From 8198e81ec5e77e61291577fe35f0f28d66d23f58 Mon Sep 17 00:00:00 2001
From: taiyunqiang <taiyunqiang@uniontech.com>
Date: Wed, 18 Nov 2020 10:13:35 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E6=BB=9A=E8=BD=AE=E5=8A=9F?=
 =?UTF-8?q?=E8=83=BD?=
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---
 bgdemo/widget.cpp | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/bgdemo/widget.cpp b/bgdemo/widget.cpp
index 4ba1eab..fcf8c34 100644
--- a/bgdemo/widget.cpp
+++ b/bgdemo/widget.cpp
@@ -2,7 +2,8 @@
 #include "ui_widget.h"
 #include "qevent.h"
 #include "qdebug.h"
-
+#include <QTimer>
+#include<QWheelEvent>
 Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget)
 {
     ui->setupUi(this);
@@ -23,6 +24,7 @@ bool Widget::eventFilter(QObject *watched, QEvent *evt)
     static int index = 1;
     static QPoint mousePoint;
     static bool mousePressed = false;
+    static bool is_smooth_scrolling = false;
 
     QMouseEvent *event = static_cast<QMouseEvent *>(evt);
     if (event->type() == QEvent::MouseButtonPress) {
@@ -52,5 +54,29 @@ bool Widget::eventFilter(QObject *watched, QEvent *evt)
         }
     }
 
+    if (event->type()  == QEvent::Wheel) {
+        QWheelEvent *event = static_cast<QWheelEvent *>(evt);
+        if(is_smooth_scrolling == false) {
+          if (event->delta() > 0) {
+              is_smooth_scrolling = true;
+              if (index == 5) {
+                 index = 1;
+              } else {
+                  index++;
+              }
+          } else if (event->delta() < 0) {
+              is_smooth_scrolling = true;
+              if (index != 1) {
+                 index--;
+              } else {
+                  index =5;
+              }
+          }
+          ui->widget->setStyleSheet(QString("background-image:url(:/image/%1.png);").arg(index));
+          QTimer::singleShot(400, [&]() { is_smooth_scrolling = false; });
+          return true;
+        }
+    }
+
     return QWidget::eventFilter(watched, event);
 }