Dock target disappears when clicking another dock before mouse release and error control has no logical parent.

[cirrusone]

Some of the sample projects raise errors on Program.Main when attempting to dock in certain scenarios. One example I can replicate is on the NestedDockSample.

System.InvalidOperationException
  HResult=0x80131509
  Message=AttachedToLogicalTreeCore called for 'Document' but control has no logical parent.
  Source=<Cannot evaluate the exception source>
  StackTrace:
<Cannot evaluate the exception stack trace>

  This exception was originally thrown at this call stack:
    [External Code]
    NestedDockSample.Program.Main(string[]) in Program.cs

Program.cs:line 12

See video of NestedDockSample:

1. Dock Tool Document into centre of Inner Document 1 Content
2. Attempt to Dock Document 2 into centre of Nested tool document content - however, after clicking the required dock target is no longer visible as Document 2 is selected instead/

I see two issues here:

1/ Impossible docks should gracefully cancel rather than raise errors.
2/ Should docks only become active/selected after Mouse Up/ release? Otherwise dock target may disappear before drag can occur. Typically this only occurs when docks occupy the same parent.

[wieslawsoltes]

Don't use NestedDockSample its not finished and not fully supported functionality.

[cirrusone]

Okay. Which samples are safe to use?

I also experienced crashing in Program.Main for the sample DockCodeOnlySample

[wieslawsoltes]

Okay. Which samples are safe to use?

I also experienced crashing in Program.Main for the sample DockCodeOnlySample

DockMvvmSample

[cirrusone]

Sorry, I'm not trying to be difficult. I'm just trying to test a solid example which I can use with a new project. Sample DockMvvmSample also gives me a few issues.

1/ Unpin Tool3
2/ Drag Tool3 outside main dock as floating window
3/ Tool3 is now displayed twice as floating and original temporary unpinned position.

[cirrusone]

I have another issue with DockMvvmSample. Starting from the demo,

If I dock Tool5 then Tool6 becomes inaccessable and vice versa. It has no header or visible bottom tab to drag or right click to access the dock. I can remedy that by docking Tool5 back onto Tool6 and moving Tool6 but then Tool5 becomes stuck.

Let me know if you want a new post for this.

[wieslawsoltes]

Please don't mix issues they will get lost, check dock layout configuration it has some flags that control this behavior.

[cirrusone]

I'm not sure if it is a bug or intended behavior currently. The Tool Dock is allowed to dock as properties CanDrag and CanDrop are both true. However, in this sample GripMode = GripMode.Hidden so there is nothing to activate any docking. Should the right click context menu still work even when there is no Grip (eg at least be able to float and redock without a grip)?

[wieslawsoltes]

I'm not sure if it is a bug or intended behavior currently. The Tool Dock is allowed to dock as properties CanDrag and CanDrop are both true. However, in this sample GripMode = GripMode.Hidden so there is nothing to activate any docking. Should the right click context menu still work even when there is no Grip (eg at least be able to float and redock without a grip)?

Well right now not much control is available in this cases, we might add some more functionality but needs some research.