/// <summary>
/// Polls and updates the statuses of connected monitors.
/// </summary>
private void PollMonitors()
{
// All monitors are considered inactive until proven otherwise.
var inactive = new List <Monitor>();
inactive.AddRange(Monitors);
for (uint adapterIndex = 0;; adapterIndex++)
{
var first = false;
var adapter = new DisplayDeviceW();
adapter.Cb = (uint)Marshal.SizeOf(adapter);
if (!User32.EnumDisplayDevicesW(null, adapterIndex, ref adapter, 0))
{
break;
}
// If the adapter is inactive - continue;
if ((adapter.StateFlags & DisplayDeviceStateFlags.Active) == 0)
{
continue;
}
if ((adapter.StateFlags & DisplayDeviceStateFlags.PrimaryDevice) != 0)
{
first = true;
}
uint displayIndex;
for (displayIndex = 0;; displayIndex++)
{
var display = new DisplayDeviceW();
display.Cb = (uint)Marshal.SizeOf(display);
if (!User32.EnumDisplayDevicesW(adapter.DeviceName, displayIndex, ref display, 0))
{
break;
}
// If not active - continue;
if ((display.StateFlags & DisplayDeviceStateFlags.Active) == 0)
{
continue;
}
// If active - remove from inactive list.
// If something was removed, that means this display exists in the monitor array.
if (inactive.RemoveAll(x => x.Name == display.DeviceName) > 0)
{
continue;
}
UpdateMonitor(new Win32Monitor(adapter, display), true, first);
}
// HACK: If an active adapter does not have any display devices (as sometimes happens), add it directly as a monitor.
if (displayIndex != 0)
{
continue;
}
// Remove self from inactive list.
if (inactive.RemoveAll(x => x.Name == adapter.DeviceName) > 0)
{
continue;
}
UpdateMonitor(new Win32Monitor(adapter, null), true, first);
}
foreach (Monitor inactiveMonitor in inactive)
{
UpdateMonitor(inactiveMonitor, false, false);
}
}
