Exposing the `ContentPresenter.Child` in `ItemsControl.LogicalChildren` was causing problems when detaching and reattaching an `ItemsControl` to the logical tree. Instead, expose the `ContentPresenter` itself in effect meaning that `ItemsControl` has a "container" type just like the controls derived from it.
Fixes#3487
`IImage` represents a base interface for raster and vector images. `IBitmap` now implements this interface and `DrawingContext` accepts this interface in `DrawImage`.
The interface defines a `Draw` method which introduces a level of indirection for drawing the image through the image itself.
Renamed `IDrawingContextImpl.DrawImage` to `DrawBitmap` as this only handles drawing bitmap images. `Bitmap` now calls this method directly on the platform implementation.
The root of our logical tree is denoted by `IStyleRoot` for historical reasons: before #1594, styling was defined in `Avalonia.Styling` but the logical tree was defined in `Avalonia.Controls`. The styling system needed a root but because it was lower-level than the logical tree it had to define its own root type which was then repurposed for use by the logical tree.
Since #1594 the logical tree is defined in `Avalonia.Styling` as well so we might as well call `IStyleRoot` what it is: the logical tree root.
- When detaching set `Parent` to `null` before raising the `DetachedFromLogicalTree` event
- To do this, we need to store the logical root in the control so that e.g. a child control can be detached in a `DetachedFromLogicalTree` handler
- Add `Source` and `Parent` properties to `LogicalTreeAttachmentEventArgs` to give more context on what caused the attachment/detachment
Steven Kirk
Dariusz Komosinski
Joe Clapis
Chris
Andrey Kunchev
José Pedro
Luis von der Eltz
Luis v.d.Eltz
macpawluk
Benedikt Schroeder