From 73f5f1d2147c83b9b429e30eb1b8d181d77611ac Mon Sep 17 00:00:00 2001
From: Thomas Bernard <miniupnp@free.fr>
Date: Tue, 5 Feb 2019 09:55:13 +0100
Subject: [PATCH] x11: capture pointer when a button is pressed

---
 src/input.c     | 5 +++++
 src/x11screen.c | 4 +++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/input.c b/src/input.c
index e9c5b708..8709ed3d 100644
--- a/src/input.c
+++ b/src/input.c
@@ -1739,6 +1739,10 @@ int Get_input(int sleep_time)
           }
           break;
         case ButtonPress: // left = 1, middle = 2, right = 3, wheelup = 4, wheeldown = 5
+          XGrabPointer(X11_display, X11_window, True,
+                       PointerMotionMask | ButtonPressMask | ButtonReleaseMask,
+                       GrabModeAsync, GrabModeAsync,
+                       X11_window, None, CurrentTime);
           //printf("Press button = %d state = 0x%08x\n", event.xbutton.button, event.xbutton.state);
           if (event.xkey.state & ShiftMask)
             mod |= MOD_SHIFT;
@@ -1777,6 +1781,7 @@ int Get_input(int sleep_time)
           }
           break;
         case ButtonRelease:
+          XUngrabPointer(X11_display, CurrentTime);
           //printf("Release button = %d\n", event.xbutton.button);
           if(event.xbutton.button == 1 || event.xbutton.button == 3)
           {
diff --git a/src/x11screen.c b/src/x11screen.c
index 3bab4b3a..dba8d67e 100644
--- a/src/x11screen.c
+++ b/src/x11screen.c
@@ -333,5 +333,7 @@ void Define_icon(void)
 
 void Set_mouse_position(void)
 {
-  /// @todo implement screen capture and set position for x11.
+  XWarpPointer(X11_display, None, X11_window,
+               0, 0, 0, 0,
+               Mouse_X * Pixel_width, Mouse_Y * Pixel_height);
 }