx);
+
+private slots:
+    void newDocument();
+
+    void open();
+
+    void save();
+
+    void saveAs();
+
+    void print();
+
+    void exit();
+
+    void copy();
+
+    void cut();
+
+    void paste();
+
+    void undo();
+
+    void redo();
+
+    void selectFont();
+
+    void setFontBold(bool bold);
+
+    void setFontUnderline(bool underline);
+
+    void setFontItalic(bool italic);
+
+    void about();
+
+//! [6]
+private:
+    Ui::Notepad *ui;
+    QString currentFile;
+    char convertMoveToChar(int move);
+//! [6]
+};
+//! [all]
+
+#endif // NOTEPAD_H