DotNet 4.8.1 build of DotNetBar

PROMS/DotNetBar Source Code/PopupContainer.cs

@@ -0,0 +1,137 @@
+using System;
+using System.Windows.Forms;
+
+namespace DevComponents.DotNetBar
+{
+	/// <summary>
+	/// Use as a popup container for DotNetBar objects.
+	/// </summary>
+	[System.ComponentModel.ToolboxItem(false),System.ComponentModel.DesignTimeVisible(false),System.Runtime.InteropServices.ComVisible(false)]
+	public class PopupContainer:Control
+	{
+		const int WM_MOUSEACTIVATE = 0x21;
+		const int MA_NOACTIVATE = 3;
+		const int MA_NOACTIVATEANDEAT = 4;
+		const uint WS_POPUP=0x80000000;
+		const uint WS_CLIPSIBLINGS=0x04000000;
+		const uint WS_CLIPCHILDREN=0x02000000;
+		const int WS_EX_TOPMOST=0x00000008;
+		const int WS_EX_TOOLWINDOW=0x00000080;
+
+		private PopupShadow m_DropShadow=null;
+		private bool m_ShowDropShadow=false;
+
+		const int SHADOW_OFFSET=5;
+
+		public PopupContainer()
+		{
+			this.IsAccessible=false;
+			this.SetStyle(ControlStyles.Selectable,false);
+		}
+
+		protected override void Dispose(bool disposing)
+		{
+			if(m_DropShadow!=null)
+			{
+				m_DropShadow.Hide();
+				m_DropShadow.Dispose();
+				m_DropShadow=null;
+			}
+			base.Dispose(disposing);
+		}
+
+		private MenuPanel HostedMenu
+		{
+			get
+			{
+				if(this.Controls.Count>0 && this.Controls[0] is MenuPanel)
+					return this.Controls[0] as MenuPanel;
+				return null;
+			}
+		}
+
+		private Bar HostedBar
+		{
+			get
+			{
+				if(this.Controls.Count>0 && this.Controls[0] is Bar)
+					return this.Controls[0] as Bar;
+				return null;
+			}
+		}
+
+		protected override void OnVisibleChanged(EventArgs e)
+		{
+			base.OnVisibleChanged(e);
+			if(!this.Visible && m_DropShadow!=null)
+			{
+				m_DropShadow.Hide();
+				m_DropShadow.Dispose();
+				m_DropShadow=null;
+			}
+		}
+
+		protected override CreateParams CreateParams
+		{
+			get
+			{
+				CreateParams p=base.CreateParams;
+				p.Style=unchecked((int)(WS_POPUP | WS_CLIPSIBLINGS | WS_CLIPCHILDREN));
+                // Moving to Tool Window only because of Windows 8 and UIAccess=true causing menu not to show
+                // Enforcing TopMost in ShowShadow();
+                p.ExStyle = WS_EX_TOOLWINDOW; // (int)(WS_EX_TOPMOST | WS_EX_TOOLWINDOW);
+				p.Caption=""; // Setting caption would show window under tasks in Windows Task Manager
+				return p;
+			}
+		}
+		
+		protected override void WndProc(ref Message m)
+		{
+			if(m.Msg==WM_MOUSEACTIVATE)
+			{
+				m.Result=new System.IntPtr(MA_NOACTIVATE);
+				return;
+			}
+			base.WndProc(ref m);
+		}
+		
+		public void ShowShadow()
+		{
+            NativeFunctions.SetWindowPos(this.Handle, new IntPtr(NativeFunctions.HWND_TOPMOST), 0, 0, 0, 0,
+                NativeFunctions.SWP_NOACTIVATE | NativeFunctions.SWP_NOMOVE | NativeFunctions.SWP_NOSIZE);
+			if(m_ShowDropShadow)
+			{
+				if(m_DropShadow!=null)
+				{
+					m_DropShadow.Hide();
+					m_DropShadow.Dispose();
+                    m_DropShadow = null;
+				}
+
+                if (this.Width > 5 && this.Height > 5)
+                {
+                    m_DropShadow = new PopupShadow(true);
+                    m_DropShadow.CreateControl();
+                    NativeFunctions.SetWindowPos(m_DropShadow.Handle, new IntPtr(NativeFunctions.HWND_NOTOPMOST), this.Left + SHADOW_OFFSET, this.Top + SHADOW_OFFSET, this.Width - 2, this.Height - 2, NativeFunctions.SWP_SHOWWINDOW | NativeFunctions.SWP_NOACTIVATE);
+                    m_DropShadow.UpdateShadow();
+                }
+			}
+		}
+
+		public bool ShowDropShadow
+		{
+			get {return m_ShowDropShadow;}
+			set {m_ShowDropShadow=value;}
+		}
+
+		protected override void OnResize(EventArgs e)
+		{
+			if(m_DropShadow!=null)
+			{
+				NativeFunctions.SetWindowPos(m_DropShadow.Handle,new IntPtr(NativeFunctions.HWND_NOTOPMOST),this.Left+SHADOW_OFFSET,this.Top+SHADOW_OFFSET,this.Width-2,this.Height-2,NativeFunctions.SWP_SHOWWINDOW | NativeFunctions.SWP_NOACTIVATE);
+				m_DropShadow.UpdateShadow();
+			}
+			base.OnResize(e);
+		}
+	}
+}