PDF draw widget (first part)

PdfForQtLib/sources/pdfdrawwidget.cpp

@@ -0,0 +1,119 @@
+//    Copyright (C) 2018 Jakub Melka
+//
+//    This file is part of PdfForQt.
+//
+//    PdfForQt is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    (at your option) any later version.
+//
+//    PdfForQt is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDFForQt.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "pdfdrawwidget.h"
+#include "pdfdrawspacecontroller.h"
+
+#include <QPainter>
+#include <QGridLayout>
+#include <QKeyEvent>
+
+namespace pdf
+{
+
+PDFWidget::PDFWidget(QWidget* parent) :
+    QWidget(parent),
+    m_drawWidget(nullptr),
+    m_horizontalScrollBar(nullptr),
+    m_verticalScrollBar(nullptr),
+    m_proxy(nullptr)
+{
+    m_drawWidget = new PDFDrawWidget(this, this);
+    m_horizontalScrollBar = new QScrollBar(Qt::Horizontal, this);
+    m_verticalScrollBar = new QScrollBar(Qt::Vertical, this);
+
+    QGridLayout* layout = new QGridLayout(this);
+    layout->setSpacing(0);
+    layout->addWidget(m_drawWidget, 0, 0);
+    layout->addWidget(m_horizontalScrollBar, 1, 0);
+    layout->addWidget(m_verticalScrollBar, 0, 1);
+    layout->setMargin(0);
+
+    setLayout(layout);
+    setFocusProxy(m_drawWidget);
+
+    m_proxy = new PDFDrawWidgetProxy(this);
+    m_proxy->init(this);
+}
+
+PDFWidget::~PDFWidget()
+{
+
+}
+
+void PDFWidget::setDocument(const PDFDocument* document)
+{
+    m_proxy->setDocument(document);
+}
+
+PDFDrawWidget::PDFDrawWidget(PDFWidget* widget, QWidget* parent) :
+    QWidget(parent),
+    m_widget(widget)
+{
+    setFocusPolicy(Qt::StrongFocus);
+}
+
+PDFDrawWidget::~PDFDrawWidget()
+{
+
+}
+
+QSize PDFDrawWidget::minimumSizeHint() const
+{
+    return QSize(200, 200);
+}
+
+void PDFDrawWidget::paintEvent(QPaintEvent* event)
+{
+    Q_UNUSED(event);
+
+    QPainter painter(this);
+    m_widget->getDrawWidgetProxy()->draw(&painter, this->rect());
+}
+
+void PDFDrawWidget::resizeEvent(QResizeEvent* event)
+{
+    QWidget::resizeEvent(event);
+
+    m_widget->getDrawWidgetProxy()->update();
+}
+
+void PDFDrawWidget::keyPressEvent(QKeyEvent* event)
+{
+    QScrollBar* verticalScrollbar = m_widget->getVerticalScrollbar();
+
+    // Vertical navigation
+    if (verticalScrollbar->isVisible())
+    {
+        if (event->matches(QKeySequence::MoveToStartOfDocument))
+        {
+            verticalScrollbar->setValue(0);
+        }
+        else if (event->matches(QKeySequence::MoveToEndOfDocument))
+        {
+            verticalScrollbar->setValue(verticalScrollbar->maximum());
+        }
+        else if (event->matches(QKeySequence::MoveToNextPage))
+        {
+            verticalScrollbar->setValue(verticalScrollbar->value() + verticalScrollbar->pageStep());
+        }
+    }
+
+    event->accept();
+}
+
+}   // namespace pdf