Implemented actions widget and editing functionalities

widgets/drawingcanvaswidget.cpp

@@ -0,0 +1,59 @@
+#include "drawingcanvaswidget.h"
+
+#include <QPixmap>
+#include <QPainter>
+
+DrawingCanvasWidget::DrawingCanvasWidget(QWidget *parent) :
+    QWidget{parent}
+{
+}
+
+void DrawingCanvasWidget::setPixmap(QPixmap &pixmap)
+{
+    m_pixmap = &pixmap;
+    setFixedSize(m_pixmap->size() * m_scale);
+    update();
+}
+
+void DrawingCanvasWidget::setScale(float scale)
+{
+    if (m_scale == scale)
+        return;
+    emit scaleChanged(m_scale = scale);
+    if (m_pixmap)
+        setFixedSize(m_pixmap->size() * m_scale);
+    update();
+}
+
+void DrawingCanvasWidget::paintEvent(QPaintEvent *ev)
+{
+    if (!m_pixmap)
+    {
+        QWidget::paintEvent(ev);
+        return;
+    }
+
+    QBrush brush;
+    {
+        QPixmap pixmap{32, 32};
+        {
+            QPainter painter{&pixmap};
+            painter.setPen(Qt::NoPen);
+            painter.setBrush(Qt::gray);
+            painter.drawRect(0, 0, 16, 16);
+            painter.drawRect(16, 16, 16, 16);
+            painter.setBrush(Qt::white);
+            painter.drawRect(0, 16, 16, 16);
+            painter.drawRect(16, 0, 16, 16);
+        }
+        brush.setTexture(std::move(pixmap));
+    }
+
+    QPainter painter{this};
+
+    painter.setPen(Qt::NoPen);
+    painter.setBrush(std::move(brush));
+    painter.drawRect(rect());
+
+    painter.drawPixmap(rect(), *m_pixmap);
+}