public void On_State_Changed(SimpleCAD_State newState)
{
if (m_bDontUpdateState)
{
return;
}
// Deep clone state.
// If you dont clone state then SetState will set existing geometry objects as SimpleCAD children geometry.
//
// Bug:
// 1. Create line and save this drawing
// 2. Restart SimpleCAD and open the drawing.
// 3. Select line and move grip point 2 times, so you will have 2 changes.
// 4. Click Undo.
// 5. Click Undo again - the drawing doesnt return in original state.
// Instead its the last state - when grip point was moved the second time.
//
// Its result of using the same line instance in SimpleCAD as in Document.States collection.
// When grip was moved changes are applied to Document.States collection.
// Correct way - make copy of State and use it as a new state. So SimpleCAD and Document.States will
// have independent copies of the same state.
SimpleCAD_State clonedState = null;
if (newState != null)
{
clonedState = Utils.DeepClone <SimpleCAD_State>(newState);
}
this.SetState(clonedState);
}
//=============================================================================
private SimpleCAD_State GetState()
{
SimpleCAD_State curentState = new SimpleCAD_State(
m_geometries,
m_OffsetVector,
GeometryToCreate,
AxesColor,
AxesThickness,
AxesLength,
AxesTextSize,
Scale);
// return copy of state
// dont return curent state, because when call method SimpleCAD._ClearAll m_geometries array will be empty in returned value
return(Utils.DeepClone <SimpleCAD_State>(curentState));
}
//=============================================================================
private bool SetState(SimpleCAD_State state)
{
_ClearAll();
bool bInvalidate = false;
if (state == null)
{
if (this.IsEnabled)
{
this.IsEnabled = false;
bInvalidate = true;
}
}
else if (!this.IsEnabled)
{
this.IsEnabled = true;
bInvalidate = true;
}
//
// call InvalidateVisual, it will call OnRender() and redraw background
if (bInvalidate)
{
InvalidateVisual();
}
if (state == null)
{
return(false);
}
m_OffsetVector = state.OffsetVector;
if (state.Geometries != null)
{
foreach (ICadGeometry geom in state.Geometries)
{
GeometryWraper gw = geom.GetGeometryWrapper() as GeometryWraper;
if (gw != null)
{
gw.Owner = this;
}
else
{
gw = new GeometryWraper(this, geom);
}
if (gw != null)
{
AddVisualChild(gw);
AddLogicalChild(gw);
m_geometries.Add(gw);
}
}
}
AxesColor = state.AxesColor;
AxesThickness = state.AxesThickness;
AxesLength = state.AxesLength;
AxesTextSize = state.AxesTextSize;
Scale = state.Scale;
GeometryToCreate = state.GeometryToCreate;
UpdatePlot();
return(true);
}
