/// <summary>
/// Gets the dpi of the display. If the window is not on any monitor the primary monitor's
/// dpi is returned instead.
/// <para/>
/// On Windows version lower than 8, the dpi is the same for all monitors.
/// </summary>
/// <param name="windowHandle">The handle of the window displayed by the monitor</param>
/// <returns>The dpi of the current display</returns>
public static MonitorDpi GetDpi(IntPtr windowHandle)
{
if ((Environment.OSVersion.Version.Major >= 6 && Environment.OSVersion.Version.Minor >= 2) || Environment.OSVersion.Version.Major >= 10)
{
var monitor = UnsafeNative.MonitorFromWindow(windowHandle, MonitorOptions.MONITOR_DEFAULTTONULL);
if (monitor == IntPtr.Zero)
{
monitor = UnsafeNative.MonitorFromPoint(new UnsafeNative.POINT {
x = 0, y = 0
}, MonitorOptions.MONITOR_DEFAULTTOPRIMARY);
}
UnsafeNative.GetDpiForMonitor(monitor, UnsafeNative.DpiType.Effective, out uint dpiX, out uint dpiY);
return(new MonitorDpi {
x = dpiX, y = dpiY
});
}
else
{
var desktop = Graphics.FromHwnd(IntPtr.Zero).GetHdc();
var logicalPixelsx = (uint)UnsafeNative.GetDeviceCaps(desktop, UnsafeNative.DeviceCap.LOGPIXELSX);
var logicalPixelsy = (uint)UnsafeNative.GetDeviceCaps(desktop, UnsafeNative.DeviceCap.LOGPIXELSY);
return(new MonitorDpi {
x = logicalPixelsx, y = logicalPixelsy
});
}
}
/// <summary>
/// Gets the bounds of the monitor that contains the defined window
/// </summary>
/// <param name="windowHandle">The handle of the window displayed by the monitor</param>
/// <returns>
/// Returns the bounds of the monitor. Returns null if window is not on any monitor.
/// </returns>
public static Rect?GetMonitorBounds(IntPtr windowHandle)
{
var monitor = UnsafeNative.MonitorFromWindow(windowHandle, MonitorOptions.MONITOR_DEFAULTTONULL);
if (monitor != IntPtr.Zero)
{
UnsafeNative.MONITORINFO monitorInfo = new UnsafeNative.MONITORINFO();
UnsafeNative.GetMonitorInfo(monitor, monitorInfo);
UnsafeNative.RECT rcWorkArea = monitorInfo.rcWork;
UnsafeNative.RECT rcMonitorArea = monitorInfo.rcMonitor;
return(new Rect(rcMonitorArea.left, rcMonitorArea.top, Math.Abs(rcMonitorArea.left - rcMonitorArea.right), Math.Abs(rcMonitorArea.bottom - rcMonitorArea.top)));
}
return(null);
}
/// <summary>
/// Sent to a window when the size or position of the window is about to change. An
/// application can use this message to override the window's default maximized size and
/// position, or its default minimum or maximum tracking size.
/// </summary>
/// <param name="windowHandle">The handle of the window displayed by the monitor</param>
/// <param name="lParam">Additional message-specific information</param>
public static void WmGetMinMaxInfo(IntPtr windowHandle, IntPtr lParam)
{
var mmi = (UnsafeNative.MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(UnsafeNative.MINMAXINFO));
// Adjust the maximized size and position to fit the work area of the correct monitor
var monitor = UnsafeNative.MonitorFromWindow(windowHandle, MonitorOptions.MONITOR_DEFAULTTONEAREST);
if (monitor != System.IntPtr.Zero)
{
UnsafeNative.MONITORINFO monitorInfo = new UnsafeNative.MONITORINFO();
UnsafeNative.GetMonitorInfo(monitor, monitorInfo);
UnsafeNative.RECT rcWorkArea = monitorInfo.rcWork;
UnsafeNative.RECT rcMonitorArea = monitorInfo.rcMonitor;
mmi.ptMaxPosition.x = Math.Abs(rcWorkArea.left - rcMonitorArea.left);
mmi.ptMaxPosition.y = Math.Abs(rcWorkArea.top - rcMonitorArea.top);
mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left);
mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top);
}
Marshal.StructureToPtr(mmi, lParam, true);
}
/// <summary> /// Determines if the window is shown in any of the monitors. /// </summary> /// <param name="windowHandle">The handle of the window displayed by the monitor</param> /// <returns>true if the window is displayed on any monitor; otherwise false</returns> public static bool WindowIsInAnyMonitor(IntPtr windowHandle) => // If MonitorFromWindow has returned zero, we are sure that the window is not in any of // our monitors UnsafeNative.MonitorFromWindow(windowHandle, MonitorOptions.MONITOR_DEFAULTTONULL) != IntPtr.Zero;
