Use thumb for dragmove

[punker76]

• use thumb for DragMove actions (makes it possible that animations not hangs)
• double click in thumb
• DragMove with UseNoneWindowStyle
• right click on thumb
• allow DragMove with open Flyouts
• some code cleanup after Flyout implementation
• test it with Avalon dock for @QuantumDeveloper
• hopefully not a breaking change :-D

thx @ButchersBoy for the code from Dragablz

Closes #1821 Move window when flyout is open
Closes #1635 Fylout window not draggable?
Closes #2036 Avalondock Anchorables could not be dragged inside MetroWindow
Closes #2122 Use behavior/attached property to control window dragging
Closes #1849 System menu present everywhere when fullscreen is toggled on

[punker76]

@thoemmi If you have some time... the Flyout stuff is implemented and testable...

/cc @hercmaroudas @QuantumDeveloper

[thoemmi]

@punker76 Here are my annotations:

• I think the name windowRestoreThumb (and PART_WindowRestoreThumb) quite confusing. This isn't about restoring the window but moving it, is it?
• Is the first condition in MetroWindow.DoWindowMoveThumbOnDragDelta correct? If window.IsWindowDraggable is false it should always return despite the properties of dragDeltaEventArgs.
• The InvisibleThumbStyle style is declared twice, in MetroWindow.xaml and Flyout.xaml. Mabe you should move to a central place, so there's only one declaration.

[punker76]

@thoemmi

I think the name windowRestoreThumb (and PART_WindowRestoreThumb) quite confusing. This isn't about restoring the window but moving it, is it?

I was also rethinking about the name, maybe PART_WindowTitleThumb is better for this...

Is the first condition in MetroWindow.DoWindowMoveThumbOnDragDelta correct? If window.IsWindowDraggable is false it should always return despite the properties of dragDeltaEventArgs.

Yeah should be!

The InvisibleThumbStyle style is declared twice, in MetroWindow.xaml and Flyout.xaml. Mabe you should move to a central place, so there's only one declaration.

I'll do this.

thx @thoemmi

[punker76]

@thoemmi all annotations done

I also disable the thumb for bottom Flyouts. What do you think?

[thoemmi]

👍

[punker76]

😎

[ButchersBoy]

Found a bug with this on a 3 monitor setup; all of different resolutions and orientations...small PR incoming...

[alexeytcherniak]

FYI, if ShowTitleBar="False", window dragging will not work, because window content (MetroContentControl) overlays Title bar Thumb (PART_WindowTitleThumb). The problem is that the Grid row, where Thumb is placed, has Height=0 in this case, even if there are Minimize/Maximize/Close buttons visible. Thus, if ShowTitleBar="False", there is no way to move the window by dragging.