Implemented monitor (dis)connect callback for win32.

src/win32_monitor.c

@@ -83,6 +83,9 @@ _GLFWmonitor* _glfwDestroyMonitor(_GLFWmonitor* monitor)
     return result;
 }
 
+// todo: This is ugly. The platform should only allocate a list of the current devices.
+// The platform independent code should be in charge of the handling for the initial
+// setup, refreshing and freeing the list.
 void _glfwInitMonitors(void)
 {
     _GLFWmonitor** curMonitor;
@@ -106,7 +109,7 @@ void _glfwInitMonitors(void)
 
     while (EnumDisplayDevices(NULL, adapterNum++, &adapter, 0))
     {
-        if (adapter.StateFlags & DISPLAY_DEVICE_MIRRORING_DRIVER)
+        if (adapter.StateFlags & DISPLAY_DEVICE_MIRRORING_DRIVER || !(adapter.StateFlags & DISPLAY_DEVICE_ACTIVE))
             continue;
 
         EnumDisplaySettingsEx(adapter.DeviceName,
@@ -120,6 +123,106 @@ void _glfwInitMonitors(void)
     }
 }
 
+void _glfwRefreshMonitors(void)
+{
+    DISPLAY_DEVICE adapter;
+    DWORD adapterNum = 0;
+
+    DISPLAY_DEVICE monitor;
+
+    DEVMODE setting;
+
+    _GLFWmonitor* newMonitorList = NULL;
+    _GLFWmonitor** curMonitor = &newMonitorList;
+
+    _GLFWmonitor* curNewMonitor;
+    _GLFWmonitor* curOldMonitor;
+
+    while (EnumDisplayDevices(NULL, adapterNum++, &adapter, 0))
+    {
+        if (adapter.StateFlags & DISPLAY_DEVICE_MIRRORING_DRIVER || !(adapter.StateFlags & DISPLAY_DEVICE_ACTIVE))
+            continue;
+
+        EnumDisplaySettingsEx(adapter.DeviceName, ENUM_CURRENT_SETTINGS, &setting, EDS_ROTATEDMODE);
+
+        EnumDisplayDevices(adapter.DeviceName, 0, &monitor, 0);
+
+        curMonitor = _glfwCreateMonitor(curMonitor, &adapter, &monitor, &setting);
+    }
+
+    curNewMonitor = newMonitorList;
+    curOldMonitor = _glfwLibrary.monitorListHead;
+
+    while (_glfwLibrary.monitorCallback && (curNewMonitor || curOldMonitor))
+    {
+        _GLFWmonitor* lookAheadOldMonitor;
+        _GLFWmonitor* lookAheadNewMonitor;
+
+        if (curOldMonitor && curNewMonitor && !strcmp(curOldMonitor->name, curOldMonitor->name))
+        {
+            curNewMonitor = curNewMonitor->next;
+            curOldMonitor = curOldMonitor->next;
+            continue;
+        }
+
+        if (curNewMonitor && !curOldMonitor)
+        {
+            _glfwLibrary.monitorCallback(curNewMonitor, GLFW_MONITOR_CONNECTED);
+            curNewMonitor = curNewMonitor->next;
+            continue;
+        }
+
+        if (!curNewMonitor && curOldMonitor)
+        {
+            _glfwLibrary.monitorCallback(curOldMonitor, GLFW_MONITOR_DISCONNECTED);
+            curOldMonitor = curOldMonitor->next;
+            continue;
+        }
+
+        lookAheadOldMonitor = curOldMonitor->next;
+        lookAheadNewMonitor = curNewMonitor->next;
+
+        while (lookAheadOldMonitor && !strcmp(curNewMonitor->name, lookAheadOldMonitor->name))
+            lookAheadOldMonitor = lookAheadOldMonitor->next;
+
+        while (lookAheadNewMonitor && !strcmp(curOldMonitor->name, lookAheadNewMonitor->name))
+            lookAheadNewMonitor = lookAheadNewMonitor->next;
+
+        if (!lookAheadOldMonitor)
+        {
+            // nothing found in the old monitor list, that matches the current new monitor.
+            _glfwLibrary.monitorCallback(curNewMonitor, GLFW_MONITOR_CONNECTED);
+            curNewMonitor = curNewMonitor->next;
+        }
+        else
+        {
+            while (strcmp(curOldMonitor->name, lookAheadOldMonitor->name))
+            {
+                _glfwLibrary.monitorCallback(curOldMonitor, GLFW_MONITOR_DISCONNECTED);
+                curOldMonitor = curOldMonitor->next;
+            }
+        }
+
+        if (!lookAheadNewMonitor)
+        {
+            // nothing found in the new monitor list, that matches the current old monitor.
+            _glfwLibrary.monitorCallback(curOldMonitor, GLFW_MONITOR_DISCONNECTED);
+            curOldMonitor = curOldMonitor->next;
+        }
+        else
+        {
+            while (strcmp(curNewMonitor->name, lookAheadNewMonitor->name))
+            {
+                _glfwLibrary.monitorCallback(curNewMonitor, GLFW_MONITOR_CONNECTED);
+                curNewMonitor = curNewMonitor->next;
+            }
+        }
+    }
+
+    _glfwTerminateMonitors();
+    _glfwLibrary.monitorListHead = newMonitorList;
+}
+
 void _glfwTerminateMonitors(void)
 {
     while (_glfwLibrary.monitorListHead)

src/win32_platform.h

@@ -42,6 +42,7 @@
 
 #include <windows.h>
 #include <mmsystem.h>
+#include <Dbt.h>
 
 // This path may need to be changed if you build GLFW using your own setup
 // We ship and use our own copy of wglext.h since GLFW uses fairly new
@@ -332,6 +333,7 @@ void _glfwInitTimer(void);
 
 // Monitor support
 void _glfwInitMonitors(void);
+void _glfwRefreshMonitors(void);
 void _glfwTerminateMonitors(void);
 
 // Fullscreen support

src/win32_window.c

@@ -30,7 +30,6 @@
 
 #include "internal.h"
 
-#include <stdio.h>
 #include <stdlib.h>
 
 
@@ -1104,6 +1103,16 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
 
             break;
         }
+
+        case WM_DEVICECHANGE:
+        {
+            if (DBT_DEVNODES_CHANGED == wParam)
+            {
+                _glfwRefreshMonitors();
+                return TRUE;
+            }
+            break;
+        }
     }
 
     // Pass all unhandled messages to DefWindowProc