Method TableSetColumnWidth

KBotExt/imgui/imgui_tables.cpp:2144–2223

'width' = inner column width, without padding

// 'width' = inner column width, without padding
void ImGui::TableSetColumnWidth(int column_n, float width)
{
	ImGuiContext& g = *GImGui;
	ImGuiTable* table = g.CurrentTable;
	IM_ASSERT(table != NULL && table->IsLayoutLocked == false);
	IM_ASSERT(column_n >= 0 && column_n < table->ColumnsCount);
	ImGuiTableColumn* column_0 = &table->Columns[column_n];
	float column_0_width = width;

	// Apply constraints early
	// Compare both requested and actual given width to avoid overwriting requested width when column is stuck (minimum size, bounded)
	IM_ASSERT(table->MinColumnWidth > 0.0f);
	const float min_width = table->MinColumnWidth;
	const float max_width = ImMax(min_width, TableGetMaxColumnWidth(table, column_n));
	column_0_width = ImClamp(column_0_width, min_width, max_width);
	if (column_0->WidthGiven == column_0_width || column_0->WidthRequest == column_0_width)
		return;

	//IMGUI_DEBUG_PRINT("TableSetColumnWidth(%d, %.1f->%.1f)\n", column_0_idx, column_0->WidthGiven, column_0_width);
	ImGuiTableColumn* column_1 = (column_0->NextEnabledColumn != -1) ? &table->Columns[column_0->NextEnabledColumn] : NULL;

	// In this surprisingly not simple because of how we support mixing Fixed and multiple Stretch columns.
	// - All fixed: easy.
	// - All stretch: easy.
	// - One or more fixed + one stretch: easy.
	// - One or more fixed + more than one stretch: tricky.
	// Qt when manual resize is enabled only supports a single _trailing_ stretch column, we support more cases here.

	// When forwarding resize from Wn| to Fn+1| we need to be considerate of the _NoResize flag on Fn+1.
	// FIXME-TABLE: Find a way to rewrite all of this so interactions feel more consistent for the user.
	// Scenarios:
	// - F1 F2 F3  resize from F1| or F2|   --> ok: alter ->WidthRequested of Fixed column. Subsequent columns will be offset.
	// - F1 F2 F3  resize from F3|          --> ok: alter ->WidthRequested of Fixed column. If active, ScrollX extent can be altered.
	// - F1 F2 W3  resize from F1| or F2|   --> ok: alter ->WidthRequested of Fixed column. If active, ScrollX extent can be altered, but it doesn't make much sense as the Stretch column will always be minimal size.
	// - F1 F2 W3  resize from W3|          --> ok: no-op (disabled by Resize Rule 1)
	// - W1 W2 W3  resize from W1| or W2|   --> ok
	// - W1 W2 W3  resize from W3|          --> ok: no-op (disabled by Resize Rule 1)
	// - W1 F2 F3  resize from F3|          --> ok: no-op (disabled by Resize Rule 1)
	// - W1 F2     resize from F2|          --> ok: no-op (disabled by Resize Rule 1)
	// - W1 W2 F3  resize from W1| or W2|   --> ok
	// - W1 F2 W3  resize from W1| or F2|   --> ok
	// - F1 W2 F3  resize from W2|          --> ok
	// - F1 W3 F2  resize from W3|          --> ok
	// - W1 F2 F3  resize from W1|          --> ok: equivalent to resizing |F2. F3 will not move.
	// - W1 F2 F3  resize from F2|          --> ok
	// All resizes from a Wx columns are locking other columns.

	// Possible improvements:
	// - W1 W2 W3  resize W1|               --> to not be stuck, both W2 and W3 would stretch down. Seems possible to fix. Would be most beneficial to simplify resize of all-weighted columns.
	// - W3 F1 F2  resize W3|               --> to not be stuck past F1|, both F1 and F2 would need to stretch down, which would be lossy or ambiguous. Seems hard to fix.

	// [Resize Rule 1] Can't resize from right of right-most visible column if there is any Stretch column. Implemented in TableUpdateLayout().

	// If we have all Fixed columns OR resizing a Fixed column that doesn't come after a Stretch one, we can do an offsetting resize.
	// This is the preferred resize path
	if (column_0->Flags & ImGuiTableColumnFlags_WidthFixed)
		if (!column_1 || table->LeftMostStretchedColumn == -1 || table->Columns[table->LeftMostStretchedColumn].DisplayOrder >= column_0->DisplayOrder)
		{