/// <summary>
/// <see cref="PropertyMetadata.PropertyChangedCallback"/>
/// </summary>
/// <remarks>
/// This method needs to be internal to be accessable from derived classes.
/// </remarks>
internal static void OnUserMaxSizePropertyChanged(AvaloniaObject d, AvaloniaPropertyChangedEventArgs e)
{
DefinitionBase definition = (DefinitionBase)d;
if (definition.InParentLogicalTree)
{
Grid parentGrid = (Grid)definition.Parent;
parentGrid.InvalidateMeasure();
}
}
public void Calculates_Colspan_Correctly()
{
var target = new Grid
{
ColumnDefinitions = new ColumnDefinitions
{
new ColumnDefinition(GridLength.Auto),
new ColumnDefinition(new GridLength(4, GridUnitType.Pixel)),
new ColumnDefinition(GridLength.Auto),
},
RowDefinitions = new RowDefinitions
{
new RowDefinition(GridLength.Auto),
new RowDefinition(GridLength.Auto),
},
Children = new Controls
{
new Border
{
Width = 100,
Height = 25,
[Grid.ColumnSpanProperty] = 3,
},
new Border
{
Width = 150,
Height = 25,
[Grid.RowProperty] = 1,
},
new Border
{
Width = 50,
Height = 25,
[Grid.RowProperty] = 1,
[Grid.ColumnProperty] = 2,
}
},
};
target.Measure(Size.Infinity);
// Issue #25 only appears after a second measure
target.InvalidateMeasure();
target.Measure(Size.Infinity);
target.Arrange(new Rect(target.DesiredSize));
Assert.Equal(new Size(204, 50), target.Bounds.Size);
Assert.Equal(150d, target.ColumnDefinitions[0].ActualWidth);
Assert.Equal(4d, target.ColumnDefinitions[1].ActualWidth);
Assert.Equal(50d, target.ColumnDefinitions[2].ActualWidth);
Assert.Equal(new Rect(52, 0, 100, 25), target.Children[0].Bounds);
Assert.Equal(new Rect(0, 25, 150, 25), target.Children[1].Bounds);
Assert.Equal(new Rect(154, 25, 50, 25), target.Children[2].Bounds);
}
/// <summary>
/// OnLayoutUpdated handler. Validates that all participating definitions
/// have updated min size value. Forces another layout update cycle if needed.
/// </summary>
private void OnLayoutUpdated(object sender, EventArgs e)
{
double sharedMinSize = 0;
// accumulate min size of all participating definitions
for (int i = 0, count = _registry.Count; i < count; ++i)
{
sharedMinSize = Math.Max(sharedMinSize, _registry[i].MinSize);
}
bool sharedMinSizeChanged = !MathUtilities.AreClose(_minSize, sharedMinSize);
// compare accumulated min size with min sizes of the individual definitions
for (int i = 0, count = _registry.Count; i < count; ++i)
{
DefinitionBase definitionBase = _registry[i];
if (sharedMinSizeChanged || definitionBase.LayoutWasUpdated)
{
// if definition's min size is different, then need to re-measure
if (!MathUtilities.AreClose(sharedMinSize, definitionBase.MinSize))
{
Grid parentGrid = (Grid)definitionBase.Parent;
parentGrid.InvalidateMeasure();
definitionBase.UseSharedMinimum = true;
}
else
{
definitionBase.UseSharedMinimum = false;
// if measure is valid then also need to check arrange.
// Note: definitionBase.SizeCache is volatile but at this point
// it contains up-to-date final size
if (!MathUtilities.AreClose(sharedMinSize, definitionBase.SizeCache))
{
Grid parentGrid = (Grid)definitionBase.Parent;
parentGrid.InvalidateArrange();
}
}
definitionBase.LayoutWasUpdated = false;
}
}
_minSize = sharedMinSize;
_layoutUpdatedHost.LayoutUpdated -= _layoutUpdated;
_layoutUpdatedHost = null;
_broadcastInvalidation = true;
}