修正大量demo

screenwidget/frmscreenwidget.cpp

@@ -0,0 +1,18 @@
+#include "frmscreenwidget.h"
+#include "ui_frmscreenwidget.h"
+#include "screenwidget.h"
+
+frmScreenWidget::frmScreenWidget(QWidget *parent) : QWidget(parent), ui(new Ui::frmScreenWidget)
+{
+    ui->setupUi(this);
+}
+
+frmScreenWidget::~frmScreenWidget()
+{
+    delete ui;
+}
+
+void frmScreenWidget::on_pushButton_clicked()
+{
+    ScreenWidget::Instance()->showFullScreen();
+}