Drag and drop preview on tree nodes and itemsize on tree nodes

[volcoma]

I am using the new drag and drop stuff - they work great but I get an issue when trying to drop over a tree node target. The preview is kinda weird. It fights with the default hover effect on the treenode. Also getting the item size of the treenode seems to return the same smaller rect and not the one displayed by the default hover effect (the red one). Any ideas or is it a bug?

[ocornut]

Hello, If you synced imgui a few days ago there was a bug that affected those tooltips and can cause this flicker, it’s now fixed in master. Let me check for the outline rect.. Omar

[volcoma]

ya I updated and its not flickering. The problem is the outline rect and the itemsize of the treenode :). thx for the fast response.

[ocornut]

That rectangle correspond to the interaction hit-box for the tree node, which is this way by default to allow items to be added on the right side of the tree node.

It's a little tricky to solve at the moment, will look at it later. Also linking to #143, one of the remaining feature for drag and drop is to be able to implement full dragging of/within tree nodes, with helpers to be able to distinguish "drag between those 2 nodes" vs "drag inside this node".

In the meanwhile you can pass the ImGuiDragDropFlags_AcceptNoDrawDefaultRect flag to AcceptDragDropPayload() and it won't draw that rectangle.

Repro code to paste anywhere there is a Color widget in sight:
(please provide repro code when you submit a request of that sort)

bool open = ImGui::TreeNode("Test");
if (ImGui::BeginDragDropTarget())
{
    if (ImGui::AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_3F))
    {
    }
    ImGui::EndDragDropTarget();
}
if (open)
{
    ImGui::Text("Hello");
    ImGui::TreePop();
}

[ocornut]

It's a little tricky to solve at the moment, will look at it later.

Actually this is overlapping with some changes I wanted to make for the Navigation branch and I can store this without making internal's ItemAdd() more complex, so I'm going to fix it now.

[volcoma]

Thats great man :) thx

[ocornut]

Fixed now.

[volcoma]

Thanks great!