diff --git a/.settings/org.eclipse.core.resources.prefs b/.settings/org.eclipse.core.resources.prefs
index 6f22d22..7439a6e 100644
--- a/.settings/org.eclipse.core.resources.prefs
+++ b/.settings/org.eclipse.core.resources.prefs
@@ -4,7 +4,9 @@ encoding//Demo/CircleLine.py=utf-8
 encoding//Demo/EmbedWindow.py=utf-8
 encoding//Demo/FacePoints.py=utf-8
 encoding//Demo/FollowWindow.py=utf-8
+encoding//Demo/FramelessDialog.py=utf-8
 encoding//Demo/FramelessWindow.py=utf-8
+encoding//Demo/IsSignalConnected.py=utf-8
 encoding//Demo/Lib/Application.py=utf-8
 encoding//Demo/Lib/FramelessWindow.py=utf-8
 encoding//Demo/NativeEvent.py=utf-8
@@ -13,6 +15,7 @@ encoding//Demo/ProbeWindow.py=utf-8
 encoding//Demo/QtThreading.py=utf-8
 encoding//Demo/RestartWindow.py=utf-8
 encoding//Demo/SharedMemory.py=utf-8
+encoding//Demo/ShowFrameWhenDrag.py=utf-8
 encoding//Demo/SingleApplication.py=utf-8
 encoding//Demo/VerificationCode.py=utf-8
 encoding//Demo/WeltHideWindow.py=utf-8
diff --git a/Demo/FramelessDialog.py b/Demo/FramelessDialog.py
new file mode 100644
index 0000000..4f3d551
--- /dev/null
+++ b/Demo/FramelessDialog.py
@@ -0,0 +1,85 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Created on 2019年4月19日
+@author: Irony
+@site: https://pyqt5.com https://github.com/892768447
+@email: 892768447@qq.com
+@file: FramelessDialog
+@description: 无边框圆角对话框 
+"""
+from PyQt5.QtCore import Qt, QSize, QTimer
+from PyQt5.QtWidgets import QDialog, QVBoxLayout, QWidget,\
+    QGraphicsDropShadowEffect, QPushButton, QGridLayout, QSpacerItem,\
+    QSizePolicy
+
+
+__Author__ = "Irony"
+__Copyright__ = 'Copyright (c) 2019 Irony'
+__Version__ = 1.0
+
+Stylesheet = """
+#Custom_Widget {
+    background: white;
+    border-radius: 10px;
+}
+
+#closeButton {
+    min-width: 36px;
+    min-height: 36px;
+    font-family: "Webdings";
+    qproperty-text: "r";
+    border-radius: 10px;
+}
+#closeButton:hover {
+    color: white;
+    background: red;
+}
+"""
+
+
+class Dialog(QDialog):
+
+    def __init__(self, *args, **kwargs):
+        super(Dialog, self).__init__(*args, **kwargs)
+        self.setObjectName('Custom_Dialog')
+        self.setWindowFlags(self.windowFlags() | Qt.FramelessWindowHint)
+        self.setAttribute(Qt.WA_TranslucentBackground, True)
+        self.setStyleSheet(Stylesheet)
+        self.initUi()
+        # 添加阴影
+        effect = QGraphicsDropShadowEffect(self)
+        effect.setBlurRadius(12)
+        effect.setOffset(0, 0)
+        effect.setColor(Qt.gray)
+        self.setGraphicsEffect(effect)
+
+    def initUi(self):
+        layout = QVBoxLayout(self)
+        # 重点： 这个widget作为背景和圆角
+        self.widget = QWidget(self)
+        self.widget.setObjectName('Custom_Widget')
+        layout.addWidget(self.widget)
+
+        # 在widget中添加ui
+        layout = QGridLayout(self.widget)
+        layout.addItem(QSpacerItem(
+            40, 20, QSizePolicy.Expanding, QSizePolicy.Minimum), 0, 0)
+        layout.addWidget(QPushButton(
+            'r', self, clicked=self.accept, objectName='closeButton'), 0, 1)
+        layout.addItem(QSpacerItem(20, 40, QSizePolicy.Minimum,
+                                   QSizePolicy.Expanding), 1, 0)
+
+    def sizeHint(self):
+        return QSize(600, 400)
+
+
+if __name__ == '__main__':
+    import sys
+    from PyQt5.QtWidgets import QApplication
+    app = QApplication(sys.argv)
+    w = Dialog()
+    w.exec_()
+    QTimer.singleShot(200, app.quit)
+    sys.exit(app.exec_())
diff --git a/Demo/IsSignalConnected.py b/Demo/IsSignalConnected.py
new file mode 100644
index 0000000..4dbb19e
--- /dev/null
+++ b/Demo/IsSignalConnected.py
