bool IEquatable <BufferedPaintTransition <TState> > .Equals(BufferedPaintTransition <TState> other)
{
return(Object.Equals(this.FromState, other.FromState) && Object.Equals(this.ToState, other.ToState));
}
void Control_Paint(object sender, PaintEventArgs e)
{
if (BufferedPaintSupported && Enabled)
{
bool stateChanged = !Object.Equals(_currentState, _newState);
IntPtr hdc = e.Graphics.GetHdc();
if (hdc != IntPtr.Zero)
{
// see if this paint was generated by a soft-fade animation
if (!Interop.BufferedPaintRenderAnimation(Control.Handle, hdc))
{
Interop.BP_ANIMATIONPARAMS animParams = new Interop.BP_ANIMATIONPARAMS();
animParams.cbSize = Marshal.SizeOf(animParams);
animParams.style = Interop.BP_ANIMATIONSTYLE.BPAS_LINEAR;
// get appropriate animation time depending on state transition (or 0 if unchanged)
animParams.dwDuration = 0;
if (stateChanged)
{
BufferedPaintTransition <TState> transition = Transitions.Where(x => Object.Equals(x.FromState, _currentState) && Object.Equals(x.ToState, _newState)).SingleOrDefault();
animParams.dwDuration = (transition != null) ? transition.Duration : DefaultDuration;
}
Rectangle rc = Control.ClientRectangle;
IntPtr hdcFrom, hdcTo;
IntPtr hbpAnimation = Interop.BeginBufferedAnimation(Control.Handle, hdc, ref rc, Interop.BP_BUFFERFORMAT.BPBF_COMPATIBLEBITMAP, IntPtr.Zero, ref animParams, out hdcFrom, out hdcTo);
if (hbpAnimation != IntPtr.Zero)
{
if (hdcFrom != IntPtr.Zero)
{
using (Graphics g = Graphics.FromHdc(hdcFrom)) {
OnPaintVisualState(new BufferedPaintEventArgs <TState>(_currentState, g));
}
}
if (hdcTo != IntPtr.Zero)
{
using (Graphics g = Graphics.FromHdc(hdcTo)) {
OnPaintVisualState(new BufferedPaintEventArgs <TState>(_newState, g));
}
}
_currentState = _newState;
Interop.EndBufferedAnimation(hbpAnimation, true);
}
else
{
OnPaintVisualState(new BufferedPaintEventArgs <TState>(_currentState, e.Graphics));
}
}
e.Graphics.ReleaseHdc(hdc);
}
}
else
{
// buffered painting not supported, just paint using the current state
_currentState = _newState;
OnPaintVisualState(new BufferedPaintEventArgs <TState>(_currentState, e.Graphics));
}
}