Method TableDrawBorders

ImGUI GLFW Tutorial/imgui/imgui_tables.cpp:2477–2570

FIXME-TABLE: This is a mess, need to redesign how we render borders (as some are also done in TableEndRow)

// FIXME-TABLE: This is a mess, need to redesign how we render borders (as some are also done in TableEndRow)
void ImGui::TableDrawBorders(ImGuiTable* table)
{
    ImGuiWindow* inner_window = table->InnerWindow;
    if (!table->OuterWindow->ClipRect.Overlaps(table->OuterRect))
        return;

    ImDrawList* inner_drawlist = inner_window->DrawList;
    table->DrawSplitter->SetCurrentChannel(inner_drawlist, TABLE_DRAW_CHANNEL_BG0);
    inner_drawlist->PushClipRect(table->Bg0ClipRectForDrawCmd.Min, table->Bg0ClipRectForDrawCmd.Max, false);

    // Draw inner border and resizing feedback
    const float border_size = TABLE_BORDER_SIZE;
    const float draw_y1 = table->InnerRect.Min.y;
    const float draw_y2_body = table->InnerRect.Max.y;
    const float draw_y2_head = table->IsUsingHeaders ? ImMin(table->InnerRect.Max.y, (table->FreezeRowsCount >= 1 ? table->InnerRect.Min.y : table->WorkRect.Min.y) + table->LastFirstRowHeight) : draw_y1;
    if (table->Flags & ImGuiTableFlags_BordersInnerV)
    {
        for (int order_n = 0; order_n < table->ColumnsCount; order_n++)
        {
            if (!(table->EnabledMaskByDisplayOrder & ((ImU64)1 << order_n)))
                continue;

            const int column_n = table->DisplayOrderToIndex[order_n];
            ImGuiTableColumn* column = &table->Columns[column_n];
            const bool is_hovered = (table->HoveredColumnBorder == column_n);
            const bool is_resized = (table->ResizedColumn == column_n) && (table->InstanceInteracted == table->InstanceCurrent);
            const bool is_resizable = (column->Flags & (ImGuiTableColumnFlags_NoResize | ImGuiTableColumnFlags_NoDirectResize_)) == 0;
            const bool is_frozen_separator = (table->FreezeColumnsCount != -1 && table->FreezeColumnsCount == order_n + 1);
            if (column->MaxX > table->InnerClipRect.Max.x && !is_resized)
                continue;

            // Decide whether right-most column is visible
            if (column->NextEnabledColumn == -1 && !is_resizable)
                if ((table->Flags & ImGuiTableFlags_SizingMask_) != ImGuiTableFlags_SizingFixedSame || (table->Flags & ImGuiTableFlags_NoHostExtendX))
                    continue;
            if (column->MaxX <= column->ClipRect.Min.x) // FIXME-TABLE FIXME-STYLE: Assume BorderSize==1, this is problematic if we want to increase the border size..
                continue;

            // Draw in outer window so right-most column won't be clipped
            // Always draw full height border when being resized/hovered, or on the delimitation of frozen column scrolling.
            ImU32 col;
            float draw_y2;
            if (is_hovered || is_resized || is_frozen_separator)
            {
                draw_y2 = draw_y2_body;
                col = is_resized ? GetColorU32(ImGuiCol_SeparatorActive) : is_hovered ? GetColorU32(ImGuiCol_SeparatorHovered) : table->BorderColorStrong;
            }
            else
            {
                draw_y2 = (table->Flags & (ImGuiTableFlags_NoBordersInBody | ImGuiTableFlags_NoBordersInBodyUntilResize)) ? draw_y2_head : draw_y2_body;
                col = (table->Flags & (ImGuiTableFlags_NoBordersInBody | ImGuiTableFlags_NoBordersInBodyUntilResize)) ? table->BorderColorStrong : table->BorderColorLight;
            }

            if (draw_y2 > draw_y1)
                inner_drawlist->AddLine(ImVec2(column->MaxX, draw_y1), ImVec2(column->MaxX, draw_y2), col, border_size);
        }
    }