/// <summary>
/// Updates the view to match a new model. Updates event handlers and listeners.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void CanvasHost_DataContextChanged(object sender, DependencyPropertyChangedEventArgs e)
{
var oldDc = e.OldValue as CanvasHostViewModel;
if (oldDc != null)
{
oldDc.PropertyChanged -= ViewModelPropertyChanged;
oldDc.Cells.CollectionChanged -= DrawOutline;
oldDc.Leds.CollectionChanged -= DrawLed;
oldDc.TouchRegions.CollectionChanged -= DrawTouchRegion;
//oldDc.Frames.CollectionChanged -= DrawFrames;
}
_viewModel = e.NewValue as CanvasHostViewModel;
ClearCanvas();
if (_viewModel == null)
{
return;
}
_viewModel.PropertyChanged += ViewModelPropertyChanged;
_viewModel.Cells.CollectionChanged += DrawOutline;
_viewModel.Leds.CollectionChanged += DrawLed;
_viewModel.TouchRegions.CollectionChanged += DrawTouchRegion;
// _viewModel.Frames.CollectionChanged += DrawFrames;
UpdateImage();
}
public static ICanvasHostCommand Create(CanvasHostViewModel viewModel, CanvasHostMode mode)
{
switch (mode)
{
case CanvasHostMode.ColorFill:
return(new FindCellCommand(viewModel));
case CanvasHostMode.PlaceLED:
return(new PlaceLedCommand(viewModel));
case CanvasHostMode.CreateTouchRegion:
return(new CreateTouchRegionCommand(viewModel));
case CanvasHostMode.PlaceLEDWithoutCell:
return(new FindCellCommand(viewModel, System.Drawing.Color.FromArgb(0, 0, 0, 0))); //Transparent white
case CanvasHostMode.None:
default:
return(null);
}
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="viewModel"></param>
public CreateTouchRegionCommand(CanvasHostViewModel viewModel)
{
_viewModel = viewModel;
}
public PlaceLedCommand(CanvasHostViewModel viewModel)
{
_viewModel = viewModel;
}
public FindCellCommand(CanvasHostViewModel viewModel, System.Drawing.Color fillColor) : this(viewModel)
{
//Will fill the cell without asking for a color from the color dialog
askForColor = false;
this.fillColor = fillColor;
}
public FindCellCommand(CanvasHostViewModel viewModel)
{
_viewModel = viewModel;
}
