Dockspace popup menu

[timeinpixels]

Is there a way to create a popup menu in an empty Dockspace?
I need a quick right-click context menu with an option to add new window, but the context menu should be available only in an empty dockspace "behind" all the windows.

[ocornut]

Hello,

It took me a while to answer this question.
I pushed acf043a and 85a661d and you should be able to poll for that specific empty node hovering using imgui_internal.h now:

#include "imgui_internal.h"
[...]
ImGuiContext& g = *GImGui;
bool is_dockspace_hole_hovered = g.HoveredDockNode && g.HoveredDockNode->IsEmpty() && ImGui::DockNodeGetRootNode(g.HoveredDockNode)->ID == dockspace_id;

From there you should use OpenPopup() + BeginPopup(), probably like:

if (is_dockspace_hole_hovered && IsMouseReleased(1))
   OpenPopup(....)
if (BeginPopup(...)
{

(Note that we've been working on a change for #3291, which would eventually facilitate adding custom button in dock node that have tab bar, but not directly solving your specific case).

[timeinpixels]

Thanks! Works like a charm!

[ocornut]

Great. I'll close this for now!

[ocornut]

When I applied this change I thought it would be good if actual docking relied on g.HoveredDockNode which actually broke quite a few things. It's possible to set docking/payload filter and therefore on overlapping docking node the actual docking target is not necessarily the 'top-most' docking node. Applied a fix now while preserving g.HoveredDockNode as an available mechanism for some operations such as the one discussed above.

[timeinpixels]

Hey Omar,

Just updated to the latest version and noticed that now HoveredDockNode is gone and there's one called DebugHoveredDockNode - is the behaviour the same, or I should make it work differently now...?
Seems to be working OK.

[ocornut]

It is the same field, it was renamed as the field was only meant to be used for debugging (actual docking can't use this as there are variety of docking filters behaving dynamically).