Method TableCalcMaxColumnWidth

include/imgui/imgui_tables.cpp:2290–2319

Maximum column content width given current layout. Use column->MinX so this value differs on a per-column basis.

// Maximum column content width given current layout. Use column->MinX so this value differs on a per-column basis.
float ImGui::TableCalcMaxColumnWidth(const ImGuiTable* table, int column_n)
{
    const ImGuiTableColumn* column = &table->Columns[column_n];
    float max_width = FLT_MAX;
    const float min_column_distance = table->MinColumnWidth + table->CellPaddingX * 2.0f + table->CellSpacingX1 + table->CellSpacingX2;
    if (table->Flags & ImGuiTableFlags_ScrollX)
    {
        // Frozen columns can't reach beyond visible width else scrolling will naturally break.
        // (we use DisplayOrder as within a set of multiple frozen column reordering is possible)
        if (column->DisplayOrder < table->FreezeColumnsRequest)
        {
            max_width = (table->InnerClipRect.Max.x - (table->FreezeColumnsRequest - column->DisplayOrder) * min_column_distance) - column->MinX;
            max_width = max_width - table->OuterPaddingX - table->CellPaddingX - table->CellSpacingX2;
        }
    }
    else if ((table->Flags & ImGuiTableFlags_NoKeepColumnsVisible) == 0)
    {
        // If horizontal scrolling if disabled, we apply a final lossless shrinking of columns in order to make
        // sure they are all visible. Because of this we also know that all of the columns will always fit in
        // table->WorkRect and therefore in table->InnerRect (because ScrollX is off)
        // FIXME-TABLE: This is solved incorrectly but also quite a difficult problem to fix as we also want ClipRect width to match.
        // See "table_width_distrib" and "table_width_keep_visible" tests
        max_width = table->WorkRect.Max.x - (table->ColumnsEnabledCount - column->IndexWithinEnabledSet - 1) * min_column_distance - column->MinX;
        //max_width -= table->CellSpacingX1;
        max_width -= table->CellSpacingX2;
        max_width -= table->CellPaddingX * 2.0f;
        max_width -= table->OuterPaddingX;
    }
    return max_width;
}

// Note this is meant to be stored in column->WidthAuto, please generally use the WidthAuto field
float ImGui::TableGetColumnWidthAuto(ImGuiTable* table, ImGuiTableColumn* column)