/// <summary/>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
if (value == null) {
throw new ArgumentNullException("value");
}
string plcString = value as string;
if (plcString.IsEmpty()) {
return base.ConvertFrom(context, culture, value);
}
try {
var plc = new Placement();
foreach (var token in _placementTokenizer(plcString)) {
var key = token.Key;
var val = token.Value;
if (key.IsEmpty() && val == "center") {
plc.Dock = DockPosition.Float;
plc.Anchor = AnchorPoint.Center;
} else if (key.IsEmpty() || key == "dock") {
plc.Dock = (DockPosition)Enum.Parse(typeof(DockPosition), val, true);
} else if (key == "anchor") {
plc.Anchor = (AnchorPoint)Enum.Parse(typeof(AnchorPoint), val, true);
} else if (key == "margin") {
plc.Margin = (Thickness)_thicknessConverter.ConvertFrom(context, culture, val);
} else if (key == "size") {
var size = (Size)_sizeConverter.ConvertFrom(context, culture, val);
plc.MinWidth = plc.MaxWidth = size.Width;
plc.MinHeight = plc.MaxHeight = size.Height;
} else if (key == "minsize") {
var size = (Size)_sizeConverter.ConvertFrom(context, culture, val);
plc.MinWidth = size.Width;
plc.MinHeight = size.Height;
} else if (key == "maxsize") {
var size = (Size)_sizeConverter.ConvertFrom(context, culture, val);
plc.MaxWidth = size.Width;
plc.MaxHeight = size.Height;
} else if (key == "height") {
plc.MinHeight = plc.MaxHeight = Double.Parse(val);
} else if (key == "minheight") {
plc.MinHeight = Double.Parse(val);
} else if (key == "maxheight") {
plc.MaxHeight = Double.Parse(val);
} else if (key == "width") {
plc.MinWidth = plc.MaxWidth = Double.Parse(val);
} else if (key == "minwidth") {
plc.MinWidth = Double.Parse(val);
} else if (key == "maxwidth") {
plc.MaxWidth = Double.Parse(val);
} else if (key == "bidi") {
plc.Bidi = (BidiPlacement)Enum.Parse(typeof(BidiPlacement), val, true);
} else if (key == "zindex") {
plc.ZIndex = Int32.Parse(val);
}
}
return plc;
} catch (Exception e) {
throw new InvalidCastException("Invalid placement string format: '{0}'.".Substitute(plcString), e);
}
}
/// <summary>Creates a frozen <see cref="Placement"/> instance from the given parameters.</summary>
public static Placement CreateFrozen(DockPosition dock, AnchorPoint anchor, Thickness margin, Size size) {
var p = new Placement { Dock = dock, Anchor = anchor, Margin = margin };
p.SetFixedSize(size);
p.Freeze();
return p;
}
/// <summary>Creates a frozen <see cref="Placement"/> instance from the given parameters.</summary>
public static Placement CreateFrozen(DockPosition dock, Thickness margin) {
var p = new Placement { Dock = dock, Margin = margin };
p.Freeze();
return p;
}
/// <summary>Creates a frozen <see cref="Placement"/> instance from the given parameters.</summary>
public static Placement CreateFrozen(DockPosition dock, AnchorPoint anchor) {
var p = new Placement { Dock = dock, Anchor = anchor };
p.Freeze();
return p;
}
/// <summary>Creates a frozen <see cref="Placement"/> instance from the given parameters.</summary>
public static Placement CreateFrozen(DockPosition dock) {
var p = new Placement { Dock = dock };
p.Freeze();
return p;
}
/// <summary>Coerces a <see cref="Placement"/> instance according to specified flow direction.</summary>
public static Placement CoerceDirection(Placement placement, FlowDirection flowDirection) {
if (placement == null || placement.Bidi == BidiPlacement.Ignore || flowDirection != FlowDirection.RightToLeft) {
return placement;
}
var changed = false;
var dock = placement.Dock;
if (dock == DockPosition.Left) {
dock = DockPosition.Right;
changed = true;
} else if (dock == DockPosition.Right) {
dock = DockPosition.Left;
changed = true;
}
var anchor = placement.Anchor;
if ((anchor & AnchorPoint.Left) != 0) {
anchor = (anchor & ~AnchorPoint.Left) | AnchorPoint.Right;
changed = true;
} else if ((anchor & AnchorPoint.Right) != 0) {
anchor = (anchor & ~AnchorPoint.Right) | AnchorPoint.Left;
changed = true;
}
var margin = placement.Margin;
if (margin.Left != margin.Right) {
margin = new Thickness(margin.Right, margin.Top, margin.Left, margin.Bottom);
changed = true;
}
if (changed) {
var placement2 = (Placement)placement.Clone();
placement2.Dock = dock;
placement2.Anchor = anchor;
placement2.Margin = margin;
placement2.Freeze();
return placement2;
} else {
return placement;
}
}