private void ApplyInternalSettings(WindowSettings settings)
{
// if the form implements IWindowSettingsTarget, give it a
// chance to restore internal settings
if (_form is IWindowSettingsTarget)
{
var target = (IWindowSettingsTarget)_form;
target.RestoreSettings(settings);
}
}
/// <summary>
/// Restores the saved geometry settings (if existing) for the form and
/// returns a value that indicates if the settings have been successfully
/// restored.
/// </summary>
/// <param name="restoreOption">options for the restore.</param>
/// <remarks>
/// All exceptions are ignored to make sure that this miscellaneous function
/// does never break the application. However, it is guaranteed that all
/// changes are fully rolled back.
/// </remarks>
/// <returns>True if stored settings have been encountered and successfully
/// applied, false if no stored settings existed for the form or an error
/// occurred</returns>
public bool RestoreSettings(FormStateRestoreOption restoreOption)
{
// read settings from file
WindowSettings settings;
try
{
settings = (WindowSettings)FormStatePersistence.ReadFromXml(
_fileName, _settingsType);
}
catch (Exception e)
{
_msg.Warn("Error reading stored settings", e);
// ignore the exception
return(false);
}
if (settings == null)
{
return(false);
}
else
{
// get the current settings for rollback in case of exception
WindowSettings origSettings = GetCurrentSettings();
try
{
ApplySettings(settings, restoreOption);
}
catch (Exception e)
{
// roll back and ignore the exception
try
{
ApplySettings(origSettings);
}
catch
{
_msg.Warn("Unable to roll back window settings", e);
}
finally
{
_msg.Warn("Error applying stored window settings", e);
}
return(false);
}
}
return(true);
}
private void ApplySize(WindowSettings settings)
{
if (!settings.HasSize)
{
return;
}
int maxWidth = Screen.PrimaryScreen.WorkingArea.Width;
int maxHeight = Screen.PrimaryScreen.WorkingArea.Height;
// try to restore location. Make sure that location is within current
// screen dimensions
int width = (settings.Width > maxWidth)
? maxWidth
: settings.Width;
int height = (settings.Height > maxHeight)
? maxHeight
: settings.Height;
_form.Size = new Size(width, height);
}
private void ApplySettings(WindowSettings settings,
FormStateRestoreOption restoreOption)
{
switch (restoreOption)
{
case FormStateRestoreOption.OnlyLocation:
ApplyLocation(settings);
ApplyTopMost(settings);
break;
case FormStateRestoreOption.Normal:
ApplyLocation(settings);
ApplyTopMost(settings);
ApplySize(settings);
ApplyWindowState(settings);
ApplyInternalSettings(settings);
break;
default:
throw new ArgumentException(
string.Format("Unknown restore option: {0}", restoreOption));
}
}
private void ApplyTopMost(WindowSettings settings)
{
_form.TopMost = settings.TopMost;
}
private void ApplySettings(WindowSettings settings)
{
ApplySettings(settings, FormStateRestoreOption.Normal);
}
