Added CanvasWidget

CMakeLists.txt

@@ -1,6 +1,12 @@
 project(DbGuiLib)
 
+find_package(Qt5Core CONFIG REQUIRED)
+find_package(Qt5Gui CONFIG REQUIRED)
+find_package(Qt5Widgets CONFIG REQUIRED)
+find_package(Qt5LinguistTools CONFIG REQUIRED)
+
 set(HEADERS
+    canvaswidget.h
     dbguilib_global.h
     editorfactory.h
     ledindicator.h
@@ -15,6 +21,7 @@ set(HEADERS
 )
 
 set(SOURCES
+    canvaswidget.cpp
     editorfactory.cpp
     ledindicator.cpp
     matrix4x4widget.cpp

canvaswidget.cpp

@@ -0,0 +1,30 @@
+#include "canvaswidget.h"
+
+// Qt includes
+#include <QPainter>
+
+CanvasWidget::CanvasWidget(QWidget *parent) :
+    QWidget(parent)
+{
+}
+
+void CanvasWidget::setImage(const QImage &image)
+{
+    m_image = image;
+    repaint();
+}
+
+void CanvasWidget::paintEvent(QPaintEvent *event)
+{
+    Q_UNUSED(event)
+
+    const double scale = std::min(double(width()) / m_image.width(),
+                                  double(height()) / m_image.height());
+
+    const QRect imageRect(QPoint(), m_image.size() * scale);
+
+    QPainter painter;
+    painter.begin(this);
+    painter.drawImage(imageRect, m_image);
+    painter.end();
+}

canvaswidget.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "dbguilib_global.h"
+#include <QWidget>
+
+#include <QImage>
+
+class DBGUILIB_EXPORT CanvasWidget : public QWidget
+{
+public:
+    explicit CanvasWidget(QWidget *parent = Q_NULLPTR);
+
+public Q_SLOTS:
+    void setImage(const QImage &image);
+
+protected:
+    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
+
+private:
+    QImage m_image;
+};