WPF小笔记－Popup拖动

查看了下MSDN发现Popup没有类拟Drag相关的属性和方法，第一时间想了thumb。忙了一会未果，就想起了强大的google。

发现中文资料很少，英文的发现有两篇很不错的，所以笔记在博客园里，希望对园里的朋友有用。

楼主推荐使用social.msdm的方法，试过很好用：

<Popup Name="puSkills" Placement="MousePoint" PopupAnimation="Scroll" AllowsTransparency="True" IsEnabled="True" IsOpen="False">

                        <Border BorderBrush="DarkCyan" BorderThickness="3">

                            <StackPanel Background="AliceBlue" VerticalAlignment="Center" Height="400" Width="400">

                                <Label Name="lblCaption"  FontWeight="Bold" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Foreground="Blue" Background="Blue" MouseLeftButtonDown="lblCaption_MouseLeftButtonDown">Move</Label>

                                <StackPanel>

                                  <TextBlock HorizontalAlignment="Right">

                                       Some Contents...........

                                    </TextBlock>

                                </StackPanel>

                            </StackPanel>

                        </Border>

                    </Popup>

后台CS代码：

 [DllImport("user32.dll")]

        public static extern IntPtr WindowFromPoint(POINT Point);

        [DllImport("user32.dll")]

        [return: MarshalAs(UnmanagedType.Bool)]

        public static extern bool GetCursorPos(out POINT lpPoint);

        [DllImportAttribute("user32.dll")]

        public static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

        [DllImportAttribute("user32.dll")]

        public static extern bool ReleaseCapture();

        [StructLayout(LayoutKind.Sequential)]

        public struct POINT

        {

            public int X;

            public int Y;

        }

        public const int WM_NCLBUTTONDOWN = 0xA1;

        public const int HT_CAPTION = 0x2;

 private void lblCaption_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)

        {

            POINT curPos;

            IntPtr hWndPopup;

            GetCursorPos(out curPos);

            hWndPopup = WindowFromPoint(curPos);

            ReleaseCapture();

            SendMessage(hWndPopup, WM_NCLBUTTONDOWN, new IntPtr(HT_CAPTION), IntPtr.Zero);

        }

Click the Move Content in label.. then move the mouse. Thank you!

巴特西

WPF小笔记－Popup拖动

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