private void RestoreMdiContainerState(MdiContainerWithState mdiContainerWithState)
{
MdiContainerForm mdiContainerForm = mdiContainerWithState.Form;
PersistableFormState formState = mdiContainerWithState.State.FormState;
bool boundsInitialized = false;
Rectangle targetBounds = formState.Bounds;
// If all bounds are known initialize from those.
// Do make sure the window ends up on a visible working area.
targetBounds.Intersect(Screen.GetWorkingArea(targetBounds));
if (targetBounds.Width >= mdiContainerForm.MinimumSize.Width && targetBounds.Height >= mdiContainerForm.MinimumSize.Height)
{
mdiContainerForm.SetBounds(targetBounds.Left, targetBounds.Top, targetBounds.Width, targetBounds.Height, BoundsSpecified.All);
boundsInitialized = true;
}
// Determine a window state independently if no formState was applied successfully.
if (!boundsInitialized)
{
SetDefaultSizeAndPosition(mdiContainerForm);
}
// Restore maximized setting after setting the Bounds.
if (formState.Maximized)
{
mdiContainerForm.WindowState = FormWindowState.Maximized;
}
}
private void RegisterMdiContainerFormEvents(MdiContainerForm mdiContainerForm)
{
mdiContainerForm.FormClosed += (sender, _) =>
{
if (FindMdiContainer((MdiContainerForm)sender, out int index))
{
mdiContainers.RemoveAt(index);
if (mdiContainers.Count > 0)
{
AutoSaveMdiContainerList();
}
else
{
// Close the entire process after the last form is closed.
// When the application is reopened, the state of this last form is restored.
Close();
}
}
};
mdiContainerForm.Activated += (sender, _) =>
{
// Bring to front of list if activated.
if (FindMdiContainer((MdiContainerForm)sender, out int index))
{
var activatedFormWithState = mdiContainers[index];
mdiContainers.RemoveAt(index);
mdiContainers.Insert(0, activatedFormWithState);
AutoSaveMdiContainerList();
}
};
}
private static void SetDefaultSizeAndPosition(MdiContainerForm mdiContainerForm)
{
// Show in the center of the monitor where the mouse currently is.
var activeScreen = Screen.FromPoint(MousePosition);
Rectangle workingArea = activeScreen.WorkingArea;
// Two thirds the size of the active monitor's working area.
workingArea.Inflate(-workingArea.Width / 6, -workingArea.Height / 6);
// Update the bounds of the form.
mdiContainerForm.SetBounds(workingArea.X, workingArea.Y, workingArea.Width, workingArea.Height, BoundsSpecified.All);
}
private bool FindMdiContainer(MdiContainerForm form, out int index)
{
// Linear search.
for (index = 0; index < mdiContainers.Count; index++)
{
if (mdiContainers[index].Form == form)
{
return(true);
}
}
return(false);
}
internal MdiContainerForm CreateNewMdiContainerForm()
{
var mdiContainerForm = new MdiContainerForm();
RegisterMdiContainerFormEvents(mdiContainerForm);
var formWithDefaultState = new MdiContainerWithState(mdiContainerForm, new MdiContainerState(new PersistableFormState(false, Rectangle.Empty)));
mdiContainers.Add(formWithDefaultState);
mdiContainerForm.Load += (_, __) =>
{
SetDefaultSizeAndPosition(mdiContainerForm);
AttachFormStateAutoSaver(formWithDefaultState);
};
return(mdiContainerForm);
}
public MdiContainerWithState(MdiContainerForm form, MdiContainerState state)
{
Form = form;
State = state;
}