first commit

scene/myview.cpp

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+#include "myview.h"
+#include <QWheelEvent>
+#include "picscene.h"
+#include <QDebug>
+MyView::MyView(QWidget *parent) :
+    QGraphicsView(parent)
+{
+    zoomRatio = 1;
+    //setDragMode(QGraphicsView::ScrollHandDrag);//手型拖动
+    //setAlignment(Qt::AlignLeft | Qt::AlignTop);
+    //setFocusPolicy( Qt::NoFocus );
+}
+// static float a = 1.615;
+static float a = 1.64;
+void MyView::ZoomOut(void)
+{
+    if(zoomRatio < 6)
+    {
+        zoomRatio++;
+//        scale(2,2);
+        scale(a,a);
+    }
+}
+
+void MyView::ZoomIn(void)
+{
+    if(zoomRatio > 2)
+    {
+        zoomRatio--;
+        scale(1/a,1/a);
+    }
+}
+
+//void MyView::wheelEvent(QWheelEvent*event)  //滚轮事件
+//{
+////   if(event->delta() > 0)  //如果鼠标滚轮远离使用者，则delta()返回正值
+////       scale(0.5,0.5);  //视图缩放
+////   else scale(2,2);
+//}
+
+
+//void MyView::mousePressEvent(QMouseEvent*event)
+//{
+////   rotate(90);  //视图旋转顺时针90度
+//}
+
+void MyView::keyPressEvent(QKeyEvent *event)
+{
+    //event->accept();
+    //parent()->event((QEvent*) event);
+    if (event->key() == Qt::Key_Left || event->key() == Qt::Key_Right || event->key() == Qt::Key_Up || event->key() == Qt::Key_Down)
+    {
+               // 处理上下键事件
+               PicScene* picScene = dynamic_cast<PicScene*>(this->scene());
+               if(picScene)
+               {
+                    picScene->keyPressEvent(event);
+               }
+     }
+     else
+     {
+               // 其他键事件交给父类处理
+               QGraphicsView::keyPressEvent(event);
+     }
+}