From ea1adebe31673917c957f455d3588b6486142128 Mon Sep 17 00:00:00 2001
From: Darkvater <darkvater@openttd.org>
Date: Fri, 24 Mar 2006 00:42:35 +0000
Subject: (svn r4075) - Feature: Undraw the mouse when it leaves the window and
 Draw it again when it enters. Added both for WIN32 and SDL. Since Win95 has
 troubles with TrackMouseEvent(), this function was just simply rewritten
 which was the easiest. Based on a patch by DmitryKo.

---
 video/sdl_v.c   |  9 +++++++++
 video/win32_v.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 62 insertions(+)

(limited to 'video')

diff --git a/video/sdl_v.c b/video/sdl_v.c
index 3b27c7ad6..d190237fb 100644
--- a/video/sdl_v.c
+++ b/video/sdl_v.c
@@ -345,6 +345,15 @@ static int PollEvent(void)
 		}
 		break;
 
+	case SDL_ACTIVEEVENT:
+		if (ev.active.gain == 1) // mouse entered the window, enable cursor
+			_cursor.in_window = true;
+		else if (ev.active.gain == 0) {
+			UndrawMouseCursor(); // mouse left the window, undraw cursor
+			_cursor.in_window = false;
+		}
+		break;
+
 	case SDL_QUIT:
 		// do not ask to quit on the main screen
 		if (_game_mode != GM_MENU) {
diff --git a/video/win32_v.c b/video/win32_v.c
index 3ecda2528..aff4f2526 100644
--- a/video/win32_v.c
+++ b/video/win32_v.c
@@ -184,9 +184,40 @@ int RedrawScreenDebug(void)
 }
 #endif
 
+/* Windows 95 will not have a WM_MOUSELEAVE message, so define it if
+ * needed. There is no such event as WM_MOUSEENTER, we just made this up :) */
+#define WM_MOUSEENTER WM_USER + 1
+#if !defined(WM_MOUSELEAVE)
+#define WM_MOUSELEAVE 0x02A3
+#endif
+#define TID_POLLMOUSE 1
+#define MOUSE_POLL_DELAY 75
+
+static void CALLBACK TrackMouseTimerProc(HWND hwnd, UINT msg, UINT event, DWORD time)
+{
+	RECT rc;
+	POINT pt;
+
+	/* Get the rectangle of our window and translate it to screen coordinates.
+	 * Compare this with the current screen coordinates of the mouse and if it
+	 * falls outside of the area or our window we have left the window. */
+	GetClientRect(hwnd, &rc);
+	MapWindowPoints(hwnd, HWND_DESKTOP, (LPPOINT)&rc, 2);
+	GetCursorPos(&pt);
+
+	if (!PtInRect(&rc, pt) || (WindowFromPoint(pt) != hwnd)) {
+		KillTimer(hwnd, event);
+		PostMessage(hwnd, WM_MOUSELEAVE, 0, 0L);
+	}
+}
+
 static LRESULT CALLBACK WndProcGdi(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
 	switch (msg) {
+	case WM_CREATE:
+		SetTimer(hwnd, TID_POLLMOUSE, MOUSE_POLL_DELAY, (TIMERPROC)TrackMouseTimerProc);
+		break;
+
 	case WM_PAINT: {
 		PAINTSTRUCT ps;
 		HDC dc,dc2;
@@ -259,11 +290,33 @@ static LRESULT CALLBACK WndProcGdi(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lP
 		_right_button_down = false;
 		return 0;
 
+	case WM_MOUSEENTER:
+		printf("enter\n");
+		_cursor.in_window = true;
+		DrawMouseCursor();
+		break;
+
+	case WM_MOUSELEAVE:
+		printf("enter\n");
+		UndrawMouseCursor();
+		_cursor.in_window = false;
+		break;
+
 	case WM_MOUSEMOVE: {
 		int x = (int16)LOWORD(lParam);
 		int y = (int16)HIWORD(lParam);
 		POINT pt;
 
+		/* If the mouse was not in the window and it has moved it means it has
+		 * come into the window, so send a WM_MOUSEENTER message. Also start
+		 * tracking the mouse for exiting the window */
+		if (!_cursor.in_window) {
+			_cursor.in_window = true;
+			SetTimer(hwnd, TID_POLLMOUSE, MOUSE_POLL_DELAY, (TIMERPROC)TrackMouseTimerProc);
+
+			if (hwnd != GetCapture()) PostMessage(hwnd, WM_MOUSEENTER, 0, 0L);
+		}
+
 		if (_wnd.double_size) {
 			x /= 2;
 			y /= 2;
-- 
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