Method TableDrawBorders

KBotExt/imgui/imgui_tables.cpp:2569–2663

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
	ImGuiTableInstanceData* table_instance = TableGetInstanceData(table, table->InstanceCurrent);
	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_instance->LastFirstRowHeight) : draw_y1;
	if (table->Flags & ImGuiTableFlags_BordersInnerV)
	{
		for (int order_n = 0; order_n < table->ColumnsCount; order_n++)
		{
			if (!IM_BITARRAY_TESTBIT(table->EnabledMaskByDisplayOrder, 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 == 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);
		}
	}