Method DockContextNewFrameUpdateUndocking

imgui_tiny_app/imgui/imgui.cpp:17919–17959

Docking context update function, called by NewFrame()

// Docking context update function, called by NewFrame()
void ImGui::DockContextNewFrameUpdateUndocking(ImGuiContext* ctx)
{
    ImGuiContext& g = *ctx;
    ImGuiDockContext* dc = &ctx->DockContext;
    if (!(g.IO.ConfigFlags & ImGuiConfigFlags_DockingEnable))
    {
        if (dc->Nodes.Data.Size > 0 || dc->Requests.Size > 0)
            DockContextClearNodes(ctx, 0, true);
        return;
    }

    // Setting NoSplit at runtime merges all nodes
    if (g.IO.ConfigDockingNoSplit)
        for (int n = 0; n < dc->Nodes.Data.Size; n++)
            if (ImGuiDockNode* node = (ImGuiDockNode*)dc->Nodes.Data[n].val_p)
                if (node->IsRootNode() && node->IsSplitNode())
                {
                    DockBuilderRemoveNodeChildNodes(node->ID);
                    //dc->WantFullRebuild = true;
                }

    // Process full rebuild
#if 0
    if (ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_C)))
        dc->WantFullRebuild = true;
#endif
    if (dc->WantFullRebuild)
    {
        DockContextRebuildNodes(ctx);
        dc->WantFullRebuild = false;
    }

    // Process Undocking requests (we need to process them _before_ the UpdateMouseMovingWindowNewFrame call in NewFrame)
    for (ImGuiDockRequest& req : dc->Requests)
    {
        if (req.Type == ImGuiDockRequestType_Undock && req.UndockTargetWindow)
            DockContextProcessUndockWindow(ctx, req.UndockTargetWindow);
        else if (req.Type == ImGuiDockRequestType_Undock && req.UndockTargetNode)
            DockContextProcessUndockNode(ctx, req.UndockTargetNode);
    }
}

// Docking context update function, called by NewFrame()
void ImGui::DockContextNewFrameUpdateDocking(ImGuiContext* ctx)