/// <summary>
/// Looks up a window in the user settings and returns its saved position.
/// </summary>
/// <param name = "name">The name.</param>
/// <returns>
/// The saved window position if it exists. Null if the entry
/// doesn't exist, or would not be visible on any screen in the user's
/// current display setup.
/// </returns>
private static WindowPosition LookupWindowPosition(string name)
{
try
{
if (_windowPositionList == null)
{
_windowPositionList = WindowPositionList.Load();
}
var position = _windowPositionList?.Get(name);
if (position == null || position.Rect.IsEmpty)
{
return(null);
}
if (Screen.AllScreens.Any(screen => screen.WorkingArea.IntersectsWith(position.Rect)))
{
return(position);
}
}
catch (Exception)
{
// TODO: howto restore a corrupted config?
}
return(null);
}
/// <summary>
/// Save the position of a form to the user settings. Hides the window
/// as a side-effect.
/// </summary>
/// <param name = "name">The name to use when writing the position to the
/// settings</param>
private void SavePosition(string name)
{
if (!_needsPositionSave)
{
return;
}
_needsPositionSave = false;
try
{
var rectangle = WindowState == FormWindowState.Normal
? DesktopBounds
: RestoreBounds;
var formWindowState = WindowState == FormWindowState.Maximized
? FormWindowState.Maximized
: FormWindowState.Normal;
if (_windowPositionList == null)
{
_windowPositionList = WindowPositionList.Load();
if (_windowPositionList == null)
{
return;
}
}
WindowPosition windowPosition = _windowPositionList.Get(name);
// Don't save location when we center modal form
if (windowPosition != null && Owner != null && _windowCentred)
{
if (rectangle.Width <= windowPosition.Rect.Width && rectangle.Height <= windowPosition.Rect.Height)
{
rectangle.Location = windowPosition.Rect.Location;
}
}
var position = new WindowPosition(rectangle, DpiUtil.DpiX, formWindowState, name);
_windowPositionList.AddOrUpdate(position);
_windowPositionList.Save();
}
catch
{
// TODO: how to restore a corrupted config?
}
}
/// <summary>
/// Save the position of a form to the user settings. Hides the window
/// as a side-effect.
/// </summary>
/// <param name="form">The form to save the position for.</param>
public void SavePosition(Form form)
{
try
{
var rectangle = form.WindowState == FormWindowState.Normal
? form.DesktopBounds
: form.RestoreBounds;
var formWindowState = form.WindowState == FormWindowState.Maximized
? FormWindowState.Maximized
: FormWindowState.Normal;
if (_windowPositionList is null)
{
_windowPositionList = WindowPositionList.Load();
if (_windowPositionList is null)
{
return;
}
}
var name = form.GetType().Name;
WindowPosition windowPosition = _windowPositionList.Get(name);
var windowCentred = form.StartPosition == FormStartPosition.CenterParent;
// Don't save location when we center modal form
if (windowPosition is not null && form.Owner is not null && windowCentred)
{
if (rectangle.Width <= windowPosition.Rect.Width && rectangle.Height <= windowPosition.Rect.Height)
{
rectangle.Location = windowPosition.Rect.Location;
}
}
var position = new WindowPosition(rectangle, DpiUtil.DpiX, formWindowState, name);
_windowPositionList.AddOrUpdate(position);
_windowPositionList.Save();
}
catch
{
// TODO: how to restore a corrupted config?
}
}
/// <summary>
/// Retrieves a persisted position for the given <paramref name="form"/>.
/// </summary>
/// <param name="form">The form to look the position for.</param>
/// <returns>The form's persisted position; otherwise <see langword="null"/>.</returns>
public WindowPosition?LoadPosition(Form form)
{
try
{
_windowPositionList ??= WindowPositionList.Load();
var pos = _windowPositionList?.Get(form.GetType().Name);
if (pos is not null && !pos.Rect.IsEmpty)
{
return(pos);
}
}
catch
{
// TODO: how to restore a corrupted config?