@@ -0,0 +1,63 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Created on 2019年2月24日
+@author: Irony
+@site: https://pyqt5.com https://github.com/892768447
+@email: 892768447@qq.com
+@file: IsSignalConnected
+@description: 判断信号是否连接
+"""
+
+from PyQt5.QtWidgets import QWidget, QVBoxLayout, QPushButton, QTextBrowser
+
+
+__Author__ = """By: Irony
+QQ: 892768447
+Email: 892768447@qq.com"""
+__Copyright__ = 'Copyright (c) 2019 Irony'
+__Version__ = 1.0
+
+
+class Window(QWidget):
+
+    def __init__(self, *args, **kwargs):
+        super(Window, self).__init__(*args, **kwargs)
+        layout = QVBoxLayout(self)
+        self.button1 = QPushButton('已连接', self, clicked=self.doTest)
+        self.button2 = QPushButton('未连接', self)
+        self.retView = QTextBrowser(self)
+        layout.addWidget(self.button1)
+        layout.addWidget(self.button2)
+        layout.addWidget(self.retView)
+
+    def doTest(self):
+        self.retView.append("""
+        # button1 clicked 是否连接: %s
+        # button2 clicked 是否连接: %s
+        """ % (
+            self.isSignalConnected(self.button1, 'clicked()'),
+            self.isSignalConnected(self.button2, 'clicked()')
+        ))
+
+    def isSignalConnected(self, obj, name):
+        """判断信号是否连接
+        :param obj:        对象
+        :param name:       信号名，如 clicked()
+        """
+        index = obj.metaObject().indexOfMethod(name)
+        if index > -1:
+            method = obj.metaObject().method(index)
+            if method:
+                return obj.isSignalConnected(method)
+        return False
+
+
+if __name__ == '__main__':
+    import sys
+    from PyQt5.QtWidgets import QApplication
+    app = QApplication(sys.argv)
+    w = Window()
+    w.show()
+    sys.exit(app.exec_())
diff --git a/Demo/README.md b/Demo/README.md
index c983c2f..00ed0be 100644
--- a/Demo/README.md
+++ b/Demo/README.md
@@ -17,6 +17,9 @@
   - [人脸特征点](#15、人脸特征点)
   - [使用Threading](#16、使用Threading)
   - [背景连线动画](#17、背景连线动画)
+  - [无边框圆角对话框](#18、无边框圆角对话框)
+  - [调整窗口显示边框](#19、调整窗口显示边框)
+  - [判断信号是否连接](#20、判断信号是否连接)
 
 ## 1、重启窗口Widget
 [运行 RestartWindow.py](RestartWindow.py)
@@ -170,4 +173,33 @@ PyQt 结合 Opencv 进行人脸检测；
 
 主要参考 [背景连线动画.html](Data/背景连线动画.html)
 
-![CircleLine](ScreenShot/CircleLine.gif)
\ No newline at end of file
+![CircleLine](ScreenShot/CircleLine.gif)
+
+
+## 18、无边框圆角对话框
+[运行 FramelessDialog.py](FramelessDialog.py)
+
+1. 通过设置 `self.setWindowFlags(self.windowFlags() | Qt.FramelessWindowHint)` 和 `self.setAttribute(Qt.WA_TranslucentBackground, True)` 达到无边框和背景透明
+2. 在QDialog中放置一个QWidget作为背景和圆角
+3. 在QWidget中放置其他内容
+
+![FramelessDialog](ScreenShot/FramelessDialog.png)
+
+## 19、调整窗口显示边框
+[运行 ShowFrameWhenDrag.py](ShowFrameWhenDrag.py)
+
+1. 全局设置是【】在控制面板中->调整Windows的外观和性能->去掉勾选 拖动时显示窗口内容】
+2. 但是为了不影响其它应用,可以在窗口处理函数wndproc中对其进行判断处理
+3. 必须先要替换wndproc为自己的函数
+4. 当消息事件==WM_NCLBUTTONDOWN的时候, 先强制开启，然后处理完成后再还原
+
+好处在于可以减少窗口更新的次数（用途有频繁渲染的界面）
+
+![ShowFrameWhenDrag](ScreenShot/ShowFrameWhenDrag.gif)
+
+## 20、判断信号是否连接
+[运行 IsSignalConnected.py](IsSignalConnected.py)
+
+通过 `isSignalConnected` 判断是否连接
+
+![IsSignalConnected](ScreenShot/IsSignalConnected.png)
\ No newline at end of file
diff --git a/Demo/ScreenShot/FramelessDialog.png b/Demo/ScreenShot/FramelessDialog.png
new file mode 100644
index 0000000..a5d24a3
Binary files /dev/null and b/Demo/ScreenShot/FramelessDialog.png differ
diff --git a/Demo/ScreenShot/IsSignalConnected.png b/Demo/ScreenShot/IsSignalConnected.png
new file mode 100644
index 0000000..e87aaef
Binary files /dev/null and b/Demo/ScreenShot/IsSignalConnected.png differ
diff --git a/Demo/ScreenShot/ShowFrameWhenDrag.gif b/Demo/ScreenShot/ShowFrameWhenDrag.gif
