/// <summary>
/// Discover the preferred size of the element.
/// </summary>
/// <param name="context">Layout context.</param>
public override Size GetPreferredSize(ViewLayoutContext context)
{
Debug.Assert(context != null);
// Validate incoming reference
if (context == null)
{
throw new ArgumentNullException("context");
}
// Ensure any content children have correct composition setting
foreach (ViewBase child in this)
{
if (child is ViewDrawContent)
{
ViewDrawContent viewContent = (ViewDrawContent)child;
viewContent.DrawContentOnComposition = DrawCanvasOnComposition;
viewContent.Glowing = viewContent.DrawContentOnComposition;
}
}
// Let base class find preferred size of the children
Size preferredSize = base.GetPreferredSize(context);
// Apply space the border takes up
if (DrawTabBorder)
{
preferredSize = CommonHelper.ApplyPadding(Orientation, preferredSize, context.Renderer.RenderTabBorder.GetTabBorderDisplayPadding(context, _paletteBorder, State, Orientation, TabBorderStyle));
}
else
{
preferredSize = CommonHelper.ApplyPadding(Orientation, preferredSize, context.Renderer.RenderStandardBorder.GetBorderDisplayPadding(_paletteBorder, State, Orientation));
}
// Do we have a metric source for additional padding?
if (_paletteMetric != null)
{
// Apply padding needed outside the border of the canvas
preferredSize = CommonHelper.ApplyPadding(Orientation, preferredSize, _paletteMetric.GetMetricPadding(State, _metricPadding));
}
return(preferredSize);
}
/// <summary>
/// Perform rendering before child elements are rendered.
/// </summary>
/// <param name="context">Rendering context.</param>
/// <exception cref="ArgumentNullException"></exception>
public override void RenderBefore(RenderContext context)
{
Debug.Assert(context != null);
// Validate reference parameter
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
// Ensure we are using the correct palette
CheckPaletteState();
// Apply padding needed outside the border of the separator
Rectangle rect = CommonHelper.ApplyPadding(Orientation, ClientRectangle,
_metric.GetMetricPadding(ElementState, MetricPadding));
// Ask the renderer to perform drawing of the separator glyph
context.Renderer.RenderGlyph.DrawSeparator(context, rect, _palette.PaletteBack, _palette.PaletteBorder,
Orientation, State, ((Source == null) || Source.SeparatorCanMove));
}
/// <summary>
/// Gets a padding metric value.
/// </summary>
/// <param name="state">Palette value should be applicable to this state.</param>
/// <param name="metric">Requested metric.</param>
/// <returns>Padding value.</returns>
public Padding GetMetricPadding(PaletteState state, PaletteMetricPadding metric)
{
// Always pass onto the inheritance
return(_inherit.GetMetricPadding(state, metric));
}
/// <summary>
/// Gets a padding metric value.
/// </summary>
/// <param name="state">Palette value should be applicable to this state.</param>
/// <param name="metric">Requested metric.</param>
/// <returns>Padding value.</returns>
public override Padding GetMetricPadding(PaletteState state, PaletteMetricPadding metric)
{
IPaletteMetric inherit = GetInherit(state);
return(inherit?.GetMetricPadding(state, metric) ?? Target.GetMetricPadding(state, metric));
}
/// <summary>
/// Populate values from the base palette.
/// </summary>
/// <param name="state">Which state to populate from.</param>
/// <param name="metric">Which metric should be used for padding.</param>
public void PopulateFromBase(PaletteState state, PaletteMetricPadding metric)
{
base.PopulateFromBase(state);
Padding = _inherit.GetMetricPadding(state, metric);
}
/// <summary> /// Gets a padding metric value. /// </summary> /// <param name="state">Palette value should be applicable to this state.</param> /// <param name="metric">Requested metric.</param> /// <returns>Padding value.</returns> public Padding GetMetricPadding(PaletteState state, PaletteMetricPadding metric) => // Always pass onto the inheritance _inherit.GetMetricPadding(state, metric);