public void NextTransition()
{
// Remember that the application has requested that we start:
// - This is used to distinguish when we start the app with no transitions enabled vs.
// we start with some enabled and the User subsequently disables all of them.
// - This enables the caller to call UpdateTransitionEnabled() to configure the
// TransitionController before calling NextTransition().
_started = true;
// Determine the next transition and tile to display.
if ((_entries == null) || (_entries.Length <= 0))
{
return;
}
TransitionEntry entry = ChooseNextTransition();
if (entry == null)
{
return;
}
Tile nextTile = entry.NextTile();
// Update the selected tile.
if (_currentSelectedTile != null)
{
_currentSelectedTile.IsSelected = false;
_currentSelectedTile = null;
}
if ((entry.Options & TransitionOptions.Select) != 0)
{
_currentSelectedTile = nextTile;
_currentSelectedTile.IsSelected = true;
}
// Update desaturation of all tiles:
// - If this transition uses desaturation, desaturate all tiles except the nextTile.
// - Otherwise, if we were using desaturation for previous transition, need to turn full
// saturation back on.
switch (entry.DesaturationMode)
{
case TransitionDesaturationMode.None:
foreach (var tile in _layoutManager.AllTiles)
{
tile.IsDesaturated = false;
_transitionLibrary.ApplyDesaturation(
tile,
TransitionDesaturationMode.None);
}
break;
case TransitionDesaturationMode.Regular:
foreach (var tile in _layoutManager.AllTiles)
{
tile.IsDesaturated = (tile != nextTile);
_transitionLibrary.ApplyDesaturation(
tile,
TransitionDesaturationMode.Regular);
}
break;
case TransitionDesaturationMode.ColorFlashlight:
if (!_isFlashlightEnabled)
{
goto case TransitionDesaturationMode.Regular;
}
foreach (var tile in _layoutManager.AllTiles)
{
tile.IsDesaturated = (tile != nextTile);
_transitionLibrary.ApplyDesaturation(
tile,
(tile == nextTile) ?
TransitionDesaturationMode.None :
TransitionDesaturationMode.ColorFlashlight);
}
break;
}
// Create the Transition and begin playing animations.
Transition transition = entry.CreateTransition(nextTile.Frame);
if (transition != null)
{
transition.TransitionFinished += Transition_TransitionFinished;
transition.PlayAllAnimations();
_currentTransition = transition;
}
}
