From cdc67e80ac78d08aee04bbc55ece650579beba6c Mon Sep 17 00:00:00 2001
From: Jonas Kümmerlin <jonas@kuemmerlin.eu>
Date: Fri, 19 Jun 2020 16:48:18 +0200
Subject: add functions for centering a toplevel window on the monitor

---
 alf/alfcompat.cpp | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

(limited to 'alf/alfcompat.cpp')

diff --git a/alf/alfcompat.cpp b/alf/alfcompat.cpp
index 7b30eac..45f5f4a 100644
--- a/alf/alfcompat.cpp
+++ b/alf/alfcompat.cpp
@@ -492,6 +492,37 @@ ALF_Compat_fallbackLoadIconWithScaleDown(HINSTANCE hinst,
     return E_NOTIMPL;
 }
 
+static BOOL WINAPI
+ALF_Compat_fallbackGetMonitorInfoA(HMONITOR monitor, MONITORINFO *lpmi)
+{
+    if (monitor != (HMONITOR)0x12340042 || !lpmi || lpmi->cbSize != sizeof(MONITORINFO))
+        return FALSE;
+
+    lpmi->rcMonitor.left = 0;
+    lpmi->rcMonitor.top  = 0;
+    lpmi->rcMonitor.right  = GetSystemMetrics(SM_CXSCREEN);
+    lpmi->rcMonitor.bottom = GetSystemMetrics(SM_CYSCREEN);
+    SystemParametersInfoA(SPI_GETWORKAREA, 0, &lpmi->rcWork, 0);
+    lpmi->dwFlags = MONITORINFOF_PRIMARY;
+    return TRUE;
+}
+
+static HMONITOR WINAPI ALF_Compat_fallbackMonitorFromPoint(POINT pt, DWORD flags)
+{
+    (void)pt;
+    (void)flags;
+
+    return (HMONITOR)0x12340042; // like multimon.h
+}
+
+static HMONITOR WINAPI ALF_Compat_fallbackMonitorFromWindow(HWND window, DWORD flags)
+{
+    (void)window;
+    (void)flags;
+
+    return (HMONITOR)0x12340042; // like multimon.h
+}
+
 
 static BOOL CALLBACK
 ALF_Compat_DrawDisabledText_DrawStateProc(HDC hdc,
@@ -603,6 +634,9 @@ void ALF_LoadCompatFunctions(void)
     LOAD_FUNC(user32, AdjustWindowRectExForDpi);
     LOAD_FUNC(user32, GetSystemMetricsForDpi);
     LOAD_FUNC(user32, SystemParametersInfoForDpi);
+    LOAD_FUNC(user32, GetMonitorInfoA);
+    LOAD_FUNC(user32, MonitorFromPoint);
+    LOAD_FUNC(user32, MonitorFromWindow);
 
     *((FARPROC*)&ALF_Compat_TrackMouseEvent) = GetProcAddress(_alf_dll_comctl32, "_TrackMouseEvent");
     if (!ALF_Compat_TrackMouseEvent)
@@ -761,3 +795,6 @@ HRESULT (WINAPI *ALF_Compat_GetThemeTransitionDuration)(HTHEME,int,int,int,int,D
 HRESULT (WINAPI *ALF_Compat_GetThemeColor)(HTHEME,int,int,int,COLORREF*) = NULL;
 HRESULT (WINAPI *ALF_Compat_GetThemeMargins)(HTHEME,HDC,int,int,int,const RECT *,MARGINS *) = NULL;
 HRESULT (WINAPI *ALF_Compat_LoadIconWithScaleDown)(HINSTANCE,PCWSTR,int,int,HICON *) = NULL;
+BOOL (WINAPI *ALF_Compat_GetMonitorInfoA)(HMONITOR,MONITORINFO *) = NULL;
+HMONITOR (WINAPI *ALF_Compat_MonitorFromPoint)(POINT,DWORD) = NULL;
+HMONITOR (WINAPI *ALF_Compat_MonitorFromWindow)(HWND,DWORD) = NULL;
-- 
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