init commit

graphicsview.cpp

@@ -0,0 +1,59 @@
+#include "graphicsview.h"
+
+#include <QDebug>
+#include <QMouseEvent>
+#include <QScrollBar>
+
+GraphicsView::GraphicsView(QWidget *parent)
+    : QGraphicsView (parent)
+{
+    setDragMode(QGraphicsView::ScrollHandDrag);
+    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    setStyleSheet("background-color: rgba(0, 0, 0, 180);"
+                  "border-radius: 3px;");
+}
+
+void GraphicsView::mousePressEvent(QMouseEvent *event)
+{
+    QGraphicsItem *item = itemAt(event->pos());
+    if (!item) {
+        event->ignore();
+        // blumia: return here, or the QMouseEvent event transparency won't
+        //         work if we set a QGraphicsView::ScrollHandDrag drag mode.
+        return;
+    }
+
+    qDebug() << item;
+
+    return QGraphicsView::mousePressEvent(event);
+}
+
+void GraphicsView::mouseMoveEvent(QMouseEvent *event)
+{
+    QGraphicsItem *item = itemAt(event->pos());
+    if (!item) {
+        event->ignore();
+    }
+
+    return QGraphicsView::mouseMoveEvent(event);
+}
+
+void GraphicsView::mouseReleaseEvent(QMouseEvent *event)
+{
+    QGraphicsItem *item = itemAt(event->pos());
+    if (!item) {
+        event->ignore();
+    }
+
+    return QGraphicsView::mouseReleaseEvent(event);
+}
+
+void GraphicsView::wheelEvent(QWheelEvent *event)
+{
+    if(event->delta() > 0) {
+        scale(1.25, 1.25);
+    } else {
+        scale(0.8, 0.8);
+    }
+}