feat: 添加ElaWidgetTool库

ElaWidgetTools/ElaGraphicsView.cpp

@@ -0,0 +1,71 @@
+#include "ElaGraphicsView.h"
+
+#include <QEvent>
+#include <QScrollBar>
+#include <QWheelEvent>
+
+#include "private/ElaGraphicsViewPrivate.h"
+Q_PROPERTY_CREATE_Q_CPP(ElaGraphicsView, qreal, MaxTransform);
+Q_PROPERTY_CREATE_Q_CPP(ElaGraphicsView, qreal, MinTransform);
+ElaGraphicsView::ElaGraphicsView(QWidget* parent)
+    : QGraphicsView(parent), d_ptr(new ElaGraphicsViewPrivate())
+{
+    Q_D(ElaGraphicsView);
+    d->q_ptr = this;
+    d->_pMaxTransform = 5;
+    d->_pMinTransform = 0.15;
+    d->_initStyle();
+    setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
+}
+
+ElaGraphicsView::ElaGraphicsView(QGraphicsScene* scene, QWidget* parent)
+    : QGraphicsView(scene, parent), d_ptr(new ElaGraphicsViewPrivate())
+{
+    Q_D(ElaGraphicsView);
+    d->q_ptr = this;
+    d->_pMaxTransform = 5;
+    d->_pMinTransform = 0.15;
+    d->_initStyle();
+    setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
+}
+
+ElaGraphicsView::~ElaGraphicsView()
+{
+}
+
+void ElaGraphicsView::wheelEvent(QWheelEvent* event)
+{
+    Q_D(ElaGraphicsView);
+    if (event->modifiers() == Qt::CTRL)
+    {
+        // 放大
+        if ((event->angleDelta().y() > 0) && transform().m11() <= d->_pMaxTransform)
+        {
+            this->scale(1.1, 1.1);
+        }
+        else if ((event->angleDelta().y() < 0) && transform().m11() >= d->_pMinTransform)
+        {
+            this->scale(1.0 / 1.1, 1.0 / 1.1);
+        }
+        return;
+    }
+    QGraphicsView::wheelEvent(event);
+}
+
+void ElaGraphicsView::keyPressEvent(QKeyEvent* event)
+{
+    if (event->key() == Qt::Key_Alt)
+    {
+        setDragMode(QGraphicsView::ScrollHandDrag);
+    }
+    QGraphicsView::keyPressEvent(event);
+}
+
+void ElaGraphicsView::keyReleaseEvent(QKeyEvent* event)
+{
+    if (event->key() == Qt::Key_Alt)
+    {
+        setDragMode(QGraphicsView::RubberBandDrag);
+    }
+    QGraphicsView::keyReleaseEvent(event);
+}