From 5f2a2074742123ffa882d09bec1826ab64ba764c Mon Sep 17 00:00:00 2001
From: Jaehyuk-Lee <alex00728@outlook.com>
Date: Sun, 6 Jun 2021 05:58:56 +0900
Subject: [PATCH] enable click-through

---
 Overlay/DutyOvForm.cs |  6 ------
 Tab/DutyForm.cs       | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 39 insertions(+), 6 deletions(-)

diff --git a/Overlay/DutyOvForm.cs b/Overlay/DutyOvForm.cs
index 6b5fcb2..7b80e1e 100644
--- a/Overlay/DutyOvForm.cs
+++ b/Overlay/DutyOvForm.cs
@@ -61,9 +61,6 @@ namespace DutyContent.Overlay
 
 		private void DoMoveDown(MouseEventArgs e)
 		{
-			if (DcConfig.Duty.OverlayClickThru)
-				return;
-
 			if (e.Button == MouseButtons.Left)
 			{
 				ThirdParty.NativeMethods.ReleaseCapture();
@@ -73,9 +70,6 @@ namespace DutyContent.Overlay
 
 		protected override void OnMouseDown(MouseEventArgs e)
 		{
-			if (DcConfig.Duty.OverlayClickThru)
-				return;
-
 			base.OnMouseDown(e);
 			DoMoveDown(e);
 		}
diff --git a/Tab/DutyForm.cs b/Tab/DutyForm.cs
index d0d9f51..8ab7a45 100644
--- a/Tab/DutyForm.cs
+++ b/Tab/DutyForm.cs
@@ -9,6 +9,7 @@ using System.Net;
 using System.Net.Http;
 using System.Text;
 using System.IO;
+using System.Runtime.InteropServices;
 
 namespace DutyContent.Tab
 {
@@ -34,6 +35,12 @@ namespace DutyContent.Tab
 			_overlay = new Overlay.DutyOvForm();
 		}
 
+		// Used for click-through function
+		[DllImport("user32.dll", SetLastError = true)]
+		static extern int GetWindowLong(IntPtr hWnd, int nIndex);
+		[DllImport("user32.dll")]
+		static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);
+
 		private void DutyTabForm_FormClosing(object sender, FormClosingEventArgs e)
 		{
 
@@ -75,6 +82,8 @@ namespace DutyContent.Tab
 				_overlay.Show();
 			else
 				_overlay.Hide();
+			if (DcConfig.Duty.OverlayClickThru)
+				enableOverlayClickThru();
 
 			//
 			chkEnableSound.Checked = DcConfig.Duty.EnableSound;
@@ -669,6 +678,10 @@ namespace DutyContent.Tab
 				return;
 
 			DcConfig.Duty.OverlayClickThru = chkOverlayClickThru.Checked;
+			if (DcConfig.Duty.OverlayClickThru)
+				enableOverlayClickThru();
+			else
+				disableOverlayClickThru();
 
 			SaveConfig();
 		}
@@ -1314,5 +1327,31 @@ namespace DutyContent.Tab
 				}
 			}
 		}
+
+		void enableOverlayClickThru()
+		{
+			int initialStyle = GetWindowLong(_overlay.Handle, -20);
+			if (DcConfig.Duty.OverlayClickThru)
+			{
+				SetWindowLong(_overlay.Handle, -20, initialStyle | 0x80000 | 0x20);
+			}
+			else
+			{
+				SetWindowLong(_overlay.Handle, -20, (0x00000 | 0x80000));
+			}
+		}
+
+		void disableOverlayClickThru()
+		{
+			int initialStyle = GetWindowLong(_overlay.Handle, -20);
+			if (DcConfig.Duty.OverlayClickThru)
+			{
+				SetWindowLong(_overlay.Handle, -20, initialStyle | 0x80000 | 0x20);
+			}
+			else
+			{
+				SetWindowLong(_overlay.Handle, -20, (0x00000 | 0x80000));
+			}
+		}
 	}
 }