Function TreeNodeStoreStackData

src/imgui/imgui_widgets.cpp:6732–6752

Store ImGuiTreeNodeStackData for just submitted node. Currently only supports 32 level deep and we are fine with (1 << Depth) overflowing into a zero, easy to increase.

// Store ImGuiTreeNodeStackData for just submitted node.
// Currently only supports 32 level deep and we are fine with (1 << Depth) overflowing into a zero, easy to increase.
static void TreeNodeStoreStackData(ImGuiTreeNodeFlags flags, float x1)
{
    ImGuiContext& g = *GImGui;
    ImGuiWindow* window = g.CurrentWindow;

    g.TreeNodeStack.resize(g.TreeNodeStack.Size + 1);
    ImGuiTreeNodeStackData* tree_node_data = &g.TreeNodeStack.Data[g.TreeNodeStack.Size - 1];
    tree_node_data->ID = g.LastItemData.ID;
    tree_node_data->TreeFlags = flags;
    tree_node_data->ItemFlags = g.LastItemData.ItemFlags;
    tree_node_data->NavRect = g.LastItemData.NavRect;

    // Initially I tried to latch value for GetColorU32(ImGuiCol_TreeLines) but it's not a good trade-off for very large trees.
    const bool draw_lines = (flags & (ImGuiTreeNodeFlags_DrawLinesFull | ImGuiTreeNodeFlags_DrawLinesToNodes)) != 0;
    tree_node_data->DrawLinesX1 = draw_lines ? (x1 + g.FontSize * 0.5f + g.Style.FramePadding.x) : +FLT_MAX;
    tree_node_data->DrawLinesTableColumn = (draw_lines && g.CurrentTable) ? (ImGuiTableColumnIdx)g.CurrentTable->CurrentColumn : -1;
    tree_node_data->DrawLinesToNodesY2 = -FLT_MAX;
    window->DC.TreeHasStackDataDepthMask |= (1 << window->DC.TreeDepth);
    if (flags & ImGuiTreeNodeFlags_DrawLinesToNodes)
        window->DC.TreeRecordsClippedNodesY2Mask |= (1 << window->DC.TreeDepth);
}

// When using public API, currently 'id == storage_id' is always true, but we separate the values to facilitate advanced user code doing storage queries outside of UI loop.
bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* label, const char* label_end)