}
return(null);
}
/// <summary>
/// Save the position of a form to the user settings. Hides the window
/// as a side-effect.
/// </summary>
/// <param name = "name">The name to use when writing the position to the
/// settings</param>
private void SavePosition(String name)
{
try
{
var rectangle =
WindowState == FormWindowState.Normal
? DesktopBounds
: RestoreBounds;
var formWindowState =
WindowState == FormWindowState.Maximized
? FormWindowState.Maximized
: FormWindowState.Normal;
// Write to the user settings:
if (_windowPositionList == null)
{
_windowPositionList = WindowPositionList.Load();
}
WindowPosition windowPosition = _windowPositionList.Get(name);
// Don't save location when we center modal form
if (windowPosition != null && Owner != null && _windowCentred)
{
if (rectangle.Width <= windowPosition.Rect.Width && rectangle.Height <= windowPosition.Rect.Height)
{
rectangle.Location = windowPosition.Rect.Location;
}
}
int deviceDpi = GetCurrentDeviceDpi();
var position = new WindowPosition(rectangle, deviceDpi, formWindowState, name);
_windowPositionList.AddOrUpdate(position);
_windowPositionList.Save();
}
catch (Exception)
{
// TODO: howto restore a corrupted config?
}
}
/// <summary>
/// Restores the position of a form from the user settings. Does
/// nothing if there is no entry for the form in the settings, or the
/// setting would be invisible on the current display configuration.
/// </summary>
protected virtual void RestorePosition()
{
if (!_needsPositionRestore)
{
return;
}
if (WindowState == FormWindowState.Minimized)
{
return;
}
_windowCentred = StartPosition == FormStartPosition.CenterParent;
var position = LookupWindowPosition(GetType().Name);
if (position == null)
{
return;
}
_needsPositionRestore = false;
if (!Screen.AllScreens.Any(screen => screen.WorkingArea.IntersectsWith(position.Rect)))
{
if (position.State == FormWindowState.Maximized)
{
WindowState = FormWindowState.Maximized;
}
return;
}
SuspendLayout();
StartPosition = FormStartPosition.Manual;
if (FormBorderStyle == FormBorderStyle.Sizable ||
FormBorderStyle == FormBorderStyle.SizableToolWindow)
{
Size = DpiUtil.Scale(position.Rect.Size, originalDpi: position.DeviceDpi);
}
if (Owner == null || !_windowCentred)
{
var location = DpiUtil.Scale(position.Rect.Location, originalDpi: position.DeviceDpi);
if (FindWindowScreen(location) is Rectangle rect)
{
location.Y = rect.Y;
}
DesktopLocation = location;
}
else
{
// Calculate location for modal form with parent
Location = new Point(
Owner.Left + (Owner.Width / 2) - (Width / 2),
Math.Max(0, Owner.Top + (Owner.Height / 2) - (Height / 2)));
}
if (WindowState != position.State)
{
WindowState = position.State;
}
ResumeLayout();
return;
Rectangle?FindWindowScreen(Point location)
{
var distance = new SortedDictionary <float, Rectangle>();
foreach (var rect in Screen.AllScreens.Select(screen => screen.WorkingArea))
{
if (rect.Contains(location) && !distance.ContainsKey(0.0f))
{
return(null); // title in screen
}
int midPointX = rect.X + (rect.Width / 2);
int midPointY = rect.Y + (rect.Height / 2);
var d = (float)Math.Sqrt(((location.X - midPointX) * (location.X - midPointX)) +
((location.Y - midPointY) * (location.Y - midPointY)));
distance.Add(d, rect);
}
return(distance.FirstOrDefault().Value);
}
WindowPosition LookupWindowPosition(string name)
{
try
{
if (_windowPositionList == null)
{
_windowPositionList = WindowPositionList.Load();
}
var pos = _windowPositionList?.Get(name);
if (pos != null && !pos.Rect.IsEmpty)
{
return(pos);
}
}
catch
{
// TODO: how to restore a corrupted config?
}
return(null);
}
}