Method TableBeginCell

src/imgui/imgui_tables.cpp:2172–2225

[Internal] Called by TableSetColumnIndex()/TableNextColumn() This is called very frequently, so we need to be mindful of unnecessary overhead. FIXME-TABLE FIXME-OPT: Could probably shortcut some things for non-active or clipped columns.

// This is called very frequently, so we need to be mindful of unnecessary overhead.
// FIXME-TABLE FIXME-OPT: Could probably shortcut some things for non-active or clipped columns.
void ImGui::TableBeginCell(ImGuiTable* table, int column_n)
{
    ImGuiContext& g = *GImGui;
    ImGuiTableColumn* column = &table->Columns[column_n];
    ImGuiWindow* window = table->InnerWindow;
    table->CurrentColumn = column_n;

    // Start position is roughly ~~ CellRect.Min + CellPadding + Indent
    float start_x = column->WorkMinX;
    if (column->Flags & ImGuiTableColumnFlags_IndentEnable)
        start_x += table->RowIndentOffsetX; // ~~ += window.DC.Indent.x - table->HostIndentX, except we locked it for the row.

    window->DC.CursorPos.x = start_x;
    window->DC.CursorPos.y = table->RowPosY1 + table->RowCellPaddingY;
    window->DC.CursorMaxPos.x = window->DC.CursorPos.x;
    window->DC.ColumnsOffset.x = start_x - window->Pos.x - window->DC.Indent.x; // FIXME-WORKRECT
    window->DC.CursorPosPrevLine.x = window->DC.CursorPos.x; // PrevLine.y is preserved. This allows users to call SameLine() to share LineSize between columns.
    window->DC.CurrLineTextBaseOffset = table->RowTextBaseline;
    window->DC.NavLayerCurrent = (ImGuiNavLayer)column->NavLayerCurrent;

    // Note how WorkRect.Max.y is only set once during layout
    window->WorkRect.Min.y = window->DC.CursorPos.y;
    window->WorkRect.Min.x = column->WorkMinX;
    window->WorkRect.Max.x = column->WorkMaxX;
    window->DC.ItemWidth = column->ItemWidth;

    window->SkipItems = column->IsSkipItems;
    if (column->IsSkipItems)
    {
        g.LastItemData.ID = 0;
        g.LastItemData.StatusFlags = 0;
    }

    // Also see TablePushColumnChannel()
    if (table->Flags & ImGuiTableFlags_NoClip)
    {
        // FIXME: if we end up drawing all borders/bg in EndTable, could remove this and just assert that channel hasn't changed.
        table->DrawSplitter->SetCurrentChannel(window->DrawList, TABLE_DRAW_CHANNEL_NOCLIP);
        //IM_ASSERT(table->DrawSplitter._Current == TABLE_DRAW_CHANNEL_NOCLIP);
    }
    else
    {
        // FIXME-TABLE: Could avoid this if draw channel is dummy channel?
        SetWindowClipRectBeforeSetChannel(window, column->ClipRect);
        table->DrawSplitter->SetCurrentChannel(window->DrawList, column->DrawChannelCurrent);
    }

    // Logging
    if (g.LogEnabled && !column->IsSkipItems)
    {
        LogRenderedText(&window->DC.CursorPos, "|");
        g.LogLinePosY = FLT_MAX;
    }
}

// [Internal] Called by TableNextRow()/TableSetColumnIndex()/TableNextColumn()
void ImGui::TableEndCell(ImGuiTable* table)