fix: 任务栏没有屏蔽多指功能

通过重写application的notify函数，拦截触屏事件，判断触屏点个数，触点个数大于1时屏蔽事件处理

Log: 屏蔽任务栏默认的多指功能
Bug: https://pms.uniontech.com/zentao/bug-view-46287.html
Change-Id: Ic0fa6187be283d2e8149dc74d4c7ca642ece9a4e
Reviewed-on: http://gerrit.uniontech.com/c/dde-dock/+/4051
Reviewed-by: <mailman@uniontech.com>
Reviewed-by: wangwei <wangwei@uniontech.com>
Reviewed-by: fanpengcheng <fanpengcheng@uniontech.com>
Tested-by: <mailman@uniontech.com>

frame/util/dockapplication.cpp

@@ -2,6 +2,7 @@
 #include "constants.h"
 
 #include <QMouseEvent>
+#include <QTouchEvent>
 
 DockApplication::DockApplication(int &argc, char **argv) : DApplication (argc, argv)
 {
@@ -15,5 +16,11 @@ bool DockApplication::notify(QObject *obj, QEvent *event)
         qApp->setProperty(IS_TOUCH_STATE, (mouseEvent->source() == Qt::MouseEventSynthesizedByQt));
     }
 
+    // 任务栏屏蔽多指触控
+    QTouchEvent *touchEvent = dynamic_cast<QTouchEvent *>(event);
+    if(touchEvent && (touchEvent->touchPoints().size() > 1)) {
+        return true;
+    }
+
     return DApplication::notify(obj, event);
 }

frame/util/dockapplication.h

@@ -41,10 +41,6 @@ class DockApplication : public DApplication
 public:
     explicit DockApplication(int &argc, char **argv);
     virtual bool notify(QObject *obj, QEvent *event) override;
-
-signals:
-
-public slots:
 };
 
 #endif // DOCKAPPLICATION_H