/// <summary>
/// Realiza la navegación al Panel anterior.
/// </summary>
/// <returns>Devuelve la instancia del Panel anterior.</returns>
public UserControl PreviousPanel()
{
// Revisar si es necesaio un Invoke.
if (InvokeRequired)
{
return((UserControl)Invoke(
new Func <UserControl>(() => PreviousPanel())
));
}
if (m_currentPanelNode == null || m_currentPanelNode.Value == null)
{
throw new InvalidOperationException("There is exactly NO f*****g panels in history.");
}
if (m_currentPanelNode.Previous == null || m_currentPanelNode.Previous.Value == null)
{
throw new InvalidOperationException("There is no panel to go back to.");
}
UserControl currentPanel = m_currentPanelNode.Value;
UserControl previousPanel = m_currentPanelNode.Previous.Value;
m_currentPanelNode = m_currentPanelNode.Previous;
Trace.WriteLine("Panel switch [<] " + previousPanel.ToString());
// Mostrar u ocultar el botón Atrás según sea necesario.
if (previousPanel is Panels.IPanelNoBackButton || m_currentPanelNode.Previous == null)
{
BackButton.Hide();
}
else
{
BackButton.Show();
}
// Preparar las animaciones de los Paneles.
previousPanel.Left = -previousPanel.Width;
previousPanel.Enabled = true;
previousPanel.CreateControl();
previousPanel.Show();
previousPanel.BringToFront();
currentPanel.Enabled = false;
var animateNext = new EventHandler((Object s1, EventArgs e1) => {
MainPanel.StopAnimation("Height", "Width");
MainPanel.AnimateProperty <Animation.EaseInOutBack>("Width", previousPanel.Width);
MainPanel.AnimateProperty <Animation.EaseInOutBack>("Height", previousPanel.Height).AnimationFinished +=
(Object s2, EventArgs e2) => {
previousPanel.AnimateProperty <Animation.EaseInOutElastic>("Left", 0).AnimationFinished +=
(Object s3, EventArgs e3) => {
// Ejecutar el evento de navegación en el Panel anterior.
if (currentPanel is Panels.IPanelPreviousEvent)
{
(currentPanel as Panels.IPanelPreviousEvent).OnPreviousPanelNavigation();
}
};
};
});
var animator = currentPanel.GetCurrentAnimator("Left");
var currentPanelOffset = (currentPanel.Width > previousPanel.Width ? currentPanel.Width : previousPanel.Width) + 30;
if (animator == null)
{
animator = currentPanel.AnimateProperty <Animation.EaseInOutElastic>("Left", currentPanelOffset);
animator.AnimationFinished += animateNext;
}
else
{
animator.AnimationFinished += (Object s2, EventArgs e2) =>
currentPanel.AnimateProperty <Animation.EaseInOutElastic>("Left", currentPanelOffset).AnimationFinished +=
animateNext;
}
return(previousPanel);
}