new file mode 100644
index 0000000..b06c3e4
Binary files /dev/null and b/Demo/ScreenShot/ShowFrameWhenDrag.gif differ
diff --git a/Demo/ShowFrameWhenDrag.py b/Demo/ShowFrameWhenDrag.py
new file mode 100644
index 0000000..a7c986e
--- /dev/null
+++ b/Demo/ShowFrameWhenDrag.py
@@ -0,0 +1,89 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Created on 2019年4月23日
+@author: Irony
+@site: https://pyqt5.com https://github.com/892768447
+@email: 892768447@qq.com
+@file: ShowFrameWhenDrag
+@description: 调整窗口显示边框
+"""
+from ctypes import sizeof, windll, c_int, byref, c_long, c_void_p, c_ulong, c_longlong,\
+    c_ulonglong, WINFUNCTYPE, c_uint
+
+from PyQt5.QtWidgets import QWidget, QVBoxLayout, QLabel
+
+
+__Author__ = 'Irony'
+__Copyright__ = 'Copyright (c) 2019 Irony'
+__Version__ = 1.0
+
+if sizeof(c_long) == sizeof(c_void_p):
+    WPARAM = c_ulong
+    LPARAM = c_long
+elif sizeof(c_longlong) == sizeof(c_void_p):
+    WPARAM = c_ulonglong
+    LPARAM = c_longlong
+
+WM_NCLBUTTONDOWN = 0x00a1
+GWL_WNDPROC = -4
+SPI_GETDRAGFULLWINDOWS = 38
+SPI_SETDRAGFULLWINDOWS = 37
+WNDPROC = WINFUNCTYPE(c_long, c_void_p, c_uint, WPARAM, LPARAM)
+
+try:
+    CallWindowProc = windll.user32.CallWindowProcW
+    SetWindowLong = windll.user32.SetWindowLongW
+    SystemParametersInfo = windll.user32.SystemParametersInfoW
+except:
+    CallWindowProc = windll.user32.CallWindowProcA
+    SetWindowLong = windll.user32.SetWindowLongA
+    SystemParametersInfo = windll.user32.SystemParametersInfoA
+
+
+def GetDragFullwindows():
+    rv = c_int()
+    SystemParametersInfo(SPI_GETDRAGFULLWINDOWS, 0, byref(rv), 0)
+    return rv.value
+
+
+def SetDragFullwindows(value):
+    SystemParametersInfo(SPI_SETDRAGFULLWINDOWS, value, 0, 0)
+
+
+class Window(QWidget):
+
+    def __init__(self, *args, **kwargs):
+        super(Window, self).__init__(*args, **kwargs)
+        layout = QVBoxLayout(self)
+        layout.addWidget(QLabel('拖动或者调整窗口试试看'))
+
+        # 重点替换窗口处理过程
+        self._newwndproc = WNDPROC(self._wndproc)
+        self._oldwndproc = SetWindowLong(
+            int(self.winId()), GWL_WNDPROC, self._newwndproc)
+
+    def _wndproc(self, hwnd, msg, wparam, lparam):
+        if msg == WM_NCLBUTTONDOWN:
+            # 获取系统本身是否已经开启
+            isDragFullWindow = GetDragFullwindows()
+            if isDragFullWindow != 0:
+                # 开启虚线框
+                SetDragFullwindows(0)
+                # 系统本身处理
+                ret = CallWindowProc(
+                    self._oldwndproc, hwnd, msg, wparam, lparam)
+                # 关闭虚线框
+                SetDragFullwindows(1)
+                return ret
+        return CallWindowProc(self._oldwndproc, hwnd, msg, wparam, lparam)
+
+
+if __name__ == '__main__':
+    import sys
+    from PyQt5.QtWidgets import QApplication
+    app = QApplication(sys.argv)
+    w = Window()
+    w.show()
+    sys.exit(app.exec_())
diff --git a/README.md b/README.md
index 8bc28ba..0f4eed4 100644
--- a/README.md
+++ b/README.md
@@ -167,7 +167,9 @@ https://pyqt5.com 社区是专门针对PyQt5学习和提升开设的博客网站
   - [简单的窗口贴边隐藏](Demo/WeltHideWindow.py)
   - [嵌入外部窗口](Demo/EmbedWindow.py)
   - [简单跟随其它窗口](Demo/FollowWindow.py)
+  - [调整窗口显示边框](Demo/ShowFrameWhenDrag.py)
   - [简单探测窗口和放大截图](Demo/ProbeWindow.py)
+  - [无边框圆角对话框](Demo/FramelessDialog.py)
   - [无边框自定义标题栏窗口](Demo/FramelessWindow.py)
   - [右下角弹出框](Demo/WindowNotify.py)
   - [程序重启](Demo/AutoRestart.py)
@@ -180,6 +182,7 @@ https://pyqt5.com 社区是专门针对PyQt5学习和提升开设的博客网站
   - [人脸特征点](Demo/FacePoints.py)
   - [使用Threading](Demo/QtThreading.py)
   - [背景连线动画](Demo/CircleLine.py)
+  - [判断信号是否连接](Demo/IsSignalConnected.py)
 
 # QQ群